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Powder Modification Technology and Preparation of MgAl₂O₄ Transparent Ceramics by Hot Pressing

L. Guo, Y. Zhao, S. Xu, H. Shi, A. Zheng, Y. Ma

Journal of Ceramic Science and Technology, Vol. 13, No. 2 (2022), pp. 113-120

DOI: 10.4416/JCST2022-00007

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Abstract

Hot-pressed MgAl2O4 transparent ceramics were successfully prepared based on powder modification technology using commercial MgAl2O4 powder. With a 2-wt% polyvinyl alcohol (PVA) addition and the powder modification treatment, the average particle size of the powder is 70 – 150 nm, the specific surface area is 32.16 m2/g, and the median diameter (D (50)) is 7.2730 μm. Concluding the research about the effect of LiF on the properties of hot-pressed MgAl2O4 ceramics prepared based on powder modification technology, hot-press sintering proceeded well with a doping of 2 wt% PVA and 1 wt% LiF, and the mean maximum transmittance within the wave length range of 400 – 800 nm and 3 – 5 μm is 73.48 % and 83.09 % respectively, and the average grain size is 20 – 40 μm. XRD (X-ray diffraction) and ICP (Inductively Coupled Plasma) analysis of hot-pressed MgAl2O4 transparent ceramics indicate that the Li elements in hot-pressed transparent ceramics did not escape completely, but may exist as LiAlO2.

Keywords

Powder modification technology, powder characterization, MgAl2O4 transparent ceramics, optical properties, hot pressing

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