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Durable Joining of Dissimilar Materials

Lawrence Berkeley National Laboratory

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Technology Marketing SummaryOne barrier to solid oxide fuel cell manufacturing is forming robust joints between materials that don’t chemically bond with each other and/or differ greatly in form or particle size, such as metals and ceramics. Berkeley Lab scientists solve this problem by decorating the surface of the more ductile material with particles of the less ductile material via milling and then sinter-bonding this composite to the less ductile materials and/or another material that will sinter with either of the first two materials. DescriptionThis technique is especially useful in devices where the utility of the joint is derived from a sharp interface between the two materials or where a third bonding material might be incompatible with system requirements. Joints made using this method have proven more durable during rapid thermal cycling than bonds relying on mechanical interlocking of articles or fibers and are more compact than graded joints. Benefits
  • Survives rapid thermal cycling
  • Thinner than graded joint
  • Eliminates the need to introduce a third material into the joint
  • High strength over a wide range of joint porosities
  • Unlike graded joints, preserves contrast in material properties at the interface
Applications and Industries
  • Metal/ceramic joints in SOFCs
  • Thermal barrier coatings
  • Metal/ceramic bonding
Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 8,287,673
Patent
8,287,673
Joining of dissimilar materials
A method of joining dissimilar materials having different ductility, involves two principal steps: Decoration of the more ductile material's surface with particles of a less ductile material to produce a composite; and, sinter-bonding the composite produced to a joining member of a less ductile material. The joining method is suitable for joining dissimilar materials that are chemically inert towards each other (e.g., metal and ceramic), while resulting in a strong bond with a sharp interface between the two materials. The joining materials may differ greatly in form or particle size. The method is applicable to various types of materials including ceramic, metal, glass, glass-ceramic, polymer, cermet, semiconductor, etc., and the materials can be in various geometrical forms, such as powders, fibers, or bulk bodies (foil, wire, plate, etc.). Composites and devices with a decorated/sintered interface are also provided.
Lawrence Berkeley National Laboratory 10/16/2012
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
IB-2065DevelopmentAvailable06/22/201007/28/2010

Contact LBL About This Technology

To: Shanshan Li<ipo@lbl.gov>