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

doi:10.1111/ijac.13218

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

Department of Resources Engineering

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	1493-1500
Number of pages	8
Journal	International Journal of Applied Ceramic Technology
Volume	16
Issue number	4
DOIs	https://doi.org/10.1111/ijac.13218
Publication status	Published - 2019 Jul 1

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Condensed Matter Physics
Marketing
Materials Chemistry

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title = "Fully sintered alumina with a higher Vickers hardness prepared using a gel-casting process",

abstract = "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.",

author = "Lee, {Kuo Yang} and Chen, {Chih Cheng} and Hsiang, {Hsing I.} and Yen, {Fu Su} and Huang, {Chi Yuen}",

note = "Funding Information: This work was financially sponsored by the Ministry of Science and Technology, Taiwan (104‐2622‐E‐006 ‐014 ‐ CC2 and 107‐2221‐E‐006 ‐023). Publisher Copyright: {\textcopyright} 2019 The American Ceramic Society",

year = "2019",

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doi = "10.1111/ijac.13218",

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AU - Lee, Kuo Yang

AU - Chen, Chih Cheng

AU - Hsiang, Hsing I.

AU - Yen, Fu Su

AU - Huang, Chi Yuen

N1 - Funding Information: This work was financially sponsored by the Ministry of Science and Technology, Taiwan (104‐2622‐E‐006 ‐014 ‐ CC2 and 107‐2221‐E‐006 ‐023). Publisher Copyright: © 2019 The American Ceramic Society

PY - 2019/7/1

Y1 - 2019/7/1

N2 - 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.

AB - 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.

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

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