Detail publikačního výsledku

Restraining of calcium contamination in near-net shape alumina ceramics during slip casting

DRDLÍK, D.; ROLEČEK, J.; DRDLÍKOVÁ, K.; SALAMON, D.

Original Title

Restraining of calcium contamination in near-net shape alumina ceramics during slip casting

English Title

Restraining of calcium contamination in near-net shape alumina ceramics during slip casting

Type

WoS Article

Original 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 Ca2+ 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 Ca2+ 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 Ca2+ ions. Therefore, the present modification of the mold renders the slip casting method more suitable for the near-net shaping of ceramics.

English 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 Ca2+ 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 Ca2+ 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 Ca2+ ions. Therefore, the present modification of the mold renders the slip casting method more suitable for the near-net shaping of ceramics.

Keywords

alumina; contamination; density; microstructure; slip casting

Key words in English

alumina; contamination; density; microstructure; slip casting

Authors

DRDLÍK, D.; ROLEČEK, J.; DRDLÍKOVÁ, K.; SALAMON, D.

RIV year

2019

Released

04.06.2018

ISBN

1744-7402

Periodical

International Journal of Applied Ceramic Technology

Volume

15

Number

6

State

United States of America

Pages from

1559

Pages to

1566

Pages count

8

URL

https://onlinelibrary.wiley.com/doi/10.1111/ijac.13042

Full text in the Digital Library

http://hdl.handle.net/

BibTex

@article{BUT150352,
  author="Daniel {Drdlík} and Jakub {Roleček} and Katarina {Drdlíková} and David {Salamon}",
  title="Restraining of calcium contamination in near-net shape alumina ceramics during slip casting",
  journal="International Journal of Applied Ceramic Technology",
  year="2018",
  volume="15",
  number="6",
  pages="1559--1566",
  doi="10.1111/ijac.13042",
  issn="1546-542X",
  url="https://onlinelibrary.wiley.com/doi/10.1111/ijac.13042"
}