The Role of Carbon Source in the Production of Ultrafine and Nanocrystalline WC-6Co Cemented Carbides
Paper in proceedings, 2015

Tungsten carbide powders are typically produced either by carburization of tungsten metal powders (W) or by carbothermal reduction of tungsten oxide powders (WO3). Different powders can be used as carburizing source like carbon black and graphite. Synthesis of nanostructured WC powders is achieved by a two-step process: mechanical activation of initial powders (by milling), followed by thermal activation of mixes. The properties and microstructure of the resulting tungsten carbide powders (WC) can be influenced both by the raw materials and by the mixing / carburization conditions (temperature and atmosphere). This work presents the effect of the carbon source reactivity (synthetic graphite and different carbon black types) on the synthesis of nanocrystalline WC powders and ultrafine WC-6Co cemented carbides. This experimental work sets the basis for optimizing the production of nano-WC powders based on raw material selection and process conditions.

ultrafine cemented carbides

carbon black

reactivity

graphite

Nanocrystalline WC-powders

Author

Raffaele Gilardi

Imerys

Luigi Alzati

Imerys

Raquel Oro

Vienna University of Technology

Eduard Hryha

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Lars Nyborg

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Sigurd Berg

Höganäs

L Radicchi

Sigmacarb SA

roceedings EURO PM2015 Congress & Exhibition, 4-7 October 2015, Reims, France

1-6

Driving Forces

Sustainable development

Areas of Advance

Production

Materials Science

Subject Categories

Other Materials Engineering

Metallurgy and Metallic Materials

ISBN

978-1-899072-47-7

More information

Latest update

8/1/2018 3