中文摘要：

采用AgCuTi钎料对2Si-B-3C-N陶瓷自身进行了真空钎焊,研究了接头典型微观形貌及工艺参数对接头组织和抗剪强度的影响.研究表明：采用AgCuTi钎料可实现2Si-B-3C-N陶瓷自身的良好连接.在900℃保温10 min条件下,接头界面反应产物为TiC、TiSi2和TiSi,且TiSi呈树枝状扎钉在TiSi2层边缘,弥散分布在接头中,对接头起到强化作用.从陶瓷侧面至钎缝中心,接头组织结构依次为2Si-B-3C-N/TiC/TiSi2/TiSi/Ag（ss）＋Cu（ss）.接头抗剪强度随着温度升高和时间增加,均呈先增大后减小趋势.在900℃保温10min条件下,接头抗剪强度最高,达到138 MPa.

英文摘要：

The vacuum brazing of 2Si-B-3C-N ceramic was carried out with AgCuTi filler metal. The microstructure of the joint andthe effect of parameters on the microstructure and shear strength were investigated. The results show that TiC, TiSi2 and TiSi areformed at the interface when brazed at 900 ℃ for 10 min. The dendritic TiSi phase pins at the boundaries of TiSi2 phase, which canimprove the strength of the joints. From the ceramic to the center of brazing seam, the joint is composed of the layers of2Si-B-3C-N/TiC/TiSi2/TiSi/Ag（ss）＋Cu（ss）. The shear strength of the joints firstly increases and then decreases with the increase oftemperature and time. The maximum shear strength of the joints is 138 MPa when brazed at 900 ℃ for 10 min.