飞机发动机封严涂层的研究

采用正交设计实验方法对 BH封严涂层的组成进行了优选,并对涂层的固化工艺进行了优选,确定了 BH封严涂层的最佳组成和固化工艺。BH封严涂层的外观均匀细致、气孔数量少,且孔径小。涂层的耐冷热循环性能比目前使用的封严涂层提高了 4倍以上,可耐 3 8次冷热循环,且涂层的固化工艺比较简便。研究发现 :BH封严涂层满足了 3 0 0℃条件下热稳定性的要求;石墨填料有利于改善涂层的附着性能;涂层的硬度主要取决于石棉、ZL填料的含量;封严涂层的耐冷热循环性能主要取决于涂层与基体热膨胀系数的差异

STUDY OF THE ABRADABLE SEAL COATING USED IN AIRCRAFT ENGINE

A new abradable seal coating was investigated. Its composition was optimized by orthogonal tests and the cure process was optimized. The effects of composition and cure process on the properties of the abradable seal coating were investigated and the best composition and cure process were determined. The new abradable seal coating called BH abradable seal coating has better appearance and cool hot cycle resistance than the currently used abradable seal coating. It has little pores, the diameter of the pores is less than 1mm and the cool hot resistance is better. It spalled from the substrate after 38 cool hot cycles. The relations of compostion to properties were investigated. The appearance and hardness mainly depend on composition and cure process; the ability of cool hot resistance mainly depends on the difference of thermal expansion coefficient between coating and substrate. The lower the difference, the better the cool hot resistance.