铝粉和钨粉粒径对W-PTFE-Al复合材料燃烧特性和动态响应的影响（英文）

Effects of Al and W Particle Size on Combustion Characteristics and Dynamic Response of W-PTFE-Al Composites

通过调控金属粉末的粒径可以显著改变W-PTFE-Al复合材料的燃烧特性和动态响应。燃烧性能测试结果表明,随着铝粉粒径从10μm降至1μm,钨粉粒径从0.1μm升至7μm,W(7μm)-PTFE(40μm)-Al(1μm)复合材料在氩气气氛下的反应能量为4570.2 J/g,在氧气气氛下反应能量为9848.1 J/g。这表明减小铝粉粒径和增大钨粉粒径有助于W-PTFE-Al复合材料反应能量值的提高。在冲击条件下,4种W-PTFE-Al复合材料燃烧时间均超过500μs。随着铝粉粒径的减小,反应临界吸收功降低14%,"钝感"特性呈现下降趋势。随着钨粉粒径的减小,反应临界吸收功升高34.8%,"钝感"特性呈现上升趋势。动态压缩试验结果表明,随着铝粉粒径从10μm降至1μm,W-PTFE-Al复合材料的抗压强度提高8.0%;随着钨粉粒径从7μm降至100 nm,W-PTFE-Al复合材料的抗压强度降低10.2%。

The variation of metallic particle size alters the combustion characteristics and dynamic response of W-PTFE-Al composites. Combustion test results show that with Al particle size decreasing from 10 μm to 1 μm, W particle size increasing from 0.1 μm to 7 μm, the reaction energy of W（7 μm）-PTFE（40 μm）-Al（1 μm） reaches 4570.2 J/g in argon environment and 9848.1 J/g in oxygen environment, indicating fine aluminum and coarse tungsten contribute to the increase of reaction energy. Under dynamic loading, the deflagration time of all four kinds of W-PTFE-Al composites is longer than 500 μs. With the decrease of Al particle size, the insensitivity of W-PTFE-Al composites to impact shows a decreasing tendency since the absorbed critical energy before reaction decreases by 14.0%. With the decrease of W particles size, the insensitivity of W-PTFE-Al composites to impact enhances due to the absorbed critical energy before reaction increases by 34.8%. The dynamic compression results show that the ultimate strength of W-PTFE-Al composites increases by 8.0% with Al particle size changing from 10 μm to 1 μm, but decreases by 10.2% with W particle size changing from 7 μm to 100 nm.