Microwave sintering of fine grained HAP and HAP/TCP bioceramics
AuthorsVeljović, Đorđe N.
Smičiklas, Ivana D.
Janaćković, Đorđe T.
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The effect of microwave sintering conditions on the microstructure, phase composition and mechanical properties of materials based on hydroxyapatite (HAP) and tricalcium phosphate (TCP) was investigated. Fine grained monophase HAP and biphasic HAP/TCP biomaterials were processed starting from stoichiometric and calcium deficient nanosized HAP powders. The HAP samples microwave (MAT) sintered for 15 min at 900 degrees C, with average grain size of 130 nm, showed better densification, higher density and certainly higher hardness and fracture toughness than samples conventionally sintered for 2 h at the same temperature. By comparing MW sintered HAP and HAP/TCP samples, it was concluded that pure HAP ceramics have superior mechanical properties. For monophase MW sintered HAP samples, the decrease in the grain size from 1.59 mu m to 130 nm led to an increase in the fracture toughness from 0.85 MPa m(1/2) to 1.3 MPa m(1/2). (C) 2009 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Keywords:Grain size / Hardness / Apatite / Microwave sintering / Toughness
Source:Ceramics International, 2010, 36, 2, 595-603
- Ministry of Science and Technological Development of the Republic of Serbia [142070B, EUREKA E! 3033], Ministry of Education and Science of the Republic of Latvia [EUREKA E! 3033]