原子层沉积氧化铝包覆羰基铁粉的抗腐蚀性及吸波性能

发布时间：2018-03-29 02:25

  本文选题：原子层沉积　切入点：羰基铁粉　出处：《无机材料学报》2017年07期

【摘要】：为了提高羰基铁粉的抗腐蚀能力及改善其电磁性能,以TMA和H_2O为前驱体,利用原子层沉积(ALD)方法对羰基铁粉进行表面包覆改性,在羰基铁粉表面包覆不同厚度的氧化铝。通过扫描电镜(SEM)、透射电镜(TEM)、综合热分析仪(TGA)、红外光谱(FTIR)和矢量网络分析仪等技术手段系统分析了改性前后羰基铁粉性能指标。结果表明,通过ALD方法可在羰基铁粉表面生长纳米级别具有良好保型的氧化铝薄膜,形成了极佳的羰基铁/氧化铝壳层结构复合材料。与原样品相比,包覆改性后的羰基铁粉热稳定性与抗腐蚀性有极大的提高,且随着包覆厚度的增加,抗氧化能力增强,最大抗氧化温度可超过550℃。同时羰基铁粉包覆氧化铝后,其介电常数明显减小,磁导率变化相对较小,改善了原羰基铁粉的电磁参数与吸波性能。
[Abstract]:In order to improve the corrosion resistance and electromagnetic properties of iron carbonyl powder, surface coating modification of iron carbonyl powder was carried out using TMA and H 2O as precursors. The properties of carbonyl iron powder before and after modification were systematically analyzed by means of scanning electron microscope (SEM), transmission electron microscope (TEM), TGA, FTIR (FTIR) and vector network analyzer. Indicators. The results show that. Alumina thin films with good shape preservation can be grown on the surface of carbonyl iron powder by ALD method, and excellent carbonyl iron / alumina shell structure composite can be formed. The thermal stability and corrosion resistance of the modified carbonyl iron powder were greatly improved, and with the increase of the coating thickness, the oxidation resistance increased, and the maximum oxidation resistance temperature could exceed 550 鈩，

本文编号：1679155