Micro-powder injection molding (μPIM) of tungsten carbide

S. Y. Heng, M. R. Raza, Norhamidi Muhamad, Abu Bakar Sulong, A. Fayyaz

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Tungsten carbide (WC) is a well-known hard alloy material due to its hardness, resistance to wear and extensive applications. The current demand for WC in micro-applications is continually increasing. The production of micro-WC-10%Co parts through micro-powder injection molding (μPIM) technique is challenging for researchers. The thermal phenomenon plays a significant role during the μPIM of WC-Co due to its outstanding thermal conductivity. The heat transfer involved in the microinjection molding (Model: DSM explore) of WC-10%Co in this study is illustrated and highlighted. The mold temperature is demonstrated to influence microinjection molding due to the high thermal conductivity of WC-10%Co. A higher surface area-to-volume ratio of 1.25:1 is beneficial in the debinding process, in which the majority of the soluble organic binder is lost within the first 5 min. WC-10%Co sinters in the temperature range of 1380-1420 °C with a dwell time of 2 min during liquid phase sintering (LPS). The sintered part exhibits a densification of 96% of the theoretical density, a hardness of 1700 kg/mm2, a bending strength of 2100 MPa and a surface roughness of 1.17 μm. The consequential effect of the injection parameter by type and characteristic of powder during micro-powder injection molding are determined.

Original languageEnglish
Pages (from-to)189-195
Number of pages7
JournalInternational Journal of Refractory Metals and Hard Materials
Volume45
DOIs
Publication statusPublished - 2014

Fingerprint

Tungsten carbide
Injection molding
Powders
Molding
Thermal conductivity
Hardness
Liquid phase sintering
Densification
Bending strength
Binders
Surface roughness
Wear of materials
Heat transfer
Temperature
tungsten carbide

Keywords

  • Critical solid loading
  • Debinding
  • Micro-powder injection molding (μPIM)
  • Sintering
  • WC-10%Co

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry
  • Metals and Alloys
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Micro-powder injection molding (μPIM) of tungsten carbide. / Heng, S. Y.; Raza, M. R.; Muhamad, Norhamidi; Sulong, Abu Bakar; Fayyaz, A.

In: International Journal of Refractory Metals and Hard Materials, Vol. 45, 2014, p. 189-195.

Research output: Contribution to journalArticle

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