Performance Research of the Smart Materials of Laser Stealth from Phosphate-Based Minerals
In order to improve the anti-laser damage performance of aircraft,an intelligent high-energy laser protective material based on the principle of phase transformation was developed.Based on the absorption of infrared light from 1050 nm to 1150 nm by Sm,the SmPO4·nH2O rhab-dophane powders were prepared by using chemical precipitation.The laser stealth and protective properties of SmPO4·nH2O and its thermal phase transformation at 1064 nm were studied.The results showed that SmPO4·nH2O prepared by the hydrothermal synthesis at 14 d had a good laser stealth performance,and its reflecture at about 1080 nm was 43.8％.For SmPO4·nH2O prepared at 1～7 d,the tiny grain absorption cross section ratio had been evidenced as serious grain agglomeration phenomenon.SmPO4·0.667H2O had a good reversibility of dehydration-adsorption and structural stability,which could be completely dehydrated at approximate 250℃ then transformed into SmPO4 monazite(thermal barrier coating materials)at approximate 842℃.In addition,the reflectance of SmPO4 monazite powder at 1064 nm reached 70.9％,which indicated that SmPO4 could realize the reflectance transformation through crystal transformation.The SmPO4·nH2O rhabdophane could be proposed as a new intelligent laser stealth and thermal protec-tion material for the substitute of VO2.
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