| 摘要 |
PURPOSE:To enhance the wear-resistance and toughness of a ceramic tool, by holding a sintered ceramic mother material at a temperature of 1,150-1,500 deg.C, and by covering the outer surface of the mother material with a thin Al2O3 film having a thickness of 0.5-20mum with the use of a chemical gas phase vapor deposition. CONSTITUTION:If a covering layer is formed at a temperature below 1,150 deg.C, it may not ensure a sufficient useful life for an Al2O3 covering film, but if it is formed at a temperature about 1,500 deg.C, the particle size of Al2O3 particles is greater than about 5mum so that the wear-resistance of the covering film is deteriorated and therefore is unpreferably. Accordingly, a sintered ceramic mother material is held at a temperature of 1,150-1,500 deg.C. Further, if a thin Al2O3 film layer has a thickness of less than 0.5mum, the effect of improvement in the wear-resistance may not be expected, and if the thickness of the film layer is greater than about 20mum, it is economically unpreferable since the effect due to covering by the Al2O3 film layer is saturated. Accordingly, the outer surface of the sintered ceramic mother material is covered with a thin Al2O3 film having a thickness of 0.5-20mum with the use of a gas phase vapor deposition process.
|
