Effect of dry and wet ball milling process on critical powder loading and mixture properties of fine WC-10Co-0.8VC powder

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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Micro powder injection molding (μPIM) has great potential for the production of micro cemented carbide parts that require high hardness and toughness. The main stages of the μPIM process include mixing the powder and organic binder, injecting, debinding, and sintering. High critical solid loading of submicron tungsten carbide (WC) powder is one of the requirements in the micro powder injection molding process, which is not obtained easily. This paper investigates the effects of ball milling on critical solid loading of submicron WC. Dry and wet ball milling processes were used to prepare a powder mixture with composition of WC-10Co-0.8VC (wt-%). Critical powder volume concentration (CPVC) was determined using the torque variation method, and the powder characteristics were assessed using scanning electron microscopy and energy dispersive X-ray spectroscopy. CPVC was at 42% and 50% for the dry and wet ball milling processes, respectively. Apparent and tap densities of the powder mixture were achieved at 2.4 g/cm3 and 2.96 g/cm3 after dry milling and at 2.54 g/cm3 and 3.39 g/cm3 after wet milling, respectively. Wet ball milling causes fine particles to de-agglomerate and improves the critical solid loading, which is advantageous for submicron cemented tungsten carbide injection molding. The homogeneity of the powder mixture can improve under longer time of wet milling process and it can be expected that reduce microstructure defects in sintered components.

Original languageEnglish
Pages (from-to)141-144
Number of pages4
JournalJurnal Teknologi (Sciences and Engineering)
Volume59
Issue numberSUPPL.2
Publication statusPublished - 2012

Fingerprint

Ball milling
Powders
Injection molding
Tungsten carbide
Milling (machining)
Toughness
Binders
Carbides
Sintering
Torque
Hardness
Defects
Microstructure
Scanning electron microscopy

Keywords

  • Ball milling
  • Cemented tungsten carbide (WC-Co)
  • Micro powder injection molding (μPIM)
  • Mixture physical properties

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Effect of dry and wet ball milling process on critical powder loading and mixture properties of fine WC-10Co-0.8VC powder. / Fayyaz, Abdolali; Muhamad, Norhamidi; Sulong, Abu Bakar; Yunn, Heng Shye; Amin, Sri Yulis M; Rajabi, Javad.

In: Jurnal Teknologi (Sciences and Engineering), Vol. 59, No. SUPPL.2, 2012, p. 141-144.

Research output: Contribution to journalArticle

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