常压下用湿化学沉淀法经过超声处理制备羟基磷灰石 (hydroxyapatite,HA)纳米针状晶。实验中以Ca(NO3) 2 ·4H2 O和 (NH4) 2 ·HPO4为原料 ,去离子水为溶剂 ,氨水为pH调节剂。通过TEM ,XRD和IR分析 ,研究了不同工艺条件下超声处理对HA晶体形态和尺寸的影响。试验表明 :超声处理可引起HA晶体的形状和尺寸的变化 ,针状晶沿长径方向都有所增长 ,晶簇更加明显。与高温下烧结的HA相比 ,这些晶体表现出一种弱结晶的磷灰石结构 Under normal pressure, wet-chemical precipitation was used to prepare hydroxyapatite (HA) nanometer acicular crystals. In the experiment, Ca (NO3) 2 · 4H2O and (NH4) 2 · HPO4 were used as raw materials, deionized water as solvent and ammonia as pH regulator. The effect of ultrasonic treatment on the morphology and size of HA crystal was studied by TEM, XRD and IR. Experiments show that: ultrasonic treatment can cause changes in the shape and size of HA crystals, acicular crystals along the long axis direction of the growth, the more obvious cluster. These crystals exhibit a weakly crystalline apatite structure compared to HA sintered at high temperatures