Rheological properties of cemented tungsten carbide feedstock for micro powder injection

Abdolali Fayyaz, Norhamidi Muhamad, Abu Bakar Sulong, Heng Shye Yunn, Sri Yulis M Amin, Javad Rajabi

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

3 Citations (Scopus)

Abstract

The rheological behavior of feedstock needs to be examined for manufacturing parts without defects by micro powder injection molding (μPIM). In this study, submicron tungsten carbide (WC) and cobalt (Co) were milled for several hours. The distribution and morphology of the powder mixture were analyzed by laser diffraction and scanning electron microscopy. After measurement of critical powder loading, cemented tungsten carbide (WC-Co) powder was mixed with a thermoplastic/paraffin wax binder with a powder loading volume from 50% to 52% to obtain feedstock. The flow properties of the WC-Co feedstock were evaluated using a capillary rheometer at different temperatures. It was found that feedstock exhibit a pseudoplastic flow behavior, which is one of the main requirements for μPIM. Feedstock is also shown to be highly sensitive to temperature at high powder loading. Low powder loading led to low viscosity at a high shear rate that cannot be used in μPIM because it results in powder and binder separation.

Original languageEnglish
Title of host publicationMaterials Science Forum
Pages827-832
Number of pages6
Volume773-774
DOIs
Publication statusPublished - 2014
Event15th International Conference on Advances in Materials and Processing Technologies, AMPT 2012 - Wollongong, NSW
Duration: 23 Sep 201223 Sep 2012

Publication series

NameMaterials Science Forum
Volume773-774
ISSN (Print)02555476

Other

Other15th International Conference on Advances in Materials and Processing Technologies, AMPT 2012
CityWollongong, NSW
Period23/9/1223/9/12

Fingerprint

tungsten carbides
Tungsten carbide
Powders
Feedstocks
injection
injection molding
Cobalt
Injection molding
cobalt
Binders
tungsten carbide
Paraffin waxes
rheometers
waxes
Rheometers
paraffins
Shear deformation
Thermoplastics
manufacturing
Diffraction

Keywords

  • Binder
  • Cemented tungsten carbide (WC-Co)
  • Hardmetal
  • Micro powder injection molding (μPIM)
  • Rheology

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Fayyaz, A., Muhamad, N., Sulong, A. B., Yunn, H. S., Amin, S. Y. M., & Rajabi, J. (2014). Rheological properties of cemented tungsten carbide feedstock for micro powder injection. In Materials Science Forum (Vol. 773-774, pp. 827-832). (Materials Science Forum; Vol. 773-774). https://doi.org/10.4028/www.scientific.net/MSF.773-774.827

Rheological properties of cemented tungsten carbide feedstock for micro powder injection. / Fayyaz, Abdolali; Muhamad, Norhamidi; Sulong, Abu Bakar; Yunn, Heng Shye; Amin, Sri Yulis M; Rajabi, Javad.

Materials Science Forum. Vol. 773-774 2014. p. 827-832 (Materials Science Forum; Vol. 773-774).

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

Fayyaz, A, Muhamad, N, Sulong, AB, Yunn, HS, Amin, SYM & Rajabi, J 2014, Rheological properties of cemented tungsten carbide feedstock for micro powder injection. in Materials Science Forum. vol. 773-774, Materials Science Forum, vol. 773-774, pp. 827-832, 15th International Conference on Advances in Materials and Processing Technologies, AMPT 2012, Wollongong, NSW, 23/9/12. https://doi.org/10.4028/www.scientific.net/MSF.773-774.827
Fayyaz A, Muhamad N, Sulong AB, Yunn HS, Amin SYM, Rajabi J. Rheological properties of cemented tungsten carbide feedstock for micro powder injection. In Materials Science Forum. Vol. 773-774. 2014. p. 827-832. (Materials Science Forum). https://doi.org/10.4028/www.scientific.net/MSF.773-774.827
Fayyaz, Abdolali ; Muhamad, Norhamidi ; Sulong, Abu Bakar ; Yunn, Heng Shye ; Amin, Sri Yulis M ; Rajabi, Javad. / Rheological properties of cemented tungsten carbide feedstock for micro powder injection. Materials Science Forum. Vol. 773-774 2014. pp. 827-832 (Materials Science Forum).
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