Preparation of ZnO·2.56Al2O3 Transparent Ceramics by Aqueous Gelcasting and Hot Isostatic Pressing

doi:10.15541/jim20180588

Abstract

Abstract:

Zinc-aluminum spinel transparent ceramics are typical multi-functional materials with excellent optical, thermal and dielectric properties. ZnAl₂O₄-Al₂O₃ ceramics green body were fabricated through aqueous gelcasting forming technique starting from the raw materials of ZnAl₂O₄and Al₂O₃. The stable slurries of ZnAl₂O₄-Al₂O₃ with 50vol% solids loading were prepared. Furthermore, the effects of the dispersant, pH value and solid loading on the rheological properties were systematically investigated. Then, gel-casted green compacts were pressureless sintered and hot isostatic pressed to obtain transparent ceramics. Finally, transparent ZnO·2.56Al₂O₃ ceramics (1.8 mm in thickness) with in-line transmittance value of 70% in visible region and higher than 80% in infrared region were obtained. The samples exhibited Vickers hardness of (11.34±0.17) GPa, Young's modulus of 285 GPa.

Key words: ZnO·2.56Al₂O₃, transparent ceramics, gel-casting, hot isostatic pressing

CLC Number:

TQ174

ZHANG Jin-Cheng, WANG Hao, XU Peng-Yu, TU Bing-Tian, WANG Wei-Min, FU Zheng-Yi. Preparation of ZnO·2.56Al₂O₃ Transparent Ceramics by Aqueous Gelcasting and Hot Isostatic Pressing[J]. Journal of Inorganic Materials, 2019, 34(10): 1072-1076.

Figures/Tables 9

Fig. 1 Zeta-potential of ZnAl2O4 and Al2O3

Fig. 2 Relation of viscosity of slurry vs contents of PAA

Fig. 3 Relation of viscosity of slurry vs pH value

Fig. 4 Relation of viscosity of slurry vs solid loading

Fig. 5 XRD patterns of the sample before and after Hot Isostatic Pressing (HIP) A: After pressureless sintering; B: After HIP

Fig. 6 Microstructure of acid-etched surface of ZnAl2O4-Al2O3 ceramic after pressureless sintering (Gray: Al2O3 phase; White: ZnAl2O4 phase)

Fig. 7 Microstructure of acid-etched surface of ZnO·2.56Al2O3 transparent ceramic after Hot Isostatic Pressing (HIP)

Fig. 8 In-line transmittance of ZnO·2.56Al2O3 transparent ceramic. The inset image shows a photograph of transparent ZnO·2.56Al2O3 ceramic

Table 1 Propertice of ZnO·2.56Al2O3 transparent ceramic

Sample	Vickers hardness/GPa	Young’s modulus/GPa	Thermal conductivity/ (20 ℃, (W·m^-1·K^-1))	Dielectric constant/ (20 ℃, 1 MHz)	Dielectric loss/ (20 ℃, 1 MHz)
ZnO·2.56Al₂O₃	11.34±0.17	285	9.8	9.17	-1.39×10^-3
ZnAl₂O₄	10.5^[5]	282^[17]	-	-	-

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Preparation of ZnO·2.56Al₂O₃ Transparent Ceramics by Aqueous Gelcasting and Hot Isostatic Pressing

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