Fully sintered alumina with a higher Vickers hardness prepared using a gel-casting process

Kuo Yang Lee, Chih Cheng Chen, Hsing I. Hsiang, Fu Su Yen, Chi Yuen Huang

研究成果: Article

摘要

The dispersant (commercial ammonium polyacrylate), sintering additive (Mg2+), and chelating agent (EDTA) effects on the Zeta potential and rheological behavior of alumina slurry with high solid content were investigated. The alumina ceramic green microstructures and sintered microstructures prepared using slurries with different additives using the gel-casting process were also studied. It was observed that the dispersion deteriorated after adding Mg2+. Slurry simultaneously added with dispersant and EDTA-chelated Mg2+ produced higher absolute Zeta potential value and low viscosity due to EDTA chelating with Mg2+. The sample added with dispersant and EDTA-chelated Mg2+ exhibited a uniform green microstructure, high relative sintered density (99.5% theoretical density), and a nearly pore-free microstructure with an average grain size of about 1.5 μm. For the first time to our knowledge, the maximum Vickers hardness (22 GPa) was obtained for alumina simultaneously added with Mg2+ and EDTA, pressureless sintered at 1500°C in air.

原文English
頁(從 - 到)1493-1500
頁數8
期刊International Journal of Applied Ceramic Technology
16
發行號4
DOIs
出版狀態Published - 2019 七月 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Condensed Matter Physics
  • Marketing
  • Materials Chemistry

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