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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

Estudo da viabilidade de obtenção do metal patente por metalurgia do pó e comparação do desgaste com liga fundida e bronze sinterizado / Study the viability of obtaining White metal by powder metallurgy and wear compared with the cast alloy and sintered bronze

Klaas, Lucas Selonke 27 February 2013 (has links)
Made available in DSpace on 2016-12-08T17:19:20Z (GMT). No. of bitstreams: 1 Lucas Selonke Klaas.pdf: 5855700 bytes, checksum: f10fd37619590a5b128a3aec7c9e878c (MD5) Previous issue date: 2013-02-27 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / With the purpose of reduce wear in plain bearings, in initial turning periods, was evaluated tribologically the sintered metal patent in relation to the cast which is used in commercial bearings. In the present study have been conducted experiments using the dilatometer to determine the optimal temperature and time for sintering the white metal. In the sintered specimens was measured by scanning electron microscopy the sinterability. The need for this preliminary study is due to the difficulty in sintering of this alloy is as much difference in melting temperature between the three elements. Sliding wear tests were performed in tribometer pin-on-disc for evaluating the coefficient of friction and volume of material removed (as measured with the aid of profilometer) and compared with the white metal obtained by melting and bronze obtained by sintering. The wear mechanisms were analyzed by scanning electron microscopy. Of all configurations evaluated, the sintered bronze lubricated showed lower wear and sintered white metal lubricated had the lowest coefficient of friction. / Com o objetivo de reduzir o desgaste em mancais de deslizamento nos períodos iniciais de giro, foi avaliado tribologicamente o metal patente sinterizado como opção do fundido que é utilizado em mancais comerciais. No presente trabalho foram realizados experimentos com o dilatômetro para determinar a melhor temperatura e o tempo de sinterização para o metal patente. Nos corpos de prova sinterizados avaliou-se por meio do microscópio eletrônico de varredura a sinterabilidade. A necessidade desse estudo prévio dá-se pela dificuldade da liga na sinterização, pois há grande diferença de temperatura de fusão entre os três elementos. Aconteceram testes de desgaste por deslizamento com tribômetro de pino sobre disco para a análise do coeficiente de atrito e do volume de material removido (verificado com o auxílio de perfilômetro), além de depois terem sido comparados com o metal patente obtido por fundição e com o bronze oriundo da sinterização. Os mecanismos de desgaste foram observados por microscopia eletrônica de varredura. De todas as configurações examinadas, o bronze sinterizado lubrificado apresentou menor desgaste, e o metal patente sinterizado lubrificado teve o menor coeficiente de atrito

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