氧化锆质定径水口在使用温度下矿物组成分析  

Analysis on the Mineral Composition of the Zirconia Metering Nozzle in Service Temperatures

作　　者：王晓[1] 薛群虎[1,2] 丁冬海[1] 赵亮[1] 周咏华[1] 

机构地区：[1]西安建筑科技大学材料与矿资学院,西安710055 [2]陕西循环经济工程学院,西安710055

出　　处：《硅酸盐通报》2016年第3期843-847,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金面上项目(51372193);陕西省自然科学基础研究计划项目资助(2014JM6224)

摘　　要：为研究连铸用氧化锆质定径水口在使用温度下矿物组成和微观结构,对以氧化镁部分稳定氧化锆(Mg-PSZ)为原料制备的定径水口产品进行模拟实验研究。实验条件为:模拟浇钢使用条件试样在1540℃×5 h后水淬冷却,模拟翻包后自然冷却条件试样在1540℃×5 h后随炉冷却。借助X-ray荧光分析仪、X-ray衍射仪、扫描电子显微镜对试样的矿物组成及显微结构进行表征。研究结果表明:以Mg-PSZ制备的氧化锆质定径水口产品在1540℃浇钢温度下矿物相以立方相为主,在翻包自然冷却过程中,缓慢的冷却速率导致部分立方相转变为单斜相,矿物相以单斜相氧化锆为主。氧化锆质定径水口产品在高温使用环境中结构均匀,平均颗粒尺寸10μm,而翻包自然冷却后,由于缓慢的冷却速率,定径水口产品中稳定剂脱溶,导致立方相转变为单斜相氧化锆,平均颗粒尺寸7μm。即通过翻包自然冷却后所取试样的研究结果不能代表氧化锆质定径水口在中间包浇注过程中实际使用状态。In order to investigate the microstructure of the zirconia metering nozzle at working environment,the paper makes a study of simulated experiment to the original Mg-PSZ metering nozzle samples. Experimental conditions： the samples were heated at 1540 ℃ for 5h before cooled,and were cooled inside the furnace or quenched in water respectively simulating the environments of the natural cooling after tilting tundish and the environment at service temperature. The chemical composition,mineral phase and micro-morphology of the samples were investigated by X-ray fluorescence instrument,X-ray diffractometer and scanning electron microscope. The study shows that the content of c-Zr O2 is higher in the original Mg-PSZ metering nozzle at 1540 ℃,however,slowly cooling rate may lead to the phase transition between c-Zr O2 and m-Zr O2 in the natural cooling after tilting tundish. The granular of the zirconia metering nozzle show uniform size and with a big particle size（ 10 μm） in service temperature,while appear many smaller particles（ 7 μm） after tilting tundish. Therefore,the research results of samples with natural cooling after tilting tundish cannot represents the actural situation of the zirconia metering nozzle at working environment.

关 键 词：定径水口 Mg-PSZ 冷却方式 

分 类 号：TQ174[化学工程—陶瓷工业]