OXIDATION-REDUCTION EQUILIBRIUM IN COPPER PHOSPHATE-GLASS MELTED IN AIR

被引:71
作者
BAE, BS
WEINBERG, MC
机构
[1] Arizona Materials Laboratories, Department of Materials Science and Engineering, University of Arizona, Tucson, Arizona
关键词
GLASS; COPPER; PHOSPHATES; REDUCTION-OXIDATION; EQUILIBRIUM;
D O I
10.1111/j.1151-2916.1991.tb04299.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Copper phosphate glasses with 40, 50, and 60 mol% CuO in batch were melted in air at 1000-degrees, 1100-degrees, and 1200-degrees-C using quartz or alumina crucibles, and the [Cu2+]/[Cu(total)] ratio variations with melting time were measured. Glasses were oxidized during melting and reached equilibrium [Cu2+]/[Cu(total)] ratios which were independent of melting temperature and identical for the 40 and 50 mol% CuO content glasses. Structural considerations seemed to have determined oxidation-reduction equilibrium rather than an equilibrium redox reaction. Also, the effects of crucible type on the oxidation-reduction balance were examined. It was found that a quartz crucible is more inert and has less effect on the oxidation-reduction equilibrium of glass than an alumina crucible. Crucible contamination and phosphorus vaporization were found to diminish as the CuO content in the batch was increased.
引用
收藏
页码:3039 / 3045
页数:7
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