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通过包埋工艺在C/C复合材料表面制备了改性SiC涂层。采用Ni-Ti粉末作中间层连结材料,利用真空热压扩散工艺成功制备了SiC涂层改性C/C复合材料与GH3128镍基高温合金的连接样件。借助X射线衍射仪、扫描电子显微镜、能谱分析仪和材料万能试验机,研究了SiC涂层改性C/C复合材料与GH3128镍基高温合金连接接头及其界面的元素分布、微观结构及力学性能。结果表明,在C/C复合材料表面制备SiC涂层,不仅充分改善了C/C复合材料对Ni-Ti中间层连结材料的润湿性,而且还有效缓解C/C复合材料与GH3128连接界面因热膨胀不匹配而造成的热应力。经过SiC涂层改性处理的连接接头,其室温剪切强度可达22.49MPa;而没有经过SiC涂层改性处理的连接接头,其室温剪切强度几乎为零。
The modified SiC coating was prepared on the surface of C / C composites through embedding process. Ni-Ti powder was used as the bonding material of intermediate layer, and the connection samples of SiC coating-modified C / C composites and GH3128 nickel-base superalloy were successfully prepared by vacuum hot-press diffusion process. The elemental distribution, microstructure and interface of SiC coating modified C / C composites and its interface with GH3128 nickel base superalloy were studied by means of X-ray diffraction, scanning electron microscopy, energy spectrum analyzer and universal testing machine Mechanical properties. The results show that the preparation of SiC coating on the surface of C / C composites can not only improve the wettability of C / C composites to the Ni-Ti interlayers, but also effectively alleviate the interface between C / C composites and GH3128 Thermal stress due to thermal expansion mismatch. After being modified by SiC coating, the shear strength at room temperature can reach 22.49MPa. However, the joint without SiC coating modification has nearly zero shear strength at room temperature.