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Hard Materials - Processing 1: Sintering of Nano Structural WC with Cobalt Matrix Synthesised from Soluble Raw Materials
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Hard Materials - Processing 1: Sintering of Nano Structural WC with Cobalt Matrix Synthesised from Soluble Raw Materials
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Conference Proceeding
Hard Materials - Processing 1: Sintering of Nano Structural WC with Cobalt Matrix Synthesised from Soluble Raw Materials
2015
Overview
Nano sized tungsten carbide powder was synthesised using water soluble raw materials. Ammonium metatungstate 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 50 nm in average and grain size was 12-13 nm in average. The synthesized nano size tungsten carbide powder and commercial submicron and micron tungsten carbide powders were mixed with cobalt powder with a ratio of 90:10 by weight. The powders were consolidated by pulsed electric current sintering under vacuum at 1100°C to relative density of approximately 99%. 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.
Publisher
The European Powder Metallurgy Association
Subject
