多孔ZrO_2-8wt%Y_2O_3涂层的制备及性能（英文）

Formation and Properties of Porous ZrO_2-8wt%Y_2O_3 Coatings

航空发动机的效率与转动叶片和机匣之间的间隙密切相关。为了控制转子和静子之间的间隙,需要在机匣表面制备耐磨耗的封严涂层。在发动机的高温端,ZrO_2-8wt%Y_2O_3(质量分数)涂层是经常采用的封严涂层基体。涂层中的孔隙可以增加涂层的耐磨耗性。利用聚苯酯(PHB)增加等离子喷涂的ZrO_2-8wt%Y_2O_3涂层的孔隙率。为了避免聚苯酯在等离子喷涂过程中的烧损,利用溶胶-凝胶法在聚苯酯颗粒表面沉积一层TiO_2层。讨论采用此方法制成的涂层的形态、孔隙率、硬度和耐磨耗性。结果表明,在喷涂粉末中混合包覆型的聚苯酯后,涂层的孔隙率得到提升,涂层硬度下降。磨耗试验的结果表明涂层的磨耗深度随着涂层孔隙率的增加而增加。

The efficiency of a gas turbine engine is highly dependent upon the clearance between blades and engine case. To control the over-tip leakage, an abradable coating system is sprayed on the case surface. In the high temperature section, a ZrO2-8 wt%Y2O3（YSZ） coating is usually applied. Pores in the coating enhance its abradability. In this study, poly-p-hydroxybenzoate（PHB） powder mixed in the YSZ powder was used as pore-forming material. To avoid burning loss of PHB during the spraying process, a sol-gel method was used to clad a TiO2 shell on the PHB powder surface. The porous YSZ coating was deposited by plasma spraying. The characteristics of the coatings were investigated in this work, such as morphology, porosity, hardness, corrosion resistance and abradability. The results show that the coated PHB increases the porosity of the YSZ coating, and then decreases the coating hardness. Finally, a rotated invading test indicates the incursion depth increases with the increase of coating porosity, suggesting the coating abradability is improved.