机加工对NiCrAl/SiO_2可磨耗封严涂层性能影响
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摘要
利用大气等离子喷涂技术制备NiCoCrAl·Y_2O_3粘结底层,火焰喷涂技术制备NiCrAl/SiO2可磨耗封严涂层,研究了机加进刀量和机加线速度对NiCrAl/SiO_2涂层表面形貌、粗糙度和硬度的影响。经机加后,涂层相对平整、存在着明显的球形SiO2颗粒和带有切削碾压痕迹的NiCrAl组织形貌,同时伴有大量孔隙,涂层表面粗糙度大幅度降低,涂层硬度与喷涂态保持一致。当机加进刀量位0.10mm、机加线速度为1170mm/s时,ΔRamax和ΔHR15Ymax最小,分别为1.14μm和4HR15Y,粗糙度和硬度均匀程度最好,是NiCrAl/SiO_2封严涂层合适的机加工参数。
The NiCoCrAl·Y_2O_3 bond coatings was fabricated by air plasma spraying technique and NiCrAl/SiO_2 abradable sealing coating was fabricated by flame spraying technique. The effect of machining unit feed and machining speed on the surface morphology, roughness and hardness of Ni Cr Al/SiO_2 abradable sealing coating was investigated. After machining, the coating surface was relatively smooth and has the obvious spherical SiO_2 particles, the cutted and rolled traced NiCrAl microstructure morphology and many pores. The coating surface roughness decreased dramatically. The coating hardness was as same as the as-sprayed sample. When the machining unit feed was 0.10 mm and machining speed was 1170 mm/s the proper machining parameters of NiCrAl/SiO_2 abradable seal coating can be obtained, and the ΔRamax 和 ΔHR15 Ymax reached the minimum value, namely 1.14μm and 4HR15Y respectively, meanwhile the homogeneity of the coating roughness and hardness is good.
The NiCoCrAl·Y_2O_3 bond coatings was fabricated by air plasma spraying technique and NiCrAl/SiO_2 abradable sealing coating was fabricated by flame spraying technique. The effect of machining unit feed and machining speed on the surface morphology, roughness and hardness of Ni Cr Al/SiO_2 abradable sealing coating was investigated. After machining, the coating surface was relatively smooth and has the obvious spherical SiO_2 particles, the cutted and rolled traced NiCrAl microstructure morphology and many pores. The coating surface roughness decreased dramatically. The coating hardness was as same as the as-sprayed sample. When the machining unit feed was 0.10 mm and machining speed was 1170 mm/s the proper machining parameters of NiCrAl/SiO_2 abradable seal coating can be obtained, and the ΔRamax 和 ΔHR15 Ymax reached the minimum value, namely 1.14μm and 4HR15Y respectively, meanwhile the homogeneity of the coating roughness and hardness is good.
引文
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[3]张佳平,袁福河,王璐等.航空发动机常用封严涂层的金相制备与显微组织检测技术[J].材料保护,2017,1(50):68-72.
[4]史朝龙,彭瑾.Ni Al/BN可磨耗封严涂层摩擦磨损性能研究[J].热喷涂技术,2012,4(4):38-41.
[5]程旭莹,章德铭,刘建明,等.不同粘结剂制备的铝硅氮化硼复合粉末材料及封严涂层性能研究[J].热喷涂技术,2015,7(1):56-61
[6]林琳,刘长雁,张瑞武等.等离子喷涂铝硅—聚苯酯封严涂层厚度与性能关系研究[J].机械工程师,2016,3:232-233.
[7]王贺权,董士峰,张佳平.基体结构对Al/BN涂层性能的影响[J].真空,2015,1(52):1-3.