无机材料学报

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可控释放磷酸盐玻璃表面形貌与水溶解过程

汪山; 程继健   

  1. 华东理工大学无机材料研究所, 上海 200237
  • 收稿日期:2000-04-07 修回日期:2000-06-22 出版日期:2001-03-20 网络出版日期:2001-03-20

Surface Morphology and Dissolution Process of Controlled Release Phosphate Glass in Deionised Water

WANG Shan, CHENG Ji-Jian   

  1. Research Institute of Inorganic Materials; East China University of Science and Technology; Shanghai 200237; China
  • Received:2000-04-07 Revised:2000-06-22 Published:2001-03-20 Online:2001-03-20

摘要: 对不同原始形貌的25NaO-25CaO-50P玻璃采用表面失重法对水溶解过程进行了分析,试验结果表明:玻璃的溶解分扩散和线性溶解两个阶段,在扩散阶段玻璃的失重与时间的开方呈线性关系,随后玻璃进入线性释放阶段.对玻璃表面形貌的变化的研究表明:玻璃的的原始形貌对玻璃的溶解过程有很大的影响,玻璃表面形貌的变化呈现出与玻璃溶解速度相对应的侵蚀坑的初步形成阶段和侵蚀坑的稳定阶段.

关键词: 磷酸盐玻璃, 控释, 形貌

Abstract: The dissolution process of the 25Na2O-25CaO-50P2O5 glass with different initial surfaces
was analyzed with the help of the surface weight loss and the morphology of the glass surface. The experiment of weight loss of the glass shows that
the dissolution process of the glass has two stages. the first stage, diffusion stage, at which the weight loss of the glass is proportional
to the square root of the dissolution time; the second stage, linear dissolution stage, at which the weight loss of the glass is in direct
proportion to the dissolution time. During the dissolution process of the glass, The etched pit forming stage and the etched pit stable stage were
observed, and these two stages agree with the two stages of the weight loss. The results also demonstrate that the initial surface of the glass has
remarkable effect on the dissolution process of the glass.

Key words: phosphate glass, controlled release, morphology

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