Critical solid loading and rheological study of WC-10%Co

Heng Shye Yunn, Norhamidi Muhamad, Abu Bakar Sulong, Abdolali Fayyaz, Haw Pei Li

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

6 Citations (Scopus)

Abstract

Micro powder injection molding (μPIM) is a preferred technology for the production of micro parts or micro structured parts which derived from the well known thermoplastic injection molding technique. It is suitable for a large-scale production of ceramic and metallic parts without final machining. In the hardmetal industry, submicron and ultrafine hardmetals are the most demanding and also the fastest growing grades in production and application. Four stages involve in μPIM are mixing, injection, debinding and sintering. The volumetric ratio of solid powder to the total volume of powder and binder, which is usually called powder loading, largely determines the success or failure of subsequent processes. Critical solid loading of the powder can be estimated by torque variation, density, melt flow, density and viscosity versus composition. In this paper, critical solid loading of WC-10%Co is determined using torque variation method and its rheological behavior is studied. During the process, the wet surface of the powder particle WC-10%Co will cohesive together and resulted to the torque. Progressive powder is added-in after torque decrease and critical solid loading is identified when torque becomes unstable. Hence, critical solid loading WC-10%Co with WC (APS < 1 μm) is 46% and 42, 43 and 44 vol% of powder loading are selected to mix with wax-based binder system. The viscosity of feedstock show the pseudoplastic behavior and flow index (n) are 0.444, 0.491 and 0.492 for powder loading 42%, 43% and 44% respectively.

Original languageEnglish
Title of host publicationApplied Mechanics and Materials
Pages97-102
Number of pages6
Volume52-54
DOIs
Publication statusPublished - 2011
Event2011 1st International Conference on Mechanical Engineering, ICME 2011 - Phuket
Duration: 3 Apr 20114 Apr 2011

Publication series

NameApplied Mechanics and Materials
Volume52-54
ISSN (Print)16609336
ISSN (Electronic)16627482

Other

Other2011 1st International Conference on Mechanical Engineering, ICME 2011
CityPhuket
Period3/4/114/4/11

Fingerprint

Powders
Torque
Injection molding
Binders
Viscosity
Waxes
Feedstocks
Thermoplastics
Machining
Sintering
Chemical analysis
Industry

Keywords

  • Hardmetal
  • Micro powder injection molding (μPIM) critical solid loading
  • Rheology
  • Tungsten carbide

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Yunn, H. S., Muhamad, N., Sulong, A. B., Fayyaz, A., & Li, H. P. (2011). Critical solid loading and rheological study of WC-10%Co. In Applied Mechanics and Materials (Vol. 52-54, pp. 97-102). (Applied Mechanics and Materials; Vol. 52-54). https://doi.org/10.4028/www.scientific.net/AMM.52-54.97

Critical solid loading and rheological study of WC-10%Co. / Yunn, Heng Shye; Muhamad, Norhamidi; Sulong, Abu Bakar; Fayyaz, Abdolali; Li, Haw Pei.

Applied Mechanics and Materials. Vol. 52-54 2011. p. 97-102 (Applied Mechanics and Materials; Vol. 52-54).

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

Yunn, HS, Muhamad, N, Sulong, AB, Fayyaz, A & Li, HP 2011, Critical solid loading and rheological study of WC-10%Co. in Applied Mechanics and Materials. vol. 52-54, Applied Mechanics and Materials, vol. 52-54, pp. 97-102, 2011 1st International Conference on Mechanical Engineering, ICME 2011, Phuket, 3/4/11. https://doi.org/10.4028/www.scientific.net/AMM.52-54.97
Yunn HS, Muhamad N, Sulong AB, Fayyaz A, Li HP. Critical solid loading and rheological study of WC-10%Co. In Applied Mechanics and Materials. Vol. 52-54. 2011. p. 97-102. (Applied Mechanics and Materials). https://doi.org/10.4028/www.scientific.net/AMM.52-54.97
Yunn, Heng Shye ; Muhamad, Norhamidi ; Sulong, Abu Bakar ; Fayyaz, Abdolali ; Li, Haw Pei. / Critical solid loading and rheological study of WC-10%Co. Applied Mechanics and Materials. Vol. 52-54 2011. pp. 97-102 (Applied Mechanics and Materials).
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