EFFECTS OF NANO-ZrO₂ ADDITIVE ON THE PHASE TRANSFORMATION AND DENSIFICATION OF ZrO₂-MgAl₂O₄ CERAMICS PREPARED BY SINGLE-STAGE SRS PROCESS

A series of ZrO₂-MgAl₂O₄ ceramics with additions of 0, 2.5wt%, 5.0wt% and 7.5wt% nano-ZrO₂ were successfully fabricated at 1580 °C for 4 h from powders of commercial Al₂O₃ and calcined MgO by single-stage solid state reaction sintering (SRS) method. Effects of nano-ZrO₂ additive on the phase composi...

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Bibliographic Details
Published inCeramics (Praha) Vol. 62; no. 1; pp. 1 - 7
Main Authors Yaran Zhang, Beiyue Ma, Su Chang, Yu Jingkun, Li Guangqiang, Zhu Qiang
Format Journal Article
LanguageEnglish
Published University of Chemistry and Technology, Prague 01.01.2018
Subjects
Densification
MgAl₂O
Nano-ZrO
Phase transformation
Reaction sintering
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Summary:A series of ZrO₂-MgAl₂O₄ ceramics with additions of 0, 2.5wt%, 5.0wt% and 7.5wt% nano-ZrO₂ were successfully fabricated at 1580 °C for 4 h from powders of commercial Al₂O₃ and calcined MgO by single-stage solid state reaction sintering (SRS) method. Effects of nano-ZrO₂ additive on the phase compositions, microstructures and bulk density of the ceramics were investigated. Nano-ZrO₂ additive was found to remarkably promote the sintering densification and improve the microstructure of the ceramics. Uniform, dense and fine microstructures are obtained, and the mean grain size of MgAl₂O₄ particles is about 2 μm. The as-prepared ceramics mainly consist of MgAl₂O₄ and c-ZrO₂ (cubic-Ca0.15Zr0.85O1.85), due to the reaction between Al₂O₃ and MgO as well as the nano-ZrO₂ additive and CaO stabilizer. The formation process of the ceramics mainly includes the synthesis of MgAl₂O₄ and the conversion process of m-ZrO₂ to c-ZrO₂ under the stabilizing action of CaO.
ISSN:0862-5468
1804-5847
DOI:10.13168/cs.2017.0038