( 1. 北京航空航天大学 材料科学与工程学院, 北京 100083;
2. 北京科技大学 新金属材料国家重点实验室, 北京 100083)
摘 要: 以Ti、 Ag金属粉末压坯做焊料, 采用热压反应烧结连接工艺连接再结晶SiC陶瓷。 当焊接温度为1030℃, 接头抗弯强度最高达116.8MPa, 为母材强度的73.4%。 显微分析表明: 在焊料产物层与SiC陶瓷母材之间形成一个反应层, 焊接温度的变化对反应层的厚度有明显影响;反应层主要由TiC、 Ti5Si3和Ti3SiC2组成,且Ti3SiC2紧邻母材SiC, 而TiC则靠近焊料产物层一侧。 SEM分析表明: 焊料产物层为黑白相间的复相区, 白色相主要是AgTi, 黑色相主要由Ti和AgTi3组成。
关键字: 陶瓷/金属; 界面结构; SiC陶瓷
hot-pressing joining process
with Ti and Ag
( 1. School of Materials Science and Engineering,
Beijing Aeronautics and Astronautics University,
Beijing 100083, China;
2. State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing, Beijing 100083, China)
Abstract: The joining of recrystallized SiC ceramics was achieved by hot pressing reaction welding using particulate filler composed of Ti/Ag/Ti. When the welding temperature was 1030℃, the maximum bending strength was obtained to be 116.8MPa, equal to 73.4% of the strength of the SiC ceramic matrix. SEM studies reveal that a reaction layer forms between the filler layer and the SiC ceramic, the thickness of the reaction layer is remarkably affected by the welding temperature. The results of EDX and XRD analyses indicate that the reaction layer is mainly composed of TiC, Ti5Si3 and Ti3SiC2, among which Ti3SiC2 is neighbouring with the SiC ceramic, and TiC is neighbouring with the filler layer. The filler layer consists of a white phase accompanied by a black phase. The white phase is mainly composed of AgTi, and the black phase includes Ti and AgTi3.
Key words: ceramic/metal; interfacial structure; SiC ceramic