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借助直流脉冲微弧氧化(MAO)电源,采用恒压模式在AZ80镁合金表面制备四种不同厚度MgO陶瓷层,并以此为基,采用离子束复合磁控溅射技术沉积类金刚石碳(DLC)膜,对比研究了四种膜层体系(MAO-1min/DLC、MAO-3min/DLC、MAO-5min/DLC及MAO-10min/DLC)的表面结构特征、力学性能以及摩擦学性能差异。结果表明:随MAO层厚度增加,复合膜层表面微孔的孔径增大,表面粗糙度增加,且表层DLC膜具有颗粒特征,表现为MAO-3min/DLC及MAO-10min/DLC复合膜层具有较高的纳米硬度和弹性模量,且在磨损过程中对应的摩擦系数与磨痕宽度较小,其抗磨损性能优异;各复合膜层体系在磨损过程中摩擦系数均有波动,产生高温氧化,磨痕表面形成了Fe的转移层;MAO层可提高基体对DLC膜的支撑强度,表层DLC膜对磨损界面具有的润滑作用是复合膜层改善镁基体抗磨损性能之原因所在。
Four different thicknesses of MgO ceramic layers were prepared on the surface of AZ80 magnesium alloy by DC pulse micro-arc oxidation (MAO) power supply. Based on this, the ion-beam composite magnetron sputtering technique was used to deposit diamond-like carbon ), The surface structure, mechanical properties and tribological properties of the four film systems (MAO-1min / DLC, MAO-3min / DLC, MAO-5min / DLC and MAO-10min / DLC) were compared. The results show that with the increase of the thickness of the MAO layer, the pore diameter of the micropores on the surface of the composite film increases, the surface roughness increases, and the surface DLC film has the characteristics of particles. The MAO-3min / DLC and MAO-10min / Higher nano-hardness and elastic modulus, and the corresponding friction coefficient and wear scar width are smaller during wear, and the wear resistance is excellent. The friction coefficient of each composite film system fluctuates during the wear process, resulting in high temperature oxidation , Wear scar surface formed Fe transfer layer; MAO layer can improve the substrate support strength of the DLC film, the surface of the DLC film on the wear interface lubrication is composite film layer to improve the wear resistance of magnesium matrix.