Abstract
For the metal-ceramic composite implant, to make good use of the toughness of the metal, there is need to from a thin layer of ceramics. Alumina-coated stainless steel produced by the ion-plating method was investigated. The coated film on the stainless steel substrate was identified as α-Al2O3 by EPMA, XRD and XPS analysis. The proof stress and modulus of elasticity of alumina-coated stainless steel did not exchange by ion-plating. The residual strain on the first point observing cracks ranged from 0.5 to 1.6% by bending test. The composite material of 1〜5 μm thick film of alumina and 1 mm thick stainless steel was able to bend the radius ranging from 87.2 to 49.6 mm without cracking. The corrosion resistance was improved by coating 3 μm thick alumina on SUS 321 and the heat-treated SUS 321 stainless steel in 0.9% NaCl solution.
