纳米羟基磷灰石复合陶瓷生物摩擦学行为研究

Study on the Biotribological Behaviors of Nanosized Hydroxyapatite Composite Ceramics

采用沉淀法合成了纳米羟基磷灰石(HA)粉体,无压烧结工艺制备了HA/PSZ陶瓷复合材料.利用材料试验分析系统(MTS)和纳米硬度分析测试系统(T riboindenter)测定了复合材料的宏观和微观力学性能,用销盘式摩擦磨损试验机考察了血浆润滑条件下复合材料的生物摩擦学性能,探讨了力学性能与摩擦学性能之间的关系.结果表明,无压烧结HA/PSZ复合陶瓷材料断裂韧性比纯HA陶瓷提高近2.7倍,弯曲强度提高近1倍.纳米硬度最高值为10.6 GPa,纳米弹性模量为156.0 GPa.血浆润滑条件下,HA/PSZ陶瓷和UHMW PE摩擦副的摩擦系数与HA的含量有关,UHMW PE的磨损率与HA/PSZ复合陶瓷摩擦副的硬度和断裂韧性存在反比关系.

Nanosized hydroxyapatite （HA） particles were synthesized by precipitation process. Pressureless sintering （PS） method was used for preparing HA/partially stabilized zireonia （PSZ） ceramic composites. The macro and micro mechanical properties of all HA/PSZ ceramics were obtained by material test systemc （MTS） and nanoindentation tests. A pin slid-on-disc tribometer was used to observe the tribological behaviors of these composites in human plasma lubrication. The results show that the fracture toughness and betiding strength of these HA/PSZ ceramics were higher than those of the pure HA ceramic by 2.7 and 1.0 times, respectively. The highest nanohardness and elastic modulus were up to 10. 6 GPa and 156.0 GPa, respectively. Under human plasma lubrication, the friction coefficients of HA/PSZ sliding against UHMWPE were related to the content of HA in ceramics. The wear rates of UHMWPE were in inverse proportion to the fracture toughness and nano-hardness of HA/PSZ ceramics.