Some Properties of Carbonate-Containing Hydroxyapatite Powder Prepared by Spray-Pyrolysis Technique Using Urea as a Foaming Agent

1995 Journal of the Ceramic Society of Japan  
The effect of urea addition on the formation of hydroxy apatite (HAp) through the spray-pyrolysis technique was examined. The crystalline phases of the powders prepared from the spraying solution without urea were HAp and a small amount of 1-tricalcium phosphate; however, only carbonate-containing HAp was formed from the solutions with urea concentrations of 1.00 mol• dm-3 or higher. The SEM observations showed that the particle size of the as-prepared powder decreased with increasing urea
more » ... ncreasing urea concentration in the spraying solution. This reduction of the particle size may be due to the foaming action of C02 generated by the decomposition of urea. The relative density of the sintered body which originated from the solution with an urea concentration of 5.00mol• dm-3 was compara ble to that from the calcined and crushed powder which was obtained by spray-pyrolysing the solution without urea. The calcining and crushing operations before the fabrication of the sintered body may be omit ted when the powders are prepared from starting solu tions containing some urea.
doi:10.2109/jcersj.103.1214 fatcat:6fivpr3ktje43aflyiiaa75yhi