Sintering of nano structural WC with cobalt matrix synthesised from soluble raw materials

Juha Lagerbom, Ulla Kanerva, Marjaana Karhu, Erja Turunen, Juho Lotta, Erkin Cura, Simo-Pekka Hannula

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Nano sized tungsten carbide WC powder was synthesised using water soluble raw materials. Ammonium metatungstate AMT and glycine were applied as tungsten and carbon sources. They were dissolved in water and spray-dried before thermal synthesis in argon atmosphere. The particle size was in average 50 nm and grain size was in average 12-13 nm. The synthesized nano size tungsten carbide powder and commercial submicron and micron tungsten carbide powders were mixed with cobalt powder with a ratio of 80:20 by weight. The powders were consolidated by spark plasma sintering under vacuum at 1180ºC. The effect of powder properties and phase structure on sintering mechanism was investigated. Mechanical and microstructure evaluation of the sintered compacts were carried out by dynamic indentation, electron microscopy and X-ray diffraction. The influence of grain growth of the carbides on mechanical properties was evaluated. The decomposition of fine carbides was also investigated.
Original languageEnglish
Title of host publicationEURO PM2015 congress proceedings
PublisherEuropean Power Metallurgy Association EPMA
ISBN (Electronic)978-1-899072-47-7
Publication statusPublished - 2015
MoE publication typeA4 Article in a conference publication
EventEuro PM2015 Power Metallurgy Congress and Exhibition, - Reims, France
Duration: 4 Oct 20157 Oct 2015

Conference

ConferenceEuro PM2015 Power Metallurgy Congress and Exhibition,
Abbreviated titleEuro PM2015
CountryFrance
CityReims
Period4/10/157/10/15

Keywords

  • PM
  • WC
  • wear
  • nano
  • ProperPart

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