等离子喷涂W-TiC涂层的组织和性能研究

Microstructures and Properties of Plasma Sprayed W-TiC Coatings

分别采用普通大气等离子喷涂和超音速大气等离子喷涂技术在低活化钢表面制备了添加1.5%TiC(质量分数)的钨基涂层。研究了涂层的组织和密度、氧含量、孔隙率和热导率等物理性能。结果表明,用两种工艺制备的涂层中,TiC主要分布于钨片层之间和未熔钨颗粒周围,对片层和颗粒起连接作用;与采用普通大气等离子喷涂制备的涂层相比,超音速大气等离子喷涂的W-TiC涂层的组织更加致密,氧含量降低了0.1%,孔隙率下降近一半,热导率提高至119.6 W/(mK)。

Tungsten-matrix coatings with 1.5 % （by mass ） TiC were fabricated on a low activation steel by conventional and supersonic atmospheric plasma spraying technologies, respectively. The microstructures and physical properties such as density, oxygen content, porosity and thermal conductivity of the coatings were investigated. The results show that in the coatings fabricated by the two spraying technologies TiC is mainly distributed between tungsten lamellae and around un-mehed tungsten particles, acting as connecting the lamellae and the particles. Meanwhile, the W-TiC coating produced by the supersonic atmospheric plasma spraying exhibits denser structure, 0.1% lower oxygen content, and about half lower porosity than the W-TiC coating produced by the conventional atmospheric plasma spraying, and as high thermal conductivity as 119.6 W/（mK）.