几种纳米氧化铝的红外消光性能研究

Infrared Extinction Characteristic of Nanometer Aluminas

利用傅里叶变换红外光谱仪在中型烟幕试验柜中,对八种α型和γ型纳米氧化铝粉体气溶胶在3～5 μm与8～14 μm波段的红外消光特性进行了测试对比.利用KBr压片法测试了样品的红外光谱,给出了样品的晶型、平均粒度和比表面积等特征数据.实验结果表明,纳米氧化铝对红外具有良好的消光作用.纳米氧化铝气溶胶在3～5 μm和8～14 μm波段的最大质量消光系数分别为1.798 m2·g-1和1.940 m2·g-1;γ型纳米氧化铝的红外平均透过率普遍小于α型;比表面积越大、纳米氧化铝粒子平均直径越小对红外的消光性能就越显著.

The characteristic of infrared extinction for 8 species of a and γ-nanometer aluminas was studied by dispersing in a smoke chamber and pressing potassium bromide tablet with a Fourier Transform Infrared Spectrometer. The results show that nanometer alumina possesses a good infrared extinction characteristic, and the maximum mass extinction coefficients of nanometer alumina aerosols are 1.798 m^2 · g^-1 and 1. 940 m^2· g^-1 in 3 -5 μm and 8 - 14 μm bands. Moreover,the infrared transmission rates of T-nanometer alumina are lower than that of α-nanometer alumina ,and the infrared extinction of nanometer alumina is enhanced when the specific area increases or diameter decreases.