选取尿素(CA)、乙酰胺(AA)和丙酰胺(PA)为p H调节剂,采用水热法制备羟基磷灰石(HA)纤维,研究了不同保温时间条件下p H调节剂对产物物相和形貌的影响,确定了选用不同调节剂时优化的水热反应时间。结果表明,用CA作为p H调节剂,反应0.5 h即可得到结晶度较高的HA,延长反应时间,晶体结晶度和择优取向发生了变化;而用AA和PA作为p H调节剂时,反应1.0 h后还有部分磷酸八钙相(OCP)未完全转变为HA。用CA作为p H调节剂时,制备的产物由团聚体组成,微观形貌呈带状,表面光滑,柔韧性较好,且延长时间,纤维有变长细化的趋势;用AA和PA作为p H调节剂时,产物在0.5 h内呈弯曲甚至卷曲,1.0 h后纤维开始脆断,随时间的延长,断裂现象更加明显。选用AA和PA作为p H调节剂,反应时间不宜超过0.5 h。 Hydroxyapatite (HA) fibers were prepared by hydrothermal method using urea (CA), acetamide (AA) and propionamide (PA) as p H regulators. The effects of p H regulators on the product Phase and morphology of the influence, to determine the choice of different regulators optimized hydrothermal reaction time. The results showed that HA with higher degree of crystallinity could be obtained by reaction of 0.5 h with CA as p H modifier, and prolonged the reaction time, crystallinity and preferred orientation changed. When AA and PA were used as p H modifier, After 1.0 h of reaction, some octacalcium phosphate phase (OCP) did not completely transform into HA. When CA is used as the p H modifier, the product is composed of agglomerates, the microstructure is zonal, the surface is smooth, the flexibility is good, and prolonging the time, the fibers tend to elongate and refine. With AA and PA as the p H regulator, the product was bent or even curled within 0.5 h, and the fibers began to brittle after 1.0 h. The fracture phenomenon became more obvious with the increase of time. AA and PA were chosen as p H regulators, the reaction time should not exceed 0.5 h.