| 摘要 |
PURPOSE:To improve the peeling resistance of a melt-sprayed ceramic layer, by melt-spraying beforehand an Al-Si alloy layer on the surface of an Al base material as an underlying layer then melt spraying ceramics on said surface thereby forming the melt spraying layer of ceramics on the surface of the base material. CONSTITUTION:A melt-sprayed film of ceramics consisting of oxide such as alumina, titania, zirconia or the composite oxide thereof having excellent heat resistance, heat insulation and high temp. corrosion resistance is formed on the surface of Al or an Al alloy by melt-spraying beforehand an Al-Si alloy contg. 5-30% Si on the surface of the base material then melt-spraying the intended ceramics such as alumina or titanium thereon. Since the coefft. of thermal expansion the Al-Si melt-sprayed film as an intermediate layer is in the intermediate value between the coefft. of thermal expansion of the base material and that of the melt sprayed ceramic film, the melt-sprayed film of ceramics is held tightly adhered to the base material without stripping that may arise owing to the heat hysteresis of heating and cooling. |
