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Preparation and Characterization of Aluminum‐Lithium Alloy Powder Coated by In‐situ Polymerization of Styrene
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-05-06 , DOI: 10.1002/prep.201900414 Zhengyu Cao 1 , Aobo Hu 1 , Bin Xia 1 , Ai‐min Pang 2 , Shuizhou Cai 1
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-05-06 , DOI: 10.1002/prep.201900414 Zhengyu Cao 1 , Aobo Hu 1 , Bin Xia 1 , Ai‐min Pang 2 , Shuizhou Cai 1
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Aluminum‐lithium alloy powder has broad application prospects in the field of energetic materials due to its good thermal performance. However, the high reactivity of lithium and the incompactness of the surface oxide layer result in the continuous oxidation of the active metal during storage, thereby deteriorating the thermal performance of the powder. In this paper, a layer of polystyrene (PS) was successfully coated on the surface of Al‐10Li (10 wt.%) alloy powder by in‐situ polymerization of styrene (St). According to an orthogonal test, the optimum coating conditions for protection factor were as follows: m(St)/m(Al‐10Li) was 1 : 1; m(AIBN)/m(St) was 5 %; the reaction temperature was 75 °C; the reaction time was 4 h. The structure, surface morphology and thermal properties were characterized by XPS, FTIR, SEM and TG‐DTA. Furthermore, the aging stability of powders were studied by TG‐DTA. The results showed that the decay rate of the weight increase of the active metal of Al‐10Li alloy powder decreased significantly after coating, which demonstrated that the polystyrene coating effectively protected the active metal of Al‐10Li alloy powder, prevented pre‐oxidation of Al‐10Li alloy powder in air and improved its storage stability.
中文翻译：
苯乙烯原位聚合包覆铝锂合金粉末的制备与表征
铝锂合金粉末具有良好的热性能，在高能材料领域具有广阔的应用前景。然而，锂的高反应性和表面氧化物层的不紧密导致储存期间活性金属的连续氧化，从而降低了粉末的热性能。在本文中，通过苯乙烯（St）的原位聚合成功地在Al-10Li（10 wt％）合金粉末的表面上涂覆了一层聚苯乙烯（PS）。根据正交试验，保护系数的最佳涂覆条件如下：m（St）/ m（Al-10Li）为1：1；m（AIBN）/ m（St）为5％; 反应温度为75℃。反应时间为4小时。用XPS，FTIR，SEM和TG-DTA对结构，表面形貌和热性能进行了表征。此外，用TG-DTA研究了粉末的老化稳定性。结果表明，涂层后Al-10Li合金粉末活性金属重量增加的衰减率显着下降，这表明聚苯乙烯涂层有效保护了Al-10Li合金粉末活性金属，防止了Al的预氧化‐ 10Li合金粉末在空气中并改善了其储存稳定性。
更新日期：2020-07-03
中文翻译：
苯乙烯原位聚合包覆铝锂合金粉末的制备与表征
铝锂合金粉末具有良好的热性能，在高能材料领域具有广阔的应用前景。然而，锂的高反应性和表面氧化物层的不紧密导致储存期间活性金属的连续氧化，从而降低了粉末的热性能。在本文中，通过苯乙烯（St）的原位聚合成功地在Al-10Li（10 wt％）合金粉末的表面上涂覆了一层聚苯乙烯（PS）。根据正交试验，保护系数的最佳涂覆条件如下：m（St）/ m（Al-10Li）为1：1；m（AIBN）/ m（St）为5％; 反应温度为75℃。反应时间为4小时。用XPS，FTIR，SEM和TG-DTA对结构，表面形貌和热性能进行了表征。此外，用TG-DTA研究了粉末的老化稳定性。结果表明，涂层后Al-10Li合金粉末活性金属重量增加的衰减率显着下降，这表明聚苯乙烯涂层有效保护了Al-10Li合金粉末活性金属，防止了Al的预氧化‐ 10Li合金粉末在空气中并改善了其储存稳定性。
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