2MgO·TiO_2的固相反应合成与烧结  

Solid-state reaction synthesis and sintering of 2MgO·TiO_2

作　　者：蔡斌利[1,2] 蒋明学[1] 

机构地区：[1]西安建筑科技大学材料科学与工程学院,陕西西安710055 [2]中钢集团耐火材料有限公司,河南洛阳471039

出　　处：《耐火材料》2009年第5期346-349,共4页Refractories

摘　　要：在2MgO·TiO2的热力学计算基础上，将97电熔镁砂（〈0．088mm）和钛白粉（〈0．044mm）按n（MgO）：n（TiO2）=2：1的配比共磨并预烧（1000℃保温3h）后，将预烧料破碎并预压造粒，成型为Ф44mm×44mm的试样，然后在1250～1700℃（间隔50℃）共10个温度点下分别煅烧5h。对煅烧后的试样进行XRD和SEM分析以及显气孔率、体积密度、常温耐压强度的测定，在此基础上研究了2MgO·TiO2的合成与烧结。结果表明：以97电熔镁砂和钛白粉为原料，按n（MgO）：n（TiO2）=2：1配料，在1400℃保温5h就可以合成高含量的2MgO·TiO2，但合成2MgO·TiO2的烧结温度应控制在1650℃保温5h。Based on the thermodynamics calculation of 2MgO · TiO2,97 fused magnesite （ 〈0. 088 mm） and titanium dioxide mixture （ 〈0. 044 mm） with molar ratio of 2 ： 1 was prepared. After ball milling and pre-sintering （ 1000 ℃ for 3 h） ,the mixture was crushed and pressed into cylindrical specimens with size of Ф44 mm × 44 mm. The specimens were then fired at 1250 - 1700 ℃with an interval of 50 ℃ for 5 h, respectively. The synthesis and sintering of 2MgO·TiO2 were studied by analyzing XRD, SEM, porosity, bulk density and cold crushing strength of the fired specimens. The results showed that.high content 2MgO·TiO2 could be synthesized using 97 fused magnesite and titanium dioxide as starting materials with the mixing molar ratio of 2：1,holding at t 400 ℃ for 5 h;while the sintering temperature of 2MgO·TiO2 should be controlled at 1 650℃ for 5 h.

关 键 词：正钛酸镁 固相反应 烧结 煅烧温度 

分 类 号：TQ174.758[化学工程—陶瓷工业] TM911.4[化学工程—硅酸盐工业]