The preparation of cordierite from talc, fly ash, fused silica and alumina mixtures

Gören, Remzi; Özgür, Cem; Göçmez, Hasan

doi:10.1016/j.ceramint.2005.01.001

Cited by 86 publications

(53 citation statements)

References 10 publications

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“…Goren et al 21 reported that talc decomposed into amorphous magnesium metasilicate enstatite , amorphous SiO 2 , and water vapor at temperatures ranging from 900c C to 975c C. Upon further heating, the reaction among the decomposition residue of talc, polysiloxane-derived amorphous SiO 2 , and Al 2 O 3 filler seemed to initiate the formation of cordierite and the densification of struts via a reaction sintering.…”

Section: Resultsmentioning

confidence: 99%

空孔量を制御した多孔性コーディエライトセラミックスのプロセシング

Jang

Kim

2007

J. Ceram. Soc. Japan

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Porous cordierite ceramics with controlled porosity were fabricated via a reaction sintering using expandable microspheres as sacrificial templates and ceramics-filled polysiloxane as a precursor for cordierite ceramics. The influence of the sintering temperature, the template content, and the additive composition on the microstructure, porosity, and compressive strength has been investigated. The results showed that the template content, the sintering temperature, and the sintering additive composition have a significant effect on the porosity. By controlling the template content, the sintering temperature, and the sintering additive composition, it was possible to produce porous cordierite ceramics possessing a wide range of porosities ranging from 11! to 72!. The compressive strength was influenced by both the porosity and the additive composition. The compressive strength of the porous cordierite ceramics containing 6 mass! kaolin as a sintering additive was Ĭ150 MPa at 35! porosity.

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Section: Resultsmentioning

confidence: 99%

空孔量を制御した多孔性コーディエライトセラミックスのプロセシング

Jang

Kim

2007

J. Ceram. Soc. Japan

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“…Hereafter, the heat-treated samples using the unpulverized and pulverized powders were referred as the unpulverized sample and the pulverized sample, respectively. The bulk density of the pulverized sample reaches a maximum of 2.62 g/cm 3 (97% of theoretical ) at 1150°C and gradually decreases with increasing temperature. On the other hand, that of the unpulverized sample reaches a maximum of 2.27 g/cm 3 at 1200°C, which is considerably low compared with the maximum value of the pulverized sample.…”

Section: Jcs-japanmentioning

confidence: 99%

“…The bulk density of the pulverized sample reaches a maximum of 2.62 g/cm 3 (97% of theoretical ) at 1150°C and gradually decreases with increasing temperature. On the other hand, that of the unpulverized sample reaches a maximum of 2.27 g/cm 3 at 1200°C, which is considerably low compared with the maximum value of the pulverized sample. This also indicates that sintering temperature is decreased about 100°C by fine pulverizing.…”

Section: Jcs-japanmentioning

confidence: 99%

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Fabrication of high density cordierite ceramics using a coal fly ash

Ogiwara

Noda

Kimura

2010

J. Ceram. Soc. Japan

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The aim of this study is to obtain highly densified cordierite ceramics using a coal fly ash as one of the starting raw materials. In the previous studies, however, only porous cordierite ceramics were obtained since the utilized coal fly ashes were not finely pulverized. It was because fly ash was generally so hard to be finely pulverized. In addition, no detailed information for the properties of the obtained cordierite ceramics was available. We succeeded in pulverizing the fly ash by improving pulverizing procedure. Namely, its original grain size of 12 μm could be decreased to 1.2 μm. The pulverized fly ash was mixed with magnesia and alumina sources in a wet ball mill. X-ray diffraction revealed the presence of cordierite phase only for the sample heat-treated at 1150°C. The density of the sintered powder reached 97% theoretical, which was beyond the value required for HIP treatment = 95%. The sintered samples using the pulverized powder revealed sufficiently high thermo-mechanical and electrical properties compared with those of the sintered samples using the unpulverized powder. For instance, flexural strength of 132 MPa, fracture toughness of 3.0 MPa·m 1/2 , thermal expansion coefficient of 2.1 × 10 -6 /K and dielectric constant of 6.5 were obtained for the sample using the pulverized powder. HIP treatment enhanced flexural strength of the treated samples and suppressed bubble formation in them.

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“…Since natural cordierite is a rare substance, in most cases this material is produced by synthesis using either solid-state, sol-gel or glass recrystallization methods [2]. The artificial production is the result of the wide varieties of possible applications of cordierite that include, but are not limited to, substrate materials for catalytic converters and electronic circuitry boards for microelectronics, electronic packing, and insulation material for furnaces and crucible materials − all of which are mainly to replace alumina products [3]. In order for cordierite materials to be able to successfully compete with alumina not only cordierite materials must have similar or better properties, but also lower production costs; production costs are mainly influenced by the raw materials used and final synthesis temperature [4].…”

Section: Introductionmentioning

confidence: 99%

Porous Cordierite Ceramics from Natural Clays / Poraina kordierīta keramika no dabiskiem māliem

Rundāns¹,

Šperberga²

2015

Materials Science and Applied Chemistry

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-In this report the obtaining and properties of hightemperature porous ceramic materials using local carbonate clays and quartz sand resources was studied. Materials with two different porosities were obtained by using different synthesis temperatures. The test results show that these materials contain cordierite as their main crystalline phase. The porosity directly influences the compressive strength and it is greatly reduced when overall porosity increases. The CTE of obtained materials is low − about 3-10 −6 1/°C.

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The preparation of cordierite from talc, fly ash, fused silica and alumina mixtures

Cited by 86 publications

References 10 publications

空孔量を制御した多孔性コーディエライトセラミックスのプロセシング

空孔量を制御した多孔性コーディエライトセラミックスのプロセシング

Fabrication of high density cordierite ceramics using a coal fly ash

Porous Cordierite Ceramics from Natural Clays / Poraina kordierīta keramika no dabiskiem māliem

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