Journal of South China University of Technology (Natural Science Edition) ›› 2005, Vol. 33 ›› Issue (9): 59-62.

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Fast Sintering of Iron-Based Powders with Constant Electric Current

Long Yan  Li Yuan-yuan  Li Xiao-giang  Wang Jun-Wen  Xia Wei   

  1. College of Mechanical Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2004-11-16 Online:2005-09-25 Published:2005-09-25
  • Contact: 龙雁(1973-)，女，博士生，主要从事粉末冶金新技术方面的研究 E-mail:ylongl@scut.edu.cn
  • About author:龙雁(1973-)，女，博士生，主要从事粉末冶金新技术方面的研究
  • Supported by:

    国家杰出青年基金资助项目(50325516)；教育部科技攻关项目(02153)；广东省科技攻关项目(2003A1070302)

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Abstract:

Iron·based mixed powders were fast consolidated via the sintering with constant electric current.To in-vestigate the sintering behavior of the powders,the microstructure and fracture surface morphology of the samples sintered at various durations were analyzed,and the electrical resistance,density and mechanical properties of the samples were measured.It is found that the formation of sintering necks and the diflusion of carbon into the iion matrix occur at a relatively low experimental temperature.In addition,some molten metal can be seen on the patti-cle interfaces,which means that a local high-temperature region is generated in the particle contacting regions at the earlier sintering stage.With the development of the sintering process,the density,transverse rupture strength and microhardness of the sintered sam ple increase,while the electrical resistance gradually decreases.

Key words: iron-based powder, electric curent, fast sintering