航空学报 > 2009, Vol. 30 Issue (2): 380-384

表面改性C/C复合材料与LAS玻璃陶瓷的连接

林晓秋,李克智,李贺军,兰逢涛   

  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
  • 收稿日期:2007-11-21 修回日期:2008-03-04 出版日期:2009-02-15 发布日期:2009-02-15
  • 通讯作者: 李克智

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

Lin Xiaoqiu, Li Kezhi, Li Hejun, Lan Fengtao   

  1. C/C Composites Technology Research Center, Key Laboratory of ThermostructureComposite Materials, Northwestern Polytechnical University
  • Received:2007-11-21 Revised:2008-03-04 Online:2009-02-15 Published:2009-02-15
  • Contact: Li Kezhi

摘要: 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。

关键词: C/C复合材料, LAS玻璃陶瓷, MAS玻璃, 连接, 剪切强度

Abstract: 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.

Key words: carbon/carbon composites, LAS glass ceramic, MAS glass, joining, shear strength

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