高温学会誌
Print ISSN : 0387-1096
セラミック溶射皮膜構造評価法としてのキャビテーション・エロージョン試験の有効性
植松 進谷 和美菅澤 忍川並 康剛難波 吉雄高畠 剛吉岡 勝石原 泰明
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2011 年 37 巻 6 号 p. 298-305

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  The microstructure of plasma sprayed ceramic coatings is characterized by the existence of splats along with other morphological features such as interlamellar and globular pores, intrasplat microcracks and splat boundaries. These various process-dependant micro- defects extremely influence physical and mechanical properties such as thermal conductivity and elastic modulus and then influence coating behavior. In this approach, the process involved in the cavitation erosion of plasma sprayed ceramic coatings have been studied using the ultrasonic vibratory technique. The weight loss occurring during fifteen minute intervals of exposure to cavitational erosion was determined, the surface of specimens and the wear debris were examined by Scanning electron microscopy (SEM). The results suggest that the improvement in coating performance could be achieved by controlling the effective contact between lamellae of which the coating is made up using the plasma spray conditions, such as sufficient preheat, short standoff distance and slow gun traversing movement.

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© 2011 (社)高温学会
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