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Citation: YANG Fan, DENG Jian-Cheng, YU Gui-Hong, XU Jing-Wei. Effects of Silicate Droplets in Glass Powder on Compressive Strength of Glass Ionomer Cement[J]. Chinese Journal of Applied Chemistry, ;2009, 26(2): 210-213. shu

Effects of Silicate Droplets in Glass Powder on Compressive Strength of Glass Ionomer Cement

1.
a MOE Key Laboratory of Environmental Friendly Chemistry and Applications, College of Chemistry, Xiangtan University, Xiangtan 411105;
2.
b Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun

Corresponding author: DENG Jian-Cheng,
Received Date: 1 February 2008
Available Online: 30 May 2008

Silicate glass powder was prepared from SiO₂,Al2O3,CaF2,AlF3,NaAlF4 and AlPO4 under different fusing and cooling conditions.Environmental scanning electron microscopy(ESEM) was used to study the effect of silicate droplets in the glass powder on the mechanical properties of the glass ionomer cement(GIC).When the fusing mixture was cooled rapidly,the glass powder became phase separated and the silicate droplets were produced,which were the active phase in the setting reaction of the GIC and were composed of CaF₂.When the fusing temperature was too low or the fusing time too short,the droplets were not produced completely.In contrast,the droplets were very small and easy to separate from the matrix.Two cases of both will result in low compressive strength of the GIC.To obtain GIC with good mechanical property,the glass powder must be cooled rapidly at 1 200 ℃ for 2 h.
- silicate glass powder,
- glass ionomer cement,
- ESEM,
- droplet
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