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1引言利用沉降管测定磨料微粉粒度组成，是磨料行业普遍采用的一种操作简单，测试结果稳定的方法。该方法先后被欧洲磨料协会，西德和ISO定为国家标准和国际标准。我国于1985年也将该方法定为国家标准，并已在全国推广使用。尽管沉降管测定微粉粒度组成的方法操作简单，测试结
1 Introduction The determination of particle size composition of abrasive micropowder by using sedimentation tube is a commonly used method in the abrasive industry with simple operation and stable test results. The method has been European abrasives Association, West Germany and ISO as a national standard and international standards. In 1985, China also defined the method as a national standard and has been promoted throughout the country. Although the sedimentation tube method for determining the composition of the fine particle size is simple, the test results