Work

Study of neck formation and densification in porous hydroxyapatite ceramics using thermal conductivity measurements

Year: 2023

Type: article

Abstract: Neck formation and densification during sintering have strong effects on the thermal conductivity of a porous ceramic body. This has been described by an analytical model using grain conductivity, grain size, pore fraction and particle – particle contact area as input parameters. It has been tested on hydroxyapatite ceramics sintered with conventional, microwave and spark plasma techniques. The green bodies containing at least 40% porosity yield conductivity values in the range 0.24–0.29 Wm−1K−1. Neck formation in the initial stage of sintering increases the values to above 0.5 Wm−1K−1. Further increase is achieved by densification, well described by Landauer's relation as part of the model with close agreement to experiment for hydroxyapatite ceramics containing 40 to 5% porosity. An evaluation of thermal conductivity for 100% dense hydroxyapatite gives a value of 1.5 Wm−1K−1 which is almost constant between room temperature and 900 °C.

Source: Open Ceramics

DOI: 10.1016/j.oceram.2023.100329

Authors: David S. Smith, Pierre Lefeuvre, Maxence Renaux, Benoit Nait-Ali, Anne Leriche

Institutions: Centre National de la Recherche Scientifique, Institut de Recherche sur les Céramiques, Université de Limoges, INSA Hauts-de-France, Université Polytechnique Hauts-de-France

Language: English

Topic: Bone Tissue Engineering Materials

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,000

Funders: Vlaamse regering, Interreg