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We performed to synthesize the calcium-phosphate microsphere with well-controlled particle size by changing the frequency of the ultrasonic transducer. The crystalline phases of the resulting powders were composed of β -tricalcium phosphate (ƒÀ-TCP) and hydroxyapatite (HAp); the Ca/P mola r ratios were about 1.50. The SEM observation indicated that the resulting powders were composed of microspheres with a diameter of •`1 to •`2.5 gm . The particle sizes increased with decreasing ultrasonic frequency , and the distributions were quite narrow. The above results show that the particle size can be easily controlled by changing the frequency of ultrasonic transducer during spray-pyrolysis.

SYNTHESIS OF CALCIUM-PHOSPHATE MICROSPHERE WITH WELL-CONTROLLED PARTICLE SIZE BY ULTRASONIC SPRAY-PYROLYSIS TECHNIQUE AND THEIR SINTERABILITY