利用冲击波技术对羟基磷灰石团聚体的活化改性

Activation of Hydroxyapatite Agglomerate by Shock Wave

对水溶液沉淀法所得的羟基磷灰石(HA)粉末团聚体经冲击波作用后的活性进行了研究,以便获得力学性能更好的HA陶瓷。通过XRD及SEM分析,冲击波对HA团聚体粉末具有明显的均化与细化作用,并产生了一定程度的晶格畸变。与未经冲击波处理的HA粉末比较,其XRD数据更接近动物骨的数据。通过衍射峰展宽现象分析,得到粉体内的平均晶格畸变量约为4.87×10-3,由此而存在晶格中的额外缺陷能在烧结过程中释放,可促进HA陶瓷的烧结,使冲击试样比未冲击试样达到最大线收缩率时的温度降低70℃,HA陶瓷的强度和密度明显提高。

Activating and sintering characteristics of hydroxyapatite (HA) agglomerate treated by shock wave were studied for obtaining better mechanical performance HA ceramics. The grain size refinement, homogenization and dislocation of lattice in shocked HA powders were analyzed by XRD and SEM. The results show that the XRD data of shocked HA powder are more similar to the data of bone crystals than unshocked HA powder's. Estimated value of the strain is 4 87 × 10-3. The energy stored in shocked powders was released during sintering process. The temperature of maximum shrink rate of shocked sample was about 70°C lower than that of unshocked one. The strength and density of HA ceramics from the shocked sample can be enhanced obviously.