CeO_2掺杂MAS中间层对C/C-LAS接头性能的影响

Effect of CeO_2 Modified MAS Middle Layer on the Joint of C/C-LAS

采用稀土CeO2改性镁铝硅玻璃(MAS)作为中间层,对碳/碳(C/C)复合材料和锂铝硅玻璃陶瓷(LAS)进行热压连接,研究了稀土氧化物CeO2的掺杂对连接接头性能的影响。利用扫描电子显微镜(SEM)、能谱(EDS)对稀土改性的MAS中间层、连接界面的形貌及成分进行分析,利用万能试验机测试C/C-LAS连接接头的剪切强度。研究结果表明:与未添加CeO2改性的MAS中间层相比较,改性后MAS中间层表面较致密,孔洞缺陷少,MAS中间层的厚度约为150μm,未改性MAS中间层的厚度为50μm;稀土CeO2改性后的连接接头平均剪切强度为25.37 MPa,比未改性的连接接头强度提高约为30%。

The joints between C/C composites and lithium aluminosilicate （LAS） glass ceramic were prepared by hot pressing process method using magnesium aluminosilicate glass caremic （MAS） modified by rare earth oxide （CeO2） as an intermediate layer. Morphology and ingredients of the MAS middlelayer and joints were analyzed by SEM and EDS. Shear strength of joints was examined through the 1NSTRON universal testing tensile machine. The results show that MAS middle layer surface is denser with less defects than with the middle layer without CeO2. The thickness of MAS middlelayer modified by CeO2 is about 150 pan, which of MAS middlelayer without CeO2 is about 50 un. The average shear strength of joints modified by CeO2 is 25.37 MPa, which is 30% higher than that of the joints without CeO2.