Preparation and Properties of Infrared Transparent (Sc x Y1-x )2O3-MgO Composite Ceramics

doi:10.12068/j.issn.1005-3026.2025.20240183

Abstract

Abstract:

Sc₂O₃-MgO composite ceramics is a highly promising new type of infrared ceramic material， but its application is limited due to its low infrared transmittance. Sc₂O₃-MgO composite ceramics， incorporating varying atomic fractions of Y₂O₃， were fabricated via the sol-gel method and hot-press sintering. The phase composition， microstructure， and infrared transmittance of these ceramics were subsequently characterized and investigated， revealing that Y₂O₃ promoted the densification of （Sc _x Y_1-_x ）₂O₃-MgO ceramics by comparing the relative densities of the pressureless sintered samples. A series of （Sc _x Y_1-_x ）₂O₃-MgO ceramics with a ralative density higher than 99% were obtained using hot-press sintering technology. XRD results indicate that the perovskite-type ScYO₃ phase with optical anisotropy is generated in the （Sc _x Y_1-_x ）₂O₃-MgO composite ceramics when the ratio of Y₂O₃ to Sc₂O₃ is close （x=0.4~0.6）. The average grain size of the Sc₂O₃-MgO composite ceramics decreased from 498 nm to 260 nm by replacing part of Sc₂O₃ with 20% Y₂O₃ atomic fraction to form a （Sc_0.8Y_0.2）₂O₃ solid solution with a low melting point. On this basis， Zr⁴⁺ with a 3% atomic fraction was added as a sintering aid to prepare a Zr⁴⁺：（Sc_0.8Y_0.2）₂O₃-MgO composite ceramics， fine grains of 190 nm， and a maximum infrared transmittance of 85%. Grain refinement of composite ceramics is the main factor in improving optical transmittance while ensuring high density.

Key words: Sc₂O₃-MgO, composite ceramics, infrared transparent, microstructure, component regulation

CLC Number:

TQ 174.75

Xiao-dong LI, Hao-jie MU, Ben-chao LIN, Yang LU. Preparation and Properties of Infrared Transparent (Sc _x Y_1-_x )₂O₃-MgO Composite Ceramics[J]. Journal of Northeastern University(Natural Science), 2025, 46(8): 149-155.

Figures/Tables 9

Fig.1 Relative density of (Sc x Y1-x )2O3-MgO composite ceramics with different Y2O3 atomic fractions pressureless sintering at 1 500 °C for 4 h

Fig.2 XRD spectra of (Sc x Y1-x )2O3-MgO composite ceramics with different Y2O3 atomic fractions after hot-press sintering

Fig.3 Microstructure of (Sc x Y1-x )2O3-MgO composite ceramics with different Y2O3 atomic fractions after hot-press sintering

Fig.4 Average grain size of (Sc x Y1-x )2O3-MgO composite ceramics with different Y2O3 atomic fractions after hot-press sintering

Fig.5 Relative density of (Sc x Y1-x )2O3-MgO composite ceramics with different Y2O3 atomic fractions after hot-press sintering

Fig.6 XRD spectra of Zr4+:(Sc x Y1-x )2O3-MgO composite ceramics with 3% Zr4+ atomic fractions under different holding time after sintering

Fig.7 Microstructure of Zr4+:(Sc x Y1-x )2O3-MgO composite ceramics with 3% Zr4+ atomic fractions under different holding time after sintering

Fig.8 Relative density and grain size of Zr4+:(Sc0.8Y0.2)2O3-MgO composite ceramics with 3% Zr4+ atomic fractionsunder different holding time after sintering

Fig.9 Infrared transmittance of composite ceramics with different components

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Preparation and Properties of Infrared Transparent (Sc _x Y_1-_x )₂O₃-MgO Composite Ceramics

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