Solidliquid state pressure bonding of Si3N4 ceramics with
aluminum based alloys and its mechanism
aluminum based alloys and its mechanism
(Department of Mechanical Engineering,
Tsinghua University, Beijing 100084, P.R.China)
Tsinghua University, Beijing 100084, P.R.China)
Abstract: Solid-liquid state pressure bonding of Si3N4 ceramics with aluminum based alloys, which contain a small amount of intermetallic compounds Al3Ti or Al3Zr, was investigated. With this new method, the heat resistant properties of the bonding zone metal are improved, and the joints' strengths at high temperature is increased. The joints' shear strength at room temperature and at 600 ℃ reach 126～133 MPa and 32～34 MPa, respectively, with suitable bonding pressure. The reaction between aluminum and Si3N4 ceramics, which produces Al-Si-N-O type compounds is the dominant interfacial reaction, while the reactions between the second active element Ti or Zr in the aluminum based alloys and Si3N4 ceramics also occur to some extend.
Key words: solid-liquid state pressure bonding; Si3N4 ceramics; intermetallic compounds; high temperature properties