【摘要】 制备了Si含量分别为0%,2%及5%的CoCrAlSiY合金涂层,研究了Si元素的添加对合金粉末及涂层的组织、结构及性能的影响,初步探讨了Si元素对涂层高温性能的作用机理。研究结果表明:Si元素主要分布在涂层的β相中,通过影响β相的含量和分布对涂层的高温性能产生影响,Si推进了合金由内氧化向外氧化发生的过程,促进了保护性氧化膜的形成,但Si含量过高,会引起氧化膜的PBR值增加,氧化膜的应力变大,不利于涂层高温抗热震性能的提高。更多还原

【Abstract】 The CoCrAlSiY alloy coating with Si mass concentrations of 0%,2% and 5% was prepared.The effect of Si element on the structure and properties of the alloy powder and coating was analyzed.In addition,the function of Si element on the high temperature performance of the coating was also discussed.The results show that the Si element is mainly distributed in the β phase,whose volume content and distribution have a great influence on the high temperature performance of the coatings.Furthermore,the Si element promotes the change from internal oxidation to external oxidation of the alloy and the formation of the protective oxide film.However,the much higher Si content results in a higher PBR(Pilling-Bed worth ratio) value of the oxide film,and increases the oxide film stress,which is not beneficial to the improvement of the coating thermal shock resistance at high temperatures.更多还原