Abstract: -Si-Al-O-N glass was used to bond and wet dense Si₃N₄ ceramic at 1450℃ and 16000℃ for30 min, respectively. The result showed that the oxynitride glass can wet well to Si₃N₄ ceramic.At 14500℃, there was obvious difference in the coefficients of thermal expansion of the glass andSi₃N₄, while at 16000℃, the difference decreased. A diffusion layer existed near the joint. Theoxynitride glass can be used to join Si₃N₄ ceramics.

Key words: oxynitride glass, joining, wettability, thermal expansion coefficient