纳米结构陶瓷涂层的磨削表面残余应力的X衍射测定法

X ray measuring method for nanostructured ceramic coatings grinding surface residual stresses

磨削后的纳米结构陶瓷涂层零件表面会出现使零件强度降低的裂纹,而产生这些裂纹的原因就是磨削表面残余应力。这些表面残余应力使不同晶粒的同族晶面面间距随晶面方位及应力的大小发生有规律的变化,从而使X射线衍射谱线发生位偏移,根据位偏移的大小利用σ=K·M就可以计算出残余应力的大小。

The crack which reduced the components intensity appeard on the surface of nanostructured ceramic coatings after grinding, it was the grinding surface residual stresses that caused the crack. These surface residual stress caused surface distance changed orderly along with the crystal face position and the stress size for the consanguineous crystal face in different crystal grain, thus caused X beam diffraction spectral line to have a position displacement, the residual stress can be calculated out according to the position displacement and use σ=K·M.