Preparation of YAG Transparent Ceramics by Epoxy Resin Modified Spontaneous Coagulation Casting

doi:10.15541/jim20210790

Abstract

Abstract:

YAG transparent ceramics have been widely used in the fields of laser medium and optical windows due to their excellent optical and mechanical property. The research of large-scale and complex shape YAG transparent ceramics has become a hot and difficult point of current research. As an important colloidal based forming method, spontaneous coagulation casting has shown big potentials for preparing large-scale ceramics. However, long gel curing time and low green strength are main challenges for applications. Here, water soluble epoxy glycol diglycidyl ether (EGDGE) was used to modify the spontaneous solidification forming system, and YAG transparent ceramics with different EGDGE contents were prepared by high temperature solid phase synthesis method. The influence of EGDGE addition on slurry rheology, gel strength, green porosity, ceramic microstructure, and optical property after sintering was analyzed. The results showed that the addition of EGDGE enhanced the gel curing ability of the slurry, and deformation and cracking of YAG ceramic green body were overcame. The prepared YAG green body with 0.8% (in mass) EGDGE can be sintered at 1700 ℃ for 6 h in vacuum and followed by hot isostatic press sintering at 1650 ℃ for 3 h, under 180 MPa argon pressure. The obtained YAG transparent ceramic with dimension of 90 mm×30 mm× 4.5 mm has an in-line transmittance of 80.8% at 1064 nm. This research provides a new way for the preparation of YAG transparent ceramics with large-size/complex structure.

Key words: YAG, epoxy resin, spontaneous coagulation casting, transparent ceramics

CLC Number:

TQ174

MU Licheng, YANG Jinping, WANG Junping, ZHAO Jin, LIU Mengwei, WANG Dewen, ZHANG Jian. Preparation of YAG Transparent Ceramics by Epoxy Resin Modified Spontaneous Coagulation Casting[J]. Journal of Inorganic Materials, 2022, 37(9): 941-946.

Figures/Tables 7

Fig. 1 Schematic diagram of slurry consolidation test[25]

Fig. 2 Effects of EGDGE on the rheology of slurry (a) Viscosity curve of EGDGE; (b) Viscosity curves of the slurry after adding different contents of EGDGE; (c) Storage modulus of the slurry after adding different contents of EGDGE; (d) Load-displacement curves of the slurry (solid content 80%, IB104 0.25%, IB600 0.55% (in mass)). Colorful figures are available on website

Fig. 3 Photographs of samples adding different EGDGE contents after drying (a, b) 0; (c) 0.8%; (d) 1.6%, (in mass)

Fig. 4 Influence of EGDGE on the green body property (a) Pore size distribution; (b) Porosity

Fig. 5 In-line transmittance curves of YAG ceramics adding different EGDGE Colorful figures are available on website

Fig. 6 SEM images of YAG transparent ceramics adding different contents of EGDGE (a) 0; (b) 0.4%; (c) 0.8%; (d) 1.6% (in mass)

Fig. 7 Photos of YAG transparent ceramics adding different contents of EGDGE (a) 0; (b) 0.8% (in mass)

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