In-situ synchrotron X-ray diffraction of hydroxyapatite-zirconia composite during conventional and flash sintering

Author(s)

Lavagnini, Isabela R. ; Campos, Joao, V ; Jesus, Lilian M. ; Lobo, Anderson O. ; Ghose, Sanjit K. ; Raj, Rishi ; Pallone, Eliria M. J. A.

• Document type: Journal article
• Source: Journal of the European Ceramic Society; v. 44, n. 7, p. 10-pg., 2024-02-24.

Abstract

We conducted in-situ X-ray diffraction to study the crystalline phase evolution in hydroxyapatite-zirconia composites during both conventional and flash sintering processes. Additionally, we examined the thermal history and microstructure of the composite under these sintering conditions. Despite both sintering methods reaching similar average temperatures, they yielded distinct results in terms of crystalline phase composition and microstructure. In the flash sintered samples, we observed a complete transformation of hydroxyapatite into alpha tricalcium phosphate and a complete tetragonal to cubic phase transition in zirconia. Conversely, the conventionally sintered samples remained practically stable. Notably, the flash sintered samples exhibited needle-like microstructures, which were absent in their conventionally sintered counterparts. This divergence suggests that the application of an electric field plays a role in generating athermal effects during the sintering of hydroxyapatite-zirconia composites. (AU)

• FAPESP's process: 19/14677-9 - Influence of the Multi Step Flash Sintering technique on the microstructural control of ZrO2
• Grantee: Eliria Maria de Jesus Agnolon Pallone
• Support Opportunities: Regular Research Grants
• FAPESP's process: 21/06509-9 - Ionic conductor glass-ceramics sintering with concurrent crystallisation using flash sintering
• Grantee: João Vitor Campos
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 19/03786-1 - Instrumentation and automation of a tube furnace adapted to flash sintering
• Grantee: João Vitor Campos
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
• FAPESP's process: 22/10604-0 - Development of ceramics scaffolds for application in tissue engineering
• Grantee: Carlos Eduardo Ambrósio
• Support Opportunities: Research Projects - Thematic Grants