( 1. 北京航空航天大學 材料科學與工程學院， 北京 100083；
2. 北京科技大學 新金屬材料國家重點實驗室， 北京 100083)
摘 要: 以Ti、 Ag金屬粉末壓坯做焊料， 采用熱壓反應燒結連接工藝連接再結晶SiC陶瓷。 當焊接溫度為1030℃， 接頭抗彎強度最高達116.8MPa， 為母材強度的73.4%。 顯微分析表明： 在焊料產(chǎn)物層與SiC陶瓷母材之間形成一個反應層， 焊接溫度的變化對反應層的厚度有明顯影響；反應層主要由TiC、 Ti5Si3和Ti3SiC2組成，且Ti3SiC2緊鄰母材SiC， 而TiC則靠近焊料產(chǎn)物層一側。 SEM分析表明： 焊料產(chǎn)物層為黑白相間的復相區(qū)， 白色相主要是AgTi， 黑色相主要由Ti和AgTi3組成。
關鍵字: 陶瓷/金屬; 界面結構; 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
