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Restraining of calcium contamination in near‐net shape alumina ceramics during slip casting.
- Source :
- International Journal of Applied Ceramic Technology; Nov/Dec2018, Vol. 15 Issue 6, p1559-1566, 8p
- Publication Year :
- 2018
-
Abstract
- Abstract: The traditional method for shaping ceramics is by slip casting on gypsum molds; however, its application for near‐net shaping of ceramic components is limited due to contamination by calcium ions. The focus of this study is the modification of the mold to limit Ca<superscript>2+</superscript> contamination and to maintain favorable sucking properties. Cement was added to a standard gypsum mold to suppress its erosion, and a decrease in the sucking rate was observed due to its reduced macroporosity. The highest values of green densities were obtained at gypsum/cement weight ratios of 90/10 and 70/30. The microstructure analysis showed that alumina blocks prepared from the molds containing higher quantities of cement (30 or 50 wt%) were resistant to abnormal grain growth caused by Ca<superscript>2+</superscript> contamination from the gypsum. The gypsum/cement mixtures for making molds for slip casting significantly limit mold erosion due to a lower sucking rate and abnormal grain growth of the slip cast samples because of the decreased diffusivity of Ca<superscript>2+</superscript> ions. Therefore, the present modification of the mold renders the slip casting method more suitable for the near‐net shaping of ceramics. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1546542X
- Volume :
- 15
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- International Journal of Applied Ceramic Technology
- Publication Type :
- Academic Journal
- Accession number :
- 132162126
- Full Text :
- https://doi.org/10.1111/ijac.13042