钛基非晶态钎料钎焊高强石墨与铜的界面特征

石墨在核工业中得到广泛应用,铜与其连接起到加强散热的作用,二者间的连接问题成为必须要解决的技术关键.采用非晶态TiZrNiCu钎料箔真空钎焊紫铜与普通高强石墨,研究了工艺参数对接头界面组织的影响.结果表明,接头室温剪切和拉伸时均断于石墨母材侧,经接头微观组织分析,认为高强度的结合界面是由于钎料与石墨反应生成了TiC薄层,钎缝主要是以固溶体为基,由金属间化合物相间其中的组织结构形成的.

Interface character of high-strength graphite and copper joints brazed with Ti-based amorphous filler metal

Graphite has been widely used in nuclear industry.Joining of graphite and copper can improve neat conduction of structure, so bonding of these two materials is a key technology needed to be solved.Copper and high-strength graphite were brazed with amorphous TiZrNiCu filler metal in vacuum circumstance, and the effect of parameters on the interface was studied.The results show that fracture occurred in graphite during tensile and shear strength test.According to the microstructure analysis, thin TiC layer generated due to the reaction of filler metal and graphite, which formed high-strength interface.Brazing seam was mainly consisted of solid solution, with intermetalic compound distributing in it.