Fabrication and Properties of Mg0.75Al2.16O4 Transparent Ceramics by SPS Combined with Hot Isostatic Pressing

doi:10.16552/j.cnki.issn1001-1625.2026.0137

Abstract

Abstract:

Aluminum-rich spinel transparent ceramics exhibit excellent mechanical and optical properties and have significant application potential in optoelectronic windows and transparent armor. In this study， transparent ceramics were prepared from single-phase Mg_0.75Al_2.16O₄ powders by spark plasma sintering combined with hot isostatic pressing （HIP） treatment. The phase composition and microstructural evolution of the ceramics during pressure-assisted sintering were systematically investigated. The results show that a significant amount of α-Al₂O₃ secondary phase precipitates in samples at 1 300 ℃. With increasing SPS pre-sintering temperature， the content of the α-Al₂O₃ phase gradually decreases and completely disappears at 1 500 ℃. Pre-sintered ceramics with fine grains and low porosity are obtained at 1 400 ℃. After HIP treatment， the transparent ceramics exhibit an average grain size of approximately 2.88 μm， and the in-line transmittance in the visible and infrared regions reaches 72% （500 nm） and 84% （2 500 nm）， respectively. Benefiting from the formation of a fine-grained microstructure， the Vickers hardness of the samples reaches 14.3 GPa， which is about 10% higher than that of conventional MgAl₂O₄ transparent ceramics. This study provides insight into the fabrication and performance modulation of aluminum-rich spinel transparent ceramics with refined microstructures.

Key words: Mg_0.75Al_2.16O₄, transparent ceramics, spark plasma sintering, Al₂O₃ phase, mechanical property

CLC Number:

TQ174

WU Wentao, TU Guangsheng, LIAO Jiaxing, ZHANG Chaojie, TU Bingtian, WANG Hao. Fabrication and Properties of Mg_0.75Al_2.16O₄ Transparent Ceramics by SPS Combined with Hot Isostatic Pressing[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(8): 2899-2908.

Figures/Tables 10

Fig.1 XRD pattern， SEM image， and particle size distribution of Mg0.75Al2.16O4 powder

Fig.2 XRD patterns of Mg0.75Al2.16O4 ceramics prepared by SPS after Le Bail full-pattern fitting

Fig.3 SEM images of surface etching and chemical composition analysis of Mg0.75Al2.16O4 pre-sintered ceramics prepared at different SPS temperatures

Fig.4 XRD patterns of Mg0.75Al2.16O4 transparent ceramics after HIP treatment

Fig.5 SEM images of etched surfaces of SPS1300-HIP to SPS1500-HIP transparent ceramics， and EDS elemental mapping images of SPS1300-HIP transparent ceramics

Fig.6 Grain size distribution of Mg0.75Al2.16O4 transparent ceramics after HIP treatment

Fig.7 Refractive index and in-line transmittance of Mg0.75Al2.16O4 transparent ceramics after HIP treatment at 1 650 ℃

Fig.8 Vickers hardness and elastic modulus of Mg0.75Al2.16O4 transparent ceramics

Fig.9 Vickers hardness of SPS1350-HIP under different loads

Fig.10 True hardness calculated based on Nix-Gao model

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Fabrication and Properties of Mg_0.75Al_2.16O₄ Transparent Ceramics by SPS Combined with Hot Isostatic Pressing

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