Solid state reactions in the ZrO2 · SiO2 - αAl2O3 system

Rupo, E. Di; Anseau, M. R.

doi:10.1007/bf00552434

Cited by 50 publications

(19 citation statements)

References 12 publications

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“…In our studies on the zirconia-alumina [1,2,3] system prepared by reaction sintering, it has been noted that the thermal expansion of samples containing up to 32 wt % zirconia did not present any discontinuity between 1000 and 1200 ~ C. The present letter reports the results obtained. Arguments are presented which indicate the relationship between thermal expansion and the content of zircon, zirconia, alumina, mullite and porosity.…”

Section: Thermal Expansion O F Zircon-alumina Materials Prepared By Rsupporting

confidence: 54%

“…Indeed, in the case of the zircon-alumina system, the observed microstructure is due to the mechanisms of the reaction [1], namely, the decomposition of zircon into zirconia and silica, and the subsequent reaction of the silica and alumina to form an amorphous mullite phase with a sufficiently low viscosity to flow and completely surround the remaining zirconia grains.…”

Section: Thermal Expansion O F Zircon-alumina Materials Prepared By Rmentioning

confidence: 97%

“…It has been established [1] that the reaction proceeds through the formation of non-crystalline mullite, the amount of which can be as much as 15% depending on the temperature and on the initial molar ratio of the reactants (ZrSiO4-A12Oa).…”

Section: Thermal Expansion O F Zircon-alumina Materials Prepared By Rmentioning

confidence: 99%

“…Details on solid state reactions [1] in the zircon-alumina system as well as reaction sintering [2] and reaction hot pressing [3] procedures and mechanisms have been reported elsewhere.…”

Section: Thermal Expansion O F Zircon-alumina Materials Prepared By Rmentioning

confidence: 99%

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Thermal expansion of zircon-alumina materials prepared by reaction sintering

1981

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Section: Thermal Expansion O F Zircon-alumina Materials Prepared By Rsupporting

confidence: 54%

Section: Thermal Expansion O F Zircon-alumina Materials Prepared By Rmentioning

confidence: 97%

Section: Thermal Expansion O F Zircon-alumina Materials Prepared By Rmentioning

confidence: 99%

“…Details on solid state reactions [1] in the zircon-alumina system as well as reaction sintering [2] and reaction hot pressing [3] procedures and mechanisms have been reported elsewhere.…”

Section: Thermal Expansion O F Zircon-alumina Materials Prepared By Rmentioning

confidence: 99%

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Thermal expansion of zircon-alumina materials prepared by reaction sintering

1981

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“…The technical literature (2)(3)(4)(5)(6)(7)(8) contains reports on many processing routes to produce mullite-zirconia and aluminamullite-zirconia (AMZ) ceramics. However, owing to raw material availability and production-related costs, the most common routes are reaction sintering (4-6) and solid-state reaction between oxides (7,8).…”

Section: Introductionmentioning

confidence: 99%

Aspectos microestructurales de los refractarios con alúmina conteniendo agregados de MullitaâCircona

Ferrari¹,

Rodrigues²

2003

Bol. Soc. Esp. Ceram. Vidr.

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Refractory materials are often subjected to high temperatures and loads and their performance depends on their microstructural evolution during use. In this context, microstructural changes were monitored in alumina-based refractories containing mullite-zirconia aggregates and heat-treated at 1400°C and 1500°C for 2, 6, and 18 days. With the purpose of inducing in situ mullite formation, bricks containing microsilica were also prepared and heat-treated at 1500°C for 6 days for the sake of comparison. These heat treatments allowed for an evaluation of the use of refractories from the standpoint of temperature and time. In this work, scanning electron microscopy and X-ray diffraction analyses were made to identify the phases in the materials. The Rietveld method was also used for quantitative phase analyses. Interfacial reactions occurred between alumina and aggregates and between alumina and microsilica, causing the system to become mullitized. The effect of in situ-formed mullite was particularly evident in the results of the modulus of rupture of the materials containing microsilica. Creep tests revealed a reduction in the creep rate of materials treated at 1500°C for 18 days. Key words: refractories, microstructure, aggregate, Rietveld, creepAspectos microestructurales de los refractarios con alúmina conteniendo agregados de Mullita-Circona.El comportamiento de los materiales refractarios, cuando sometidos a altas temperaturas y a grandes esfuerzos mecánicos, está íntimamente relacionado con la evolución microestuctural, durante su uso. En este contexto, fue realizado un estudio de la evolución microestructural de los materiales refractarios de alumina conteniendo diferentes porcentajes de agregado de mullita-circona, sometidos a tratamientos térmicos por 2, 6 y 18 días, en temperaturas de 1400 y 1500 o C. Fueron confeccionados, algunos ladrillos conteniendo microsílice, con la idea de se introducir la formación de mullita en situ. Para la comparación de los ladrillos, fueron realizados tratamientos térmicos por un periodo de 6 días en 1500 o C. Estos tratamientos térmicos permitieron una aproximación del refractario en uso, considerando apenas el efecto del tiempo y la temperatura. En este trabajo, fueron utilizados, la microscopia electrónica de barrido y la difracción de rayos-X para identificación y caracterización de las fases presentes. Se aplicó el método de Rietveld para el análisis cuantitativo de las fases. Ocurrieron reacciones interfaciales entre la alúmina y los agregados, y entre la alúmina y la microsílice, como resultado de la mullitización del sistema. El efecto de la formación en situ de la mulita fue notado especialmente en los resultados del modulo de ruptura para los materiales que contienen microsílice. Las pruebas de fluencia revelaron la reducción de la tasa de deformación de los materiales tratados térmicamente por 18 días a 1500°C.

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