Characterization of the feedstock properties of metal injection-molded WC-Co with palm stearin binder system

Sri Yulis M Amin, Norhamidi Muhamad, Khairur Rijal Jamaludin, Abdolali Fayyaz, Heng Shye Yunn

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Feedstock preparation, as well as its characterization, is crucial in the production of highly sintered parts with minimal defect. The hard metal powder - particularly, cemented carbide (WC-Co) used in this study was investigated both physically and thermally to determine its properties before the mixing and injection molding stage. Several analyses were conducted, such as scanning electron microscopy, energy dispersive X-ray diffraction, pycnometer density, critical powder volume percentage (CPVP), as well as thermal tests, such as thermogravimetric analysis and differential scanning calorimetry. On the basis of the CPVP value, the feedstock, consisting of WC-Co powder, was mixed with 60% palm stearin and 40% polyethylene at an optimal powder loading, within 2 to 5% lower than the CPVP value. The CPVP spotted value was 65%. The feedstock optimal value at 61% showed good rheological properties (pseudoplastic behavior) with an n value lower than 1, considerably low activation energy and high moldability index. These preliminary properties of the feedstock serve as a benchmark in designing the schedule for the next whole steps (i.e. injection, debinding and sintering processes).

Original languageEnglish
Pages (from-to)123-128
Number of pages6
JournalSains Malaysiana
Volume43
Issue number1
Publication statusPublished - Jan 2014

Fingerprint

Feedstocks
Binders
Powders
Metals
Powder metals
Injection molding
Carbides
Thermogravimetric analysis
Polyethylenes
Differential scanning calorimetry
Sintering
Activation energy
X ray diffraction
Defects
Scanning electron microscopy

Keywords

  • Critical powder loading
  • Metal injection molding
  • Palm stearin
  • WC-Co

ASJC Scopus subject areas

  • General

Cite this

Characterization of the feedstock properties of metal injection-molded WC-Co with palm stearin binder system. / Amin, Sri Yulis M; Muhamad, Norhamidi; Jamaludin, Khairur Rijal; Fayyaz, Abdolali; Yunn, Heng Shye.

In: Sains Malaysiana, Vol. 43, No. 1, 01.2014, p. 123-128.

Research output: Contribution to journalArticle

Amin, Sri Yulis M ; Muhamad, Norhamidi ; Jamaludin, Khairur Rijal ; Fayyaz, Abdolali ; Yunn, Heng Shye. / Characterization of the feedstock properties of metal injection-molded WC-Co with palm stearin binder system. In: Sains Malaysiana. 2014 ; Vol. 43, No. 1. pp. 123-128.
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