About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Manufacturing and Processing of Advanced Ceramic Materials
|
Presentation Title |
Characterization of Early Stage Sintering in Hydroxyapatite via Thermal Conductivity Measurements |
Author(s) |
Anne Leriche, Benoit Nait-Ali, David Smith |
On-Site Speaker (Planned) |
Anne Leriche |
Abstract Scope |
In the last ten years, ceramic densification techniques have been developed, such as spark plasma sintering or microwave assisted heating, to limit grain growth and promote porosity elimination at lower temperatures. If the benefit of using these techniques on the final microstructure has been well established, their impact on the early stages of sintering has not yet been elucidated. The aim of the present work is to follow neck formation and densification in hydroxyapatite ceramics via thermal conductivity evaluation. An analytical model is proposed to describe the thermal conductivity of the green body / partially sintered ceramic in terms of interparticle contact area, porosity, grain size and the intrinsic grain conductivity. Samples were made using conventional sintering, microwave sintering and spark plasma sintering and characterized by laser flash measurements. Finally, the thermal conductivity evolution of a hydroxyapatite green body during the firing cycle is proposed. |