Preparação de compósitos alumina-mulita de baixo custo via sinterização reativa entre uma argila caulinítica da Paraíba e hidróxido de alumínio
This work aimed to evaluate the effects of processing on microstructure and properties of alumina-mullite composites via reactive sintering of a mixture of kaolinite clay and aluminum hydroxide. Cylindrical pellets were pressed at 40 MPa and sintered between 1300 and 1600 °C. The technological pro...
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| Principais autores: | , , , , , |
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| Formato: | article |
| Idioma: | pt_BR |
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/31605 |
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| Resumo: | This work aimed to evaluate the effects of processing on microstructure and properties of alumina-mullite composites via reactive
sintering of a mixture of kaolinite clay and aluminum hydroxide. Cylindrical pellets were pressed at 40 MPa and sintered between
1300 and 1600 °C. The technological properties were determined as a function of sintering temperature. The evaluation of
crystalline phases and microstructure was performed by X-ray diffraction and electron microscopy. Structural results indicate
the attainment of mullite and alumina at 1300 °C. Apparent porosity below 0.8% and flexural strength higher than 40 MPa were
obtained for sintering temperatures above 1450 °C. A flexural strength as high as 70 MPa was obtained after sintering at 1600 °C.
This study demonstrates the possibility of preparing low cost alumina-mullite composites with technological properties compatible
with those of ceramics produced by companies with large operations in the international market of refractory products |
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