表面改性C/C复合材料与LAS玻璃陶瓷的连接  

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

作　　者：林晓秋[1] 李克智[1] 李贺军[1] 兰逢涛[1] 

机构地区：[1]西北工业大学超高温结构复合材料重点实验室碳/碳复合材料工程技术研究中心,陕西西安710072

出　　处：《航空学报》2009年第2期380-384,共5页Acta Aeronautica et Astronautica Sinica

摘　　要：采用MgO-Al2O3-SiO2(MAS)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)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SiC-MoSi2涂层、连接界面的形貌以及组成进行了分析。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。MAS玻璃中的组分与LAS玻璃陶瓷和SiC-MoSi2涂层存在相互渗透现象,形成紧密的C/C(SiC-MoSi2)/MAS/LAS结构,界面间的结合良好。Carbon/carbon（C/C） composites modified with SiC-MoSi2 coating are joined to Li2 CO3- A12O3-SiO2 （LAS） glass ceramic using MgO-Al2O3-SiO2 （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 15μm is produced which accelerates the joining of SiC-MoSi2 coating and C/C composite. Moreover, C/C（SiC-MoSi2 ）/ MAS/LAS interfaces are formed due to the interdiffusion that oecurrs at the interfaces between the glass and SiC-MoSi2 coating and LAS glass ceramic, which contributes to the superior joining of interfaces.

关 键 词：C/C复合材料 LAS玻璃陶瓷 MAS玻璃 连接 剪切强度 

分 类 号：TB332[一般工业技术—材料科学与工程]