Flow behaviour characterization of Hydroxyapatite for powder injection moulding (PIM)

Farrahshaida Mohd Salleh, Abu Bakar Sulong, Farhana Foudzi, Mohamed Intan Fadhlina, Natasha Emira Azaman, Najlaa Nazihah Mas'ood, Seong Jin Park

Research output: Contribution to journalArticle

Abstract

The selection and formulation of binder systems play an important role in powder injection moulding (PIM). The rheological properties of feedstock need to be controlled due to preventing any formation of defects during injection, debinding and sintering. For this study, the Hydroxyapatite (HA) feedstock was prepared by mixing with 40 vol% Palm Stearin (PS) and 60 vol% Polyethelyne (PE) binder system. Three feedstocks (F1, F2 and F3) at different powder loadings of 54, 55 and 56 vol%, respectively, were mixed using brabender mixer. The rheological properties of feedstock such as flow behaviour index, flow activation energy, and mouldability of the feedstocks were determined with a capillary rheometer. It was found that, all feedstocks exhibited pseudoplastic flow, which is an important requirement in PIM. The three feedstock flow behaviour indexes were n (0.16-0.24), and flow activation energies; E at shear rate at 1000s-1 was 5.36, 6.91 and 14.35 kJ/mol. In addition, F3 was found to be able to be injected in a wide range of temperature due to its low-flow behaviour index, low activation energy, and high mouldability index gathered from the rheological test.

Original languageEnglish
Pages (from-to)77-88
Number of pages12
JournalJournal of Mechanical Engineering
VolumeSI 3
Issue number1
Publication statusPublished - 1 Jan 2017

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Hydroxyapatite
Injection molding
Feedstocks
Powders
Activation energy
Binders
Rheometers
Shear deformation
Sintering
Defects

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Flow behaviour characterization of Hydroxyapatite for powder injection moulding (PIM). / Salleh, Farrahshaida Mohd; Sulong, Abu Bakar; Foudzi, Farhana; Intan Fadhlina, Mohamed; Azaman, Natasha Emira; Mas'ood, Najlaa Nazihah; Park, Seong Jin.

In: Journal of Mechanical Engineering, Vol. SI 3, No. 1, 01.01.2017, p. 77-88.

Research output: Contribution to journalArticle

Salleh, Farrahshaida Mohd ; Sulong, Abu Bakar ; Foudzi, Farhana ; Intan Fadhlina, Mohamed ; Azaman, Natasha Emira ; Mas'ood, Najlaa Nazihah ; Park, Seong Jin. / Flow behaviour characterization of Hydroxyapatite for powder injection moulding (PIM). In: Journal of Mechanical Engineering. 2017 ; Vol. SI 3, No. 1. pp. 77-88.
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