Sinteran Hidroksiapatit dalam atmosfera Nitrogen untuk peningkatan sifat Mikrokekerasan

Translated title of the contribution: Sintering of Hydroxyapatite under Nitrogen atmosphere for improved microhardness

Leong Chee Huan, Andanastuti Muchtar, Tan Chou Yong, Masfueh Razali, Chin Chuin Hao

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Hydroxyapatite (HA) is a type of calcium phosphate which constitutes most of the mineral phase of bones and tooth enamel. HA is biocompatible and osteoconductive; it also exhibits excellent chemical and biological affinity with bone tissues. With these characteristics, HA has been widely used as bone graft and coating material for human hard tissue implants. However, the brittleness and low fracture toughness of sintered HA limit its capability in load-bearing applications. This study focuses on determining the effect of sintering in nitrogen gas (N2) atmosphere on the mechanical properties of HA. HA nanopowders were characterised using a transmission electron microscope. Next, HA powders were uniaxially pressed into pellets. The pellets were then isostatically cold-pressed and sintered in two types of atmospheres, namely, sintering in N2 and sintering in air at 1300°C. The density, microstructure, phase stability and microhardness of sintered HA were characterised. Overall, sintering in N2 led to the formation of larger grains with higher relative density and microhardness than sintering in air. In this study, HA sintered in N2 at 1300°C exhibited more compact microstructure with higher relative density (94%) and microhardness (4.07 GPa) without decomposition in comparison to sintering in air. In conclusion, N2 sintering at 1300°C improves the Vickers hardness of HA by yielding a more compact microstructure.

Original languageMalay
Pages (from-to)1635-1640
Number of pages6
JournalSains Malaysiana
Volume46
Issue number9
DOIs
Publication statusPublished - 1 Sep 2017

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Hydroxyapatite
Microhardness
Sintering
Nitrogen
Bone
Microstructure
Bearings (structural)
Air
Tooth enamel
Tissue
Phase stability
Vickers hardness
Calcium phosphate
Brittleness
Grafts
Fracture toughness
Electron microscopes
Minerals
Decomposition
Powders

ASJC Scopus subject areas

  • General

Cite this

Sinteran Hidroksiapatit dalam atmosfera Nitrogen untuk peningkatan sifat Mikrokekerasan. / Huan, Leong Chee; Muchtar, Andanastuti; Yong, Tan Chou; Razali, Masfueh; Hao, Chin Chuin.

In: Sains Malaysiana, Vol. 46, No. 9, 01.09.2017, p. 1635-1640.

Research output: Contribution to journalArticle

Huan, Leong Chee ; Muchtar, Andanastuti ; Yong, Tan Chou ; Razali, Masfueh ; Hao, Chin Chuin. / Sinteran Hidroksiapatit dalam atmosfera Nitrogen untuk peningkatan sifat Mikrokekerasan. In: Sains Malaysiana. 2017 ; Vol. 46, No. 9. pp. 1635-1640.
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