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Previous issue date: 2017-04-06 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A busca por materiais de alto valor agregado, alta aplicabilidade e elevada sustentabilidade motiva inova??es em todas as ?reas da engenharia. Um dos materiais desenvolvidos atualmente com tais requisitos s?o os carbetos dopados, que s?o compostos de cer?mica e metais. Este trabalho prop?e a s?ntese, caracteriza??o e avalia??o cin?tica do carbeto de tungst?nio dopado com cobalto (WC-Co). As etapas de produ??o do material s?o: s?ntese do precursor por via ?mida mediante agita??o em etanol de uma mistura de paratungstato de am?nio e nitrato de cobalto, secagem da lama obtida em mufla por 18h a 80?C, maceragem do p? seco, caracteriza??o preliminar usando as t?cnicas de MEV, DRX e EDS, rea??o g?s-s?lido de carborredu??o a 750, 800 e 850?C em atmosfera com 5% de metano e 95% hidrog?nio em reator de leito fixo e leito rotativo (agita??o de 34 rpm) e caracteriza??o final usando as t?cnicas j? citadas. Os resultados obtidos mostram um material contendo part?culas de carbeto de tungst?nio com o cobalto aderido de boa ?rea interfacial e aplic?vel a ?reas como: em catalisadores, reatores ? membrana e c?lulas combust?veis, o que ressalta a import?ncia desse tipo de pesquisa. / The search for high value-added materials, wide applicability and high sustainability encourages innovation in all areas of engineering. One of the materials currently being developed with such requirements are the doped carbides, which are composed with a mix of ceramics and metals. This work proposes the synthesis, characterization, kinetic evaluation and of tungsten carbide doped with cobalt (WC-Co) in fix and rotating bed reactor. The steps of material production was: synthesis of the precursor of washed by stirring in ethanol of a mixture of ammonium paratungstate and cobalt nitrate, drying th/e slurry obtained in oven for 18h at 80 ?C, the dry powder milling, preliminary characterization by SEM techniques, XRD and SDS, gas-solid reaction of reduction at 750, 800 and 850 ? C in an atmosphere of 5% methane and 95% hydrogen in fix bed and rotating bed reactor (at 34 rpm agitation) and the final characterization using the aforementioned techniques. The results show a material containing particles of tungsten carbide with cobalt adhered, with good interfacial and applicable in areas such as in catalysts, membrane reactors and fuel cells, which emphasizes the importance of such research.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/23396 |
| Date | 06 April 2017 |
| Creators | Tertuliano, Ruan S?vio da Costa |
| Contributors | 13681389420, http://lattes.cnpq.br/1030834608582624, Moriyama, Andr? Luis Lopes, 06663278401, http://lattes.cnpq.br/5552878900145656, Silva, Gilson Garcia da, 56634161453, http://lattes.cnpq.br/8681275097040450, Souza, Carlson Pereira de |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA QU?MICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| 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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