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基于气动悬浮激光加热技术YAG熔体高温热物理性能评测 预览

Thermo-physical Property of YAG Melt Measured by Aerodynamic Levitation Technique
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摘要 钇铝石榴石Y3Al5O12(YttriumAluminumGarnet,简记为YAG)材料具有优异的光、热和电学性能,引起了广泛关注。但高熔点和冷却过程中复杂的相选择机制,使YAG熔体特别是熔点以下过冷区内的热物理性能参数获得困难。利用自主搭建的气动悬浮无容器激光加热装置,基于受迫振动和光学描影等原理,在1750~2650K宽达900K的温区内,评测了YAG熔体的黏度、表面张力和密度。研究表明,与Al2O3熔体相比,YAG熔体密度具有更高的温度敏感性,具有高约1倍的平均线膨胀系数;不同于表面张力随温度变化不敏感的Al2O3熔体,YAG熔体的表面张力随温度升高产生略微降低;与Al2O3熔体的黏温关系相比,在熔点以下的过冷区内发现YAG熔体具有更陡峭的黏温变化趋势。 As one of the most widely used oxide in many fields, Y 3 Al 5 O 12 (YAG: Yttrium Aluminum Garnet) has attracted extensive attention. However, due to its high melting point and complex mechanism for phase selection, accurate knowledge of thermo-physical properties for YAG melt, is much desired. Using an advanced aerodynamic levitation laser-melting technique, here the viscosity, surface tension and density were carefully evaluated on both thermodynamically stable, and metastable supercooled YAG melts in the temperature scope from 1750 K to 2650 K. The results indicate that density of YAG melts has a higher sensitivity than that of Al 2 O 3 melts upon temperature change; and YAG melts have one time higher average line thermal expansion coefficient compared to the Al 2 O 3 melts. Al 2 O 3 melts’ surface tension is almost constant on temperature in the wide temperature scope, while YAG melts have a distinct decrease in surface tension following temperature increase. As to the viscosity-temperature relation, in the supercooled scope, YAG melts have a more obvious rise in viscosity upon cooling.
作者 丰盛 单志涛 潘瑞琨 徐博 祖成奎 陶海征 FENG Sheng;SHAN Zhi-Tao;PAN Rui-Kun;XU Bo;ZU Cheng-Kui;TAO Hai-Zheng(State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;China Building Material Academy, Beijing 100024, China)
出处 《无机材料学报》 CSCD 北大核心 2018年第12期1297-1302,共6页 Journal of Inorganic Materials
基金 国家自然科学基金(51772223) 湖北省重大专项项目(2016AAA029).
关键词 高温热物理性质 YAG 气动悬浮技术 过冷区 thermo-physical property yttrium aluminum garnet aerodynamic levitation technique supercooled region
作者简介 丰盛(1994-), 男, 硕士研究生. E-mail: fancy_fs@whut.edu.cn;通讯作者:陶海征, 教授. E-mail: thz@whut.edu.cn
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