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非化学计量比镁铝尖晶石粉体的制备及性能
作者:段锦霞1 王修慧1  宏1 杨金龙2  妍3 
单位:(1. 大连交通大学 辽宁省无机超细粉体制备及应用重点实验室 辽宁 大连 116028 2. 清华大学材料学院 新型陶瓷与精细工艺国家重点实验室 北京100084 3. 金催化中心 国家催化重点实验室 中国科学院大连化学物理研究所 辽宁 大连 116023) 
关键词:镁铝尖晶石粉体 合成 非化学计量比 双金属醇盐水解溶胶–凝胶法 
分类号:TQ174.7
出版年,卷(期):页码:2019,47(3):0-0
DOI:
摘要:

 将异丙醇镁铝双金属醇盐滴加到含有5%(质量分数)EDTA分散剂的水解液中,制得镁铝氢氧化物无色透明溶胶,后经干燥、高温焙烧得到非化学计量比的铝镁尖晶石粉体。研究了Mg/Al摩尔比、焙烧温度、干燥工艺流程以及助溶剂的添加对粉体材料性能影响。结果表明:Mg/Al摩尔比在1.0:(2.5~4.0)范围内,1 200 ℃焙烧后对应粉体为纯相镁铝尖晶石结构,随铝含量增加,衍射峰向大角度方向偏移,且粉体颗粒粒径逐渐增大,MgO•1.25Al2O3粉体红外透过率较高,可潜在应用于红外隐身等材料。

 A colorless transparent sol of magnesium aluminum hydroxide was obtained via hydrolysate droplets derived from isopropanol magnesium aluminum dual-metallic alkoxide with 5% (in mass fraction) EDTA as a dispersant. Subsequently, aluminum magnesium spinel powder was prepared in a non-chemometric ratio via drying and high-temperature calcination. The influence of parameters (i.e., atom ratio of Mg and Al, calcined temperature, drying process and selected solvent) on the synthesis performance were investigated. The light permeability was detected by Fourier transform infrared spectroscopy (FTIR). The results indicate that the corresponding powder in an atom ratio range of Mg/Al from 1.0:2.5 to 1:4, calcined at 1 200 ℃ possesses a pure structure of magnesium aluminum spinel. The diffractive peaks shift to a large angle direction when the content of aluminum increases, leading to a larger crystal size. The optimal sample of MgO•1.25Al2O3 powder with a high infrared permeability could be used in infrared stealth and other materials.

 
基金项目:
国家自然科学基金(51274052)资助。
作者简介:
参考文献:

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