C/C复合材料与LAS陶瓷连接的显微结构与性能

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Microstructure and Properties of Joints of Carbon/Carbon Composites and LAS Glass-Ceramic

1. Carbon-Carbon Composites Technology Research Center, Northwestern Polytechnical University, Xi'an 710072, China;
2. Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an 710072, China

摘要: 采用Y₂O₃-Al₂O₃-SiO₂-TiO₂(YAST)玻璃作为中间层,对SiC-MoSi₂表面改性的C/C复合材料与Li₂CO₃-Al₂O₃-SiO₂(LAS)陶瓷进行热压连接,所施压力为20MPa,保温时间为30min,连接温度分别为1150℃,1200℃,1250℃,1300℃。利用SEM,EDS和BEI(背散射电子像)对SiC-MoSi₂涂层,连接界面的形貌和断口进行了分析,研究结果表明,SiC-MoSi₂涂层与基体结合紧密,Si、C元素在界面处呈梯度状分布,形成厚度约为15μm的过渡层。YAST玻璃与基体润湿良好,接头的剪切强度可达26.21MPa。
- C/C复合材料 /
- LAS陶瓷 /
- 玻璃 /
- 连接
Abstract: Carbon-carbon(C/C) composites modified with the SiC-MoSi₂ coating were joined to Li₂CO₃-Al₂O₃-SiO₂(LAS) ceramic with Y₂O₃-Al₂O₃-SiO₂-TiO₂(YAST) glass as intermediate layer under joining pressure of 20MPa and holding 30min at various temperature.The effect of joining temperature,holding time and joining pressure on the share strength was studied.The microstructure of the interface were analyzed by SEM,BEI and EDS.Result shows that Si and C elements were gradient distributed in the interface and a interlayer about 15μm formed which helps the adherence of SiC-MoSi₂ coating to C/C composite.The YAST glass has favorable wettability with C/C composites and LAS ceramic and maximum shear strength of joints reaches 26.21MPa.
- Carbon-carbon composites /
- LAS ceramic /
- Glass /
- Joining