摘要
采用等离子喷涂工艺制备了四种结构的金属－陶瓷复合涂层，对涂层进行了热震试验，并探讨了涂层的热震失效机制。试验结果表明，涂层热震失效的本质为循环应力作用下的疲劳失效，其失效过程包括裂纹形成、扩展及最终剥落三个阶段。采用多层过渡复合涂层可有效地缓和涂层内热应力，阻碍涂层内裂纹的形成及扩展，从而大幅度提高涂层的抗热震性。
Abstract Four kinds of structures of metal/ceramic compound coatings were prepared by plasma spraying. The thermal shock resistance of coatings was investigated. The thermal shock failure mechanism of coating was studied too. It was found that the thermal shock failure mechanism of coating was thermal stress fatigue destruction. The process of destruction included three steps, they were the crack’s forming, expanding and spalling. The multi layer compound coatings remarkably raised the thermal shock resistance because the coating can relax the thermal stress and hinder the crack forming, expanding and spalling.
出处
《机械工程材料》
CAS
CSCD
北大核心
1999年第4期28-30,54,共4页
Materials For Mechanical Engineering
基金
中国石油天然气总公司中青年创新基金
山东省科委科研基金
