ニッケル溶射皮膜の構造, 機械的性質および熱伝導率

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書誌事項

タイトル別名
  • Structure, Mechanical Properties and Thermal Conductivity of Thermal Sprayed Nickel Coatings
  • ニッケル ヨウシャ ヒマク ノ コウゾウ キカイテキ セイシツ オヨビ ネツ デンドウリツ

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Nickel powder was low pressure plasma sprayed onto a steel substrate, and the influence of the thermal history of the coating on the structures and the properties of the coating were examined. The lamellae of the coating was composed of fine columnar grains when the temperature of the coating was kept low during spraying. As the temperature of the coating during spraying increases, the length of the columnar grains became longer than the thickness of the lamellae. The coating heat-treated after spraying consisted of coarse equiaxed grains and had high porosity that came from the liberation of a plasma gas dissolved in rapidly solidified solid nickel. The hardness, apparent density and the tensile strength of the coating itself were the highest on the coating prepared at a low temperature and became low after heat-treatment. The thermal conductivity measured in the direction perpendicular to the coating was the largest on the coating that consisted of long columnar grains. The cause for the formation of the long columnar grains is discussed in terms of the momentary and local melting of the coating surface that is in contact with the sprayed droplet and the grain growth in the solid state due to the large temperature gradient in the coating.

収録刊行物

  • 高温学会誌

    高温学会誌 30 (6), 336-341, 2004

    一般社団法人 スマートプロセス学会 （旧高温学会）

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