Fabrication and Property of Fine-grained MgO·1.44Al2O3 Spinel Transparent Ceramic

doi:10.15541/jim20180589

Abstract

Abstract:

Grain refinement is an effective way to enhance mechanical property of MgO·nAl₂O₃ spinel transparent ceramics. In this study, the porous body was firstly compacted and pre-densified by spark plasma sintering using pure phase MgO·1.44Al₂O₃ ceramic powder as raw material. Then, further densification at final stage has been achieved through pressureless sintering. Finally, a fine-grained MgO·1.44Al₂O₃ spinel transparent ceramic was fabricated by hot isostatic pressing at 1500 ℃ for 5 h under 180 MPa of argon. Pressureless sintering results show that narrowing the pore size distribution and reducing the average pore size can promote the densification process dramatically. And the pore-closed ceramic with average grain size of 1.4 μm and relative density of 96.7% was obtained. The transparent ceramic shows average grain size of 1.9 μm, Vickers hardness of (13.94±0.20) GPa and Young's modulus of 289 GPa. In addition, the 2-mm-thick product also displayed excellent optical transparency with the maximum transmittance 70% in visible region and 80% in infrared region, respectively.

Key words: MgO·1.44Al₂O₃;, microstructure of green body, densification, fine-grained transparent ceramic, hardness

CLC Number:

TQ174

GUO Sheng-Qiang, WANG Hao, TU Bing-Tian, WANG Bin, XU Peng-Yu, WANG Wei-Min, FU Zheng-Yi. Fabrication and Property of Fine-grained MgO·1.44Al₂O₃ Spinel Transparent Ceramic[J]. Journal of Inorganic Materials, 2019, 34(10): 1067-1071.

Figures/Tables 8

Fig. 1 Typical XRD patterns of synthesized MgO·1.44Al2O3 powder (a) and sample SPS-85 (b)

Fig. 2 Particle size distribution and SEM image of synthesized MgO·1.44Al2O3 powder

Fig. 3 Relative density of samples CIP-50, SPS-73 and SPS-85 changeed with soaking time

Fig. 4 Pore size distribution of porous bodies CIP-50, SPS-73 and SPS-85

Fig. 5 SEM images of samples CIP-50, SPS-73 and SPS-85 before and after pressureless sintering (a-c): Fractured surface of samples CIP-50, SPS-73 and SPS-85; (d-e) Fractured surface of the samples CIP-50, SPS-73 pressureless sintered for 15 and 6 h; (f): Chemical etched surface of the sample SPS-85 pressureless sintered for 6 h

Fig. 6 In-line transmission spectrum and apparent photo of transparent ceramic HIP-85

Fig. 7 SEM image of etched surface of transparent ceramic HIP-85

Table 1 Grain size and mechanical properties of MgO·nAl2O3 transparent ceramics

n	Grain size/μm	Vickers hardness (9.8 N)/GPa	Young's modulus/GPa
1.5	>200	(12.75±0.12)^[12]	288.7^[10], 277^[12]
1.44	1.9	(13.94±0.20)	289
1.3^[3]	23	(12.8±0.3)	-

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Fabrication and Property of Fine-grained MgO·1.44Al₂O₃ Spinel Transparent Ceramic

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