Wetting and joining of mullite ceramics by active-metal braze alloys
- Sandia National Labs., Albuquerque, NM (United States)
- Lawrence Berkeley Lab., CA (United States)
Mullite and ZrO{sub 2}-toughened mullite (ZTM) were joined with Ag-Cu eutectic braze alloys that contain Ti or Zr as active elements. Although neither the alloy compositions nor the processing conditions were optimized, four-point bends strengths of joined bars were as high as 108 MPa. Joining reactions were studied by conducting separate sessile drop experiments with molten Ti-Ag-Cu and Zr-Ag-Cu alloys on mullite for times and temperatures that were similar to those used for joining. Detailed compositional and microstructural analyses of those metal-ceramic interfaces revealed a complex reaction zone in which the oxide of the active element was a principal reaction product. Compared with the Ti-containing alloys, those with Zr were more refractory, they were less reactive with the mullite, and the Zr did not segregate as completely to the interface during heating.
- Research Organization:
- Sandia National Laboratory
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 142262
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 1 Vol. 77; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
Similar Records
Joining of alumina ceramics and nickel alloy
Bonding mechanisms in silicon nitride brazing