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石墨的剥落,曳尾表现在抛光时尤为严重。同时,石墨形状与大小的显示,在很大程度上取决于抛光技术,不良的抛光会严重歪曲分析结果。生产实践中,我们发现一种既能取消抛光这道工序,又能准确无误地进行金相检验的方法。试样经砂轮磨平后,先用00号砂纸磨制,然后分别用280,01、05、06号金相砂纸依次磨制,每换一道砂纸,必须与上一道砂纸留下的磨痕呈垂直方向,当磨到06砂纸时,要求砂纸干净,以免划伤磨面。经06砂纸磨制后的样品,可直接进行金相观察。磨面除有少数方向性细磨痕外,石墨干净,无曳尾剥落等现
Graphite spalling, trailing performance is particularly serious polishing. At the same time, the shape and size of the graphite display, largely depends on the polishing technique, poor polishing can seriously distort the analysis results. In production practice, we found a way to both cancel the polishing process, but also accurate metallographic examination method. After the sample is polished by a grinding wheel, it is first polished with 00 sandpaper, and then polished with 280, 01, 05 and 06 metallographic sandpaper in turn, and each time a sandpaper is changed, the abrasion marks left by the previous sandpaper must be made Vertical direction, when grinding to 06 sandpaper, sandpaper required clean, so as not to scratch the grinding surface. After 06 sandpaper after grinding samples, metallographic observation can be directly. In addition to grinding a few directional fine grinding marks, graphite clean, no trailing flaking and so on