采用双阴极等离子技术在石墨基材表面制备铱-锆涂层。在不同温度(400、600和800℃)环境下，研究涂层的氧化性能；以及对不同厚度的涂层的氧化性能进行研究。利用带有电子能谱仪的扫描电子显微镜观察涂层的微观结构和鉴定涂层的成分。结果表明，涂层表面是致密的，且由许多球形颗粒组成。高温氧化后，涂层表面出现起皱和微裂纹，这是由于表面形成了氧化物以及涂层与基体的热膨胀系数不匹配引起的。随着涂层厚度变厚，涂层表面起皱有明显改善。随着氧化温度的升高，涂层氧化性能也发生变化。致密的涂层表面演变成粗糙的、含有缺陷的表面。
Ir-Zr-O coating was produced on graphite substrates by double glow plasma. The effects of the thickness and oxidation temperature on oxidation behavior of the coating were studied. The oxidation behavior of the coating was studied at different temperatures of 400, 600 and 800℃. The microstructure and composition of the coating were determined by scanning electron microscopy and energy dispersive spectroscopy, respectively. The results showed that the coating was dense, and was composed of many sphere-shaped particles. After oxidation, the rumpling and the cracks appeared on the surface of the coating, which was due to the formation of oxide and the thermal expansion mismatch between the coating and the substrate. With increased the thickness of the coating, the rumpling of the coating was improved. With increased of the oxidation temperature, the oxidation behavior of the coating was changed. The dense coating evolved into the rough coating with defects and microcracks on the surface.
参考文献
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