Mechanical properties of high purity mullite at elevated temperatures

Ohira, Hiroyuki; Ismail, M. G. M. U.; Yamamoto, Yutaka; Akiba, T.; Sōrniya, Shigeyuki

doi:10.1016/0955-2219(95)00155-7

Cited by 37 publications

(23 citation statements)

References 10 publications

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“…Even the strength values reported by Viswabaskaran et al [15] for mixtures of calcined clays with aluminium hydroxides are as low as 29-38 MPa, for sintered products produced from raw mixtures containing boehmite, or 90-99 MPa, for those containing gibbsite, in spite of fully conversion of the samples to mullite. Yet, the strength values calculated in this study are much lower than those obtained by Ohira et al [36] (300-400 MPa) and Osedin and Baudín [37] (180-220 MPa) for mullite ceramics produced by sintering of high purity mullite powders.…”

Section: Sintered Products Characterizationcontrasting

confidence: 81%

Mullitization kinetics from silica- and alumina-rich wastes

Vieira

Ramos

Vieira

2007

Ceramics International

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Mullite was produced from a mixture of raw wastes with high contents of silica and aluminium hydroxides. The first were wastes from slate rocks and had muscovite, chlorite and quartz as their main crystalline phases. The second were aluminium sludges resulting from the physicochemical treatment of the wastewaters generated by aluminium surface treatment industries. As-received raw materials were weighed to produce the 2:1 alumina:silica stoichiometric mixture, corresponding to an excess of alumina relatively to the ideal 3:2 mullite composition. The nonisothermal activation energies for primary (431 kJ/mol) and secondary mullite crystallization (454 kJ/mol) were determined by differential dilatometry. Sintered products were composites of mullite and a-alumina dispersed in a glassy phase and presented flexural strengths higher than 100 MPa after sintering temperatures at 1285 8C. #

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Section: Sintered Products Characterizationcontrasting

confidence: 81%

Mullitization kinetics from silica- and alumina-rich wastes

Vieira

Ramos

Vieira

2007

Ceramics International

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“…The influence of the amorphous phase, γ-Al 2 O 3 and mullite on the TRS and E of ceramic bodies has been also attested by several authors (e.g. Dokko et al, 1977;Auerkari, 1996;Ohira et al, 1996;Osendi and Baudìn, 1996;Carty and Senapati, 1998;Stathis et al, 2004). SE-SEM images show a diffuse vitrification in samples fired at 1000°C (Fig.…”

Section: The Effect Of Firing Temperaturesupporting

confidence: 66%

Strength of kaolinite-based ceramics: Comparison between limestone- and quartz-tempered bodies

Allegretta

Eramo

Pinto

et al. 2015

Applied Clay Science

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“…In addition, a good match of the coefficients of thermal expansion (CTE) of silicon (4 × 10 -6 K -1 ) and mullite (5 × 10 -6 K -1 ) substrate material is a prerequisite since the deposition of silicon is done at elevated temperatures in a CVD process. [7] The CTE of mullite matches much better that of Si compared to that of alumina (8.4 × 10 -6 K -1 ). Since the natural abundance of mullite of high purity is too low for industrial use, mullites are synthesized either by chemical routes or by reaction sintering of natural alumino-silicates.…”

mentioning

confidence: 90%