关键词: La2 O3;耐碱性能;弹性模量;析晶上限温度

Abstract: The SiO2-Al2 O3-CaO-MgO glasses were prepared by high temperature melting method. The effects of La2 O3 content on the density, resistance to alkali, elastic modulus and the upper limit of crystallization temperature of SiO2-Al2 O3-CaO-MgO glasses were studied, and then the structure of glass was characterized by FT-IR Spectrometer. With the increasing of La2 O3 from 0 to 5wt%, the glass network changed, the density and molar volume of glass increased, while, alkali resistance of the glass decreased. The elastic modulus of glass increased from 90. 5 GPa to 93. 6 GPa when the La2 O3 content varied from 0 to 5wt%, then decreased. The La2 O3 content of the maximum elastic modulus value was 3 wt%. The upper limit of crystallization temperature decreased from 1224 ℃ to 1209 ℃, then increased to be a constant at 1212 ℃. The La2 O3 content was 2wt% when the temperature was lowest.

Key words: La2 O3;resistance to alkali;elastic modulus;upper limit of crystallization temperature