Preparation of MgO·1.5Al2O3 Transparent Ceramic by Pressureless Sintering and Hot Isostatic Pressing

doi:10.15541/jim20150010

Abstract

Abstract:

Possessing unique optical and mechanical properties, magnesium aluminate spinel transparent ceramic has been regarded as an important multifunctional material. In this study, pure phase MgO·1.5Al₂O₃ ceramic powders with uniform and fine particle size were synthesized through solid-state reaction. A two-step structural refinement procedure, including XRD Rietveld analysis by Fullprof software and further refinement by spinel solid solutions structure modeling program SIDR, was utilized to resolve the crystal structure of synthesized powders. After refinement, the crystal structure was finally determined to be (Mg_0.46Al_0.54)^IV[Mg_0.26Al_1.64□_0.09]^VIO₄. Using the synthesized MgO·1.5Al₂O₃ ceramic powders, high performance transparent ceramic was fabricated by pressureless vacuum sintering and subsequent hot isostatic pressing sintering (HIP). The relative density of the sample HIP-sintered at 1850 ℃ for 4 h under 180 MPa Ar could reach 99.75%. In the meantime, the in-line transmittance measurement of the 2-mm-thick sample displayed good optical transparency from ultraviolet to middle-infrared wavelengths with the maximum transmittance 65% in visible region and 80% in infrared region. The MgO·1.5Al₂O₃ transparent ceramic also exhibited good mechanical properties of Vickers hardness ((12.75 ± 0.12) GPa) and Young's modulus (277 GPa).

Key words: MgO·1.5Al2O3, transparent ceramic, structure refinement, hot isostatic pressing

CLC Number:

TQ174

YUAN Ze, WANG Hao, TU Bing-Tian, LIU Xin, XU Chun-Lai, WANG Wei-Ming, FU Zheng-Yi. Preparation of MgO·1.5Al₂O₃ Transparent Ceramic by Pressureless Sintering and Hot Isostatic Pressing[J]. Journal of Inorganic Materials, 2015, 30(8): 843-847.

Figures/Tables 6

Fig. 1 XRD patterns of synthesized MgO·1.5Al2O3 powder (a) and as-sintered sample (b)

Table 1 Crystal structure refinement of MgO·1.5Al2O3 powders

First step: refined by Fullprof software
Crystal	Al^IV		□^IV		Al^VI		□^VI		a/nm		u		R_p		R_wp		χ²
MgO·1.5Al₂O₃	0.9721		0.0289		1.9185		0.08144		0.8030749		0.25991		5.30		6.90		1.39
Second step: refined by SIDR program
Crystal		Al^IV		Mg^IV		□^IV		Al^VI		Mg^VI		□^VI		a/nm		u		F(Xi)
MgO·1.5Al₂O₃		0.5397		0.4602		0		1.6397		0.2588		0.0906		0.803086		0.25939		2.2

Fig. 2 SEM image of synthesized MgO·1.5Al2O3 powder

Fig. 3 SEM images of MgO·1.5Al2O3 ceramics (a) fractured surface after pressureless sintering at 1650 ℃ and (b) etched surface after HIP sintering at 1850 ℃

Fig. 4 (a) Appearance and (b) in-line transmission spectrum of MgO·1.5Al2O3 transparent ceramic (thickness = 2 mm)

Table 2 Comparison of mechanical, thermal, and dielectric properties between MgO·1.5Al2O3 and MgAl2O4 transparent ceramics

Sample	Vickers hardness (9.8 N) /GPa	Young's modulus /GPa	Specific heat capacity (20 ℃) /(J·g^-1·K^-1)	Thermal conductivity (20 ℃)/(W·m^-1·K^-1)	Dielectric constant (20℃, 1 MHz)
MgO·1.5Al₂O₃	12.75±0.12	277	0.83	16.3	9.70
MgAl₂O₄	12	267	~0.82	~25.0	8.33

References 19

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Preparation of MgO·1.5Al₂O₃ Transparent Ceramic by Pressureless Sintering and Hot Isostatic Pressing

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