真空热压制备石墨烯增强钛基复合材料

Preparation of graphene-reinforced titanium matrix composites by vacuum hot pressing

采用葡萄糖和钛粉真空热压烧结原位合成了钛基体-石墨烯复合材料。复合材料界面结构稳定,界面处产生的石墨烯片层结构清晰,条纹间距约为0.32 nm,与石墨层片理论间距0.337 nm相近。特别值得一提的是:在1300℃烧结条件下,复合材料屈服强度和延伸率跟相同条件制备的纯钛样品相比都在增加。其原因可能是原位合成的石墨烯和纳米颗粒TiC在钛基体内协调变形,为缓和复合材料的强塑性矛盾提供很好的解决思路。

In this paper,titanium matrix-graphene composites were successfully in-situ synthesized using glucose as carbon source.Graphene-reinforced pure titanium matrix composites were prepared in situ by vacuum hot-pressing sintering method using glucose solution and pure titanium powder as raw materials.The interfacial structure of the composite prepared by in-situ synthesis is stable,the structure of graphene lamellae at the interface is clear,and the spacing of striations is about 0.32 nm,which is close to the theoretical spacing of graphite lamellae of 0.337 nm.It can be concluded that the component is multilayer graphene.At 1300℃,compared with pure titanium sintered under the same condition,the yield strength and elongation of the in situ synthesized composites increase,it provides a good way to solve the contradiction of strength and plasticity of composite materials.