US20090220813A1 - Braze alloy containing particulate material - Google Patents
Braze alloy containing particulate material Download PDFInfo
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- US20090220813A1 US20090220813A1 US12/386,120 US38612009A US2009220813A1 US 20090220813 A1 US20090220813 A1 US 20090220813A1 US 38612009 A US38612009 A US 38612009A US 2009220813 A1 US2009220813 A1 US 2009220813A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0244—Powders, particles or spheres; Preforms made therefrom
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
- C04B37/003—Joining burned ceramic articles with other burned ceramic articles or other articles by heating by means of an interlayer consisting of a combination of materials selected from glass, or ceramic material with metals, metal oxides or metal salts
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
- C04B37/003—Joining burned ceramic articles with other burned ceramic articles or other articles by heating by means of an interlayer consisting of a combination of materials selected from glass, or ceramic material with metals, metal oxides or metal salts
- C04B37/006—Joining burned ceramic articles with other burned ceramic articles or other articles by heating by means of an interlayer consisting of a combination of materials selected from glass, or ceramic material with metals, metal oxides or metal salts consisting of metals or metal salts
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
- C04B37/02—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles
- C04B37/023—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
- C04B37/02—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles
- C04B37/023—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used
- C04B37/026—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used consisting of metals or metal salts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/028—Sealing means characterised by their material
- H01M8/0282—Inorganic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0244—Powders, particles or spheres; Preforms made therefrom
- B23K35/025—Pastes, creams, slurries
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
- C04B2237/12—Metallic interlayers
- C04B2237/125—Metallic interlayers based on noble metals, e.g. silver
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
- C04B2237/70—Forming laminates or joined articles comprising layers of a specific, unusual thickness
- C04B2237/708—Forming laminates or joined articles comprising layers of a specific, unusual thickness of one or more of the interlayers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
- H01M2008/1293—Fuel cells with solid oxide electrolytes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12014—All metal or with adjacent metals having metal particles
- Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
- Y10T428/12049—Nonmetal component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/252—Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
Definitions
- the present invention relates to alloys for joining metal materials by brazing; more particularly, to silver-containing braze alloys for joining ceramics to metals; and most particularly, to silver braze alloys containing non-fusible particles to control joint thickness during fusing of the alloy.
- Fuel cells which generate electric current by controllably combining elemental hydrogen and oxygen are well known.
- an anodic layer and a cathodic layer are separated by a permeable electrolyte formed of a ceramic solid oxide, such as yttrium-stabilized zirconium (YSZ).
- YSZ yttrium-stabilized zirconium
- SOFC solid oxide fuel cell
- a single cell is capable of generating a relatively small voltage and wattage, typically between about 0.5 volt and about 1.0 volt, depending upon load, and less than about 2 watts per cm 2 of cell surface. Therefore, in practice it is known to stack together, in electrical series, a plurality of cells.
- each ceramic-based fuel cell is bonded to a surrounding metal “cassette” frame to form a fuel cell sub-assembly, using a silver/copper-based braze.
- the copper is rapidly oxidized to form copper oxide which separates from the alloy, leaving essentially pure silver as the brazing material.
- the copper oxide migrates to the boundaries of the liquid and adheres to the ceramic and the metal, providing an attachment layer for the silver.
- Exemplary silver/copper and silver/vanadium braze alloys are disclosed in International Publication No. WO 03/059843, published 24 Jul. 2003, which is incorporated herein by reference.
- a problem in the use of such alloys is that the liquidus range of the alloy is very small, such that the alloy tends immediately to become very runny upon melting and is easily squeezed out of a mechanical joint, leaving a weak bond which is easily fractured. This is known in the art of bonding as a “dry joint.” Further, the alloy displaced from the joint can flow onto adjacent areas of the apparatus being brazed, such as a fuel cell assembly, which can lead to electrical shorts during later attempted use of the apparatus. In addition, if the joint gap is too large due to insufficient loading or an out-of-flatness condition of the mating parts, the braze alloy will not fill the gap.
- a known approach to the problem of retaining liquid braze in a joint is to provide one or both of the surfaces to be brazed with shallow dimples such that the local joint thickness at each dimple will be increased.
- This approach is less than satisfactory in some applications, in that the braze layer is thickened only in the regions of the dimples, rather than over the entire joint, and in that it may be undesirable or impossible to provide the required dimples on some surfaces to be brazed.
- What is needed in the art is a means for maintaining a minimum joint thickness of a brazing alloy when brazing mating planar surfaces, and for reducing the tendency of the liquefied alloy to be squeezed from such a joint.
- a minimum joint thickness can be assured, and liquid braze can be discouraged from running out of a joint, by incorporating into the braze material beads or particulates having a diameter corresponding to the minimum joint thickness desired and which are infusible at the brazing temperature.
- a desirable braze joint thickness is in the range of about 30 ⁇ m to about 50 ⁇ m.
- the infusible particles in that size range are incorporated into the braze alloy, the joint thickness is assured.
- such particles are formed of high-melting metals, metal oxides, ceramics, or cermets.
- the particles are mixed into an alloy paste prior to fusing.
- the particle-containing paste is mixed with a non-flux carrier to facilitate application to the surfaces to be brazed.
- exemplary application methods may include painting, rolling, screening, or extrusion dispensing.
- Brazing alloys in accordance with the invention are useful in bonding ceramics to ceramics, ceramics to metals, and metals to metals.
- FIG. 1 is a cross-sectional view of a portion of a fuel cell, showing bonding of a ceramic component to a metal component by a braze alloy incorporating particulates in accordance with the invention.
- a ceramic-based fuel cell element 18 is bonded to a metal cassette 20 by a braze seal formed of a braze alloy 22 in accordance with the invention.
- the braze alloy comprises silver and includes either copper or vanadium which is readily oxidized to form CuO or V 2 O 5 during fusion of the alloy in an oxidizing atmosphere.
- the oxides separate from the alloy in known fashion and provide an adhesion layer 24 on element 18 and cassette 20 for attachment of the remaining alloy 26 .
- Braze alloy 22 includes a plurality of particles typified by particle 50 , the particles being distributed throughout the alloy matrix 22 ′ and having a general diameter 52 equal to the desired thickness of the braze seal.
- Particles 50 thus act as shims or spacers to assure a desired seal thickness by limiting the degree to which molten braze may be extruded from the seal space.
- particle 50 may be irregular in shape, as shown, and may have a shorter diameter 54 which if oriented across the seal between elements 18 and 20 can result in a thinner seal; however, particles 50 preferably are selected such that, even if they are irregular and not preferentially orientable, the shortest diameter 54 will still provide a desired minimum thickness or seal.
- particles 50 may be provided as spherical beads (not shown), having a constant diameter equal to the desired seal thickness.
- Particles or beads 50 may be formed in known fashion from metals, metal alloys, ceramics, and cermets, provided that the melting point of the material is sufficiently high that the particles are not fusible in the brazing range of temperatures.
- the melt temperature of the particles should be at least 50° C. higher than the brazing temperature range.
- the melt temperature of the particles should preferable be above 1050° C.
- Such particulated alloys in accordance with the invention are especially useful in brazing metal and ceramic components of a solid-oxide fuel cell assembly.
- particulated alloys For application to surfaces to be brazed, particulated alloys may be formed by mixing alloy powder or paste with an amount of the particulate material which has been previously comminuted and sorted to provide only particles in the desired size range or smaller.
- the particulate/alloy mixture may then be mixed with an evanescent non-flux carrier (not shown), for example, Ferro A149-19-15, available from Ferro Corp., Cleveland, Ohio, USA, to form a particulated slurry which is readily applied by known methods, for example, brushing, rolling, spraying, screening, or extrusion dispensing.
- a brazed joint is formed by:
Abstract
A minimum joint thickness can be assured by incorporating beads or particles having a diameter corresponding to the joint thickness desired and which are infusible at the brazing temperature. Preferably such particles are formed of high-melting metals, metal oxides, ceramics, or cermets and are mixed into the alloy paste prior to fusing. In a preferred embodiment, the particle-containing paste is mixed with a non-flux carrier to facilitate application to the elements to be brazed. Exemplary application methods may include painting, rolling, screening, or extrusion dispensing. Brazing alloys in accordance with the invention are useful in bonding ceramics to ceramics, ceramics to metals, and metals to metals.
Description
- This is a continuation application of U.S. patent application Ser. No. 11/638,192, filed Dec. 13, 2006, which is a divisional of U.S. patent application Ser. No. 10/892,591, filed Jul. 15, 2004, that issued as U.S. Pat. No. 7,179,558.
- The present invention was supported in part by a U.S. Government Contract, Number DE-FC26-02NG41246. The United States Government may have rights in the present invention.
- The present invention relates to alloys for joining metal materials by brazing; more particularly, to silver-containing braze alloys for joining ceramics to metals; and most particularly, to silver braze alloys containing non-fusible particles to control joint thickness during fusing of the alloy.
- Fuel cells which generate electric current by controllably combining elemental hydrogen and oxygen are well known. In one form of such a fuel cell, an anodic layer and a cathodic layer are separated by a permeable electrolyte formed of a ceramic solid oxide, such as yttrium-stabilized zirconium (YSZ). Such a fuel cell is known in the art as a “solid oxide fuel cell” (SOFC). A single cell is capable of generating a relatively small voltage and wattage, typically between about 0.5 volt and about 1.0 volt, depending upon load, and less than about 2 watts per cm2 of cell surface. Therefore, in practice it is known to stack together, in electrical series, a plurality of cells.
- In a currently-preferred arrangement, each ceramic-based fuel cell is bonded to a surrounding metal “cassette” frame to form a fuel cell sub-assembly, using a silver/copper-based braze. As the solid braze alloy is liquefied, the copper is rapidly oxidized to form copper oxide which separates from the alloy, leaving essentially pure silver as the brazing material. The copper oxide migrates to the boundaries of the liquid and adheres to the ceramic and the metal, providing an attachment layer for the silver. Exemplary silver/copper and silver/vanadium braze alloys are disclosed in International Publication No. WO 03/059843, published 24 Jul. 2003, which is incorporated herein by reference.
- A problem in the use of such alloys is that the liquidus range of the alloy is very small, such that the alloy tends immediately to become very runny upon melting and is easily squeezed out of a mechanical joint, leaving a weak bond which is easily fractured. This is known in the art of bonding as a “dry joint.” Further, the alloy displaced from the joint can flow onto adjacent areas of the apparatus being brazed, such as a fuel cell assembly, which can lead to electrical shorts during later attempted use of the apparatus. In addition, if the joint gap is too large due to insufficient loading or an out-of-flatness condition of the mating parts, the braze alloy will not fill the gap.
- A known approach to the problem of retaining liquid braze in a joint is to provide one or both of the surfaces to be brazed with shallow dimples such that the local joint thickness at each dimple will be increased. This approach is less than satisfactory in some applications, in that the braze layer is thickened only in the regions of the dimples, rather than over the entire joint, and in that it may be undesirable or impossible to provide the required dimples on some surfaces to be brazed.
- What is needed in the art is a means for maintaining a minimum joint thickness of a brazing alloy when brazing mating planar surfaces, and for reducing the tendency of the liquefied alloy to be squeezed from such a joint.
- It is a principal object of the present invention to maintain a minimum joint thickness of a brazing alloy, to reduce the tendency of the liquefied alloy to flow from a joint, and to allow an additional load to be applied to the joint to maintain a minimum gap and/or to flatten the adjoining parts without causing a dry joint.
- Briefly described, a minimum joint thickness can be assured, and liquid braze can be discouraged from running out of a joint, by incorporating into the braze material beads or particulates having a diameter corresponding to the minimum joint thickness desired and which are infusible at the brazing temperature. For example, in brazing SOFC fuel cell components, a desirable braze joint thickness is in the range of about 30 μm to about 50 μm. When infusible particles in that size range are incorporated into the braze alloy, the joint thickness is assured. Preferably such particles are formed of high-melting metals, metal oxides, ceramics, or cermets. Preferably, the particles are mixed into an alloy paste prior to fusing. In a preferred embodiment, the particle-containing paste is mixed with a non-flux carrier to facilitate application to the surfaces to be brazed. Exemplary application methods may include painting, rolling, screening, or extrusion dispensing. Brazing alloys in accordance with the invention are useful in bonding ceramics to ceramics, ceramics to metals, and metals to metals.
- The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
-
FIG. 1 is a cross-sectional view of a portion of a fuel cell, showing bonding of a ceramic component to a metal component by a braze alloy incorporating particulates in accordance with the invention. - Referring to
FIG. 1 in a solid-oxidefuel cell assembly 16, a ceramic-basedfuel cell element 18 is bonded to ametal cassette 20 by a braze seal formed of abraze alloy 22 in accordance with the invention. Preferably, the braze alloy comprises silver and includes either copper or vanadium which is readily oxidized to form CuO or V2O5 during fusion of the alloy in an oxidizing atmosphere. The oxides separate from the alloy in known fashion and provide anadhesion layer 24 onelement 18 andcassette 20 for attachment of theremaining alloy 26. -
Braze alloy 22 includes a plurality of particles typified byparticle 50, the particles being distributed throughout thealloy matrix 22′ and having ageneral diameter 52 equal to the desired thickness of the braze seal.Particles 50 thus act as shims or spacers to assure a desired seal thickness by limiting the degree to which molten braze may be extruded from the seal space. Of course,particle 50 may be irregular in shape, as shown, and may have ashorter diameter 54 which if oriented across the seal betweenelements particles 50 preferably are selected such that, even if they are irregular and not preferentially orientable, theshortest diameter 54 will still provide a desired minimum thickness or seal. Of course,particles 50 may be provided as spherical beads (not shown), having a constant diameter equal to the desired seal thickness. - Particles or
beads 50 may be formed in known fashion from metals, metal alloys, ceramics, and cermets, provided that the melting point of the material is sufficiently high that the particles are not fusible in the brazing range of temperatures. The melt temperature of the particles should be at least 50° C. higher than the brazing temperature range. For silver braze alloys, the melt temperature of the particles should preferable be above 1050° C. Such particulated alloys in accordance with the invention are especially useful in brazing metal and ceramic components of a solid-oxide fuel cell assembly. - For application to surfaces to be brazed, particulated alloys may be formed by mixing alloy powder or paste with an amount of the particulate material which has been previously comminuted and sorted to provide only particles in the desired size range or smaller. The particulate/alloy mixture may then be mixed with an evanescent non-flux carrier (not shown), for example, Ferro A149-19-15, available from Ferro Corp., Cleveland, Ohio, USA, to form a particulated slurry which is readily applied by known methods, for example, brushing, rolling, spraying, screening, or extrusion dispensing.
- Preferably, a brazed joint is formed by:
- a) applying a particulated slurry in accordance with the invention to one or both of the surfaces to be brazed;
- b) engaging, under clamping pressure, the surfaces to be brazed; and
- c) heating the clamped assembly above the braze alloy liquidus temperature to fuse the fusible metal, drive off the evanescent carrier, and collapse the joint until further collapse is prevented by the infusible particulates contained in the particulated braze alloy. The included particles can allow a higher clamping load to flatten adjoining parts to form a minimum gap providing an optimal joint thickness throughout the joint.
- While the invention has been described by reference to various specific embodiments, it should be understood that numerous changes may be made within the spirit and scope of the inventive concepts described. Accordingly, it is intended that the invention not be limited to the described embodiments, but will have full scope defined by the language of the following claims.
Claims (19)
1. A brazed joint comprising:
a) a first element having a first surface;
b) a second element having a second surface; and
c) a braze seal disposed between said first and second surfaces, said seal being formed of a particulated braze alloy and an evanescent non-flux carrier, wherein said seal has a predetermined thickness corresponding to a size of particulates in said particulated braze alloy, and wherein an initial thickness of said particulated braze alloy between said first and second surfaces is greater than said predetermined thickness of said seal.
2. A joint in accordance with claim 1 wherein said first element is formed of a metal and said second element is formed of a ceramic.
3. A joint in accordance with claim 1 wherein said size is a diameter of said particulates.
4. A joint in accordance with claim 1 wherein a shape of said particulates is selected from the group consisting of irregular and spherical.
5. A joint in accordance with claim 1 wherein said particulates are selected from the group consisting of metals, metal alloys, ceramics, and cermets.
6. A joint in accordance with claim 1 wherein said particulated braze alloy includes silver.
7. A joint in accordance with claim 1 wherein said particulated braze alloy includes an element selected from the group consisting of copper and vanadium.
8. A joint in accordance with claim 1 wherein said size of said particulates is between about 30 μm and about 50 μm
9. A joint in accordance with claim 1 wherein said particulated braze alloy includes at least one metal fusible within a temperature range, wherein said particulates are infusible within said temperature range.
10. A joint in accordance with claim 1 wherein said temperature range is between about 900° C. and about 1000° C.
11. A method of forming a brazed joint comprising:
providing a first element having a first surface;
providing a second element having a second surface;
providing a particulated slurry including a particulated braze alloy and an evanescent non-flux carrier, said particulated braze alloy including a fusible metal and infusible particulates;
applying said particulated slurry to at least one of said first and second surfaces;
disposing said particulated slurry between said first and second surfaces;
applying a clamping pressure to said first and second surfaces to form a clamped assembly;
heating said clamped assembly above a liquidus temperature of said particulated braze alloy to fuse said fusible metal, drive off said evanescent non-flux carrier, and collapse said braze joint until further collapse is prevented by said infusible particulates contained in said particulated braze alloy.
12. A method in accordance with claim 11 wherein said particulated slurry is applied to at least one of said first and second surfaces by at least one of brushing, painting, rolling, spraying, screening, or extrusion dispensing.
13. A method in accordance with claim 11 wherein said first element is formed of a metal and said second element is formed of a ceramic.
14. A method in accordance with claim 11 wherein a shape of said infusible particulates is selected from the group consisting of irregular and spherical.
15. A method in accordance with claim 11 wherein said infusible particulates are selected from the group consisting of metals, metal alloys, ceramics, and cermets.
16. A method in accordance with claim 11 wherein said particulated braze alloy includes silver.
17. A method in accordance with claim 11 wherein said particulated braze alloy includes an element selected from the group consisting of copper and vanadium.
18. A method in accordance with claim 11 wherein a size of said infusible particulates is between about 30 μm and about 50 μm
19. A method in accordance with claim 11 wherein said fusible metal is fusible within a temperature range between about 900° C. and about 1000° C., wherein said infusible particulates are infusible within said temperature range.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/386,120 US20090220813A1 (en) | 2004-07-15 | 2009-04-14 | Braze alloy containing particulate material |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/892,591 US7179558B2 (en) | 2004-07-15 | 2004-07-15 | Braze alloy containing particulate material |
US11/638,192 US20070089563A1 (en) | 2004-07-15 | 2006-12-13 | Braze alloy containing particulate material |
US12/386,120 US20090220813A1 (en) | 2004-07-15 | 2009-04-14 | Braze alloy containing particulate material |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/638,192 Continuation US20070089563A1 (en) | 2004-07-15 | 2006-12-13 | Braze alloy containing particulate material |
Publications (1)
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US20090220813A1 true US20090220813A1 (en) | 2009-09-03 |
Family
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Family Applications (3)
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US10/892,591 Active 2024-11-04 US7179558B2 (en) | 2004-07-15 | 2004-07-15 | Braze alloy containing particulate material |
US11/638,192 Abandoned US20070089563A1 (en) | 2004-07-15 | 2006-12-13 | Braze alloy containing particulate material |
US12/386,120 Abandoned US20090220813A1 (en) | 2004-07-15 | 2009-04-14 | Braze alloy containing particulate material |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
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US10/892,591 Active 2024-11-04 US7179558B2 (en) | 2004-07-15 | 2004-07-15 | Braze alloy containing particulate material |
US11/638,192 Abandoned US20070089563A1 (en) | 2004-07-15 | 2006-12-13 | Braze alloy containing particulate material |
Country Status (4)
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US (3) | US7179558B2 (en) |
EP (1) | EP1616657B1 (en) |
AT (1) | ATE460249T1 (en) |
DE (1) | DE602005019812D1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8641845B2 (en) | 2011-01-13 | 2014-02-04 | Siemens Energy, Inc. | Method of determining bond coverage in a joint |
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US8168347B2 (en) * | 2004-12-30 | 2012-05-01 | Delphi Technologies Inc. | SOFC assembly joint spacing |
US20080217382A1 (en) * | 2007-03-07 | 2008-09-11 | Battelle Memorial Institute | Metal-ceramic composite air braze with ceramic particulate |
GB0709343D0 (en) * | 2007-05-15 | 2007-06-27 | Ceravision Ltd | Electrodeless bulb |
US7691488B2 (en) * | 2007-06-11 | 2010-04-06 | Battelle Memorial Institute | Diffusion barriers in modified air brazes |
JP2009285702A (en) * | 2008-05-30 | 2009-12-10 | Denso Corp | Brazing filler metal, brazing filler metal paste, and heat exchanger |
US7855030B2 (en) | 2009-05-01 | 2010-12-21 | Delphi Technologies, Inc. | Inhibitor for prevention of braze migration in solid oxide fuel cells |
FR2946043B1 (en) | 2009-05-27 | 2011-06-24 | Centre Nat Rech Scient | AUTOMATICIZING VITREOUS COMPOSITION, PREPARATION METHOD AND USES. |
US8646677B2 (en) | 2009-11-23 | 2014-02-11 | Hamilton Sundstrand Space Systems International, Inc. | Method of joining graphite fibers to a substrate |
US20110123823A1 (en) * | 2009-11-23 | 2011-05-26 | Hamilton Sundstrand Corporation | Method of joining graphite fibers to a substrate |
JP2012028513A (en) * | 2010-07-22 | 2012-02-09 | Elpida Memory Inc | Semiconductor device and manufacturing method of the same |
US9356300B2 (en) | 2013-09-25 | 2016-05-31 | Delphi Technologies, Inc. | Fuel cell electrode interconnect contact material encapsulation and method |
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2004
- 2004-07-15 US US10/892,591 patent/US7179558B2/en active Active
-
2005
- 2005-06-29 AT AT05076497T patent/ATE460249T1/en not_active IP Right Cessation
- 2005-06-29 EP EP20050076497 patent/EP1616657B1/en not_active Not-in-force
- 2005-06-29 DE DE200560019812 patent/DE602005019812D1/en active Active
-
2006
- 2006-12-13 US US11/638,192 patent/US20070089563A1/en not_active Abandoned
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US20040115503A1 (en) * | 2002-04-24 | 2004-06-17 | The Regents Of The University Of California | Planar electrochemical device assembly |
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US8641845B2 (en) | 2011-01-13 | 2014-02-04 | Siemens Energy, Inc. | Method of determining bond coverage in a joint |
Also Published As
Publication number | Publication date |
---|---|
EP1616657B1 (en) | 2010-03-10 |
US20060014055A1 (en) | 2006-01-19 |
US20070089563A1 (en) | 2007-04-26 |
DE602005019812D1 (en) | 2010-04-22 |
EP1616657A1 (en) | 2006-01-18 |
US7179558B2 (en) | 2007-02-20 |
ATE460249T1 (en) | 2010-03-15 |
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