摘要
采用真空等离子喷涂与大气等离子喷涂的复合方法在K77基体材料表面制备出具有三层结构的MCrAlYs高温封严涂层,分别测量了涂层的金相组织、结合强度、表面洛氏硬度(HR15Y)以及抗粒子冲刷能力等性能。研究结果表明:喷涂功率是影响高温封严涂层性能的关键因素,喷涂功率高,粒子熔化好、涂层结合好、抗粒子冲刷性能相对较高;但是喷涂功率过高,涂层表面洛氏硬度相对较高,使用过程中,涂层易对转子叶片造成磨损伤害。因此选择合适的喷涂功率以在涂层结合效果与表面硬度之间建立一个平衡是高温封严涂层应用的关键。研究发现:在试验范围内,31kW为最合适的喷涂功率。
Three-layer MCrA1Ys high temperature seal coatings were prepared on K77 alloy by low pressure plasma spray （LPPS） and air plasma spray （APS）. Its metallographic structure, bonding strength, surface rockwell hardness（HR15Y） and anti-particle-blast performance were tested. The results show that the spray power is the key factor of the coating performance. The higher the spray power is, the better the particles melted. Therefore, the coatings will have higher bonding strength and better anti-particle-blast. However, if the power is too high, the coatings~ surface hardness will change into higher value and do more damages to blades. As a result, the points to find a suitable power to keep a balance between the bonding strength and the surface hardness for applications. It is found that 31 kW is better for the coatings in the test range.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2012年第6期68-72,共5页
China Surface Engineering
关键词
高温封严涂层
粒子冲刷
表面洛氏硬度
high temperature seal coatings
anti-particle-blast
surface rockwell hardness
