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Development of Dense Hydroxyapatite Nanoceramic by Pressureless Sintering

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Abstract:

In order to improve fracture toughness, nanocrystalline hydroxyapatite (HA) powder was used for fabricate dense HA nanoceramic. The nanocrystalline HA powder was obtained with ball milling for 12 h from calcined natural bovine bone. The green compacts of HA nanopowder were sintered by pressureless sintering with non-linear heating rate sintering at 1200°C for 3 h. Fracture toughness and hardness properties of HA nanoceramic have been assessed using indentation technique. The fracture toughness values of sintered nanosized-HA powder is 3.50.1 MPa.m1/2, which is within those of human cortical bone. The nanostructure with liquid phase sintering of sintered nanosized-HA powder contributed to the increase of fracture toughness. The toughening mechanisms of pull-out of nanocrystalline HA and grain boundary sliding have been observed.

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Periodical:

Advanced Materials Research (Volumes 622-623)

Pages:

910-914

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.622-623.910

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Online since:

December 2012

Authors:

Sittiporn Punyanitya, Anirut Raksudjarit

Keywords:

Mechanical Property, Nanomaterial, Nanoparticle, Nanosintering

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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