采用TG-DSC研究不同包覆壳层厚度、不同壳层种类纳米铝粉的热性能，并对影响纳米铝粉活性的壳层因素作了深入分析。结果表明：同一粒径的纳米铝粉，包覆层越厚，氧化前的质量损失比例越大，氧化增加的质量分数越小，10%和30%高聚物包覆的50 nm铝粉在520~800℃增加的质量23.5%和17.4%，而5%和10%高聚物包覆的100 nm铝粉则增加质量42.5%和36.5%；50 nm铝粉在熔点前的能量释放速率最快，达到最大氧化速率时的温度远低于100 nm铝粉，二者为550℃和590℃，但其活性低于100 nm铝粉。纳米铝粉经高聚物包覆后经185℃热解处理能显著降低壳层厚度，并提高纳米铝粉样品的热性能。
The thermal properties of several kinds of nano-aluminum with different shell and thickness were studied by TG-DSC. The shell’s effect on nano-aluminum’s activity was analysed in detail. The results show that for nano-aluminum with the same particle size,the thicker the shell is,the more weight the particle loses before oxidation,and the less weight the particle gains during oxidation. From 520℃to 800℃,50 nm aluminum powder with 10%and 30%polymer coating gains 23.5%and 17.4%, respectively. And 100 nm aluminum powder coated by 5%and 10%polymer increases 42.5%and 36.5%,respectively. In all,50 nm aluminum powder releases energy more quickly than 100 nm aluminum. At 550℃,50 nm aluminum powder reaches the max oxidation rate,much lower than that of 100 nm aluminum powder,which is 590℃. But the activity of 50 nm aluminum powder is lower than that of 100 nm aluminum powder. The thermal treat at 185 ℃ after coating process can notably reduce the shell’s thickness and increase the thermal properties of nano-aluminum powder.
参考文献
| [1] | Kwok Q S M;Fouchard R C;Turcotte A M et al.Characteriza-tion of aluminum nanopowder compositions[J].Propellants,Explosives,Pyrotechnics,2002,27:229-240. |
| [2] | Patrick Brousseau;C.John Anderson .Nanometric Aluminum in Explosives[J].Propellants, Explosives, Pyrotechnics,2002(5):300-306. |
| [3] | 赵凤起,覃光明,蔡炳源.纳米材料在火炸药中的应用研究现状及发展方向[J].火炸药学报,2001(04):61-65. |
| [4] | Kuo K K;Risha G A;Evans B J.Potential usage of ener-getic nano-sized powders for combustion and rocket propulsion[A].,2004:3-14. |
| [5] | Alexander G;Alexander I;Ulrich F B et al.Characterization of aluminum powders:Ⅱ. Aluminum nanopowders passivated by non-inert coatings[J].Propellants Explosives Pyrotech-nics,2006,31(05):401-409. |
| [6] | Pivkina A;Ivanov D;Frolov Y;Mudretsova S;Nickolskaya A;Schoonman J .Plasma synthesized nano-aluminum powders - Structure, thermal properties and combustion behavior[J].Journal of thermal analysis and calorimetry,2006(3):733-738. |
| [7] | Liangui Guo;Wulin Song;Changsheng Xie .Characterization and thermal properties of carbon-coated aluminum nanopowders prepared by laser-induction complex heating in methane[J].Materials Letters,2007(14/15):3211-3214. |
| [8] | Cliff M;Tepper F;Lisetsky V.Ageing characteristics of Alex nanosize aluminum[A].Salt Lake City,UT,2001 |
| [9] | Tatyana D.Fedotova;Oleg G.Glotov;Vladimir E.Zarko .Application of Cerimetric Methods for Determining the Metallic Aluminum Content in Ultrafine Aluminum Powders[J].Propellants, Explosives, Pyrotechnics,2007(2):160-164. |
| [10] | 何丽蓉,肖乐勤,菅晓霞,周伟良.纳米铝粉热反应特性的TG-DSC研究[J].固体火箭技术,2011(05):628-631. |
| [11] | 何丽蓉,肖乐勤,菅晓霞,周伟良.氧化铝壳层对纳米铝粉的热反应特性影响研究[J].固体火箭技术,2012(03):382-386. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%