铝合金作动部件表面复合PTFE硬氧膜层减摩抗磨性能  

Friction Reduction and Wear Resistance of a Composite PTFE Hard Anodized Layer on Aluminum Alloy Actuator Parts

作　　者：胡波 任俊辉 石晓飞 白常宁 强力[2,3] 张俊彦[2,3] HU Bo;REN Junhui;SHI Xiaofei;BAI Changning;QIANG Li;ZHANG Junyan(Aviation Industry of Qing’an Group Co.,Ltd.,Xi’an 710077,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Key Laboratory of Science and Technology on Wear and Protection of Materials,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]航空工业庆安集团有限公司,西安710077 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,兰州730000 [3]中国科学院材料磨损与防护重点实验室,兰州730000

出　　处：《中国表面工程》2025年第1期278-289,共12页China Surface Engineering

基　　金：国家科技重大专项(2019-Ⅶ-0015-0155);兰州化物所青年科技工作者协同创新联盟合作基金(HZJJ23-3)。

摘　　要：铝合金材料比强度高、易于加工,但表面硬度低,耐磨性差,其表面经硬质阳极氧化处理后具有耐磨、绝缘及耐腐蚀性等,广泛应用于航空作动系统。然而,硬质阳极氧化膜层(硬氧膜层)存在孔隙率大、表面粗糙度及摩擦因数高等问题,易加剧摩擦配副磨损而泄漏,严重制约其实际服役。为了改善铝合金硬质阳极化膜层表面粗糙度,提升其减摩性能以满足新一代航空作动部件对减重及高机动性的服役需求,利用原位合成技术在铝合金表面制备复合PTFE硬氧膜层,研究表面粗糙度对其表面复合PTFE硬氧膜层和传统硬氧膜层不同配副方式下摩擦磨损行为的影响,并对复合PTFE硬氧膜层耐磨性能进行工程化模拟验证。研究结果表明:复合PTTE硬氧膜层较传统硬氧涂层更加致密,且硬度更高;其摩擦因数(0.08)较传统硬氧涂层(0.14)降低约40%,磨损量则降低2个数量级;在产品功能性试验中未发现脱落,磨损量小,能够满足产品性能需求;在产品实际使用中具有自抛光效应,这更有利于缩短产品生产周期及大幅度降低成本。提出一种更有利于缩短产品生命周期、大幅降低成本的复合硬氧膜层工艺,并在产品功能性试验中得到检验,在工程化应用中具有重要的推广意义。Hydraulic actuators are widely used in aircraft wings,doors,and landing gears.The reciprocating seal is a common seal type.Seal failure can significantly affect aircraft mission execution and flight safety.The surface roughness of the seal pair is a major controllable parameter in engineering and greatly influences sealing performance.Therefore,analyzing the effect of surface roughness on the sealing performance of actuators is both theoretically and practically significant.The Al_(2)O_(3) oxide film formed on the surface of aluminum alloys after hard anodic oxidation has certain wear resistance,insulation,and corrosion resistance,making it widely used in aviation hydraulic systems.However,the hard anodized film(hard oxygen film)has problems such as high porosity,roughness,and friction coefficient,which can exacerbate wear and tear on the friction mating surfaces,severely limiting its practical service.Hard anodization of aluminum alloy is a dynamic process involving the formation and dissolution of the film layer in a low-temperature sulfuric acid solution.The film layer is generally divided into a compact layer adjacent to the substrate and a looser layer extending outward.Consequently,the surface hardness is low,and the roughness is inadequate.An in-situ synthesis technology is utilized to enhance the surface roughness of the aluminum alloy hard anodized film and improve its friction-reducing performance,thus meeting the service requirements of the new generation of aeronautical actuators for weight reduction and high mobility.First,wed added 15–20 mL/L of PTFE(Polytetrafluoroethylene)concentrated dispersion liquid and a proper amount of composite surfactant into the anodizing bath liquid.We then stirred it for 30 min using a direct current constant current method at a current density at the beginning of hard anodic oxidation of 0.5–1 A/dm^(2).The current density was increased every 5 min until the desired current density was reached,where the film thickness required by the process was maintained to comple

关 键 词：铝合金作动部件 复合PTFE硬质阳极化膜层 摩擦学性能 工程化验证 

分 类 号：TG174[金属学及工艺—金属表面处理]