Pulsed Plasma Sintering of Pre-alloyed Fe-50Cu-25Nb Powders
Spark plasma sintering technique enables powders consolidation by using heat and pressure simultaneously at shorter times than conventional sintering techniques.In the present work,the pre-alloyed Fe-50Cu-25Nb powders was sintered via pulsed plasma.The main objective is to investigate the structure and microstructure features as a function of sintering temperature and to investigate the hardness behavior as a function of the sintering temperature variation to analyze its possible application as a bearing material.All the samples were prepared using as sintering parameters,temperatures of 700℃,750℃,and 800℃ and constant pressure of 35MPa during 3 minutes.The specimens were characterized by confocal microscopy,scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS)and X-ray diffraction.Relative density of bulk was determined by Archimedes principleand microhardness of constituents and hardness was evaluated in Vickers and Brinell scales,respectively.The microstructure was characterized by a matrix made of Cu with Nb and Fe rich particles indicating the occurrence of liquid phase sintering due to lower melting point of Cu.The microhardness of Nb rich particles raised with sintering temperature increase.Higher sintering temperatures provided the increase in relative density and hardness.Although the diffusion of the elements was not clear by EDS mapping,the formation of an intermetallic compound Fe2Nb at the higher temperature was found.
Spark plasma sintering Binder Fe-Cu-Nb Solubility Diffusion Hardness Relative density
Soffner Layzza T.da S. Rosa Joice M.B. Silva Keytiane de S. De Oliveira Bárbara F. De Carvalho Cássio S. Filgueira Marcello
LAMAV,State University of the North Fluminense Darcy Ribeiro,Campos dos Goytacazes,RJ,Brazil PROPEMM,Federal Institute of Espírito Santo,ES,Brazil
国际会议
北京
英文
1092-1097
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）