Wetting and Brazing of Chromium Film-Deposited Alumina Using AgCu Filler Metal
- Harbin Institute of Technology at Weihai, Shandong Provincial Key Lab of Special Welding Technology (China)
- Harbin Institute of Technology, State Key Laboratory of Advanced Welding and Joining (China)
Wetting behavior of AgCu filler on chromium film-deposited Al{sub 2}O{sub 3} ceramics was studied by sessile drop method under vacuum, and brazing of chromium-deposited alumina using AgCu was carried out. Cr film can improve the wettability of AgCu filler on alumina ceramics, and the contact angle decreased dramatically. However, with further increase in temperature and extension of wetting time, Cr atom might diffuse excessively to molten alloy or substrate leading to thinned or disappeared Cr film on alumina; thus, the contact angle of AgCu on alumina increased. The reliable alumina joint was obtained via chromium deposition using AgCu filler brazed at 900 °C for 10 min, and no hard or brittle intermetallic compounds formed in the brazed joint. The maximum shear strength of 16.8 MPa was achieved when the thickness of deposited chromium film was 2 μm.
- OSTI ID:
- 22863272
- Journal Information:
- Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 10 Vol. 27; ISSN 1059-9495; ISSN JMEPEG
- Country of Publication:
- United States
- Language:
- English
Similar Records
Wetting of molybdenum by commercial brazing filler alloys
Improved Wetting Characteristics in TiO2–Modified Ag-CuO Air Braze Filler Metals