減圧プラズマ溶射したセラミックコーティング材料のスラリーエロージョン特性

抄録

The most remarkable feature of the jet-in-slit apparatus for the slurry erosion test is that the solid particles impinge at various angles different from place to place on the specimen surface. Still, as the exact impact angle at any one place on the surface has been already determined, the impact angle dependence of erosion rate can be easily investigated by measuring the erosion depth distribution over a single specimen surface. Using the test apparatus, the feasibility of ceramic coatings as slurry erosion-resistant material was elucidated. As a result, it was revealed that ceramic coatings have good erosion resistance as compared with metallic materials at shallow impact angles; the order of erosion resistance in three kinds of ceramic coatings was chromia>alumina>zirconia. The same order of performance was obtained in a rotating disk type apparatus which simulates pump impeller erosion.