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Effect of Oxidation Behavior on the Mechanical and Thermal Properties of Plasma Sprayed Tungsten Coatings

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Abstract

Tungsten (W) coatings have been prepared via air (APS) and vacuum plasma spraying (VPS) technologies, respectively. The microstructures and chemical compositions of the coatings were comparatively studied; meanwhile, the mechanical and thermal properties were evaluated. The results obtained showed that oxide content in the VPS-W coating was apparently lower than that of the APS-W coating because of the different surrounding atmosphere, which influenced the mechanical and thermal properties of the coatings directly. Similar microstructures were observed for the VPS-W and the APS-W coating, but the VPS-W coating was much denser. The bonding strength of the VPS-W coating was much higher than that of the APS-W coating. Thermal conductivity of the VPS-W coating was 59.3 W/m · K at room temperature while the APS-W coating was 32.2 W/m  K. Thermal loading experiments of electron beam showed that the VPS-W coating could withstand the heat load of 10.75 MW/m2, while the APS-W coating formed serious cracks on its surface at the load of 7.5 MW/m2.

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Authors and Affiliations

  1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai, 200050, People’s Republic of China

    Deyang Hu, Xuebin Zheng, Yaran Niu & Heng Ji

  2. Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, 230031, People’s Republic of China

    Fali Chong & Junling Chen

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  1. Deyang Hu
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  2. Xuebin Zheng
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Correspondence to Xuebin Zheng.

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Hu, D., Zheng, X., Niu, Y. et al. Effect of Oxidation Behavior on the Mechanical and Thermal Properties of Plasma Sprayed Tungsten Coatings. J Therm Spray Tech 17, 377–384 (2008). https://doi.org/10.1007/s11666-008-9190-4

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