Influência do teor e granulometria da calcita e da temperatura de sinterização no desenvolvimento de massas cerâmicas para revestimento poroso(BIII)
This work aims at studying the influence of the concentration of calcite, its grain size and sintering temperature to obtain porous coating formulations that meet the design specifications. The experiments involved the physical-chemical and mineralogical caracterization of the raw materials, and mec...
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| Formato: | doctoralThesis |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/15903 |
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| Resumo: | This work aims at studying the influence of the concentration of calcite, its grain size and
sintering temperature to obtain porous coating formulations that meet the design specifications.
The experiments involved the physical-chemical and mineralogical caracterization of the raw
materials, and mechanical tests on specimens dried and sintered, performing a planning mixture
and factorial experiment, using the response surface methodology. The ceramic bodies studied
were prepared by dry process, characterized, placed in conformity by uniaxial pressing and
sintered at temperatures of 940 º C, 1000ºC, 1060ºC, 1120°C and 1180°C using a fast-firing
cycle. The crystalline phases formed during sintering at temperatures under study, revealed the
presence of anorthite and wolastonite, and quartz-phase remaining. These phases were mainly
responsible for the physical and mechanical properties of the sintered especimens. The results
shown that as increases the participation of carbonate in the composition of ceramic bodies there
is an increase of water absorption and a slight reduction in linear shrinkage for all sintering
temperatures. As for the mechanical strength it was observed that it tended to decrease for
sintering at temperatures between 940 ° C and 1060 ° C and to increase for sintering at
temperatures above 1060 ° C occurring with greater intensity for compositions with higher
content of calcite. The resistence decreased with increasing participation of quartz in all sintering
temperatures. The decrease in grain size of calcite caused a slight increase in water absorption for
formulation with the same concentration of carbonate, remaining virtually unchanged the results
of linear shrinkage and mechanical strength. In conclusion, porous ceramic coating (BIII) can be
obtained using high concentrations of calcite and keeping the properties required in technical
standards and that the particle size of calcite can be used as tuning parameter for the properties of
ceramic products. |
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