The effect of firing shrinkage ratio of ceramics on thickness

Hsu, Chun-Ting; Chou, Chien-Chih; Huang, Tai Shen; Hung, Peng Mao; Chen, Chien Nan

doi:10.1080/09720502.2017.1358892

Cited by 2 publications

(1 citation statement)

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“…The ash fusion system in the pseudo-ternary system Al 2 O 3 -SiO 2 -Base (FeO + CaO + K 2 O) [39] allowed to determine about 5 mass% solid solution limit of Fe 2 O 3 in mullite structure sintered at 1300 • C [24]. Considering the presence of Fe 2 O 3 in FA and kaolins (Table 1) as well as hematite (Table 3), substitution of Fe 3+ for Al 3+ in the mullite structure can be assumed.…”

Section: Effect Of Fe 2 O 3 On Mullite Structurementioning

confidence: 99%

Effects of Kaolin Additives in Fly Ash on Sintering and Properties of Mullite Ceramics

2021

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The effective utilization of fly ash (FA) as a raw material for ceramics production is performed on the FA-kaolin mixtures containing kaolins 10% by mass. The mixtures in comparison with FA and three raw kaolins were annealed to mullite ceramics at temperatures of 1000, 1100, 1200 and 1300 °C. The main aims were to contribute to the discussion on the effect of impurity of Na,K-feldspars in kaolins and Fe2O3 in FA on sintering procedure, porous ceramics properties and mullite structural properties. The phases were characterized using X-ray diffraction and thermogravimetry DTA/TGA methods. Mercury intrusion porosimetry was used for characterization of porosity of ceramic samples. Results evidenced the influence of feldspars in kaolins and Fe2O3 in FA on the sintering temperatures and properties of mullite ceramics. The fully FA-based ceramic sintered at 1100 °C exhibited post-sintering properties of bulk density 2.1 g/cm3; compressive strength 77.5 MPa; and porosity, 2% in comparison with the FA/kaolin-based ceramics properties of bulk density 2.2 g/cm3; compressive strength, 60–65 MPa; and porosity from 9.3 to 16.4% influenced by Na,K-feldspars. The best structural and mechanical characteristics were found for the FAK3 sample, supported by the high content of kaolinite and orthoclase in the kaolin K3 additive. The FAK3 annealed at 1100 °C exhibited good compressive strength of 87.6 MPa at a porosity of 10.6% and density of 2.24 g/cm3 and annealed at 1300 °C the compressive strength of 41.3 MPa at a porosity of 19.2% and density of 1.93 g/cm3.

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Section: Effect Of Fe 2 O 3 On Mullite Structurementioning

confidence: 99%