论文部分内容阅读
利用SEM、EDS、XRD及导热系数测试仪研究不同厚度高硅铝合金微弧氧化膜层的结构特点及其导热性能,用数值分析方法优化最佳隔热性能膜层厚,并用热震试验研究膜层的耐热冲击性能。结果表明:随氧化膜厚度的增加,膜层莫来石相含量增加、致密性提高;膜层导热系数随膜厚的增加而增大,随环境温度的升高而减小;环境温度从298 K上升到623 K,氧化膜导热系数减少约70%,相对于基体合金降低2~3个数量级;膜层分别经60次空冷和水冷热震试验,表面均未出现肉眼可见的裂纹。
The structure and thermal conductivity of MAO coatings with different thickness were studied by SEM, EDS, XRD and thermal conductivity tester. The optimum thermal insulation film thickness was optimized by numerical analysis. The thermal shock test Film thermal shock resistance. The results show that with the increase of the thickness of the oxide film, the content of mullite phase increases and the compactness increases. The thermal conductivity of the film increases with the increase of the film thickness and decreases with the increase of the ambient temperature. From 298 K increased to 623 K, the thermal conductivity of the oxide film decreased by about 70%, compared with the base alloy decreased by 2 to 3 orders of magnitude; the film was 60 air-cooled and water-cooled thermal shock test, the surface were not visible macroscopic cracks.