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Effect of aluminium sulphate on phase formation and morphology development of mullite whiskers

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Abstract:

Well developed mullite whiskers were obtained by heating compacts of kaolin and 2 wt.% sodium pyrophosphate powder at 1350°C for 10 h, with or without a small addition of aluminium sulphate. Without aluminium sulphate, mullite whiskers were obtained with an aspect ratio of >8 and reasonably uniform diameter (∼0.05–0.3 μm). When aluminium sulphate additions were employed a mass of relatively well developed and interlocked whisker-shaped crystals were produced, with an aspect ratio of >10 (∼0.05–0.3 μm in diameter). Larger whiskers were also observed, with aspect ratio of >25 (∼0.2–0.5 μm in diameter).

Keywords: ALUMINIUM SULPHATE; KAOLIN; MORPHOLOGY DEVELOPMENT; MULLITE; WHISKERS

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/claymin.2010.045.3.349

Publication date: September 1, 2010

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