Process for forming unusually strong joints between metals and ceramics by brazing at temperatures that do not exceed 750/sup 0/C
This invention is a process for joining metals to ceramics to form very strong bonds using low brazing temperature, i.e., less than 750/sup 0/C, and particularly for joining nodular cast iron to partially stabilized zirconia. The process provides that the ceramic be coated with an active metal, such as titanium, that can form an intermetallic with a low melting point brazing alloy such as 60Ag-30Cu-10Sn. The nodular cast iron is coated with a noncarbon containing metal, such as copper, to prevent carbon in the nodular cast iron from dissolving in the brazing alloy. These coated surfaces can be brazed together with the brazing alloy between at less than 750/sup 0/C to form a very strong joint. An even stronger bond can be formed if a transition piece is used between the metal and ceramic. It is preferred for the transition piece to have a coefficient of thermal expansion compatible with the coefficient of thermal expansion of the ceramic, such as titanium.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- Assignee:
- Dept. of Energy
- Application Number:
- ON: DE85017731
- OSTI ID:
- 5386447
- Country of Publication:
- United States
- Language:
- English
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Process for forming unusually strong joints between metals and ceramics by brazing at temperatures that do not exceed 750 degree C
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Related Subjects
BRAZED JOINTS
CERAMICS
BRAZING
IRON
METALS
ZIRCONIUM OXIDES
BRAZING ALLOYS
SURFACE COATING
ALLOYS
CHALCOGENIDES
DEPOSITION
ELEMENTS
FABRICATION
JOINING
JOINTS
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WELDED JOINTS
WELDING
ZIRCONIUM COMPOUNDS
360101* - Metals & Alloys- Preparation & Fabrication
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication