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首页> 外文期刊>Fusion Engineering and Design >Comparison of W-TiC composite coatings fabricated by atmospheric plasma spraying and supersonic atmospheric plasma spraying
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Comparison of W-TiC composite coatings fabricated by atmospheric plasma spraying and supersonic atmospheric plasma spraying

机译：大气等离子喷涂和超音速大气等离子喷涂制备的W-TiC复合涂层的比较

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摘要

Tungsten coatings with 1.5 wt.% TiC (W/TiC) were fabricated by atmospheric plasma spraying (APS) and supersonic atmospheric plasma spraying (SAPS) techniques, respectively. The results showed that the typical lamellar structure of plasma spraying and columnar crystalline grains formed in the coatings. Pores located mainly at lamellar gaps in association with oxidation were also observed. TiC phase, distributed at lamellar gaps filled the gaps; and that distributed around un-melted tungsten particles and splashed debris coated the particles or debris that were linked with the TiC at lamellar gaps. The coating and linking of the retained TiC phase prevented the tungsten particles to come off from the coatings. The porosity and the oxygen content of the SAPS-W/TiC were lower than those of the APS-W/TiC coating. The mechanical response of the coatings was strongly dependent on the H/E* ratio (H and E* are the hardness and effective Young's modulus, respectively). The SAPS-W/TiC coating with a higher H/E* ratio had a better ability to resist to elastic fracture and better fracture toughness as compared with the APS-W/TiC coating with a smaller H/E* ratio. The thermal conductivity of the SAPS-W/TiC coating was greater than that of the APS-W/TiC coating. (c) 2016 Elsevier B.V. All rights reserved.
机译：具有1.5 wt。％TiC（W / TiC）的钨涂层分别通过大气等离子喷涂（APS）和超音速大气等离子喷涂（SAPS）技术制成。结果表明，等离子体喷涂的典型层状结构和涂层中形成的柱状晶粒。还观察到孔主要与氧化相关地位于层状间隙处。 TiC相，分布在层状缝隙中填补了缝隙；散布在未熔化的钨颗粒周围，飞溅的碎屑覆盖了与TiC在层状缝隙处相连的颗粒或碎屑。保留的TiC相的涂层和连接防止了钨颗粒从涂层上脱落。 SAPS-W / TiC的孔隙率和氧含量低于APS-W / TiC涂层的孔隙率和氧含量。涂层的机械响应在很大程度上取决于H / E *比（H和E *分别是硬度和有效杨氏模量）。与具有较小H / E *比的APS-W / TiC涂层相比，具有较高H / E *比的SAPS-W / TiC涂层具有更好的抗弹性断裂能力和较好的断裂韧性。 SAPS-W / TiC涂层的导热系数大于APS-W / TiC涂层的导热系数。 （c）2016 Elsevier B.V.保留所有权利。

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