Evaluation of Interfacial Strength Between SiC Coating and C/C Composite

碳纤维增强碳基复合材料（C/Cs）通常采用抗氧化涂层。对于这种涂层，通常需要与C/C基材的高强度粘合。然而，目前还没有确定薄脆涂层结合强度的方法。本文在采用柱塞法测量断裂载荷的基础上，首次讨论了C/C衬底上SiC涂层界面断裂的判据。断裂力学方法是预测界面断裂的有效方法。然后进行参数化研究，了解各参数对界面断裂载荷的影响。

Carbon fiber-reinforced carbon matrix composites (C/Cs) are usually used with an anti-oxidation coating. For this coating, high strength bonding to the C/C substrate is often required. However no measures to determine bonding strength for thin and brittle coatings has been established. In the present paper, a criterion for interfacial fracture of a SiC coating on a C/C substrate was at first discussed on the basis of fracture loads measured by a specially designed plunger method. The fracture mechanics approach was shown to be successful to predict the interfacial fracture. Then a parametric study was carried out to understand the effect of various parameters on the interfacial fracture loads.