Preparation of Y2O3 Transparent Ceramics by Colloidal Forming Method Based on the Synergistic Effect of Double Dispersants

Abstract

Abstract: The preparation of a well-dispersed, high solids content suspension is the foundation for colloidal forming methods to achieve ceramic green bodies with a uniformly microstructure, and meet the application requirements of various optical window materials. This article aims to enhance the dispersion stability of Y₂O₃ suspension by utilizing the synergistic effect of two dispersants, namely triammonium citrate (TAC) and ammonium polyacrylate (A40). The influence of the mixing ratio of two dispersants on the stability of Y₂O₃ suspension and the microstructure of formed green bodies were mainly investigated, and the advantages of the dual dispersant system in improving the solid content and stability of Y₂O₃ suspension were determined. The results show that the solid content of Y₂O₃ suspension could reach 38% (volume fraction) under the condition of TAC to A40 mass ratio of 7∶3. A uniformly microstructure and densely packed particle was achieved. Y₂O₃ transparent ceramics with a diameter of 9 mm and a thickness of 1 mm were obtained by vacuum sintering at 1 800 ℃, with a transmittance of 70.34% at 800 nm.

Key words: yttrium oxide, transparent ceramics, dispersant, colloidal molding, vacuum sintering

CLC Number:

TQ174.75

QU Shengxiao, MU Haojie, YANG Liang, LI Xiaodong, SHI Shujun, SUN Xudong. Preparation of Y₂O₃ Transparent Ceramics by Colloidal Forming Method Based on the Synergistic Effect of Double Dispersants[J]. Journal of Synthetic Crystals, 2024, 53(11): 1981-1989.

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Preparation of Y₂O₃ Transparent Ceramics by Colloidal Forming Method Based on the Synergistic Effect of Double Dispersants

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