以Ca(NO3)2·4H2O和(NH3)2HPO4为原料,用沉淀法合成羟基磷灰石(HA)。在合成过程中添加明胶,考察明胶对HA成核、生长、粉末形态及热稳定性的影响。研究表明:当明胶加入量超过4wt％时,将阻碍HA的成核和生长;加4wt％明胶合成的粉末,经900℃煅烧,其平均颗粒尺寸为40nm,明显小于未加明胶的HA粉末,但热稳定性较差;在1000℃煅烧便有部分羟基磷灰石分解,生成β-磷酸钙。此β-磷酸钙煅烧至1500℃呈熔融态,仍没有相变为α-磷酸钙,具有很好的热稳定性。
The role of gelatin was examined with the main focus on its induction ability of hydroxyapatite (HA) nucleation in a modified aqueous solution with gelatin.
The results show that when the addition of gelatin is in the range of 1wt%～3wt%, HA crystal is formed with a perfect crystalline. However, no HA nucleation occurrs
when gelatin content reaches 4wt% because of the steric effect. When the dried powder with 4wt% gelatin addition calcined at 900℃, the average size
of HA is about 40nm which is smaller than those of synthesized particles without gelatin addition. However, this powder is easier to decompose to β-TCP when
sintered at 1000℃, and the resultant β-TCP possesses a significant thermal stability up to 1500℃.
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