Abstract
The pulsed DC tungsten inert gas (TIG) method was employed to post-spray treat an electroconductive Al2O3–TiB2 coating by atmosphere plasma spraying (APS) Al2O3–30 wt-%TiB2 powder. The microstructure and mechanical properties of the coatings before and after treatment were comparatively investigated by scanning electron microscopy, laser scanning confocal microscopy, X-ray diffraction, microhardness tester and block on ring wear tester. It was detected that the treated coating presented a two layer structure consisting of the remelted zone and the sintered zone, which was comprised of TiB2 and single α-Al2O3; surface roughness of the treated coating exhibited a remarkable decrease while microhardness and wear resistance showed a significant increase. These experimental results could be ascribed to the effect of high heat input and discharge plasma during the pulsed DC TIG treating.
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