Abstract

VALIN-FERNANDEZ, Meylí et al. Mechanical characterization ofnanoporous hydroxyapatite disks obtained by sintering. Ingeniería Mecánica [online]. 2017, vol.20, n.3, pp. 144-151. ISSN 1815-5944.

The objective of this work is the mechanical characterization of disks made from Cuban synthetic hydroxyapatite (HA) and Strem Chemicals - USA powders. With different particle sizes and semi-spherical shape with porous surfaces. Without pore-forming additives, by uniaxial compaction and sintering in electric furnace at different sintering regimes. Obtaining ranges of apparent porosities between 3 and 40%, with pore sizes between 18 and 100 nm and their dimensions smaller than 20 mm in diameter and 2 mm thick. The hardness, fracture toughness and diametrical compression of the discs were evaluated. To determine the hardness, the Vickers microhardness test and fracture toughness were used for the radial cracking and palmqvist analysis method produced by Vickers prints. Samples with larger particle size powders presented behavior in the values ​​of hardness and toughness to nonlinear fracture with porosity. In general, the samples with lower mean powder size presented higher results.

Keywords : hydroxyapatite; sintering; porosity.

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