【摘要】 采用座滴法研究了Ni-Ti粉末在SiC陶瓷界面的润湿行为,结果显示,Ti含量增加、温度升高、保温时间延长,Ni-Ti/SiC陶瓷系统润湿性均得到改善。界面区域的SEM、EDS、XRD分析表明,活性元素Ti在界面富集形成富Ti化合物区域,可能生成的产物相有TiSi2、Ti5Si3、TiC、Ti2Ni和Ni3C,产物类型与金属粉料原始组分及润湿条件有关。当Ti含量为Ni-Ti粉末焊料的50%(质量分数)时,其产物为以TiC、Ti2Ni为主含少量Ni3C的混合物,借助于Ti2Ni的液相传质和TiC与SiC陶瓷良好的晶格匹配关系可以实现界面的良好润湿。更多还原

【Abstract】 By using the sessile drop method,the wetting behavior between Ni-Ti powders and SiC ceramic was studied,which showed that the wettability of the system was improved by increasing the Ti content,the wetting temperature and the dwelling time.The microstructures of welded area and interfacial reaction products were examined by SEM,EDS and XRD.The results showed that Ti-rich compound layer was in the interface of this wetting system.The types of the resultants at the interface depend on the composition of the original metallic powders and the technological parameters of the test,which were likely to be TiSi₂、Ti₅Si₃、TiC、Ti₂Ni and Ni₃C.When the content of Ti was 50%,the reaction products mainly consisted of TiC and Ti₂Ni,also included Ni₃C at low content.A successful wetting of Ni-Ti/SiC system was realized by the liquid transmitter of Ti₂Ni and the match of crystal lattice in TiC and SiC.更多还原