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Article Dans Une Revue Open Ceramics Année : 2023

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

David Stanley Smith
  • Fonction : Auteur
  • PersonId : 866129
Benoît Nait-Ali
  • Fonction : Auteur
  • PersonId : 866128

Résumé

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.

Dates et versions

hal-04491939 , version 1 (06-03-2024)

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Citer

David Stanley Smith, Pierre Lefeuvre, Maxence Renaux, Benoît Nait-Ali, Anne Leriche. Study of neck formation and densification in porous hydroxyapatite ceramics using thermal conductivity measurements. Open Ceramics, 2023, 13, pp.100329. ⟨10.1016/j.oceram.2023.100329⟩. ⟨hal-04491939⟩
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