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The influence of the foaming agent on the mechanical properties of the PM hydroxyapatite-based biocomposites processed by two-step sintering route

O. GINGU1,* , D. COJOCARU2, C. RISTOSCU3, G. SIMA1, C. TEISANU1, M. MANGRA1

Affiliation

  1. University of Craiova, Faculty of Mechanics, 107 Calea Bucuresti, 2200512, Craiova, Romani
  2. University Politehnica of Bucharest, 313 Splaiul Independentei, 060042, Bucharest, Romania
  3. Laser Department, National Institute for Laser, Plasma and Radiation Physics, PO Box MG-36, RO-77125, Magurele, Ilfov, Romania

Abstract

As bone tissue engineering applications, the studied biocomposites are processed by the powder metallurgy (PM) route. The powder mixture is made of hydroxyapatite submicronic powders (< 200 nm) respectively micronic (30-50 m) as matrix and TiH2 (100-150 m; 15-20 % mass.) as reinforcement’s precursor as well as blowing agent. To increase the porosity by the space holder technique, CaCO3 powder is added (5-10 % mass.). The homogenization step is performed in Pulverisette 6 ball mill (n = 200 rpm, time = 30 min.) followed by the cold compaction at 150 MPa. The green compacts are submitted to the two-steps sintering (TSS) route. Both foaming reactions developed in a manner specific to this composite system: the hydride dehydrogenation lead to TiO2 (rutile) synthesis respectively the CaO was not synthesized along the CaCO3 decomposition, and Ca3(PO4)2 was formed . The compression tests of the researched biocomposites proved widened spectrum of mechanical behavior, from fragile to ductile, depending on the foaming agents content and decomposition reactions along the TSS technology..

Keywords

Biocomposites, Two-steps sintering, Foaming, Mechanical properties.

Submitted at: April 9, 2015
Accepted at: June 24, 2015

Citation

O. GINGU, D. COJOCARU, C. RISTOSCU, G. SIMA, C. TEISANU, M. MANGRA, The influence of the foaming agent on the mechanical properties of the PM hydroxyapatite-based biocomposites processed by two-step sintering route, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 7-8, pp. 1044-1049 (2015)