Large-sized La2O3-TiO2-SiO2 Amorphous Oxide Fabricated by Hot Press Sintering

doi:10.15541/jim20160619

Abstract

Abstract:

La₂O₃-TiO₂ amorphous oxide has prospective applications because of its remarkable optical properties. However, due to its poor glass-forming abilities, it is difficult to prepare this material in a traditional way. The containerless solidification method can overcome this shortcoming, but the formed material size is generally restricted to be less than 10 mm. In order to obtain large-sized La₂O₃-TiO₂ amorphous oxide, a small amount of SiO₂ was added to the La₂O₃-TiO₂ oxide system to form the amorphous oxide powders by aerodynamic levitation furnace. Subsequently, the high-density La₂O₃-TiO₂-SiO₂ materials were fabricated by vacuum hot press sintering. Compositions and microstructure properties were systematically studied by XRD and SEM. The results showed that SiO₂ could improve the glass-forming ability of La₂O₃-TiO₂. The raw powders made by aerodynamic levitation furnace were completely non-crystal, while the sintered samples had weak crystallization, which affected fully densification of sintered samples. There was a small amount of porosity in the high-density product made by vacuum hot press sintering. In addition, sintering densification mechanism of the La₂O₃-TiO₂-SiO₂ amorphous powders was analyzed. Finally, the optical property of hot pressed La₂O₃-TiO₂-SiO₂ material was investigated. It is found that La₂O₃-TiO₂-SiO₂ material still kepts high refractive index of above 2.2 in the visible light region. Small amount addition of SiO₂ species improves the glass-forming abilities, yet decreases the refractive index slightly.

Key words: amorphous oxide, aerodynamic levitation, hot-press sintering, large-size, densification

CLC Number:

TQ171

LI Ren-Yi, LI Xiao-Yu, LI Jian-Qiang, ZHAO Jian-Ling, MA Xiao-Guang, HE Gang, LI Jiang-Tao. Large-sized La₂O₃-TiO₂-SiO₂ Amorphous Oxide Fabricated by Hot Press Sintering[J]. Journal of Inorganic Materials, 2017, 32(8): 851-856.

Figures/Tables 9

Fig. 1 DSC curve of La2O3-TiO2-SiO2 glass ball

Fig. 2 SEM image of amorphous powders

Fig. 3 XRD patterns of samples sintered at different temperatures

Fig. 4 Fracture SEM images of samples sintered at different temperatures(a, b) 860℃; (c, d) 870℃

Fig. 5 Shrinkage curves of LTS amorphous powders sintered at different pressuresThe inset shows the dependence of shrinkage time on applied pressure

Fig. 6 Relationships between sintering temperature Ts , relative density θ and ln[1/(1-θ)] and the sintering time t

Fig. 7 ln[1/(1-θ)]~t curve of initial sintering stage

Fig. 8 ln[1/(1-θ)]~t curve of intermediate sintering stage

Fig. 9 Refractive index curves of 30.8LaO3/2-69.2TiO2 glass ball and sample sintered at 60 MPa and 860℃

References 21

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Large-sized La₂O₃-TiO₂-SiO₂ Amorphous Oxide Fabricated by Hot Press Sintering

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