中文摘要：

方向二维择优生长,针状水化产物沿c轴择优取向生长。X射线衍射和Fourier红外光谱测试结果表明：初始pH值大于5时,水化产物为缺钙型羟基磷灰石,含有少量CO32-和HPO42-,且HPO42-含量随初始pH值的升高而降低。

英文摘要：

The laws governing changes of hydration products of α-tricalcium phosphate（α-TCP） after hydration reaction at 70 ℃,atmospheric pressure for 24 h with various initial pH values and the growth mechanisms of different morphology of hydration products were studied.A strong effect of initial pH value on morphology of hydration products was confirmed by scanning electron microscopy.The products obtained at pH values of 4.0,5.0,9.3,11.4,and 12.4 were block-shaped dicalcium phosphate with a smooth surface,single crystals with an elongated plate-like shape and a needle-like and elongated plate-like shape,both needle-like single crystals,respectively,which were identified by X-ray diffraction（XRD）.Calculated from diffraction patterns by transmission electron microscopy,the needle-like single crystals grow along c-axis,while the plate-like single crystals are elongated by length along c-axis and by width in the 110 direction.Results from XRD and Fourier transform infrared spectroscopy show that the hydration products obtained at different initial pH values（pH5） are all calcium-deficient hydroxyapatite containing small amounts of CO32– and HPO42– which decrease with the increase of initial pH values.