Dependence of the fracture toughness on the sintering time of dense hydroxyapatite bioceramics

Tolouei, Ranna and Singh, Ramesh and Sopyan, Iis and Yong, Tan Chou and Amiriyan, Mahdi and Dung, Teng Wan (2011) Dependence of the fracture toughness on the sintering time of dense hydroxyapatite bioceramics. Materials Science Forum, 694. pp. 391-395. ISSN 0255-5476

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Abstract

Fracture toughness dependence of sintered hydroxyapatite (HA) bioceramics on the sintering time was studied. The nanocrystalline and highly pure Hydroxyapatite powders produced by wet chemical precipitation method were used as starting material. After uniaxial and cold isostatic pressing, the green HA samples sintered at temperatures ranging from 1000 °C to 1300 °C with different sintering time. Dense compacts with grain sizes in the nanometer to micrometer range were processed. The average grain size of HA compact sintered at 1000 °C was around 500 nm. Grain size increased to 3 μm when the compacts were sintered at higher temperature. The average microhardness value of sintered HA decreased with an increased in grain size. Indentation fracture toughness for HA compacts of 700 nm grain size was 1.41±0.4 MPa.m1/2 which is similar to fracture toughness of human cortical bone.

Item Type:	Article (Journal)
Additional Information:	4809/4606
Uncontrolled Keywords:	Keywords Bioceramics, Fracture Toughness, Hydroxyapatite (HA), Sintering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA401 Materials of engineering and construction
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	PROF. DR. IIS SOPYAN
Date Deposited:	22 Nov 2011 17:28
Last Modified:	27 Jun 2013 10:51
URI:	http://irep.iium.edu.my/id/eprint/4606

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