Effect of the Concentrations of the Starting Solution on the Syntheses and Powder Properties of Hollow Tricalcium-Phosphate Microspheres by Ultrasonic Spray-Pyrolysis Technique
We synthesized tricalcium phosphate (TCP) microspheres using an ultrasonic spray-pyrolysis technique, and investigated the effect of the concentrations of the starting solution on the powder properties. The XRD pattern showed that the crystalline phases of the resulting powders were β-TCP/HAp biphase in the case of pyrolysis temperature at 850 °C and TCP single phase at 1000 °C. The Ca/P molar ratios were determined by XRF to be at 1.50±0.03. The particle shapes of the powders were observed by SEM; the diameters of the microspheres were narrowly distributed from 0.5 to 4 µm. The mean particle diameters of the resulting powder increased with the concentration of the starting solutions and could be controlled in the range of 0.85-1.4 µm. When the compressed powder was sintered at 1050 °C for 5 h , the relative density of the sintered compact attained to 97%. The TCP microspheres had good sinterability.
Takashi Nakamura, Kimihiro Yamashita and Masashi Neo
T. Ohno and M. Aizawa, "Effect of the Concentrations of the Starting Solution on the Syntheses and Powder Properties of Hollow Tricalcium-Phosphate Microspheres by Ultrasonic Spray-Pyrolysis Technique ", Key Engineering Materials, Vols. 309-311, pp. 235-238, 2006