Effects of glycerol addition on the slurry dispersion and mechanical properties of alumina ceramics prepared by gel-casting process
| Autor: | Kuo Yang Lee, Dingyuan Tang, Chi Yuen Huang, Chih Cheng Chen, Jun Wang, Hsing I. Hsiang, Fu Su Yen |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Aqueous solution Process Chemistry and Technology technology industry and agriculture Green body 02 engineering and technology equipment and supplies 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Grain size Surfaces Coatings and Films Electronic Optical and Magnetic Materials Magnesium nitrate chemistry.chemical_compound Chemical engineering chemistry 0103 physical sciences Vickers hardness test Materials Chemistry Ceramics and Composites Zeta potential Relative density 0210 nano-technology |
| Zdroj: | Ceramics International. 47:20260-20267 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2021.04.033 |
| Popis: | The addition of glycerin reduced the dielectric constant of the aqueous alumina suspension, increased the zeta potential of the alumina powder, thickened the electric double layer, and improved the dispersibility of an alumina suspension for aqueous gel-casting. The glycerin-added suspension can effectively avoid the agglomeration, so that the green body had a more uniform microstructure and a higher relative density. The simultaneous addition of magnesium nitrate, EDTA and glycerol in aqueous-based alumina slurry can effectively promote the homogeneity of green microstructure and hence obtaining the sintered sample with relative sintered density of 99.7% and the mean grain size and distribution of 1.20 ± 0.44 μm. The (pressure-less sintered) sample Mg + EDTA + Gly exhibited superior Vickers hardness comparable to the samples prepared using HP, HIP, and SPS due to the small grain size (1.2 μm) and high sintered density (99.7%). |
| Databáze: | OpenAIRE |
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