SiO2包覆α-AlH3的制备及其稳定性研究  

Study on preparation of SiO coated α-AlH and its stability

作　　者：张耕玮 徐司雨[2] 姚二岗[2] 赵凤起[2] 杨生春[1] Zhang Gengwei;Xu Siyu;Yao Ergang;Zhao Fengqi;Yang Shengchun(MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter,Xi'an Jiaotong University,Xi’an 710049,China;Science and Technology on Combustion and Explosion Laboratory,Xi'an Modern Chemistry Research Institute,Xi'an 710065,China)

机构地区：[1]西安交通大学物质非平衡合成与调控教育部重点实验室,陕西西安710049 [2]西安近代化学研究所燃烧与爆炸技术重点实验室,陕西西安710065

出　　处：《化学推进剂与高分子材料》2020年第5期37-42,共6页Chemical Propellants & Polymeric Materials

摘　　要：为提高AlH3粉体的稳定性,采用溶胶凝胶法在AlH3微米粉体表面包覆一层SiO2,采用扫描电镜、透射电镜、X射线衍射仪、傅里叶变换红外光谱仪、热重及电化学腐蚀等手段对样品进行了表征分析。结果表明,当AlH3与正硅酸乙酯液固比为2mL/g时,包覆效果最佳,在AlH3颗粒表面形成一层均匀的SiO2包覆层。Tafel极化测试结果表明,SiO2包覆能提高腐蚀电位,降低腐蚀电流密度,有效提高AlH3粉体的稳定性。In order to improve the stability of the AlH3 powder,a layer of SiO2 was coated on the surface of the AlH3 micrometer powder by using the sol-gel method.The samples were characterized and analyzed by using the means including the scanning electron microscopy,transmission electron microscopy,X ray diffractometer,Fourier transform infrared spectrometer,thermogravimetry and electrochemical corrosion and so on.The results show that when the liquid-solid ratio of AlH3 to tetraethyl orthosilicate is 2 mL/g,the coating effect is the optimal,a uniform SiO2 coating layer is coated on the surface of AlH3 particles.The Tafel polarization testing results show that coating with SiO2 can increase the corrosion potential,reduce the corrosion current density,and effectively improve the stability of AlH3 powder.

关 键 词：高活性金属 AlH3 SIO2 包覆 稳定性 

分 类 号：V512.3[航空宇航科学与技术—航空宇航推进理论与工程]