Research on Large Size and Mid-Infrared Transparent Oxyfluoride Optical Glass

红外光学玻璃是很多重要军、民用系统的关键窗口材料之一，但其高性能化、大尺寸化制备面临重要挑战。针对氟化物玻璃易挥发、抗析晶性能较差等特点，通过向含TeO_2的氟铝酸盐玻璃中引入碱土金属氧化物BaO，显著降低了玻璃在熔制中的挥发，同时提高了玻璃的热稳定性。通过Raman光谱的分析，发现BaO的增加抑制了富TeO_2玻璃分相，有利于碲酸盐玻璃与氟铝酸盐玻璃之间的融合，促进了玻璃网络结构的稳定。所得的氧氟化物红外光学玻璃有优异的红外透射性能，和氟化钙晶体性能对比，显示出低成本优势和更强的环境适应性。Infrared glasses are one of the key window materials of military and civil systems, gaining the high properties and large size glass is also a big challenge to it. BaO is introduced into TeO_2 containing fluoroaluminate glass, because of its evaporation and devitrification tendency, and it is found that BaO significantly reduce the evaporation during melting process, and improve the thermal stability of glass. The Raman spectra show that BaO can inhibit the separation of rich TeO_2 glass phase, and is conducive to the harmonious fusion of tellurite and fluoride glass, promoting the stability of the glass network. The obtained glass has excellent comprehensive properties, as well as cheaper and higher adaptability than CaF_2 crystal