SPS工艺对GNFs/Al复合材料界面特征及力学性能的影响

Effect of SPS Process on Interface Characteristic and Mechanical Properties of Graphene Nanoflakes Reinforced Aluminum Matrix Composites

摘要:

利用放电等离子烧结(SPS)技术在不同温度及保温时间条件下制备了石墨烯/铝基复合材料,并对其微观组织及拉伸力学性能进行分析。结果表明,通过改变SPS工艺可调控石墨烯/铝的界面特征,进而影响复合材料的力学性能。500℃烧结时,石墨烯/铝界面反应虽被抑制,但界面结合力较弱,复合材料强度低；烧结温度提高到560℃时,界面结合力明显增强,且通过短时快速烧结可有效控制界面反应的发生,使复合材料力学性能明显提高。此外,石墨烯纳米片还可抑制铝基体晶粒随烧结温度升高而长大。

Abstract:

Graphene nanosheets (GNFs) reinforced aluminum composites were fabricated by spark plasma sintering (SPS) with different temperature and holding time. The microstructure and tensile properties of the composites were prepared and analyzed. Results show that the SPS process affects the mechanical properties of the composites by regulating the characteristic of GNFs/Al interface. When sintering at 500℃, the interfacial reaction of GNFs/Al is inhibited, but the interface bonding of graphene/aluminum is weak, which result in the low mechanical properties of the composite. When sintering temperature is increased to 560℃, the mechanical properties of composite significantly improved, which result from the GNFs/Al interface bonding force is obviously enhanced and the interface reactions is effectively control by rapid sintering. In addition, GNFs can also inhibit the coarsen of aluminum matrix grain with the sintering temperature increases.