N掺杂对V-Al-C涂层微观结构、力学及摩擦性能的影响

发布时间：2018-01-03 15:06

本文关键词：N掺杂对V-Al-C涂层微观结构、力学及摩擦性能的影响　出处：《金属学报》2017年06期 　论文类型：期刊论文

【摘要】：采用磁控溅射技术在Si片(100)和高速钢上制备V-Al-C和V-Al-C-N涂层,利用XRD、XPS、SEM、纳米压痕仪和摩擦磨损试验机对比分析了涂层的相结构、化学组成、表面形貌、断面结构、力学性能以及不同介质中(大气、去离子水和海水)涂层的摩擦学性能。结果表明,V-Al-C涂层呈柱状晶结构生长,晶粒粗大;N的引入阻碍V-Al-C涂层的柱状晶结构生长,结构致密化,晶粒尺寸减小,形成非晶碳包裹纳米晶的纳米复合结构,使硬度从(14±0.48)GPa增加到(24.5±0.8)GPa,韧性得到大幅提高(H/E0.1)。大气干摩擦条件下,V-Al-C涂层摩擦系数为0.70,引入N后摩擦系数降为0.42,这主要是由于在摩擦过程中V-Al-C-N涂层生成了具有润滑效果的V_2O_5,在非晶碳与V_2O_5耦合润滑作用下,涂层摩擦系数降低了40%;对于同一涂层,在去离子水和海水环境下的摩擦系数较大气干摩擦条件下降低,主要原因为:前者吸附的水分子可形成边界润滑作用。海水环境摩擦时,海水中Mg~(2+)、Ca~(2+)生成Mg(OH)_2、CaCO_3,均可提供进一步润滑效果,摩擦系数最低。3种环境摩擦过程中,30 min后V-Al-C涂层均因严重的磨粒磨损致磨穿而失效,且在腐蚀和磨损的协同作用下,海水环境中的磨损率最高。使用N掺杂制备的V-Al-C-N涂层均显示出良好的抗磨损性能,在干摩擦时磨损率为3.0×10~(-16)m~3/(N·m),在海水中为1.4×10~(-15)m~3/(N·m)。
[Abstract]:V-Al-C and V-Al-C-N coatings were prepared on Si wafer 100) and high speed steel by magnetron sputtering technique. The phase structure, chemical composition, surface morphology, cross section structure, mechanical properties and medium (atmosphere) of the coatings were compared and analyzed by nano-indentation tester and friction and wear tester. Tribological properties of deionized water and seawater) coatings. The introduction of N hinders the columnar structure growth of V-Al-C coating, the structure densification and the decrease of grain size, forming amorphous carbon coated nanocrystalline nanocomposite structure. The hardness was increased from 14 卤0.48 GPA to 24.5 卤0.8 GPA, and the toughness was greatly improved under dry air friction. The friction coefficient of V-Al-C coating is 0.70, and the friction coefficient of V-Al-C coating decreases to 0.42 when N is introduced. This is mainly due to the formation of V _ 2O _ 5 with lubricating effect by V-Al-C-N coating during friction, under the coupling lubrication of amorphous carbon and V _ S _ 2O _ 5. The friction coefficient of the coating decreases by 40%. For the same coating, the friction coefficient in deionized water and seawater decreases under the condition of larger air-dry friction, the main reason is that the water molecules adsorbed by the former can form boundary lubrication. The formation of Mg~(2 / Caco _ (2) in seawater can provide further lubricating effect, and the friction coefficient is the lowest in environmental friction process. After 30 min, V-Al-C coating was worn out due to serious abrasive wear, and the corrosion and wear of V-Al-C coating were synergistic. The wear rate of V-Al-C-N coating prepared by N-doping was the highest in seawater environment. The V-Al-C-N coating prepared by N-doping showed good wear resistance. In dry friction, the wear rate is 3.0 脳 10 ~ (-16) ~ (-1) N 路m ~ (-1) and 1.4 脳 10 ~ (10) ~ (-15) ~ (-1) N 路m ~ (-1) in seawater.
【作者单位】：中北大学材料科学与工程学院;中国科学院海洋新材料与应用技术重点实验室中国科学院宁波材料技术与工程研究所;
【基金】：国家自然科学基金项目No.51375475 江西省科技项目Nos.2015XTTD03和20161ACE50023 浙江省公益技术应用研究计划项目No.2016C31121~~
【分类号】：TB306
【正文快照】： corrosion resistance of coatings cannot meet the harsher marine environment,which needs to obtainmulti-functional hard coatings providing complex properties.The nanocomposite structure coatings con-taining nanocrystalline phase embedded in an amorphous m

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