アルミナ溶射被覆鋼の耐高温酸化性

セラシック溶射に関する研究 (第1報)

抄録

Heat-resisting characteristics at temperatures between 900-1000°C, of the steel plate coated with ceramics by flame spraying were studied, and the following result was obtained. Flame spraying was carried out by powder method or rod method.
1. Steel plate coated with fused Al₂O₃ is nearly 3 times more resistant to oxidation than bare steel. But the coating technique in this case is not easy and the film is liable to strip out.
2. When metallic Cr is added to Al₂O₃, the porosity of the film is reduced and the oxidation resistivity is increased. The maximum of the porosity was found between the Cr content of 20-50%.
3. The film is more closely adhered if the steel surface is at first covered with Fe-Al alloy and the flame spray is carried out on the alloy. Covering with Co metal with electroplating gives nearly the same effect.
4. When the fused Al₂O₃ tube connected through hole with metal wire is used as spraying rod, very resistant coating is obtained as in the case of (2).