Fabrication of cemented tungsten carbide components by micro-powder injection moulding

Abdolali Fayyaz, Norhamidi Muhamad, Abu Bakar Sulong, Javad Rajabi, Yee Ning Wong

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Micro-powder injection moulding (micro-PIM) is an advanced net-shaping process for the fabrication of metal and ceramic complex micro-components. Cemented tungsten carbide (WC-Co) hardmetal is known for its high hardness and wear resistance in various applications. Micro-PIM is a new alternative manufacturing technique for hardmetal micro-parts. In this work, the fabrication of WC-Co components via a micro-PIM process was studied. A fine WC-10Co-0.8VC (wt.%) powder was mixed with a binder system consisting of paraffin wax, low density polyethylene and stearic acid. A micro-component was injected at low pressure using a semi-automatic injection moulding machine. The injection temperature was determined from the rheological investigation of the feedstock. The binder extraction was carried out in solvent and thermal debinding methods under an argon atmosphere. Thermal gravimetric analysis was used to confirm the removal of the soluble binder from the green part. The sintering process has been performed within a temperature range of 1330-1450°C under vacuum. After sintering, a density of 94.5% theoretical density was obtained, which is a reasonable value. The micro-components showed length shrinkage between 16 and 22% and good surface quality and hardness values when compared with conventional powder metallurgy. This research shows that micro-PIM is able to produce small WC-Co components with properties comparable to conventional powder metallurgy.

Original languageEnglish
Pages (from-to)1436-1444
Number of pages9
JournalJournal of Materials Processing Technology
Volume214
Issue number7
DOIs
Publication statusPublished - Jul 2014

Fingerprint

Injection Molding
Tungsten carbide
Powder
Injection molding
Powders
Fabrication
Binders
Powder Metallurgy
Powder metallurgy
Sintering
Hardness
Paraffin waxes
Stearic acid
Argon
Gravimetric analysis
Low density polyethylenes
Polyethylene
Surface Quality
Thermal Analysis
Feedstocks

Keywords

  • Cemented tungsten carbide
  • Debinding
  • Micro-powder injection moulding
  • Powder metallurgy
  • Sintering

ASJC Scopus subject areas

  • Computer Science Applications
  • Modelling and Simulation
  • Ceramics and Composites
  • Metals and Alloys
  • Industrial and Manufacturing Engineering

Cite this

Fabrication of cemented tungsten carbide components by micro-powder injection moulding. / Fayyaz, Abdolali; Muhamad, Norhamidi; Sulong, Abu Bakar; Rajabi, Javad; Wong, Yee Ning.

In: Journal of Materials Processing Technology, Vol. 214, No. 7, 07.2014, p. 1436-1444.

Research output: Contribution to journalArticle

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