华南理工大学学报(自然科学版) ›› 2005, Vol. 33 ›› Issue (9): 59-62.

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铁基粉末的恒流电致快速烧结

龙雁 李元元 李小强 王郡文 夏伟   

  1. 华南理工大学 机械工程学院,广东 广州 510640
  • 收稿日期:2004-11-16 出版日期:2005-09-25 发布日期:2005-09-25
  • 通信作者: 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
  • 作者简介:龙雁(1973-),女,博士生,主要从事粉末冶金新技术方面的研究
  • 基金资助:

    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)

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)

摘要: 采用恒流电致烧结方法对铁基混合粉末进行了快速烧结,通过对不同通电时间烧结样品的显微组织、断1:7形貌进行分析,并对其电阻、密度及各项机械性能进行测试,研究了粉末的电致烧结行为.结果表明:在较低的测量温度下,粉末中出现了烧结颈,并发生了铁一碳的互扩散,且颗粒界面有局部熔化的迹象,证实电致烧结初期在颗粒接触区域存在局部高温;随着烧结过程的进行,烧结体的密度、横向断裂强度和显微维氏硬度均呈上升趋势,电阻则逐渐降低.

关键词: 铁基粉末, 电流, 快速烧结

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