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无机材料学报

无机材料学报

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PbI2-PbCl2-KCl系统玻璃的形成及其析晶行为研究

金政武; 程继健   

  1. 华东理工大学无机材料系; 上海200237
  • 收稿日期:1995-07-24 修回日期:1995-10-09 出版日期:1997-02-20 网络出版日期:1997-02-20

Formation and Crystallization Behavior of the Ternary PbI2-PbCl2-KCl Glass

JIN Zhengwu; CHENG Jijian   

  1. Department of InorganicMaterials; East China University of Science and Technology Shanghai 200237 china
  • Received:1995-07-24 Revised:1995-10-09 Published:1997-02-20 Online:1997-02-20

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摘要： 本文从阳离子的配位数、化学键的特性等角度出发，探讨了PbI2－PbCl2－KCl三元系统的玻璃形成特性.并以DSC、SEM和XRD等为手段研究了组成为50PhI230PbCl220lKCl（mol％）的玻璃的析晶行为.析晶动力学研究表明，所得玻璃的高、低温相变机理彼此不同.所得玻璃的析晶活化能接近于较稳定的氟锆酸盐玻璃，因此在析晶温度下表现出了较慢的析晶速率.通过适当的热处理;可以获得红外透过性能与原始玻璃一致的微晶玻璃，这种微晶化可大幅度地提高玻璃的显微硬度.加之，所得玻璃本身就具有良好的化学稳定性和优良的红外透过性能，因此有望以所得三元系统为基础，开发出一类具有实用价值的透红外玻璃材料.

关键词: 非氟卤化物玻璃, 透红外材料, 玻璃制备, 玻璃形成行为, 晶化机理, 力学性能

Abstract: The glass formation bellavior of PbI2-PbCl2-KCl system was discussed in the view of coordination number and characteristics of chemical bonds. The crystallization behavior of 50PbI2·30PbCl2·20KC1(mol%) glass was investigated by means of DSC, SEM and XRD. The kinetic parameters of crystallization of the glass wcrc deternnnnned by nonisothermal methods. The results showed that the crystallization mechanisms corresponding respectively to two crystallization peaks in the DSC curve were different. The low crystallization rates at crystallization temperatures were attributed to high apparent activation energies, closing to the values obtained from the relatively stable fluorozirconate glass. It was found that the IR transmitting property of the glass-ceramic obtained under suitable heat treatment conditions was consistert with that of the original glass. The microhardness of the glass-ceramic could also be greatly improved. Moreover, the glass synthesized in this work had good chemical durability and excellent IR transmitting properties, so multicomponent galss based on our ternary system could be developed as one of promising materials for IR transmission.

Key words: non-fluoride halde glass, IR transmitting materials, the preparation of glasses, glass formation behavior, crystallization Inechanisms, mechanical properties