界面结构对C/C复合材料与CuCrZr合金钎焊接头性能的影响

Effect of joining interfacial structure on the mechanical properties of brazed C/C composites-CuCrZr joints

以Cu-3.5Si钎料活性钎焊法制备了C/C-CuCrZr接头,采用铜为中间层,通过对"C"焊接面进行激光毛化处理构建"指接结构"连接界面,考察了界面结构和中间层厚度对接头力学性能和抗热震性能影响。结果表明,采用铜中间层和"指接结构"连接界面表现出明显的增强增韧作用。接头强度达到79 MPa,450℃,50次热震后接头界面基本完整,抗热震性能优异。铜中间层有效缓解接头残余应力,指接结构在钎焊界面形成的钎料针起到了显著的钉扎作用,同时也增大了接头连接面积,提高了接头强度和抗热震性能。

C/C composites-CuCrZr joints were obtained by a simple active brazing process with Cu-3. 5 Si brazing filler metal and pure copper interlayer. And a micro-machined technique by means of laser was applied on C/C surface,resulting in a zig-zag interfacial structure between C/C and brazed seam. The results showed that the use of copper interlayer exhibits a significant effect on mechanical strength and thermal shock resistance of the C/C composites-CuCrZr brazed joint. Moreover,joint with zig-zag interfacial structure can further improve the mechanical properties of joint.