反应温度与反应气氛对固相合成ZrSiO4的影响  

Effect of reaction temperature and reaction atmosphere on the synthesis of ZrSiO4

作　　者：宋可琪 范景莲[1] 成会朝[1] 刘涛[1] 韩勇[1] SONG Keqi;FAN Jinglian;CHENG Huichao;LIU Tao;HAN Yong(State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)

机构地区：[1]中南大学粉末冶金国家重点实验室

出　　处：《粉末冶金材料科学与工程》2019年第4期379-384,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51534009)

摘　　要：以纳米ZrO2粉末和纳米非晶SiO2粉末为原料,通过固相反应合成ZrSiO4,研究在空气气氛下该反应发生的最低温度和ZrSiO4合成量最高的温度,反应气氛(真空和空气)对ZrSiO4合成的影响以及ZrSiO4的微观组织结构。结果表明:在空气气氛下,反应时间为4h时,ZrSiO4的最低合成温度为1225℃;当反应时间延长至8h时,ZrSiO4的最低合成温度降至1200℃。空气气氛中的氧气可促进非晶SiO2向方石英转化,从而使得在1300℃以上ZrSiO4的合成量迅速增多。在真空环境下,非晶SiO2在高温下包裹在ZrO2颗粒表面,阻碍ZrO2颗粒长大,有助于得到细小的ZrSiO4晶粒。ZrSiO4 was synthesized from nanosized ZrO2 powders and nanosized amorphous SiO2 powders by solid-state reaction. The initial reaction temperature and the temperature at the highest yield in air, the effect of the reaction atmosphere vacuum and air on the synthesis of ZrSiO4 and corresponding microstructure were studied. The results show that the initial reaction temperature of ZrSiO4 can be as low as 1 225 ℃ when the reaction time is 4 h in air atmosphere. When holding time is extended to 8 h, the initial reaction temperature of ZrSiO4 synthesis can be further reduced to 1 200 ℃. When synthesized in air, oxygen promotes the transformation of amorphous SiO2 to cristobalite, which makes the formations of ZrSiO4 increase rapidly above 1 300 ℃. When synthesized in vacuum, because amorphous SiO2 is wrapped on the surface of ZrO2 particle at high temperature, it is helpful to obtain fine ZrSiO4 grains by blocking the growth of ZrO2 particles.

关 键 词：ZRSIO4 固相反应 反应气氛 合成温度 显微组织 

分 类 号：TQ175.75[化学工程—硅酸盐工业]