Microstructural dependence of Young's and shear moduli of P2O5 glass reinforced hydroxyapatite for biomedical applications

• Type: Article in International Scientific Journal
• Date: 2000

Authors

Maria Ascensão Lopes (Author) FEUP; Rui F. Silva (Author) Other; Fernando J. Monteiro (Author) FEUP; José D. Santos (Author) FEUP

Journal

Title: Biomaterials

Vol. 21 No. 7

Pages: 749-754

ISSN: 0142-9612

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 47 Citations

ISI Web of Science

Scopus - 55 Citations

COMPENDEX

Scientific classification

FOS: Engineering and technology > Environmental biotechnology

Other information

Authenticus ID: P-001-0CG

DOI: 10.1016/s0142-9612(99)00248-3

Abstract (EN): P2O5 glass reinforced hydroxyapatite composite materials were prepared through a liquid-phase sintering process. Secondary phases, beta- and alpha-tricalcium phosphates (beta-TCP and alpha-TCP), were formed in the microstructure of the composites, due to the reaction between the liquid glassy phase and the hydroxyapatite matrix. The dynamic Young's modulus (E) and shear modulus (G) of these composites were determined using an impulse excitation method. By applying the Duckworth-Knudsen equation, the elastic property results were correlated with the relative proportion of beta-TCP and alpha-TCP phases and with the porosity percentage present in the microstructure. Glass reinforced hydroxyapatite composites showed lower Young's and shear moduli than unmodified hydroxyapatite, mainly due to the presence of beta-TCP phase. The Duckworth-Knudsen model demonstrated an exponential dependence of E and G modulus with porosity and mathematical equations were derived for composite materials with porosity correction factors (b) of 4.04 and 4.11, respectively, indicating that porosity largely decreased both E and G moduli.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6