感应加热辅助原位合成Ti3SiC2连接SiC陶瓷
Joining of SiC ceramics by induction heated combustion synthesis of Ti3SiC2
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摘要: 采用感应加热的方式引燃Ti-Si-C(摩尔比3∶1∶2)及Ti-Si-C-Al(摩尔比3∶1∶2∶0.1)体系的自蔓延燃烧反应并实现了SiC陶瓷间的连接. 通过对不同工艺参数下生成产物中Ti3SiC2相的相对含量的分析，初步优选出最佳工艺参数为50 A感应电流下加热、30 A感应电流下保温30 min以及1 MPa的连接压力，得到的SiC/TSC/SiC和SiC/TSC-Al/SiC接头平均抗剪强度分别为32.9和66.8 MPa. 微观结构和成分分析的结果表明，SiC/TSC/SiC及SiC/TSC-Al/SiC接头处均显示出良好的界面结合，无明显气孔或裂纹等缺陷.XRD的物相分析结果表明，SiC/TSC-Al/SiC接头的中间层产物中主要含有Ti3SiC2相及少量TiC和Ti-Si的化合物；而SiC/TSC/SiC接头则主要以TiC为主，这就导致了前者的平均抗剪强度超过了后者的两倍.Abstract: Induction heating has been utilized to ignited the Self-Propagating High-Temperature Synthesis of Ti-Si-C(3∶1∶2 molar ratio)and Ti-Si-C-Al(3∶1∶2∶0.1 molar ratio)and SiC ceramics was joined by the induction heated combustion synthesis. From the perspective of the effect of processing parameters on the relative contents of Ti3SiC2phase in the synthesized products, the optimized processing parameters were preliminarily obtained: induction heating current of 50 A，holding current of 30 A for 30 minutes and joining pressure of 1 MPa. The shear strength of SiC/TSC/SiC and SiC/TSC-Al/SiC joints obtained by the optimized processing parameters were 32.9 and 66.8 MPa, respectively. The results of microstructural and component analysis showed that no obvious pores or cracks were detected from the SiC/TSC/SiC and SiC/TSC-Al/SiC interfaces. The results from XRD analysis revealed that the synthesized products mainly consisted of Ti3SiC2, little of TiC and Ti-Si compounds in the SiC/TSC-Al/SiC joint. And the contents of TiC phase were dominant in the SiC/TSC/SiC joint, which resulted in the average shear strength of the SiC/TSC-Al/SiC joint more than twice of the SiC/TSC/SiC joint.
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