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Publikācija: Characterisation of Mullite-Zirconia Ceramics Produced from Different Synthesised Powders

Publication Type Full-text conference paper published in other conference proceedings
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Characterisation of Mullite-Zirconia Ceramics Produced from Different Synthesised Powders
Field of research 2. Engineering and technology
Sub-field of research 2.5 Materials engineering
Authors Gaida Maruta Sedmale
Ingunda Šperberga
Jānis Grabis
Aleksejs Hmeļovs
Lauma Lindiņa
Keywords Mullite, zirconia ceramics ,starting powders, properties
Abstract Mullite - zirconia ceramics was investigated using as starting components differently prepared powders. For synthesis of powders conventional and hydrothermal methods were applied. Characteristics of synthesised powders and their influence on sintering rate, phase composition and properties of mullite-zirconia ceramics were studied and compared. Compositions of Al2O3, SiO2•nH2O, ZrO2 (mon.), Y2O3 obtained by conventional method and of Al(NO)3.9H2O, SiO2–aeroc, ZrO(NO3).2H2O, Y(NO3)3 .6H2O obtained by hydrothermal preparing starting powders were used to satisfy the mullite – ZrO2 (tetr.) composition. The pressed samples were sintered at temperatures from 1100 to 15000C. It is shown that densification is greatly affected by milling time of conventional, as well as of hydrothermal preparing method. XRD and SEM examinations showed that there is a difference in the temperature of mullite - ZrO2 (tetr.) phase formation, as well as in morphology and grain size of sintered at 13000C samples.
Reference Sedmale, G., Šperberga, I., Grabis, J., Hmeļovs, A., Lindiņa, L. Characterisation of Mullite-Zirconia Ceramics Produced from Different Synthesised Powders. In: Global Roadmap for Ceramics: Proceedings of the 2nd International Congress on Ceramics, Italy, Verona, 29 Jun-4 Jul., 2008. Faenza: ISTEC-CNR, 2008, pp.201-207. ISBN 9788880800842.
ID 5463