DTAによるLi_2O-SiO_2系ガラスの核生成挙動の評価(<特集>セラミック材料)

概要

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Li_2O-SiO_2 glasses were heat-treated under various conditions for nucleation and were employed for DTA measurement to evaluate their nucleation behavior. Crystallization peak temperature, T_C of 33Li_2O-67SiO_2 and 30Li_2O-70SiO_2 glasses showed a minimum at 460℃ and it is found that T_C is a good measure for the number density of nuclei. On the other hand, T_C of 40Li_2O・60SiO_2 and 36Li_2O・64SiO_2 glasses did not show a minimum because the growth rate of crystal during the heat-treatment was so large at temperatures above 460℃ that T_C tended to decrease. In order to evaluate the nucleation behavior quantitatively from T_C, the relationship between T_C and the number density of nuclei in 33Li_2O・67SiO_2 glass which had been heat-treated for various lengths of time at different temperatures was obtained. A single correlation curve was obtained between T_C and the number density of nuclei. Using this relationship, variation of the number density of nuclei for 33Li_2O-67SiO_2 glass with heat-treatment time at a given temperature (460℃) can be evaluated.
社団法人日本材料学会の論文
2001-06-15