Sintering kinetics of the powder during fields-activated micro-forming and sintering (Micro-FAST) of copper micro-gears

Kunlan Huang, Yi Yang, Yi Qin

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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Abstract

Forming of micro-components from powder with fields-activated sintering technology (FAST) renders different forming and sintering mechanisms, comparing to that occurring during the forming of macro-sized components with a similar technology. Establishing a good understanding of these mechanisms would help process design and control aiming at achieving desired quality of the components to be formed. This paper presents a study and the results on the sintering kinetics of the powder during Micro-FAST for the fabrication of micro-gears (the module is 0.2 and the pitch diameter 1.6 mm) from copper powder. The results showed that the densification of copper powder is related largely to the bulk plastic-deformations of the particles and the melting of the particles at contact interfaces. Particularly, it is revealed that plastic deformations of the copper particles mainly occurred at approximately 340 °C and melting of the particle-interfaces at approximately 640 °C. Differently, in a densification process with a traditional powder sintering method, grain growth and neck growth would, normally, be two dominant mechanisms that achieve the densification of powder.
Original languageEnglish
Title of host publicationMetal Forming 2014
Subtitle of host publicationSelected, Peer Reviewed Papers from the 15th International Conference on Metal Forming 2014, September 21-24, 2014, Palermo, Italy
EditorsFabrizio Micari, Livan Fratini
Place of PublicationPfaffikon, Switzerland
Pages854-860
Number of pages7
Volume622-623
DOIs
Publication statusPublished - 21 Sep 2014
Event15th International Conference on Metal Forming - Palermo, Italy
Duration: 21 Sep 201424 Sep 2014

Publication series

NameKey Engineering Materials
PublisherTrans Tech Publications Ltd
Volume622-623
ISSN (Print)1013-9826

Conference

Conference15th International Conference on Metal Forming
CountryItaly
CityPalermo
Period21/09/1424/09/14

Keywords

  • field-activated sintering technology (FAST)
  • micro-forming
  • sintering kinetics
  • copper
  • copper powder
  • deformation
  • densification
  • forming
  • grain growth
  • kinetics
  • melting
  • metal forming
  • microfabrication
  • microoptics
  • plastic deformation
  • powder metals
  • activated sintering
  • densification process
  • particle interface
  • powder sintering methods
  • process design and control
  • sintering mechanism

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