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Previous issue date: 2016-10-10 / O surgimento de materiais comp?sitos tem o objetivo de se encontrar propriedades
especificas desejadas para determinadas aplica??es, como melhor resist?ncia mec?nica,
materiais mais leves, economicamente vi?vel, materiais recicl?veis e etc.Nessa
perspectiva estudou-se a viabilidade do uso da palha de a?o para a obten??o de um
comp?sito de matriz polim?rica. Foram testadas tr?s formula??es, com 10%, 15% e
20% de fibras do comp?sito. Para a caracteriza??o do comp?sito foram determinadas
propriedades t?rmicas (condutividade, capacidade t?rmica, difusividade e resistividade),
mec?nicas (tra??o e flex?o) e fisioqu?micas (MEV, DRX, densidade, absor??o
e degrada??o). O comp?sito, em suas tr?s formula??es, apresentou resist?ncia mec?nica
superior a quase totalidade dos comp?sitos j? estudados no laborat?rio LMHES.
Essa maior capacidade de resist?ncia mec?nica esteve associada a utiliza??o de um
fibra met?lica. No que diz respeito as propriedades t?rmicas, o comp?sito estudado
apresentou uma menor capacidade de isolamento t?rmico que os outros comp?sitos
anteriormente estudados. O comp?sito apresentou maior viabilidade para a absor??o
de umidade e resist?ncia mec?nica. o pior resultado deu-se para aplica??es t?rmica
onde sua condutividade t?rmica est? acima da maioria dos comp?sitos polim?rico
mostrados pela literatura, em fun??o da utiliza??o de uma fibra met?lica. Foram realizados
ensaios mec?nicos, t?rmicos dentre outros, apresentando ?timos resultados
devido as propriedades espec?ficas do comp?sito proposto como resist?ncia a flex?o,
e boa resist?ncia ? absor??o de meios aquosos. As propriedades do comp?sito pode
ser utilizado para a fabrica??o de estruturas que n?o requeiram significativa resist?ncia
mec?nica na tra??o, como por exemplo, prot?tipos solares e e?licos, como fornos
e fog?es solares e p?s de aerogeradores. / Composite materials arise from the need of finding desired properties for certain applications,
such as better mechanical resistance, lighter materials, cost-effectiveness,
recyclable material, etc. The difficulties of disposal, recycling or reuse are now environmental
concerns and therefore subject matter of much research. In this perspective
we studied the feasibility of using steel wool for obtaining a polymeric matrix composite.
Three formulations were tested, 10%, 15% and 20% of composite fibers. For the
characterization of the composite were determined thermal properties (conductivity,
heat capacity, diffusivity and resistivity), mechanical properties (traction and bending)
and physiochemical properties (SEM, XRD, density, absorption and degradation). The
composite in its three formulations had higher mechanical strength compared to almost
all composites that have already been studied in the laboratory LMHES. This greater
mechanical resilience was associated with the use of a metallic fiber. Regarding the
thermal properties, the composite studied had a lower thermal insulation than other
composites studied previously. The composite showed higher viability for humidity absorption
and mechanical resilience. The worst result was in thermal applications where
its thermal conductivity is above of most polymeric composites found in the literature,
due to the use of a metallic fiber. Some tests were made, such as mechanical, thermal,
among other tests, showing excellent results because of the specific properties of the
composites proposed, namely flexural strength, and good resistance to absorption in
aqueous environment. The properties of such composite can be used to make structures
that do not require significant mechanical resilience in traction, for instance in
solar and wind prototypes, such as ovens and solar powered cookers and wind generator
blades.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22520 |
| Date | 10 October 2016 |
| Creators | Mac?do Neto, Miguel Cabral de |
| Contributors | 25094955420, http://lattes.cnpq.br/0801747108308706, Gomes, Iverton Rodrigo Barbosa, 01185591419, http://lattes.cnpq.br/0701437929541956, Aquino, Marcos Silva de, 47426632415, http://lattes.cnpq.br/8780485157382325, Mota, Maria Kalionara de Freitas, 05095942470, http://lattes.cnpq.br/6791276267509274, Melo, Mois?s Vieira de, 10774556404, http://lattes.cnpq.br/1337846419129004, Souza, Luiz Guilherme Meira de |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA MEC?NICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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