EFFECT OF SPINEL ADDITION ON THE SINTERING BEHAVIOR AND MICROSTRUCTURE OF ALUMINA-SPINEL CERAMICS
Sintering behaviors of alumina-spinel powder mixtures were investigated up to 1600oC using a vertical dilatometer. Final density and microstructure of pure alumina, magnesium aluminate spinel (MgAl2O4) ceramics and ceramic composites with different alumina-spinel ratio were examined. As a result, th...
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| Format: | Article |
| Language: | English |
| Published: |
University of Chemistry and Technology, Prague
2014-12-01
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| Series: | Ceramics-Silikáty |
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| Online Access: |
http://www.ceramics-silikaty.cz/2014/pdf/2014_04_314.pdf
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| Summary: | Sintering behaviors of alumina-spinel powder mixtures were investigated up to 1600oC using a vertical dilatometer. Final
density and microstructure of pure alumina, magnesium aluminate spinel (MgAl2O4) ceramics and ceramic composites with
different alumina-spinel ratio were examined. As a result, the densification and final density of alumina-spinel composites
were affected by addition of 10 wt. % and 20 wt. % spinel into alumina. Non-stoichiometric alumina-rich spinel phase was
detected in the matrix of the composites by EDS. The presence of spinel phase inhibited alumina grain growth, therefore
the pure alumina sample had nearly twice the grain size as the multiphase alumina-spinel samples. Vickers hardness of the
samples was tested and compared. The hardness of the composite with 10 wt. % spinel was slightly higher than the pure
alumina ceramic, due to grain size and density of the samples. |
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| ISSN: | 0862-5468 1804-5847 |