Friction is important in the production and application of pyrotechnics,and the dynamic friction coefficient is a key parameter for quantitative analyzing the friction work. A new method for determining the dynamic friction coefficient is presented,which combines the physical model of MGY-1 friction device with theoretical analysis and numerical calculations. The dynamic friction coefficients of three pyrotechnic simple substances including potassium nitrate, magnesium and aluminum alloy and sulfur,and two pyrotechnic compounds are measured using this method. The results show that the dynamic friction coefficients of the pyrotechnics are range values,and the dynamic friction coefficient of potassium nitrate decreases with the addition of magnesium and aluminum alloy and sulfur. Moreover the reasons for producing above two phenomena are analyzed theoretically.%摩擦作用对烟火药剂的生产以及使用过程的安全性至关重要,而动摩擦系数是定量研究烟火药剂摩擦做功能力的关键参数.基于MGY-1型摆式摩擦仪的物理模型,结合数值计算方法,得到了测算动摩擦系数的方法.利用该方法测算了硝酸钾、镁铝合金粉及硫磺3种常用烟火药剂单质以及硝酸钾/镁铝合金粉及硝酸钾/硫磺两种混合物的动摩擦系数.结果表明:5种烟火药剂的动摩擦系数为一个范围值；在硝酸钾中加入镁铝合金粉和硫磺后,混合粉末的动摩擦系数较硝酸钾单质减小.从理论上对产生这两种现象的原因进行了分析.
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