摘要
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 characteristics and thermal conductivity of the micro-arc oxidation films on high silicon aluminum alloy were studied by SEM,EDS,XRD and thermal conductivity tester. The results show that with the increase of the thickness of the films,the density of the films is improved,the content of mullite and thermal conductivity of the films increase. With the ambient temperature increasing from 298 K to 623 K,the thermal conductivity of the films decreases by about 70% and decreases by 2 to 3 orders of magnitude compared with the substrate;After 60 times thermal shock test by air and water cooling,respectively,no visible cracks are observed on the surface of MAO films.
作者
鲁闯
谢发勤
朱利萍
LU Chuang XIE Faqin ZHU Liping(Northwestern Polytechnical University, Xi＇an 710072, China Ningbo Branch of Chinese Academy of Ordnance Science, Ningbo 315103,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2017年第2期56-60,共5页
Ordnance Material Science and Engineering
关键词
AL-SI合金
微弧氧化
微观结构
导热系数
热震试验
Al-Si alloy
micro-arc oxidation
microstructure
thermal conductivity
thermal shock test
