(北京有色金屬研究總院復(fù)合材料中心，北京 100088;
北京科技大學(xué)， 北京 100083)
摘 要: 利用X射線衍射微區(qū)應(yīng)力測定及剪切斷裂實驗方法研究了Si3N4/金屬釬焊 接頭中的殘余熱應(yīng)力分布， 分析和討論了殘余熱應(yīng)力對接頭斷裂形式及強度的影響。 結(jié)果表明在Si3N4/金屬釬焊接頭中由于殘余熱應(yīng)力的作用， 使斷裂常常發(fā)生在Si3N4一側(cè)。 本實驗通過選用熱膨脹系數(shù)與Si3N4相近的金屬進(jìn)行 釬焊，結(jié)果可以有效地降低接頭中的殘余熱應(yīng)力， 提高接頭強度。 另外， 釬焊界面上Cu應(yīng)力緩解層的加入也有利于使接頭中殘余熱應(yīng)力進(jìn)一步降低。
關(guān)鍵字: Si3N4 釬焊 熱應(yīng)力 接頭強度
（General Research Institute for Non-ferrous Metals, Beijing 100088, P. R. China ;
University of Science and Technology Beijing, Beijing 100083, P. R. China）
Abstract:Residual thermal stress distribution of Si3N4/metal brazing joints was studied by means of X-ray diffraction micro-region stress analysis and shearing tests. The effect of residual thermal stress on fracture form and strength of brazing joints was discussed. The results showed that fracture occurs very easily along the Si3N4 side of the brazing joints because of the concentration of residual thermal stress; when the metal whose thermal expansion coefficent is near that of Si3N4 is chosen to braze with Si3N4, the residual thermal stress can decrease and the strength will increase. A reduced internal thermal stress of brazing joints was also obtained using Cu as interlayer metal.
Key words: Si3N4 brazing residual thermal stress strength of joints
