Desenvolvimento e caracterização de filtros cerâmicos para aplicações a altas temperaturas
Ceramic filters are cellular structures that can be produced by various techniques, among which we highlight the replication method, or method of polymeric sponge. This method consists of impregnating polymeric foam with ceramic slurry, followed by heat treatment, where will occur decomposition o...
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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/123456789/12792 |
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| Resumo: | Ceramic filters are cellular structures that can be produced by various
techniques, among which we highlight the replication method, or method of polymeric
sponge. This method consists of impregnating polymeric foam with ceramic slurry,
followed by heat treatment, where will occur decomposition of organic material and
the sinter of the ceramic material, resulting in a ceramic whose structure is a replica
of the impregnated sponge. Ceramic filters have specific properties that make this
type of material very versatile, used in various technological applications such as
filters for molten metals and burners, make these materials attractive candidates for
high temperature applications. In this work we studied the systems Al2O3-LZSA
ceramic filters processed in the laboratory, and commercial Al2O3-SiC ceramics
filters, both obtained by the replica method, this work proposes the thermal and
mechanical characterization. The sponge used in the processing of filters made in
the laboratory was characterized by thermogravimetric analysis. The ceramic filters
were characterized by compressive strength, flexural strength at high temperatures,
thermal shock, permeability and physical characterization (density and porosity) and
microstructural (MEV and X-rays). From the results obtained, the analysis was made
of the mechanical behavior of these materials, comparing the model proposed by
Gibson and Ashby model and modified the effective area and the tension adjusted,
where the modified model adapted itself better to the experimental results,
representing better the mechanical behavior of ceramic filters obtained by the replica
method |
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