硬脂酸包覆的α-AlH3:制备及其静电感度

摘要

To reduce the electrostatic sensitivity of α-AlH3,α-AlH3 was coated by the solvent-nonsolvent method using stearic acid (SA) as coating material.The crystal structure and morphology of samples before and after coating were characterized by Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),elemental analysis and scanning electron microscopy(SEM).The electrostatic sensitivity of α-AlH3 samples before and after coating was measured by JGY-50Ⅲ type static spark sensitivity tester according to GJB5891.27-2006 method.Results show that a complete,uniform coating layer of SA is formed on the surface of α-AlH3.The crystal structure and morphology of the sample after coating are not changed.When the spark energy required for 50％ initiation probability (E50)decreases from 367 mJ before coating to test limit 5390 m J,the fire does not occur.The coating makes the electrostatic sensitivity reduce.%为降低α-AlH3静电感度,选用硬脂酸(SA)作为包覆材料,采用溶剂·非溶剂法对α-AlH3进行表面包覆.通过傅里叶变换红外光谱(FT-IR)、X射线衍射仪(XRD)、X光电子能谱(XPS)、元素分析和扫描电子显微镜(SEM)对包覆前后α-AlH3的结构和形貌进行表征.按GJB5891.27-2006采用静电火花感度仪JGY-50Ⅲ对包覆前后样品的静电感度进行测试.结果表明:硬脂酸在α-AlH3表面形成均匀完整包覆层,包覆后的α-AlH3样品晶体结构和形貌均未发生变化,E5.由未包覆前的367 mJ降低至测试上限5390 mJ时未见发火,包覆使其静电感度降低.