Properties of Li_2O-ZnO-Al_2O_3-SiO_2 glass-ceramic system prepared by spray pyrolysis(<Feature>Aqueous Solution Science for Ceramic Processing II)

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Li_2O-ZnO-Al_2O_3-SiO_2 (LZAS) glass-ceramic system was studied in the high temperature spray pyrolysis. Small amount of P_2O_5 was used as nucleation agent. Fine-sized Li_2O-ZnO-Al_2O_3-SiO_2 glass powders with amorphous phase and spherical shape were formed by spray pyrolysis at temperatures between 1300 and 1500℃. The mean size of the glass powders prepared at a temperature of 1500℃ was 0.7μm. The glass transition temperature (T_g) of the glass powders was 551.2℃. The two crystallization exothermic peaks were observed at 703.8 and 923.8℃. Densifications of specimens occurred at sintering temperatures of 800 and 900℃, in which interconnected network microstructure was formed by tiny dendritic crystals. The specimens sintered at temperatures of 600 and 700℃ had LiAl(SiO_3)_2 crystal structure. On the other hand, the specimens sintered at temperatures between 800 and 1000℃ had LiAlSi_2O_6 (β-spodumene) crystal structure.
社団法人日本セラミックス協会の論文
2009-03-01