含能材料
含能材料
함능재료
ENERGETIC MATERIALS
2005年
5期
295-300
,共6页
物理化学%Al%纳米尺寸%热作用%脱附%动力学
物理化學%Al%納米呎吋%熱作用%脫附%動力學
물이화학%Al%납미척촌%열작용%탈부%동역학
physical chemistry%aluminium%nanometer-sized%thermal%desorption%kinetic
纳米Al粉有独特热行为,能增强某些含能材料的性能.然而,纳米Al粉与水的反应性高,导致纳米Al粉"老化",降低了它在含能复合材料中的作用.由于纳米Al粉的老化反应与吸附至其表面的水有关,因此应特别关注水的吸、脱附作用.本文用TG和TG-FTIR-MS研究了纳米Al粉吸附气体的热脱附.结果表明,所研究的纳米Al粉含12%(质量)的吸附气体.用FTIR和MS检测到水和CO2的脱附.用多重加热速率和等温研究,得到了吸附气体的脱附过程动力学参数.对不同方法得到的脱附活化能进行了比较.
納米Al粉有獨特熱行為,能增彊某些含能材料的性能.然而,納米Al粉與水的反應性高,導緻納米Al粉"老化",降低瞭它在含能複閤材料中的作用.由于納米Al粉的老化反應與吸附至其錶麵的水有關,因此應特彆關註水的吸、脫附作用.本文用TG和TG-FTIR-MS研究瞭納米Al粉吸附氣體的熱脫附.結果錶明,所研究的納米Al粉含12%(質量)的吸附氣體.用FTIR和MS檢測到水和CO2的脫附.用多重加熱速率和等溫研究,得到瞭吸附氣體的脫附過程動力學參數.對不同方法得到的脫附活化能進行瞭比較.
납미Al분유독특열행위,능증강모사함능재료적성능.연이,납미Al분여수적반응성고,도치납미Al분"노화",강저료타재함능복합재료중적작용.유우납미Al분적노화반응여흡부지기표면적수유관,인차응특별관주수적흡、탈부작용.본문용TG화TG-FTIR-MS연구료납미Al분흡부기체적열탈부.결과표명,소연구적납미Al분함12%(질량)적흡부기체.용FTIR화MS검측도수화CO2적탈부.용다중가열속솔화등온연구,득도료흡부기체적탈부과정동역학삼수.대불동방법득도적탈부활화능진행료비교.
Aluminium (Al) nanopowder has been shown to possess unique thermal behaviour and to enhance the performance of some energetic materials (EM). However,Al nanopowder has a high reactivity with water,which causes "aging" of Al nanopowder,and consequent reduction in its effectiveness in EM compositions. Water adsorption and desorption is a particular concern,since the aging reaction of Al nanopowders may be related to the water adsorbed on its surface. The thermodesorption of adsorbed gases on nanometer-sized aluminium powders was investigated using Thermogravimetry (TG) and Thermogravimetry-Fourier Transform Infrared-Mass Spectrometry (TG-FTIR-MS). The results show that the Al nanopowder studied contains 12 mass % of adsorbed gases. Desorption of water and carbon dioxide was observed by FTIR and MS. The kinetic parameters for the desorption of the adsorbed gases were determined using variable heating rate and isothermal studies. The activation energies of desorption obtained from the various methods are compared.
