Sn系合金のプラズマ溶射における溶射原料および 皮膜組成の変化: 第1報：密着性および成分変化

摘要

Change of spray material and nlm composition in Sn alloy plasma thermal spray coating 一Part1：Coating adhesion and ingredient change一 In the plasma spray process of Sn alloy, a change of the ratio of the composition elements in the thermal spray coating was observed, which change is attributed to the temperature of treatment exceeding the evaporation temperature of a constituent element. It was presumed that this composition change was based on the difference in the evaporation temperature of the composition elements. In adhesion evaluation of the spray coating by shearing tests, adhesion was improved by the blast processing before coating, due to the anchor effect. When adhesion is sufficiently higher than the shear strength of the coating, there is no danger of coating delamination, but for the spray coating in this report it cannot be said that sufficient effect was achieved and further improvement is required.%溶射法は厚膜処理が可能な表面処理法として知られ処理可能な材料も幅広く汎用性も髙レ、溶射法としてワイヤアーク法は簡便ではあるが皮膜中に未溶融成分ゃ空孔がふくまれやすく，溶射膜の品質は芳しくない場合がある。未溶融成分を低減する処理方法としては，材料を高温の溶融状態とするプラズマ溶射があり，ワイヤアーク法に比べて皮膜め溶融状態などの品質が向上する。つまり，より高品質な溶射膜を得るにはこの溶融状態の面からは，プラズマ溶射法の採用が望ましいといえる。