プラズマ溶射条件と遮熱コーティングの機械的特性の関係

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  • Relationship Between Plasma Spray Condition and Mechanical Properties of Thermal Barrier Coating
  • プラズマ ヨウシャ ジョウケン ト シャネツ コーティング ノ キカイテキ トクセイ ノ カンケイ

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It is well known that plasma spray condition affects the mechanical properties such as elastic modulus, coefficient of thermal expansion (CTE) and coating fracture strength. Therefore, residual stress formed in the sprayed coating and coating stress generated during in-service are dramatically changed with the plasma spray condition. In this study, effect of several kinds of plasma spray conditions on the mechanical property of ceramic coating in thermal barrier coating system was examined experimentally. Typical thermal barrier coating system composed of a partially stabilized zirconia (its chemical composition is 8wt% Y_2O_3-ZrO_2) and CoNiCrAlY bond coating was selected herein. In-flight particle velocity and temperature, and the substrate temperature were changed as the plasma spraying process parameter. For the ceramic coating, the microstructural parameter such as porosity and Vickers hardness, and the mechanical property such as CTE, elastic modulus and bending fracture strength were measured systematically. As the results obtained by this study, it was found that elastic modulus and bending strength of the ceramic coating were proportionally increased with Vickers hardness, which can characterize mechanical properties of the plasma-sprayed coating.

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