Al2O3-ZrO2-SiO2系相关系的再研究  

Phase relationship of Al2O3-ZrO2-SiO2 system

作　　者：高振昕[1,2] Gao Zhenxin(Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,Henan,China)

机构地区：[1]中钢集团洛阳耐火材料研究院有限公司 [2]濮阳濮耐高温材料(集团)股份有限公司北京科技研发中心

出　　处：《耐火材料》2019年第3期161-165,共5页Refractories

摘　　要：借助高分辨力FESEM-EDS重新研究了Al2O3-ZrO2-SiO2系相关系。研究结果认为:1.在A-Z-M分系的ZrO2含量(w)分别为30.00%和33.26%,Al2O3、SiO2物质的量比分别为1.50和1.75的2个试样中,没有发现莫来石-刚玉-ZrO2三元共晶,只发现莫来石-ZrO2(M+Z)二元共晶;(M+Z)共晶在形态上保持莫来石基晶的结晶习性,呈微米级共晶和纳米级共晶。2)在组成落在ZS-M连线上,Al2O3、SiO2物质的量比分别为0.26、0.59、0.80、1.10的4个试样中,均没有发现锆英石晶相,均有初晶ZrO2、莫来石和玻璃相;随着Al2O3、SiO2物质的量比增大,莫来石增多、增大,并且出现少量的(M+Z)共晶,玻璃相中析出纳米级t-ZrO2晶。3)M-ZS-S分系的SiO2含量为90%(w)的试样在1600℃保温3h热处理条件下均熔,自然冷凝后呈玻璃态,并发生纳米-亚微米级t-ZrO2析晶;没有发现所谓的锆英石-莫来石-方石英三元共晶。By means of high resolution FESEM - EDS,the phase relationship of the Al 2O 3 - ZrO 2 - SiO 2 system was restudied.The results show that:(1)in the two samples of the A - Z - M subsystem with ZrO 2 content of 30.00 mass % and 33.26 mass % and the Al 2O 3 and SiO 2 molar ratio of 1.50 and 1.75,no mullite - corundum - ZrO 2 ternary eutectic is found and only mullite - ZrO 2(M+Z) binary eutectic is found;(M+Z) eutectic follows the crystallization habit of mullite-based crystals in morphology,showing micron-eutectic and nano-eutectic;(2)in the 4 samples with the Al 2O 3 and SiO 2 molar ratios of 0.26,0.59,0.80 and 1.10,whose composition is in the ZS - M line,no zircon crystals are found,while primary ZrO 2 crystals,mullite and glass phase are observed;with the increase of the molar ratio of Al 2O 3 and SiO 2,mullite crystals increase and grow,a small amount of (M+Z) eutectic appears,and nano t-ZrO 2 crystallizes from the glass phase;(3)the sample with SiO 2 content of 90 mass % in the M - ZS - S subsystem melts uniformly at 1 600 ℃ for 3 h;after natural condensation the sample transforms into glass state and t-ZrO 2 crystallization occurs at nano-submicron level;no so-called zircon - mullite - cristobalite ternary eutectic is found.

关 键 词：Al2O3-ZrO2-SiO2系相图 高分辨力FESEM 显微结构 三元共晶 玻璃相 

分 类 号：TQ175[化学工程—硅酸盐工业]