HA/UHMWPE复合材料的微观组织及力学性能

Microstructure and mechanical properties of HA/UHMWPE composites

采用机械球磨法对羟基磷灰石(HA)/超高分子量聚乙烯(UHMWPE)粉末进行混合处理,通过热压将混合粉末制成复合材料。通过X射线衍射、SEM观察及力学性能测试对混合粉末及复合材料进行微观组织和力学性能的分析。结果表明:球磨使HA颗粒得到了细化,而UHMWPE有粗化的趋势,同时HA/UHMWPE混合粉末组织更加均匀。球磨后HA没有发生分解,也没有新的物质产生。复合材料断面形貌呈网状结构,球磨时间越长,这种网状组织越均匀。随着球磨时间的增加,HA/UHMWPE复合材料的拉伸强度、冲击强度呈上升趋势。经球磨时间40 h后的复合材料具有较好的综合力学性能,同时又具有较理想的微观组织。

HA/UHMWPE powders were mixed by ball milling,then were hot pressed into composites.The microstructure of the mixed powder,and composites were characterized by XRD,SEM,and mechanical properties of the composites were examined by mechanical test.The results show that the HA particles are refined after ball milling,while the UHMWPE tend to be coarser,and the mixed powders become more homogeneously.After ball milling,no new products are observed and the HA is not decomposed.The fracture of the composite exhibits network morphology,and the network texture is more even for the composites prepared using the powders milled for longer time.Tensile strength and the impact toughness of the composites increase with the increasing ball milling time of the powders which are used to fabricate the composites.