ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Hydroxyapatite (HA) powder was synthesized by a sol-gel method with Ca(OH)2 andH3PO4 as reactants. The HA granules were then coated with TiH2 powder using a mechanicalmixing method. The HA-TiH2 material system produced HA-Ti composites after hot-pressing at1050ºC. The HA-Ti composites are mainly composed of HA and Ti, with small amounts of Ca2P2O7and Ca3(PO4)2 phases. Fracture toughness and bending strength are 2.4 MPa·m1/2 and 54.3 MPa,respectively for the HA-20vol%Ti composite, higher than those of the pure HA ceramic. Theimprovement in properties is because of the unique 3D network structure of Ti, which is an idealreinforcement structure for the weak and brittle HA. According to ISO/TR 7405-1984, hemolysistest was performed to evaluate the blood compatibility of the material. The results show that thehemolysis rate of the HA-20vol%Ti composite is 0.56%. Relative growth rates (RGR) of L-929cells soaked after 6 days in the HA-20vol%Ti group, pure Ti group, black group and pure Pb groupwere 132%, 100%, 90% and 6% respectively, while the level of cytotoxicity was grade 0 in HA-Ticomposite group. These results imply that the HA-20vol%Ti composite has good biocompatibilityand bioactivity
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.41-42.41.pdf
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