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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2000

Autores

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

Revista

Título: Biomaterials

Vol. 21 Nº 7

Páginas: 749-754

ISSN: 0142-9612

Editora: Elsevier

Indexação

ISI Web of Knowledge - 47 Citações

ISI Web of Science

Scopus - 55 Citações

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Biotecnologia ambiental

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6