Phase transformation on hydroxyapatite decomposition

Shih Fu Ou, Shi Yung Chiou, Keng Liang Ou

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The collapse of sintered hydroxyapatite (HA) has been attributed to HA decomposition; however, the detailed variations in microstructure are still unclear. Two phase transformation routes of HA decomposition during sintering were identified by transmission electron microscopy in this study. In the first route, HA is transformed to tetracalcium phosphate and needle-like β-tricalcium phosphate which is subsequently converted to α-tricalcium phosphate (α-TCP) above 1100 °C. In the second route, HA is transformed directly to α-TCP and calcium oxide at 1400 °C, accompanied by nanopore formation. In the second route, the α-TCP grew with a preferred orientation to form stripe-like grains. Further holding at 1400 °C for 4 h resulted in recrystallization; i.e., equi-axial grains formed within a stripe-like grain. Nanopore defects dispersed in the α-TCP grains are the main factor for the low density and decreased mechanical strength of the sintered bulk.

Original languageEnglish
Pages (from-to)3809-3816
Number of pages8
JournalCeramics International
Volume39
Issue number4
DOIs
Publication statusPublished - May 2013

Fingerprint

Durapatite
Hydroxyapatite
Phase transitions
Decomposition
Phosphates
Nanopores
Lime
Needles
Strength of materials
Sintering
Transmission electron microscopy
Defects
Microstructure
tricalcium phosphate

Keywords

  • B. Electron microscopy
  • C. Diffusion
  • D. Apatite
  • E. Biomedical applications

ASJC Scopus subject areas

  • Ceramics and Composites
  • Process Chemistry and Technology
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Phase transformation on hydroxyapatite decomposition. / Ou, Shih Fu; Chiou, Shi Yung; Ou, Keng Liang.

In: Ceramics International, Vol. 39, No. 4, 05.2013, p. 3809-3816.

Research output: Contribution to journalArticle

Ou, Shih Fu ; Chiou, Shi Yung ; Ou, Keng Liang. / Phase transformation on hydroxyapatite decomposition. In: Ceramics International. 2013 ; Vol. 39, No. 4. pp. 3809-3816.
@article{e92eb72b937f467490d7fbcd86e8cee4,
title = "Phase transformation on hydroxyapatite decomposition",
abstract = "The collapse of sintered hydroxyapatite (HA) has been attributed to HA decomposition; however, the detailed variations in microstructure are still unclear. Two phase transformation routes of HA decomposition during sintering were identified by transmission electron microscopy in this study. In the first route, HA is transformed to tetracalcium phosphate and needle-like β-tricalcium phosphate which is subsequently converted to α-tricalcium phosphate (α-TCP) above 1100 °C. In the second route, HA is transformed directly to α-TCP and calcium oxide at 1400 °C, accompanied by nanopore formation. In the second route, the α-TCP grew with a preferred orientation to form stripe-like grains. Further holding at 1400 °C for 4 h resulted in recrystallization; i.e., equi-axial grains formed within a stripe-like grain. Nanopore defects dispersed in the α-TCP grains are the main factor for the low density and decreased mechanical strength of the sintered bulk.",
keywords = "B. Electron microscopy, C. Diffusion, D. Apatite, E. Biomedical applications",
author = "Ou, {Shih Fu} and Chiou, {Shi Yung} and Ou, {Keng Liang}",
year = "2013",
month = "5",
doi = "10.1016/j.ceramint.2012.10.221",
language = "English",
volume = "39",
pages = "3809--3816",
journal = "Ceramics International",
issn = "0272-8842",
publisher = "Elsevier Limited",
number = "4",

}

TY - JOUR

T1 - Phase transformation on hydroxyapatite decomposition

AU - Ou, Shih Fu

AU - Chiou, Shi Yung

AU - Ou, Keng Liang

PY - 2013/5

Y1 - 2013/5

N2 - The collapse of sintered hydroxyapatite (HA) has been attributed to HA decomposition; however, the detailed variations in microstructure are still unclear. Two phase transformation routes of HA decomposition during sintering were identified by transmission electron microscopy in this study. In the first route, HA is transformed to tetracalcium phosphate and needle-like β-tricalcium phosphate which is subsequently converted to α-tricalcium phosphate (α-TCP) above 1100 °C. In the second route, HA is transformed directly to α-TCP and calcium oxide at 1400 °C, accompanied by nanopore formation. In the second route, the α-TCP grew with a preferred orientation to form stripe-like grains. Further holding at 1400 °C for 4 h resulted in recrystallization; i.e., equi-axial grains formed within a stripe-like grain. Nanopore defects dispersed in the α-TCP grains are the main factor for the low density and decreased mechanical strength of the sintered bulk.

AB - The collapse of sintered hydroxyapatite (HA) has been attributed to HA decomposition; however, the detailed variations in microstructure are still unclear. Two phase transformation routes of HA decomposition during sintering were identified by transmission electron microscopy in this study. In the first route, HA is transformed to tetracalcium phosphate and needle-like β-tricalcium phosphate which is subsequently converted to α-tricalcium phosphate (α-TCP) above 1100 °C. In the second route, HA is transformed directly to α-TCP and calcium oxide at 1400 °C, accompanied by nanopore formation. In the second route, the α-TCP grew with a preferred orientation to form stripe-like grains. Further holding at 1400 °C for 4 h resulted in recrystallization; i.e., equi-axial grains formed within a stripe-like grain. Nanopore defects dispersed in the α-TCP grains are the main factor for the low density and decreased mechanical strength of the sintered bulk.

KW - B. Electron microscopy

KW - C. Diffusion

KW - D. Apatite

KW - E. Biomedical applications

UR - http://www.scopus.com/inward/record.url?scp=84874654354&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84874654354&partnerID=8YFLogxK

U2 - 10.1016/j.ceramint.2012.10.221

DO - 10.1016/j.ceramint.2012.10.221

M3 - Article

AN - SCOPUS:84874654354

VL - 39

SP - 3809

EP - 3816

JO - Ceramics International

JF - Ceramics International

SN - 0272-8842

IS - 4

ER -