Structural studies of Cr-doped mullite derived from single-phase precursors

Tkalčeć, Emilija; Gržeta, Biserka; Popović, Jasminka; Ivanković, Hrvoje; Rakvin, Boris

doi:10.1016/j.jpcs.2005.12.002

Cited by 8 publications

(2 citation statements)

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“…In addition, sapphirine and spinel may react with residual quartz to form cordierite according to the decreasing peak intensity of sapphirine and spinel with the increasing cordierite phase, as illustrated in eq.3 and 4. [12,13] 5. In this study, cordierite has already formed in the powder that milled at 300 rpm for 30 min and appeared as the main phase when grinding time increased to 90 min, verifying the influence of mechanical activation process on the kinetics of reaction to form cordierite.…”

Section: Rotational Speed [Rpm]mentioning

confidence: 99%

Influence of Mechanical Activation on the Phase Formation in the Synthesis of Cordierite from Talc and Andalusite

Vairojanakit

Sinchai

2019

KEM

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Cordierite is known as a leading candidate material for many applications. In this study, mechanical activation assisted synthesis of cordierite using andalusite as a starting material was attempted and phase formation of powder obtained from the heat treatment of talc-andalusite-silica system was investigated. The stoichiometric composition of cordierite (2MgO·2Al2O3·5SiO2) was prepared and ground in planetary ball mill at the rotational speed of 300 and 500 rpm for 0, 30, 60 and 90 min. The powder mixtures were heat treated in air at the temperature ranging from 1150 to 1350°C for 2 hours. Thermal reaction, phase present and microstructure of the starting materials and synthesized products were analyzed by differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. It was found that cordierite phase increased with the grinding time and speed and synthesis temperature. The kinetics of phase formation in this system were also discussed.

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Section: Rotational Speed [Rpm]mentioning

confidence: 99%

Influence of Mechanical Activation on the Phase Formation in the Synthesis of Cordierite from Talc and Andalusite

Vairojanakit

Sinchai

2019

KEM

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“…It has been shown that a wide variety of transition metal s can enter into mullite structure. The solubility limit of the transition metals ions in mullite depends on their radii and the oxidation state [15]. Doping of mullite with chromium is of special interest because the low thermal expansion of mullite can be further reduced by chromium incorporation [4,16].…”

Section: Géis Bifásicos Dementioning

confidence: 99%

Role of Cr2O3 on the mullittization of di-phasic Al2O3-SiO2 gel

Roy¹,

Bandyopadhyay

Das

et al. 2010

Cerâmica

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Diphasic Al2O3-SiO2 gel was synthesized by sol-gel route from inorganic salts following aqueous phase colloidal interaction and the effect of Cr2O3 additive on the formation of mullite ceramics from this diphasic gel was investigated. The gel powder was thoroughly characterized by chemical analysis, measurement of surface area, bulk density and FTIR spectroscopy. The calcined gel was compacted with Cr2O3 additives in three different proportions (ca. 1, 2 and 3 wt%) and heat treated at different elevated temperatures (ca, 1400, 1500 and 1600 ºC). The analyses of microstructure and phase composition of the sintered masses were carried out by scanning electron microscopy and XRD technique. The morphology of the mullite crystals changed significantly in the presence of the additives. It has been observed that more than 7% more mullite has been formed with the addition of maximum 3% additive only. Using the additive, the maximum reduction in apparent porosity was about 30% and maximum improvement in density in the sintered compacts was about 14%. The flexural strength and fracture toughness of the sintered compacts also improved by 16% and 6% respectively in the presence of the Cr2O3 additive under the experimental condition.

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2015

Nano-Glass Ceramics

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Structural studies of Cr-doped mullite derived from single-phase precursors

Cited by 8 publications

References 20 publications

Influence of Mechanical Activation on the Phase Formation in the Synthesis of Cordierite from Talc and Andalusite

Influence of Mechanical Activation on the Phase Formation in the Synthesis of Cordierite from Talc and Andalusite

Role of Cr2O3 on the mullittization of di-phasic Al2O3-SiO2 gel

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