Norakmal, A. and Ramesh, S. and Tan, C.Y. and Muchtar, A. and Yap, B.K. and Tolouei, R. (2014) Sintering studies of synthesised manganese-oxide-doped calcium phosphate via wet chemical precipitation method. Materials Research Innovations, 18 (S6). pp. 147-150.
Full text not available from this repository.Abstract
The beneficial effects of incorporating small amounts of manganese oxide, MnO2 (0.05, 0.1, 0.3, 0.5 and 1.0 wt%) into biphasic calcium phosphate in promoting sintering and its effect on physical and mechanical properties of the dense sample sintered at 1000-1400 degrees C were investigated. In this work, a wet precipitation method was employed to prepare biphasic calcium phosphate powder. The starting materials of calcium hydroxide and orthophosphoric acid were used in the titration process and the as-synthesised powder was subsequently doped with manganese oxide by wet milling. The X-ray diffraction analysis revealed that the phase present in the as-synthesised powder was predominantly hydroxyapatite. However, upon sintering, all the samples revealed the existence of biphasic calcium phosphate i. e. a mix phase comprising of hydroxyapatite and tricalcium phosphate. The highest relative density of 99.5% was obtained for biphasic calcium phosphate doped with 0.3 wt% MnO2 when sintered at 1400 degrees C. The results also revealed that 0.3 wt% MnO2-doped biphasic calcium phosphate gave a maximum Vickers hardness of 5.14 GPa. On the other hand, 1.0 wt% MnO2-doped biphasic calcium phosphate exhibited highest fracture toughness of 1.32 MPa m(1/2) as compared to 0.88 MPa m(1/2) for undoped biphasic calcium phosphate when sintered at 1200 degrees C.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | Biphasic calcium phosphate; Sintering additives; Manganese oxide; Sintering |
| Subjects: | Q Science > Q Science (General) |
| Depositing User: | Dr Mohd Faizal Hamzah |
| Date Deposited: | 30 Dec 2015 08:36 |
| Last Modified: | 30 Dec 2015 08:36 |
| URI: | http://eprints.um.edu.my/id/eprint/15462 |
Actions (login required)
 |
View Item |
