采用一步烧结法的钢渣基微晶玻璃制备机理  

Preparation Mechanism of Glass-ceramics Based on Steel Slag Using One-step Sintering Process

作　　者：赵贵州 李宇[1,2] 代文彬[1,2] 苍大强[1,2] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《硅酸盐通报》2014年第12期3288-3294,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金重点项目(51034008);钢铁冶金新技术国家重点实验室(北京科技大学)自主研发基金(41602011)

摘　　要：以转炉钢渣作为主要原料,对钢渣熔融还原提铁后的二次渣采用一步法热处理工艺,制备出了碱度(Ca O与Si O2的质量比)分别为0.5、0.6、0.7的钢渣微晶玻璃。通过X射线衍射分析(XRD)、扫描电镜(SEM)和力学性能测试等手段,研究了不同热处理温度和时间对微晶玻璃结构和性能的影响规律。研究表明,随着基础玻璃碱度的提高,微晶玻璃的主晶相由辉石转变为钙铝黄长石;随着烧结温度逐渐升高,微晶玻璃抗折强度也逐渐升高,但不宜超过1100℃;在1100℃下,保温时间的变化对微晶玻璃的性能和微观组织的影响较小;碱度为0.7的微晶玻璃力学性能优异,在1100℃晶化20 min其内部的晶体呈方柱状交织排列,构成晶体骨架并分布在残余的玻璃基体中,从而使其具有优异的力学性能;采用一步法工艺,可减少改质剂使用量及热处理时间,具有较好的应用前景。Using steel slag as raw material,glass-ceramics with the basicity（ wt% Ca O / wt% Si O2） of 0.5,0. 6 and 0. 7 were prepared using one-stepsintering process. Their structure and properties were studied by means of X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）,and mechanical strength testing. The results show that the main crystalline phase of glass ceramics transformed from augite to gehlenite with increasing basicity. Increasing the sintering temperature of glass-ceramics is beneficial to the improvement of the bending strength of glass-ceramics. The increase of the holding time of crystallization have tiny impact on the glass-ceramics at 1100 ℃,the best holding time is different with different basicity. The glass-ceramics with the basicity of 0. 7 crystalized at 1100 ℃ has excellent mechanical properties,in which gehlenite crystallization performs columnar interwoven constituting a crystal skeleton that forms the microstructure with residual glass phase. Using one-step process is beneficial to improve the basicity of glass-ceramics,and also the use of modification agent and heat treatment time can be reduced,which is good for industrial application.

关 键 词：钢渣 一步烧结法 微晶玻璃 力学性能 

分 类 号：TQ171.733[化学工程—玻璃工业]