Oxidation Resistance of ZrB₂-SiC-WSi₂ Coating Prepared by Vacuum Plasma Spraying

E-ISSN： 1662-9779|2018|281|522-527

ISSN： 1012-0394

Source： Solid State Phenomena, Vol.2018, Iss.281, 2018-10, pp. : 522-527

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Abstract

ZrB₂-SiC-WSi₂ (labeled as ZSW) coating and ZrB₂-SiC (labeled as ZS) coating were fabricated by vacuum plasma spray technique. The microstructure and composition of as-sprayed coating were detected through X-ray diffraction (XRD), scanning electron microscope (SEM) and X-ray energy dispersive spectrometry (EDS). Oxidation behaviors and microstructure evolution of these coatings were evaluated at 1500 °C in air and compared with ZrB₂-SiC coating. The results showed that the addition of WSi₂ improved the oxidation resistance of the ZrB₂-SiC coating. There was more liquid formed on the ZSW coating surface. Some bubbles were also observed on the coating surface, which might be resulted from gas formation. It can be concluded that the amount of WSi₂ had great influence on its function in ZrB₂-SiC system.