表面改性C/C复合材料与LAS玻璃陶瓷的连接

 采用MgOAl₂O₃SiO₂(MAS)玻璃作为中间层，对SiCMoSi₂表面改性的C/C复合材料与Li₂CO₃Al₂O₃SiO₂(LAS)玻璃陶瓷进行热压连接。通过正交实验，研究了连接温度、连接压力和保温时间对试样连接强度的影响，确定最佳工艺参数为：1 200 ℃，20 MPa，15 min，所得到连接接头的最高剪切强度可达30 MPa。利用扫描电子显微镜（SEM）、能谱仪（EDS）和背散射电子像（BEI)对SiCMoSi₂涂层、连接界面的形貌以及组成进行了分析。研究结果表明，SiCMoSi₂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15 μm的过渡层。MAS玻璃中的组分与LAS玻璃陶瓷和SiCMoSi₂涂层存在相互渗透现象，形成紧密的C/C(SiCMoSi₂)/MAS/LAS结构，界面间的结合良好。

Joining of Surface Modified Carbon/Carbon Composites and LAS Glass Ceramic

Carbon/carbon(C/C) composites modified with SiCMoSi₂ coating are joined to Li₂CO₃Al₂O₃SiO₂(LAS) glass ceramic using MgOAl₂O₃SiO₂(MAS) glass. The effects of joining temperature, joining pressure, and holding time on the shear strength of the sample are studied. The optimal technological parameters obtained by orthogonal experiments are 1 200 ℃，20 MPa, and 15 min. Under these conditions, the shear strength of the joined sample is up to 30 MPa. The microstructure of the interfaces is analyzed by scanning electron microscope(SEM),energy disperse spectroscopy(EDS), and backscattered electron image(BEI). Results show that Si and C elements distribute in a gradient in the interface, while an interlayer about of 15 μm is produced which accelerates the joining of SiCMoSi₂ coating and C/C composite. Moreover, C/C(SiCMoSi₂)/MAS/LAS interfaces are formed due to the interdiffusion that occurrs at the interfaces between the glass and SiCMoSi₂ coating and LAS glass ceramic, which contributes to the superior joining of interfaces.