采用磁控溅射技术在1Cr18Ni8Ti不锈钢表面制备出铝镀层,并对其进行微弧氧化处理,获得了氧化铝阻氚涂层。采用XRD,SEM表征涂层的结构和形貌。结果表明,磁控溅射制备的铝镀层非常致密,微弧氧化得到的氧化铝涂层由外层的疏松层和内层的致密层组成,微弧区瞬间高温烧结作用使微弧氧化膜具有晶态氧化物陶瓷相结构。氧化铝涂层由α-Al2 O3相和γ-Al2 O3相组成,冷却速率大,外层形成γ-Al2 O3相,由于外层γ-Al2 O3包覆和热扩散阻挡作用,内层的氧化铝冷却速度小,生成稳态相α-Al2 O3的含量增加,随着涂层厚度增加,α-Al2 O3相含量提高。
Aluminium coating was prepared on stainless steel by magnetron sputtering technology.The alumina coatings were synthesized by micro-arc oxidation technology at different arc starting voltage and processing time.The film surface morphology and structure were investigated by SEM and XRD.The results show that the aluminium films are compact and smooth.The alumina coatings are composed of inner compact layer and outer loose one.The outer layer isγ-Al2 O3 due to the high cooling rate.The inner layer isα-Al2 O3 because of the low cooling rate caused by the heat preservation of outerγ-Al2 O3 .The coatings are the mixture ofα-Al2 O3 andγ-Al2 O3 .The content ofα-Al2 O3 is increased with the coatings thickness increasing.
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