Effects of annealing in air on microstructure and hardness of hydroxyapatite ceramics. (25th May 2021)

• Record Type: Journal Article
• Authors: Zhu, Wenliang; Imamura, Hayata; Marin, Elia; Adachi, Tetsuya; Miyamoto, Nao; Yamamoto, Toshiro; Kanamura, Narisato; Pezzotti, Giuseppe
• Is Part Of: Journal of physics. Volume 54:Number 31(2021)
• Publication Date: 2021-05-25
• Subjects: hydroxyapatite -- ceramics -- annealing -- microstructure -- Raman spectroscopy; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/abfe82
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: In this study, microstructural variation of hydroxyapatite (HAp) ceramics upon thermal treatment in air at different temperatures was investigated by x-ray diffraction patterns, Raman and x-ray photoelectron spectroscopies. The results revealed a significant dependence of the microstructure of nonstoichiometric HAp on temperature, because of the competition between hydroxylation and different kinds of dehydroxylation at different temperatures, and a gradual increase in material hardness with annealing temperature because of structural reconstruction. In summary, a suitable thermal treatment can effectively tailor microstructure and defect contents, as well as chemical composition and mechanical hardness of HAp ceramics.