Factors Influencing Mullite Formation in Refractory Grog

Lenka Nevřivová; David Zemánek

doi:10.4028/www.scientific.net/SSP.321.149

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HomeSolid State PhenomenaSolid State Phenomena Vol. 321Factors Influencing Mullite Formation in...

Factors Influencing Mullite Formation in Refractory Grog

Abstract:

The mineral mullite has many outstanding refractory properties. The content of aluminum oxide in the raw material is the basic factor influencing the content of mullite in the final product. Depending on Al₂O₃ content, silica-alumina materials can be divided into fireclay and high-alumina with the Al₂O₃ content of 45 % and more. The study describes the influence of raw material, the influence of homogenization of raw material and influence of firing temperature on the mullite formation in fireclay refractory material. Three kinds of refractory clay with different chemical composition were used as raw material for fireclay grog production. Three kinds of homogenization and three different temperatures were studied as factors influencing mullite formation. Powder X-ray diffraction was used to determine mullite content in material. Quantitative phase analysis was conducted by the Rietveld method. Mullite crystals morphology was observed by scanning electron microscopy.

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Periodical:

Solid State Phenomena (Volume 321)

Pages:

149-155

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.321.149

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Online since:

July 2021

Authors:

Lenka Nevřivová*, David Zemánek

Keywords:

Ceramics, Kaolinite, Mullite, Refractory Claystone, Refractory Grog

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