POWDER, SPRAY PROCESS OF ABRADABLE SEAL COATINGS AND ITS BASIC PROPERTIES
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摘要: 分析了几种中温可磨耗封严涂层粉料的特性，并改变喷涂工艺制得不同硬度的涂层，分析了涂层的组织和相结构，探讨了粉料和喷涂工艺对组织结构和基本性能的影响。研究结果表明，国产307涂层粉料颗粒较粗，包覆不理想，涂层组织疏松，硬度偏低。国产310粉料细小，使硬度高出Metco所要求的硬度范围；从硬度方面考核，国产313、601涂层粉料尚可。对试验的几种封严涂层，火焰喷涂通过改变工艺参数容易调整涂层硬度，等离子喷涂则难以调整硬度；火焰喷涂时涂层中有氧化物，而检测不到等离子喷涂有氧化现象。封严涂层的结合强度不宜用粘结拉伸法评价。Abstract: The characteristics of several kinds of powders of medium temperature abradable seal coatings were analysed.The different hardness of the coatings were prepared for one kind of powder by changing spray parameters.The microstructhe and phase were analyed. The effects of the characteristics of the powder and the spray parameters on the microstructure and the basic properties of the coatings were probled. The results show that the particles of 307 (Ni/graphite) domestic powder is coarse, is not well wraped, the microstructure microstructure of the coating made by the powder is lossen, the hardness of the coating is low. because 310(AlSi-graphite) domestic power is fine, the hardness of the coating prepared by the powder is higher than that required by Metco. Acorrding to the hardness of the coatings, the 313(AlSi-graphite) and 601(AlSi/polyester) domestic powder is good. The hardness of 307, 310 coatings is adjusted easy by changing flame spray parameters, but the hardness of 313, 601 coatings is not easy adjusted by changing plasma spray parasmeters. The oxide occurs in the flame sprayed coatings, but the oxide in the plasma sprayed coatings is not examined. The bonding strength between the coating and the substrate can be not evaluated by pull-off method.
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Keywords:
- abradable seal coating /
- powder /
- spray parameter /
- microstructure
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