微弧氧化α-Al2O3陶瓷膜生长过程分析

The Analysis of Growth Characteristic of Alumina Coatings by Micro-Plasma Oxidation

摘要:

在交流条件下利用微等离子体氧化技术合成了氧化铝陶瓷涂层。XRD分析结果显示，涂层α-Al2O3相与y-Al2O3相的含量随反应时间而变化。氧化2．5h后可以得到由单一的α-Al2O3相组成的涂层。陶瓷涂层厚度的生长速率大约为0，7μm／min；在135min之后，涂层的厚度基本小变。氧化最初的15min之内，涂层的表而密度仅为0.088mg／cm^2，然后表面密度增大。在氧化15min～60min之内，表而密度(y)与氧化时间呈直线关系。在氧化60min之后，y的增长速率逐渐减小。

Abstract:

In this paper, alumina ceramic coating of aluminum alloy surface was performed using micro-plasma oxidation (MPO) technology. Coating formed after short treatment time was found to consist of -Al2O3 and -Al2O3. Single -Al2O3 coatings can be gained by oxidation for 2.5 h. The growth velocity of coating thickness was 0.7 m/min during first 135 min, then that was constant. The surface density of coating was only 0.088 mg/cm2 at 15th min, then that increases gradually. The surface density increase presented a linear relationship during 15 min~60 min, and after 60 min the increase of surface density of coating is slow.