【摘要】 以丙烯酰胺、N,N’-亚甲基双丙烯酰胺、碳酸锂、硝酸铝和正硅酸乙酯为原料,首次采用聚丙烯酰胺凝胶法成功地制备出多组分氧化物Li2O-Al2O3-SiO2(LAS)微晶玻璃超微粉末。用TG-DTA,IR,XRD,TEM对热处理产物进行了表征。实验表明:热处理温度在800～1 000℃时,LAS凝胶粉以六方晶系的β-石英固溶体结构析出;热处理温度在1 100℃时。β-石英固溶体开始转变成稳定的四方晶系β-锂辉石固溶体,到1 209℃时已经完全转变为β-锂辉石固溶体。900～1 100℃热处理后所获得的LAS粉末晶粒大小为30～50 nm。与传统方法相比,聚丙烯酰胺凝胶法是一种在低温下廉价地快速制备多组分氧化物微晶玻璃超微粉末的理想方法。更多还原

【Abstract】 Lithium aluminosilicate(LAS)multicomponent glass-ceramic powders were prepared for the first time by using poly-acrylamide gel method and sintering at high temperature. Acrylamide, N, N’- methylene-bisacrylamide, aluminum nitrates, lithium carbonate, and tetraethoxysilane were used as precursors. X-ray powder diffraction (XRD), thermal analysis (TG and DTA) and IR spectroscopy analysis were used to characterize the product powders. Transmission electron microscope (TEM) was used to observe the microstructure of the calcined products. Results show that only β - quartz solid-solution crystallization phase is obtained when heating the dried gels from 800 ℃ to 1 000 ℃, a stable tetragonal β- spodumene solid-solution begins to appear at 1 100 ℃ and all the β- spodumene solid-solution are obtained at 1 200 ℃. The grain size of LAS powder calcined at 900-1 100℃ is about 30-50 nm. The average particle size of the powders is 30 nm with a narrow size distribution. This processing route provides the basis for a low-cost, low-temperature and time-saving method for the preparation of homogeneous ultrafine multicomponent glass-ceramic powders compared with other conventional methods.更多还原