種々の方法で溶射したCo-Cr-Mo合金溶射皮膜の組織と硬さへの影響因子

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  • Micro Structure of Co-Cr-Mo Alloy Coatings Sprayed by Cold Spray HVOF and Plasma Spray Processes and Influential Factor of their Micro Vickers Hardness
  • シュジュ ノ ホウホウ デ トカ サシタ Co-Cr-Mo ゴウキン ヨウシャ ヒマク ノ ソシキ ト カタサ エ ノ エイキョウ インシ

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Co-Cr-Mo alloy has superior material properties such as corrosion and wear resistance and so on. Therefore the alloy is applied to biomaterial. Most studies, however. have not focused on the thermal spray using Co-Cr-Mo alloy. In this study gas atomized Co-Cr-Mo powder was sprayed on SS400 substrate using cold spray, HVOF and plasma spray methods. Kinetic Metallization System manufactured by Inovati, USA was used as cold spray equipment. Plasma spray was carried out in various spray conditions. Their coating micro structures were observed by FE-EPMA (JXA-8530F manufactured by JEOL) and micro vickers hardness were measured. Cold sprayed coating and used powder were observed electron backscatter diffraction pattern (EBSD). Also heat treated ones were observed, too.HVOF and plasma sprayed coatings consist oxide in their coatings. Cold sprayed coating was dense coating without oxide. Micro Vickers hardness of coating sprayed by cold spray was higher than other sprayed coatings. Micro Vickers hardness of coatings sprayed by plasma spray tend to increase with increasing plasma power. It was due to quantity of oxide in coating. On the other hand much deformation exists in cold sprayed coating from EBSD analysis. Used powder was γ phase and cold sprayed coating was almost ε phase. Stress - induction phase transformation occurs in cold spray process. It is clear that the high hardness is due to deformations in the coating.

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