J. Korean Ceram. Soc. > Volume 24(4); 1987 > Article
 Journal of the Korean Ceramic Society 1987;24(4): 321.
 AlF3-(Mg＋Sr＋Ba)F2-P2O5 유리에 관한 연구 제3보 : 화학적내구성 김정은, 이종근 한양대학교 무기재료공학과 Studies on AlF3-(Mg＋Sr＋Ba)F2-P2O5 Glasses III. Chemical Durability ABSTRACT The chemical durability of six alumino fluorophosphate glass samples studied. The composition of glass varied with MgF2 content from 0 to 12.5wt% in 30AlF3-2MgF2-(50-x)MF2-10P2O5(M; Sr, Ba). Samples were maintained in distilled water at 95$^{circ}C$ from 1 to 100hrs. Weight loss, pH change and leached elements of the solution, and IR transmittance of samples were measured and also their surfaces were observed by SEM. Chemical durabilities of these samples were increased with increasing MgF2 contents. The following various properties were increased rapidly up to 10 hours after that changed slowly. The sample after leached at 95$^{circ}C$ during 100 hrs showed 0.5mg/$textrm{cm}^2$ in weight loss. The pH of leached solution is 6.2 and concentration of Mg, Sr, and Ba element of that leached solution were 24,115 and 125 ppm, respectively. The infrared transmittance of leached sample decreased 7% compare to unleached one. And also SEM photomicrograph and EDS analysis showed that the corrosion of samples were decreased with respect to increasing MgF2 content.
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