报道了在奥氏体不锈钢表面制备氧化物陶瓷膜的新方法.首先用热浸镀工艺在不锈钢表面镀铝,然后利用铝的微弧氧化形成了Al2O3陶瓷膜.对所获得的样品进行了断面形貌观察、成分和相组成分析发现,在金属间化合物上形成的陶瓷膜主要由α-Al2O3和γ-Al2O3构成,γ-Al2O3的含量高于α-Al2O3.对其硬度测试发现,从基底到表面硬度呈梯度分布,氧化物陶瓷表面的硬度约为800HV.
A new method of surface treatment for austenitic stainless steel sheets was developed to improve their mechanical performance. An aluminium layer
was firstly formed on the surface of stainless steel by immersing the sheet into a 760℃ molten aluminium bath for 8 min. The aluminized stainless
steel sheet was then treated by micro-arc discharge oxidation. The structure of the resultant compound coating was analyzed by using X-ray diffraction,
scanning electron microscopy with energy dispersive spectrometer and Vickers micro-hardness tester. The results show that a ceramic coating composed mainly
of α-Al2O3 and γ-Al2O3 is formed on a medium intermetallic compound layer and the content of γ-Al2O3 is higher than that of α-Al2O3. The micro-hardness of the compound coating
shows a gradation from the coating surface (800HV) to the substrate (230HV) through the medium intermetallic compound layer (250～600HV).
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