摘要
在电解液内加入适量石墨烯,对B19铝合金钻杆实施表面微弧氧化(MAO),分析了石墨烯引起的铝合金MAO层结构性能的变化,并对其耐磨性进行了测试。研究结果表明:添加石墨烯MAO层形成了强度更高的α-Al_(2)O_(3)相与γ-Al_(2)O_(3)相衍射峰。添加石墨烯MAO层形成了较平滑的表面,表面微孔明显减少。添加石墨烯前后MAO层依次升高至3.96与2.85μm,微弧反应期间形成的小尺寸熔体液滴和石墨烯、MAO膜共同发生熔合。经过MAO后的基底达到了更大硬度,加入石墨烯条件下制得MAO层相对于基底硬度增大近六倍,石墨烯能够显著提高铝合金硬度。当在电解液中加入石墨烯后,MAO层获得了更低摩擦系数,只有0.67,磨痕宽度达到645μm。添加石墨烯MAO层经过磨损后形成了更薄试样,高硬度的MAO层获得了比铝合金基底更优的耐磨性。
Surfaces of B19 Al-alloy, a drill-pipe material in petroleum industry, were modified by micro-arc oxidation(MAO) in graphene-added electrolyte.The influence of the graphene-content on the microstructures, phases and tribological properties was investigated with X-ray diffraction, scanning electron microscopy, Raman spectroscopy and conventional mechanical probes.The results show that the graphene addition had a major impact.For example, the graphene-addition resulted in many significant changes, including: i) formation of higher density of α-Al_(2)O_(3) and γ-Al_(2)O_(3) phased smaller grains in the smoother, more compact and thicker(3.96 μm) MAO-coatings with fewer micro pores;ii) a six-time stronger hardness and a lower wear-rate than that of Al-alloy;iii) a decrease of friction coefficient down to 0.67 and reduced surface roughness.Possible mechanisms responsible for the improvement of tribological properties were also tentatively discussed in a thought provoking way.
作者
吴琰杰
李晓
WU Yanjie;LI Xiao(Yellow River Institute of Communications,College of Traffic Engineering,Jiaozuo 454000,China;College of Resources and Environment,Henan University of Science and Technology,Jiaozuo 454000,China)
出处
《真空科学与技术学报》
CAS
CSCD
北大核心
2021年第3期248-252,共5页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金青年科学基金项目(61604023)
河南省重大科技专项(181200210300)。
