铝矾土合成MgAl_(2)O_(4)-CaAl_(12)O_(19)复合材料的烧结性能和力学性能研究  

Sintering Behaviors and Mechanical Properties of MgAl_(2)O_(4)-CaAl_(12)O_(19)Composites from Bauxite

作　　者：王晓军[1] 严霞 刘艳娥[1] 王玲[1] 苏廷龙 田玉明[3] WANG Xiaojun;YAN Xia;LIU Yan'e;WANG Ling;SU Tinglong;TIAN Yuming(Department of Physics and Electronic Information Engineering,Lyuliang University,Lvliang 033001,Shanxi,China;Xiaoyi King Kong Refractory Co.,Ltd,Lvliang 032200,Shanxi,China;School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]吕梁学院物理与电子信息工程系,山西吕梁033001 [2]孝义市金刚耐火材料有限公司,山西吕梁032200 [3]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《陶瓷学报》2024年第5期977-984,共8页Journal of Ceramics

基　　金：吕梁市高层次科技人才项目(2022RC14);吕梁市高层次科技人才项目(2022RC12);山西省基础研究项目(202103021224318);国家自然科学基金(61705176);吕梁学院青年学术骨干项目。

摘　　要：MgAl_(2)O_(4)-CaAl_(12)O_(19)复合材料因具有优异的性能,被应用于一些特殊的高温行业中,并引起了人们的广泛关注。研究选取原矿粉铝矾土、白云石和菱镁矿为原料,采用固相烧结工艺在1100℃~1500℃保温2 h后,获得了MgAl_(2)O_(4)-CaAl_(12)O_(19)复合陶瓷材料,研究了铝矾土的含量和烧成温度对其物相组成、微观结构和力学性能的影响。研究发现:经1500℃烧结2 h后的试样烧结性能较好,铝矾土用量最大为90.3 wt.%,此时试样的致密性能最佳,其体积密度为2.68 g·cm^(-3),显气孔率为11%。在经1500℃烧结得到的试样力学性能最优,当MgAl_(2)O_(4)和CaAl_(12)O_(19)的质量比达到1.82时,试样的抗折强度最大为113.63 MPa。MgAl_(2)O_(4)-CaAl_(12)O_(19)composites have attracted much attention because of their excellent properties,which have applications in some special high-temperature industries.In this paper,with ore powders of bauxite,dolomite and magnesite as raw materials,MgAl_(2)O_(4)-CaAl_(12)O_(19)composites were obtained by using solid-phase sintering process at 1100-1500℃for 2 h.The effects of the content of bauxite and sintering temperature on phase composition,microstructure and mechanical properties of the composites were studied.The optimal densification was observed when the sintering temperature was 1500℃and the bauxite content was the largest,with a bulk density of 2.68 g·cm^(−3)and an apparent porosity of 11%.The corresponding flexural strength was 113.63 MPa,when the mass ratio of MgAl_(2)O_(4)and CaAl_(12)O_(19)was 1.82.

关 键 词：铝矾土 复合材料 六铝酸钙 物相组成 力学性能 固溶体 

分 类 号：TQ174.75[化学工程—陶瓷工业]