硅酸钙—羟基磷灰石复合生物陶瓷的制备及其理化性能研究

以自制硅酸钙（CaSiO3）和羟基磷灰石（HAP）超细粉体为原料，按照不同的比例混合、成型、煅烧制得CaSiO3-HAP复合生物陶瓷。采用X-射线衍射仪（XRD）和扫描电镜（SEM）对粉体及陶瓷样品进行物相成分和显微结构分析，并对复合生物陶瓷的收缩率、抗弯强度、断裂韧性和硬度等性能进行测定。研究结果表明：在HAP中添加一定量的CaSiO3，可以减小HAP陶瓷的收缩，并能提高其力学性能，CaSiO3含量为30wt％的CaSiO3-HAP复合生物陶瓷综合性能最佳，其抗弯强度和断裂韧性分别达到156．7MPa和2．32MPa·m^1/2，维氏硬度值达到6．5GPa，比纯HAP陶瓷的性能均有了较大的提高。

Preparation and Physical --chemical Properties of Calcium Silicate-Hydroxyapatite Composite Bioceramics

Calcium silicate and hydroxyapatite powders were prepared independently. Then the two powders were mixed, formed, calcined to prepare the CaSiO3-HAP composite bioceramics according to the different allocated proportion. The phase composition and microstructure of powders and composite ceramics were analyzed by XRD and SEM. Many properties of the composite ceramics such as contraction rate, flexural strength, fracture toughness and hardness were determined. The experimental results showed that the contraction of ceramics was reduced and mechanical properties were improved when CaSiO3 was added to HAP ceramics. The integrated performance of CaSiO3-HAP composite bioceramies was the beet when the content of CaSiO3 was 30wt%. The flexural strength and fracture toughness were independently 156.7MPa and 2.32MPa · ml/2 ,and the hardness was 6.5GPa,which were better than the properties of pure HAP ceramics.