| 摘要 |
PURPOSE:To obtain a lightweight and heat resistant coating having superior heat insulation, thermal shock resistance, airtightness and mechanical strength by coating the surface of a substrate with ceramic powder and Al alloy powder by thermal spraying and by removing the Al alloy parts in the resulting coating by eluting to make the coating porous. CONSTITUTION:Powder of ceramics such as stabilized ZrO2 is mixed with powder of Al or an Al alloy such as an Al-Si alloy. The surface of a heat resistant alloy substrate is coated with the powdery mixture by thermal spraying and the Al or Al alloy parts in the resulting coating are removed by chemical or physical elusion to make the coating porous. For example, the coated substrate is immersed in the aqueous soln. of HCl or the like to remove the Al or Al alloy parts by chemical elusion. By this method, a lightweight and heat resistant coating having a long service life can be formed.
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