碳纳米管增强TiNi复合钎料的制备与表征

针对CNTs增强TiNi复合钎料制备中存在CNTs的均匀分散性差、结构完整性差、碳基团与基体易反应而导致基体材料污染等问题,采用PECVD方法低温原位在Ni-TiH₂基体上制备CNTs/TiNi复合钎料,采用XRD,SEM,Raman,TEM等对制备的复合钎料进行表征与分析.结果表明,该方法不仅保证了复合钎料中CNTs的结构完美和均匀分散性,而且保证了TiH₂不会因温度过高分解,避免了复合钎料体系中钛与碳之间反应,真正意义上实现了CNTs对TiNi复合钎料的强化.通过复合钎料中CNTs的增强效果,缓解钎焊接头的残余应力,提高钎焊接头的力学、热学及高温性能,可实现陶瓷、复合材料与金属复合构件的可靠连接及高温使用.

Synthesis and characterization of carbon nanotubes reinforced TiNi composite solder

Low temperature PECVD method was employed for in-situ preparation of CNTs reinforced TiNi composite brazing powder on Ni-TiH2 base material,in order to solve the problems such as poor dispersity of CNTs,poor structural integrity and reaction of C and Ti. The composite brazing powder was characterized by XRD,SEM,Raman and TEM. Analysis shows that the low temperature PECVD method has not only guaranteed the structural integrity and uniform dispersity of CNTs,but also inhibited the decomposition of TiH2 at high temperatures and further inhibited the reaction between C and Ti,which realized the reinforcement of CNTs to TiNi brazing powder. The reinforcement of CNTs could release the residual stress in brazed joints, improve the properties of the joints and further achieve the reliable joining and high-temperature application of ceramic,composites and metal.