陶瓷涂层断裂韧性的表征
Characterization on Fracture Toughness of Ceramic Coatings
武 创, 郗雨林, 王其红, 张新杰
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作者单位：中国船舶重工集团公司 洛阳船舶材料研究所, 河南 洛阳 471039
中文关键字：陶瓷涂层； 断裂韧性； 表征方法
英文关键字：ceramic coating; fracture toughness; characterization methods
中文摘要：由于陶瓷本身的脆性，陶瓷涂层的应用受到了极大的制约。 断裂韧性是反映材料抵抗裂纹失稳扩展能力的力学性能指标， 陶瓷涂层因为脆性和低维特点， 对其断裂韧性的表征存在较大困难， 目前主要有临界应力强度因子KⅠC、临界裂纹扩展能量释放率GⅠC和裂纹密度β三种表征方法。本文对上述方法进行了总结、分析。
英文摘要：Due to the brittleness of ceramic materials, the application of ceramic coatings is badly influenced. Fracture toughness is a mechanics parameter reflecting material ability of resistance to crack propagation. It is difficult to measure the fracture toughness of ceramic coatings because of their brittleness and 2D characteristics. However, three parameters, critical stress field intensity factor KⅠC, critical strain energy release rate GⅠC and crack density β, can be used to characterize ceramic coating toughness. These methods are described and analyzed.