摘要
研究了不同Al2O3/P2O3摩尔比和热历史的ZnO-Al2O3-P2O5玻璃在不同条件下的水化过程,利用XRD对部分水化过程的水化产物进行了晶相分析,探讨了其水化机理.结果表明:Al2O3/P2Os比的增加及退火均可降低ZnO-Al2O3-P2O5玻璃的水化速率;玻璃的水化累计失重量均与水化时间成线性关系,水失重百分数随着水化温度的提高,呈指数规律增加.研究认为:ZnO-Al2O3-P2O5玻璃的水化过程受表面水化层与内部未水化部分间的界面化学反应控制,水化过程中玻璃网络解体,相继生成了[P2O7]4-和白色不溶性物质Zn2P2O7·3H2O.
The hydration process of ZnO - A12O3 -P2O5 glasses with increasing A12O3/P2O5 molar ratios and different thermal histories is studied in detail. A mechanism of the hydration is proposed directly from the experimental observation and results. Gravimetrical analysis was performed on the hydrated samples in order to determine the hydration rate of glasses. The results show that an increase of A12O3/P2O5 molar ratio as well as the annealing process results in a decrease of the hydration rate of the glasses; the linear relationship between the weight loss percentage (△W) and hydration time is found.△W increases exponentially with increasing hydration temperature. It comes to the conclusion that an interface reaction mechanism controls the hydration process. The disintegration of the glass network and the formation of [P2O7]4- species are followed by the for-maiton of insoluable white hydration products Zn2P2O7·3H2O during the hydration process.
出处
《材料科学与工艺》
EI
CAS
CSCD
2002年第3期322-325,共4页
Materials Science and Technology
