基于含Y2O3和ZrO2的钠铝硅玻璃体系,研究了玻璃组分中Al2O3/Na2O摩尔比值(MAN)与SiO2/Al2O3摩尔比值(MSA)对玻璃析晶性能的影响.研究结果表明,当MAN<1时,玻璃经热处理后表面析出钠霞石晶体;当MAN≥1时,玻璃热处理后析出钇锆酸盐纳米晶体,且此时微晶玻璃仍然具有不小于90%的高可见光透过率.对于固定MAN的玻璃,调整其MSA也能实现钇锆酸盐纳米晶的析出,且析出晶体尺寸随MSA增加而减小.随着热处理温度升高微晶玻璃样品中纳米晶体尺寸增大,维氏硬度也增大.
The influences of the molar ratios of Al2O3/Na2O(MAN)and SiO2/Al2O3(MSA)on the crystallization properties of the glass were studied in this work based on the sodium-aluminum-silicate glass system containing Y2O3 and ZrO2.The results show that,when MAN<1,sodium nepheline crystals precipitate on the surface of the glass after heat treatment.When MAN>1,yttrium zirconate nanocrystals can be formed in the whole bulk glass,and the glass-ceramics can maintain a high visible light transmittance of 90%.For glass with fixed MAN,adjusting its MSA can also achieve the precipitation of yttrium zirconate nanocrystals,and the size of the precipitated crystals decreases as MSA increases.Furthermore,as the heat treatment temperature rises,the size of nanocrystals in glass-ceramic nanocrystals as well as Vickers hardness increases.