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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Influência da adição de nanotubos de carbono nas propriedades mecânicas da liga AL-2%NI solidificadas direcionalmente / Influence of addition of carbon nanotubes on mechanical properties of AL-2%NI alloy directionally solidified

NASCIMENTO, Luiz Gabriel da Silva 27 November 2015 (has links)
Submitted by Cássio da Cruz Nogueira (cassionogueirakk@gmail.com) on 2017-02-03T11:45:45Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese_InfluenciaAdicaoNanotubos.pdf: 6893729 bytes, checksum: eae2f8951b81e53f035b40fce6837e00 (MD5) / Approved for entry into archive by Edisangela Bastos (edisangela@ufpa.br) on 2017-02-07T16:33:51Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese_InfluenciaAdicaoNanotubos.pdf: 6893729 bytes, checksum: eae2f8951b81e53f035b40fce6837e00 (MD5) / Made available in DSpace on 2017-02-07T16:33:51Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese_InfluenciaAdicaoNanotubos.pdf: 6893729 bytes, checksum: eae2f8951b81e53f035b40fce6837e00 (MD5) Previous issue date: 2015-11-27 / Neste trabalho foi fabricada uma matriz hipoeutética de Al-2%Ni e adicionado nela concentrações variadas de Nanotubos de Carbono, com o objetivo de verificar a evolução da resistência mecânica do novo material processado. O processo de fabricação do material estudado se deu por fundição e resfriamento brusco unidirecional ascendente, com extração transiente de fluxo de calor e determinação de variáveis térmicas de solidificação. Imagens de Microscopia Eletrônica de Varredura mostram o arranjo dos nanotubos na matriz e com a Espectroscopia Raman foi possível determinar as bandas “D” e “G” e analisar a ação do processo sobre os mesmos. Por meio de ensaios metalográficos e mecânicos foi possível caracterizar o comportamento macro, microestrutural e as propriedades mecânicas. O acréscimo de pequenas concentrações de nanotubos aumentou significativamente a resistência mecânica da matriz. / In this work, we produced a hypoeutectic Al-2wt%Ni matrix, to which we added various concentrations of carbon nanotubes, in order to evaluate the evolution of the mechanical strength of the new material. The manufacturing process occurred by melting and ascending unidirectional abrupt cooling, with extraction of the heat transient and determination of the thermal variables involved in the solidification. Scanning Electron Microscopy images show how the nanotubes are settled in the matrix, and by means of Raman Spectroscopy, we were able to determine the “D” and “G” bands and analyze the action of the process over them. By means of metallographic and mechanical tests, we were able to characterize the macro and micro-structural behaviors and the mechanical properties. The addition of small quantities of nanotubes led to a significant raise in the mechanical strength of the matrix.

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