Microstructure and Mechanical Properties of ZrO2 Toughened Mullite Synthesized by Sol-Gel Method

Ismail, M. G. M. U.; Shiga, Hiroshi; Katayama, Keiichi; Nakai, Zenjiro; Akiba, T.; Sōmiya, Shigeyuki

doi:10.1007/978-94-011-2882-7_38

Cited by 1 publication

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“…For this reason zirconia additions are often used to enhance the mechanical properties in mullite-based ceramics. [2][3][4] Improved properties can be the result of transformation and microcrack toughening 10,11 as well as the formation of metastable solid solutions between ZrO 2 and mullite. 7,8 Addition of zirconia also enhances the sintering of SCA through viscous flow, 12 contrary to the usual effect of the rigid inclusions in the viscous matrix.…”

Section: Introductionmentioning

confidence: 99%

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Sintering and Microstructure Modification of Mullite/Zirconia Composites Derived from Silica‐Coated Alumina Powders

Yaroshenko

Wilkinson

2001

Journal of the American Ceramic Society

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This paper addresses the densification and microstructure development during firing of mullite/zirconia composites made from silica-coated-alumina (SCA) microcomposite powders. Densification occurs in two stages: in the presence of a silica-alumina mixture and after conversion to mullite. The first stage of densification occurs through transient viscous phase sintering (TVS). This is best promoted by rapid heating, which delays the crystallization of silica to higher temperatures. A further sintering stage is observed following mullitization. The introduction of seeds promotes solid-state sintering, most probably due to refinement of the mullite matrix. For seed concentrations up to about 1% the sintering kinetics depend on seed concentration. This suggests that nucleation still remains the rate-controlling mullitization step. Above this concentration the reaction becomes growth controlled. Introduction of seeds also promotes direct mullitization without transient zircon formation that was observed in a previous study of the same process without seeding. Seeding also promotes the development of elongated grains by way of a solid-state recrystallization process.

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Section: Introductionmentioning

confidence: 99%

“…7,8 Addition of zirconia also enhances the sintering of SCA through viscous flow, 12 contrary to the usual effect of the rigid inclusions in the viscous matrix. 10 The reason for this increase in sintering rate at the low-temperature stage of sintering is not yet clear.…”

Section: Introductionmentioning

confidence: 99%

Sintering and Microstructure Modification of Mullite/Zirconia Composites Derived from Silica‐Coated Alumina Powders

Yaroshenko

Wilkinson

2001

Journal of the American Ceramic Society

View full text Add to dashboard Cite

show abstract

Microstructure and Mechanical Properties of ZrO2 Toughened Mullite Synthesized by Sol-Gel Method

Cited by 1 publication

References 3 publications

Sintering and Microstructure Modification of Mullite/Zirconia Composites Derived from Silica‐Coated Alumina Powders

Sintering and Microstructure Modification of Mullite/Zirconia Composites Derived from Silica‐Coated Alumina Powders

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