The structural characteristics and mechanical behaviors of nonstoichiometric apatite coatings sintered in air atmosphere
✍ Scribed by Han, Yong ;Xu, Kewei ;Lu, Jian ;Wu, Zhu
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 371 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0021-9304
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✦ Synopsis
Two types of nonstoichiometric apatite coatings on Ti6Al4V substrates were prepared in our laboratory by electrodeposition and hydrothermal synthesis. One was composed of highly pure needle-like calcium-deficient hydroxyapatite, and the other consisted of needle-like calciumdeficient hydroxyapatite and plate-like brushite. In this paper, the morphology, phase transition, and bonding strength of these coatings sintered at 450 °∼980°C in an air atmosphere were studied. In addition, the residual stresses in pure calcium-deficient hydroxyapatite coatings and coatings sintered at 800°C were measured by a hole-drilling method.
The results show that after being sintered at a higher temperature, the coating/Ti6Al4V samples exhibited structural characteristics such as biphasic [hydroxyapatite + -Ca 3 (PO 4 ) 2 ] coatings and dense TiO 2 film/Ti6Al4V in which the residual stresses in the coatings slightly increased. In addition, the results indicate that bonding strength was improved.