Abstract
Tungsten coatings of 0.5 and 1 mm thickness were successfully deposited by the vacuum plasma spraying technique on carbon/carbon fiber composite (CFC), CX-2002U, and isotropic fine grained graphite, IG-430U. High heat flux experiments by irradiation of electron beam with uniform profile were performed on the coated samples in order to prove the suitability and load limit of such coating materials. Heat load properties, gases emission, surface modification and structure changes of cross-section of the samples were investigated. Cracks on the surface and exfoliation between the joint interface of the samples were not formed below the melting point. These results indicated that the thermal and adhesion properties between the substrate and coatings were good under high heat flux. Microstructure of the joint interface of the sample was changed in the case of a peak temperature at about 2800°C. Many cracks and traces of melted tungsten flow were observed on the surface after melting and solidification. Large cavities were also formed inside the resolidified tungsten layer.
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