Thermo-physical Property of YAG Melt Measured by Aerodynamic Levitation Technique

doi:10.15541/jim20180104

Abstract

Abstract:

As one of the most widely used oxide in many fields, Y₃Al₅O₁₂(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 Al₂O₃ melts upon temperature change; and YAG melts have one time higher average line thermal expansion coefficient compared to the Al₂O₃ melts. Al₂O₃ 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.

Key words: thermo-physical property, yttrium aluminum garnet, aerodynamic levitation technique, supercooled region

CLC Number:

TQ171

FENG Sheng, SHAN Zhi-Tao, PAN Rui-Kun, XU Bo, ZU Cheng-Kui, TAO Hai-Zheng. Thermo-physical Property of YAG Melt Measured by Aerodynamic Levitation Technique[J]. Journal of Inorganic Materials, 2018, 33(12): 1297-1302.

Figures/Tables 6

Fig. 1 Schematic diagram of aerodynamic levitator for evaluating thermophysical properties of melts(a) Top and bottom laser sources; (b) Dual color pyrometer and high speed pyrometer; (c) Water-cooled levitation stage; (d) Infrared transparent window separating the levitation gas from the bottom laser; (e) Inlet for levitation gas; (f) Aerodynamic conical converging-diverging levitator nozzle; (g) High speed camera (maximum frame rate 6250 fps; the frame rate for our measurement being set to be 2000 fps); (h) Bandpass filter with 10 nm (FWHM) centered around 532 nm; (i) Back lighting laser source with a wavelength of 532 nm; (j) Beam expanding optics; (k) Acoustic excitation device; (l) Gas mass flow controller

Fig. 2 Apparent temperature versus time curve for YAG melt As shown in the insert Tg is characterized from DSC measurement of the sample obtained by quenching

Fig. 3 Typical frame obtained from high speed camera at a certain temperature The dark hemispherical area is the shadow cast of the melt drop visible above levitation nozzle

Fig. 4 Temperature dependence of density for YAG and Al2O3 melts[12], earlier work is included[22]

Fig. 5 Temperature dependence of surface tension for YAG melt Insert shows the result of frequency sweeping at 2550 K

Fig. 6 (a) Temperature dependence of viscosity for YAG melt (Inset: lgη versus 1/T curve for YAG melt) and (b) damping curve according to the recorded radius for YAG melt at 2550 K

References 26

[1]	MCMILLAN P F, AASLAND S.Density-driven liquid-liquid phase separation in the system Al2O3-Y2O3.Nature, 1994, 369(23): 633-636.
[2]	马晓光, 李建强, 彭志坚, 等. YAG熔体无容器凝固条件下相选择机制的研究. 稀有金属材料与工程, 2015, 44(s1): 60-64.
[3]	XIANG WEI-DONG, ZHAO BIN-YU,LIANG XIAO-JUAN,et al. Packaging technologies and luminescence properties of Ce:YAG single crystal for white light-emitting diode. Journal of Inorganic Materials, 2014, 29(6): 614-620.
[4]	BU CONG-HAO, HE GANG, LI JIANG-TAO.Infrared emission property of (Ca, Cr) co-doped YAG ceramics.Journal of Inorganic Materials, 2016, 31(10): 1094-1098.
[5]	GONG M, LIANG X, WANG Y,et al. Novel synthesis and optical characterization of phosphor-converted WLED employing Ce:YAG-doped glass. Journal of Alloys & Compounds, 2016, 664: 125-132.
[6]	WEBER J K R, ABADIE J G, HIXSON A D,et al. Glass formation and polyamorphism in rare-earth oxide-aluminum oxide compositions. Journal of the American Ceramic Society, 2000, 83(8): 1868-1872.
[7]	WEBER J K R, FELTEN J J, CHO B,et al. Glass fibres of pure and erbium-or neodymium-doped yttria-alumina compositions. Nature, 1998, 393(6687): 769-771.
[8]	SPITANS S, BAAKE E, JAKOVICS A.New technology for electromagnetic levitation melting of metals.Applied Mechanics & Materials, 2014, 698(1): 237-244.
[9]	LEE J, RODRIGUEZ J E, HYERS R W,et al. Measurement of density of Fe-Co alloys using electrostatic levitation. Metallurgical & Materials Transactions B, 2015, 46(6): 2470-2475.
[10]	GRISHCHENKO D, PILUSO P.Recent progress in the gas-film levitation as a method for thermophysical properties measurements: application to ZrO2-Al2O3 system.High Temperatures-High Pressures, 2011, 40(2): 127-149.
[11]	ANDRADE M A B, BERNASSAU A L, ADAMOWSKI J C. Acoustic levitation of a large solid sphere. Applied Physics Letters, 2016, 109(4): 044101-1-4.
[12]	LANGSTAFF D, GUNN M, GREAVES G N, ,et al. Aerodynamic levitator furnace for measuring thermophysical properties of refractory liquids. Review of Scientific Instruments, 2013, 84(12): 124901-1-10.
[13]	KARGL F, YUAN C, GREAVES G N. Aerodynamic levitation: thermophysical property measurements of liquid oxides. International Journal of Microgravity Science and Application, 2015, 32(2): 320212-1-5.
[14]	OHISHI Y, KARGL F, NAKAMORI F,et al. Physical properties of core-concrete systems: Al2O3-ZrO2 molten materials measured by aerodynamic levitation. Journal of Nuclear Materials, 2017, 487: 121-127.
[15]	WUNDERLICH R K, FECHT H J, EGRY I,et al. Thermophysical properties of a Fe-Cr-Mo alloy in the solid and liquid phase. Steel Research International, 2012, 83(1): 43-54.
[16]	岳远征, 袁政, 陶海征等.一种判断玻璃形成的方法. 中国, G01N21/84, CN107228857A. 2017.10.03.
[17]	陶海征, 钟鑫, 单志涛.一种判断熔体能否形成玻璃的方法. 中国, G01N25/14, CN107389724A. 2017.11.24.
[18]	SHAN Z, LI C, TAO H.Mixed alkaline-earth effect on the mechanical and rheological properties of Ca-Mg silicate glasses.Journal of the American Ceramic Society, 2017, 100(10): 4570-4580.
[19]	QIAO A, TAO H, YUE Y.Sub-Tg enthalpy relaxation in a milling- derived chalcogenide glass. Journal of the American Ceramic Society, 2017, 100(3): 968-974.
[20]	CUMINGS D.Oscillations of magnetically levitated aspherical droplets.Journal of Fluid Mechanics, 1991, 224: 395-416.
[21]	OZAWA S, KODA T, ADACHI M, ,et al. The influence of temporal phase difference of m=±2 oscillations on surface frequency analysis for levitated droplets. Journal of Applied Physics, 2009, 106(3): 034907-1-7.
[22]	FRATELLO V J, BRANDLE C D.Physical properties of a Y3Al5O12 melt.Journal of Crystal Growth, 1993, 128(1-4): 1006-1010.
[23]	EVANS J S O, MARY T A, SLEIGHT A W. Negative thermal expansion from 0.3 to 1050 K in zirconium tungstate, ZrW2O8.Science, 1996, 272(5258): 90-92.
[24]	WEBER J K R, KRISHNAN S, ANSELL S,et al. Structure of liquid Y3Al5O12(YAG). Physical Review Letters, 2000, 84(16): 3622-3625.
[25]	KINGERY W D.Surface tension of some liquid oxides and their temperature coefficients. Journal of the American Ceramic Society, 1959, 42(1): 6-10.
[26]	SAN MIGUEL M A, SANZ J F, ALVAREZ L J,et al. Molecular- dynamics simulations of liquid aluminum oxide. Physical Review B, 1998, 58(5): 2369-2371.