The failure of the powder metallurgy valve seat was analyzed by optical microscopy, scanning electronic microscopy, X-ray energy spectrum and X-ray diffraction.
采用力学、物理性能测试，金相、扫描电镜、能谱和X衍射分析研究了气门座圈产品失效的主要原因。
METHODS The powder X ray diffraction analysis was used by spectrum X ray diffraction analysis. The characteristic marked peaks of talcum was found for identification.
方法应用粉末X射线衍射方法，对取自我国主要滑石产区的药用滑石粉样品进行衍射研究（衍射图谱分析及特征标记峰鉴别）。
If they have the X-ray powder diffraction patternsof materials, even if being non-expert on X-ray crystal structure, they can conveniently get the index of diffraction lines and cell parameters.
对于非专业X 射线晶体结构人员，只要得到材料衍射图谱后，能很方便计算点阵常数和衍射线指标化。
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