Repositório do Conhecimento Institucional do Centro Universitário FEI
 

Engenharia de Materiais

URI permanente desta comunidadehttps://repositorio.fei.edu.br/handle/FEI/17

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2010 - 20122

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Autor: search.filters.author.AMBROZIO FILHO, F.Assunto: search.filters.subject.Sintering

Resultados da Pesquisa

Agora exibindo 1 - 2 de 2
  • N/D
    Artigo de evento 1 Citação(ões) na Scopus
    Influence of the composition and the tungsten particle size on the sintering of W-Cu composites
    (2010-10-10) COSTA, F. A. DA; SILVA, A. G. P. DA; AMBROZIO FILHO, F.; GOMES, U. U.
    Sintering is an alternative technique for producing W-Cu composites, but the system has a low sinterability. The increase of the sintered density for such a material is a need. The sintering mechanisms of W-Cu composites is investigated and the influence of the copper content and the tungsten particle size is analyzed by dilatometric measurements. The evolution of the structure during sintering is described. Copper plays the most important role for promoting densification. The sintering between the copper particles in contact is responsible for the densification in the solid state, but the main contribution is the rearrangement of the tungsten particles when copper melts. The higher the copper content the higher is the densification of the material. The use of fine tungsten and copper powders leads to higher densities and avoids the formation of large pores as copper melts.
  • N/D
    Artigo 4 Citação(ões) na Scopus
    Sintering of AISI M2 High Speed Steel with the Addition of NbC
    (2012-08-05) WENTZCOVITCH, A.; AMBROZIO FILHO, F.; SILVA, L. C. E.; Mauricio Neves
    The influence of adding 6 wt% (NbC) niobium carbide on the sintering temperature and microstructure of high speed steel - AISI M2 (0.87% C, 5.00% Mo, 6.00% W, 4,00% Cr, 2.00% V and Fe bal.) powder was studied. The starting material was obtained by vacuum melting followed by atomization in water. The samples were axially cold compacted in a cylindrical matrix and then vacuum sintered at 1250 and 1350 °C. Dilatometry and differential scanning calorimetry measurements indicated an increase in sintering temperature with addition of niobium to the AISI M2 steel. Optical and scanning electron microscope observations revealed a microstructure with uniformly distributed niobium carbides.