Synthesis of mullite powder and its characteristics

Ismail, M. G. M. U.; Nakai, Zenjiro; Minegishi, Keeichi; Sōmiya, Shigeyuki

doi:10.1016/0267-3762(86)90014-7

Cited by 41 publications

(10 citation statements)

References 11 publications

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“…According to recent studies [2,3], mullite ceramics show little degradation in flexure strength (above 350 MPa) up to 1300 ~ because of their highly covalent character. Sintered mullite is also attractive for its potential application in infrared windows [4] or low-expansion substrate manufacturing [5,6].…”

Section: Introductionmentioning

confidence: 98%

Characteristics of mullite prepared from co-precipitated 3Al2O3·2SiO2 powders

Lee¹,

Yu²

1992

J Mater Sci

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Diphasic gels were prepared by a precipitated process from the mixed solutions of colloidal silica and aluminium nitrate. High-purity stoichiometric mullite powders were produced by calcination of the products of these gels, with an exothermic reaction occurring at 1300~ The chemical and structural evolutions, as a function of thermal treatment, have been characterized by differential thermal analysis, thermogravimetric analysis, X-ray diffraction, infrared spectroscopy, and electron microscopy. The components of the co-precipitated gels react independently with increasing temperature up to the formation of mullite. The composition of mullite also varies with the temperature of thermal treatment. The calcined powders treated by ball-milling could be sintered into a high-density body, in spite of the occurrence of a small amount of glassy phase during sintering.

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Section: Introductionmentioning

confidence: 98%

Characteristics of mullite prepared from co-precipitated 3Al2O3·2SiO2 powders

Lee¹,

Yu²

1992

J Mater Sci

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“…The derivative of the differential thermal analysis curve (DDTA) as shown here also complements both the two consecutive exotherms. In comparison to earlier DTA curves shown [1,2,7], the exhibition of the above pronounced broad exotherm before the occurrence of most accepted mullite exotherm at 1320~ is significantly new one. Moreover, the present DTA trace is more smooth in comparison to large base line drifts shown earlier by Hsi et al [7] and Hyatt et al [4].…”

Section: ) Retardation Of the Crystallization Of Alumina Polymorphs mentioning

confidence: 80%

“…Hoffman et al [1] first synthesized it by three different sets of component materials. DTA analysis of first set of it made by use of boehmite sol and TEOS showed an endotherm at 400~ and explained as due to decomposition of boehmite phase and then showed a broad exotherm associated with mullite formation occurred over the entire region from 700-1230~ Ismail et al [2] prepared second set of diphasic mullite gel by using 7-A1203 sol and colloidal silica sol and noted endotherms at 96 and 420~ represented with loss of moisture form the gel and dehydration of boehmite to form ?-A1203 and finally showed an exotherm at 1296~ due to crystallization of mullite. Subsequently, Li and Thomson [3] made diphasic gel as per first set of mixture and conformed the exhibition of endotherm at 500~ and exotherm at 1320~ Hyatt et al [4] prepared diphasic gel bz dispersing boehmite (AIOOH) powder and colloidal silica (Ludox As-40, DuPont), noted a small and broad exotherm over a wide temperature range at 1360~ besides two usual large endotherms.…”

Section: Introductionmentioning

confidence: 97%

New data on the thermal analysis of diphasic mullite gel

Chakravortty

1996

Journal of Thermal Analysis

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A diphasie mullite gel has been synthesized by using Ludox and AI(NO3)y9H~O in ammoniaeal solution. Both DTA and DDTA studies have been performed with a sensitive differential thermal analyzer system. Besides usual cxotherm due to mullite formation, a pronounced exotherm between 800-1300~ has been noted. Considering previous XRD data, it is explained as due to formation of Si-Al spinel phase, which is subsequently transformed cxothermally at ~1320~ to mullite.

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“…Muitos outros métodos de obtenção de precursores de mulita podem ser encontrados [4,21,[24][25][26][27][28]. O método mais utilizado é a obtenção de sinter de mulita via caulinita por ser um processo barato e onde as variáveis são mais facilmente controladas.…”

Section: Outros Métodosunclassified

Mulitização em refratários utilizando diferentes fontes precursoras: revisão

Magliano

Pandolfelli

2010

Cerâmica

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A mulitização ocorre pelo mecanismo de nucleação e crescimento. Com o aumento da temperatura, inicia-se a Grupo de Engenharia de Microestrutura de Materiais -GEMM, Departamento de Engenharia de MateriaisUniversidade Federal de S. Carlos, Rod. Washington Luiz, km 235, C.P. 676, S. Carlos, SP 13565-905 vicpando@power.ufscar.br, Vinicius@plugnet.com.br Resumo A mulita é uma fase cerâmica obtida pela reação entre alumina e sílica em temperaturas elevadas e amplamente utilizada em refratários devido as suas excelentes propriedades. Muitos trabalhos na literatura estudaram e analisaram a síntese de mulita, bem como sua incorporação em refratários, que pode ser feita pela adição do pó pré-formado ou pela obtenção in-situ. Esta revisão une os principais trabalhos publicados sobre síntese de mulita focando principalmente aspectos da cinética da reação, como a ocorrência de fase líquida metaestável durante a mulitização, etapa inevitável para o processo. O trabalho traz também um panorama geral das diversas fontes silico-aluminosas precursoras e das características e propriedades da mulita obtida a partir de cada uma delas. O estudo sugere que a utilização de sílicas e aluminas de alta reatividade favorece a mulitização reduzindo a temperatura de obtenção e a quantidade de fase líquida residual. Palavras-chave: mulita, mulitização, concreto refratário, sílica, alumina. Abstract Mullite is a ceramic phase currently applied in the refractory industries due to its excellent properties, high refractoriness and it

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Synthesis of mullite powder and its characteristics

Cited by 41 publications

References 11 publications

Characteristics of mullite prepared from co-precipitated 3Al2O3·2SiO2 powders

Characteristics of mullite prepared from co-precipitated 3Al2O3·2SiO2 powders

New data on the thermal analysis of diphasic mullite gel

Mulitização em refratários utilizando diferentes fontes precursoras: revisão

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