采用表面压痕技术和CCD监测技术研究了PM2000 Fe-Cr-Al高温合金热生长氧化物陶瓷薄膜在压应力作用下的脱落行为.结果表明,表面压痕法产生的压痕周围裂纹区域面积和裂纹宽度可定性表征氧化物陶瓷薄膜附着能力,裂纹区域面积越大或裂纹越宽薄膜附着能力越差;采用CCD摄像技术可以测得氧化物陶瓷薄膜初试脱落温度及脱落区域的形貌、位置、面积等数据.为进一步理解氧化物陶瓷薄膜的脱落机制提供了更多的信息.
Spallation behaviors of thermally grown oxide ceramic films for PM2000 Fe-Cr-Al alloy under compressive stresses were studied by surface impression method and CCD monitoring technique. The results show that the film adhesion can be qualitatively understood by testing crack region area or crack width around impression induced from surface impression technique, that is, the larger the crack region area or the wider the crack, the poorer the film adhesion; oxide film initial spallation temperature and the spalled regions morphology, site and area fraction can be obtained by monitoring continuously the film surface morphology using CCD camera during cooling from high temperature to ambient temperature which provide much useful information for understanding the spallation mechanism of thermally grown oxide ceramic film.
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