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Roles of talc-illite on phase transformation, vitrification and physical properties of a triaxial porcelain body

Journal of Ceramic Processing Research
약어 : J. Ceram. Process. Res.
2019 vol.20, no.6, pp.643 - 648
DOI : 10.36410/jcpr.2019.20.6.643
발행기관 : 한양대학교 청정에너지연구소
연구분야 : 재료공학
Copyright © 한양대학교 청정에너지연구소
Suthee Wattanasiriwech 1 ,  Darunee Wattanasiriwech 2

1Mae Fah Luang University

2Mae Fah Luang University

235 회 열람

Flux forming additives have played an important role of energy reduction in the ceramic industry for centuries. Though there are available fluxing materials in the market, attempts of searching for new flux systems have still been extensively done. This paper presents the use of a combined flux system and its roles on phase transformation and physical properties of a triaxial porcelain body. Illite was used as the primary flux in the main recipe while talc, the supplementary flux, was added at 0, 3, 5 weight %. In pure form, talc dissociated into enstatite around 900 oC but when mixed in the recipe, phase changes of talc differed. Talc and illite disappeared around 1,000 oC. Around 1,200-1,300 oC, indialite and pyrophillite appeared only on the body with talc addition. Early densification could be observed when talc was present, suggesting that talc also played an important role in vitrification. The body with 3% talc showed the greatest firing shrinkage and flexural strength but lowest water absorption after firing at 1,200 oC, which was ~50 oC lower than the body without talc. Further increasing of talc content to 5% resulted in an adverse effect of these properties.

Triaxial porcelain, Illite, Talc, Phase transformation, Vitrification.

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