熔融温度对透辉石结晶生长的影响  

Effect of Melting Temperature on the Crystal Growth of Diopside

作　　者：常卓雅 黄菲[1] 张志彬[1] 王鑫宇 闻昕宇 宋贵常 李明宇 CHANG Zhuoya;HUANG Fei;ZHANG Zhibin;WANG Xinyu;WEN Xinyu;SONG Guichang;LI Mingyu(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,Liaoning,China;Hebei Chongli Zijin mining co.LTD,Zhangjiakou,075000,Hebei,China;Professional Technology Innovation Center for Comprehensive Utilization of Iron Ore Resources,Chaoyang,122400,Liaoning,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]河北崇礼紫金矿业有限责任公司,河北张家口075000 [3]铁矿石资源综合利用专业技术创新中心,辽宁朝阳122400

出　　处：《陶瓷学报》2021年第6期977-983,共7页Journal of Ceramics

基　　金：国家重点研发计划(2018YFC1901903);河北省创新能力提升计划项目(JCY-CB-2019-088);科技部科技兴辽计划项目(02070076119008)。

摘　　要：透辉石陶瓷材料具有良好的机械性能和化学性能,已被广泛应用于建筑陶瓷、日用陶瓷、微晶玻璃等领域。系统研究透辉石结晶生长过程的影响因素,可为透辉石陶瓷材料的加工、工艺设计和应用提供结晶机制的理论依据。以天然岩石为原料,采用熔融法制备透辉石晶体,研究熔融温度对透辉石生长机制的影响。运用X射线衍射仪(XRD)、场发射电子探针(EPMA)、差热分析仪(DSC)等方法,研究分析了不同熔融温度下透辉石的结晶生长过程。结果表明:熔融温度在1210℃~1250℃内,随着温度的升高,透辉石的微观形貌存在明显差异,主要表现为晶体形态逐渐由骸晶发育成枝晶,自形程度呈半自形向自形变化。当熔融温度为1230℃时,透辉石的晶体形态呈现不同的演化趋势,这是因为生长过程中溶质在熔体内富集不均匀,柱状透辉石晶面失稳,生成胞状界面并沿失稳界面生长,最终形成树枝状枝晶。Diopside ceramic material has good mechanical and chemical properties,has been widely used in building ceramics,daily ceramics,glass-ceramics and other fields.Systematic study of the factors affecting the crystallization and growth of diopside can provide a theoretical basis for the crystallization mechanism of diopside ceramic materials for processing,technological design and application.Diopside crystals were prepared from natural rocks by melting method.The effect of melting temperature on the growth mechanism of diopside was studied.X-ray diffraction(XRD),field emission electron probe microanalysis(EPMA)and differential scanning calorimetry(DSC)were used to study the crystal growth process of diopside at different melting temperatures.The results show that the microstructure of diopside is different with the increasing of melting temperature in the range of 1210~1250℃.The morphology of diopside gradually develops from skeleton crystal to dendrite,and the degree of automorphism changes from semi-autogenous to autogenous.When the melting temperature is 1230℃,the crystal morphology of diopside shows different evolution trend,this is because the solute enrichment in the melt is not uniform during the growth process,columnar diopside crystal surface instability,the formation of cellular interface and growth along the unstable interface,and finally the formation of dendrite.

关 键 词：熔融温度 透辉石 结晶生长 

分 类 号：TQ174.75[化学工程—陶瓷工业]