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