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| 1 | AlCoCrFeNi高熵合金的高温摩擦磨损性能显示文摘AlCoCrFeNi高熵合金因其优异的综合力学性能而有望成为新一代高温结构材料,但对其高温摩擦磨损性能的研究还较为少见.本文中应用放电等离子烧结(SPS)技术制备了AlCoCrFeNi高熵合金,研究了其显微组织和力学性能,系统地考察了其在室温至800℃时的摩擦磨损性能.结果表明:应用SPS技术制备的AlCoCrFeNi高熵合金主要由FCC相、无序BCC相和少量有序BCC相组成;呈网格状分布的FCC相使高熵合金具有良好的塑性和韧性,而呈等轴状分布的BCC相赋予了高熵合金优异的强度;高熵合金室温至800℃时的摩擦系数在0.43~0.51之间,磨损率低于10–5mm3/(N·m).室温至中温阶段主要为磨粒磨损,中温至高温阶段的磨损机制为磨粒磨损、黏着磨损和塑性变形综合作用.高温下高熵合金表面形成了一层主要由为Al2O3和Cr2O3组成的氧化物膜,在一定程度上起到抗磨作用. | 张爱军 韩杰胜 苏博 孟军虎 | 2017 | 摩擦学学报2017，37，6： | 18 |
| 2 | Variation of the friction conditions in cold ring compression tests of medium carbon steel显示文摘Lubrication and friction conditions vary with deformation during metal forming processes.Significant macro-variations can be observed when a threshold of deformation is reached.This study shows that during the cold compression processing of#45(AISI 1045)steel rings,the magnitude of friction and surface roughness(Ra)changes significantly upon reaching a 45%reduction in ring height.For example,the Ra of compressed ring specimens increased by approximately 55%immediately before and after reaching this threshold,compared to an 18% or 25%variation over a 35%-45%or a 45%-55%reduction in height,respectively.The ring compression test conducted by this study indicates that the Coulomb friction coefficient and Tresca friction factor mare 0.105 and 0.22,respectively,when the reduction in height is less than 45%;and 0.11 and 0.24,respectively,when the reduction in height is greater than 45%. | Dawei ZHANG Bingkun LIU Jingxiang LI Minchao CUI Shengdun ZHAO | 2020 | Friction2020，8，2： | 5 |
| 3 | Tribological behavior of black phosphorus nanosheets as water-based lubrication additives显示文摘Black phosphorus(BP)with a layered structure has been used gradually as a lubrication additive in the tribological area.In this study,BP powders are produced via an easy method of high-energy ball milling using red phosphorus as a raw material.Subsequently,BP nanosheets are prepared via liquid exfoliation in N-methyl pyrolidone solvent.The tribological behavior of BP nanosheets as water-based lubrication additives(BP-WL)is evaluated under Ti6Al4V(TC4)/GCr15 contact.The results suggest that the 70 mg/L BP-WL sample exhibits excellent lubrication performance,whose coefficient of friction(COF)and ball wear rate reduced by 32.4%and 61.1%,respectively,compared with those of pure water.However,as the load increased,the tribological properties of BP-WL reduced gradually because of the agglomeration of BP nanosheets.Based on tribological experiments and worn surface analysis,boundary lubrication mechanisms are proposed.The friction reduced,which is primarily attributed to the low interlaminar shear and adsorption of BP nanosheets.In addition,a tribochemical reaction film comprising TiO_(2),Al_(2)O_(3),and Fe_(2)O_(3)effectively protects the surface of titanium alloy/steel from wear.This new water-based lubrication additive can be used to process titanium alloys. | Qingjuan WANG Tingli HOU Wei WANG Guoliang ZHANG Yuan GAO Kuaishe WANG | 2022 | Friction2022，10，3： | 3 |
| 4 | Graphite-based solid lubricant for high-temperature lubrication显示文摘High-temperature solid lubricants play a significant role in the hot metal forming process.However,preparing high-temperature solid lubricant is formidably challenging due to the stern working conditions.Here we successfully develop a new type of eco-friendly high-temperature graphite-based solid lubricant by using amorphous silica dioxide,aluminum dihydrogen phosphate,and solid lubricant graphite.The solid lubricating coating exhibits excellent tribological properties with a very low friction coefficient and good wear protection for workpiece at high temperature under the air atmosphere.An array of analytical techniques reveals the existence of solid lubricant graphite in the lubricating coating after the high-temperature friction test.A synergistic effect between the protective surface film and the solid lubricant graphite is proposed to account for such superior lubricating performance.This work highlights the synergistic effect between the protection layer and the lubricant graphite and further provides the insight in designing the high-temperature solid lubricant. | Wenjuan HUAI Chenhui ZHANG Shizhu WEN | 2021 | Friction2021，9，6： | 2 |
| 5 | 温成形界面粉末润滑的摩擦特性与表面膜分析显示文摘在温成形过程中,由于需要达到一定的温度且压力较大,传统的油脂已不能实现有效润滑甚至失去润滑能力,而固体粉末润滑的优点显得十分突出,固体粉末的静态承载特性和环境适应性使其在温成形中广泛应用。本文采用环境可控多功能摩擦磨损试验机,在一定温度条件下进行粉末润滑特性试验来研究载荷、转速对粉末润滑特性的影响,并对摩擦系数、润滑膜表面状况作出分析评价。结果表明:粉末润滑在低载荷情况下,能正常工作,磨损不严重;适当增加载荷,摩擦系数会降低,但表面磨损会加重;适当增加转速可以有良好的减摩效果;同等载荷的情况下,提高转速会加速磨损。 | 刘付春 昌晶晶 王伟 顾伟 | 2016 | 锻压技术2016，41，1： | 2 |
| 6 | Galling phenomena in metal forming显示文摘Galling phenomena in metal forming not only affect the quality of the engineered surfaces but also the success or failure of the manufacturing operation itself.This paper reviews the different galling conditions in sheet and bulk metal forming processes along with their evolution and the effects of temperature on galling.A group of anti-galling methods employed to prevent galling defects are also presented in detail.The techniques for quantitatively measuring galling are introduced,and the related prediction models,including friction,wear,and galling growth models,are presented to better understand the underlying phenomena.Galling phenomena in other processes similar to those occurring in metal forming are also examined to suggest different ways of further studying galling in metal forming.Finally,future research directions for the study of galling in metal forming are suggested. | Kuniaki DOHDA Masahito YAMAMOTO Chengliang HU Laurent DUBAR Kornel F.EHMANN | 2021 | Friction2021，9，4： | 1 |
| 7 | 真空等温锻造润滑技术显示文摘为了改善真空等温锻造中的润滑问题,针对两种自制的玻璃润滑剂RD-1和GR-2,采用座滴法测量了润湿角,采用示差法测定了线膨胀系数,采用旋转法测定了高温黏度,采用试烧法并结合扫描电镜观察了涂层与基体的结合情况。在不同工艺条件下开展了真空等温压缩试验,以探究摩擦因数与工艺参数的关系。试验结果表明:在真空等温锻造中,RD-1玻璃润滑剂具有更好的润湿性和更低的高温黏度;两种玻璃润滑剂的线膨胀系数相近,界面涂层厚度均为40~50μm;在950~1000℃的锻造温度区间,RD-1玻璃润滑剂的摩擦因数更低,表现出更好的润滑性能,更适合于1000℃以下的真空等温锻造工艺。 | 周耀青 贺小毛 周乐育 | 2023 | 锻压技术2023，48，12： | 0 |
| 8 | 基于有限元与环压试验的高分子润滑剂摩擦行为研究显示文摘将研制的高分子润滑剂在45钢基体表面进行涂覆,通过有限元与实际试验测试润滑剂的实用效果,并利用摩擦磨损试验与扫描电子显微镜表征其摩擦特性,结果表明所制备的高分子润滑剂摩擦系数最小,润滑性能好。利用DeForm-3D软件确定环压试验的理论校准曲线,与实际环压试验结果进行对比,分析高分子润滑剂的摩擦行为,结果表明润滑剂与模具基体发生以物理吸附为主的黏合现象,润滑剂的保护作用有效减少了模具零件之间的摩擦磨损,延长了模具的使用寿命,为更好地指导实践生产提供了借鉴。 | 申晨彤 龚红英 刘尚保 尤晋 周志伟 嵇友迪 贾星鹏 赵小云 廖泽寰 | 2022 | 模具工业2022，48，1： | 0 |
| 9 | Investigation of the friction coefficient evolution and lubricant breakdown behaviour of AA7075 aluminium alloy forming processes at elevated temperatures显示文摘The lubricant behaviour at elevated temperatures was investigated by conducting pin-on-disc tests between P20 tool steel and AA7075 aluminium alloy. The effects of temperature, initial lubricant volume, contact pressure and sliding speed on the lubricant behaviour(i.e. evolutions of the coefficient of friction(COF) and the breakdown phenomenon) were experimentally studied. The evolutions of COF at elevated temperatures consisted of three distinct stages with different friction mechanisms. The first stage(stage Ⅰ) occurred with low friction when the boundary lubrication was present. The second stage(stage Ⅱ) was the transition process in which the COF rapidly increased as the lubricant film thickness decreased to a critical value. In the final plateau stage(stage Ⅲ), lubricant breakdown occurred and intimate contact at the interface led to high friction values. At the low friction stage(stage Ⅰ), the value of COF increased with increasing temperature. The increase in temperature, contact pressure and sliding speed as well as the decrease in initial lubricant volume accelerated the lubricant breakdown. | Xiao Yang Qunli Zhang Yang Zheng Xiaochuan Liu Denis Politis Omer El Fakir Liliang Wang | 2021 | International Journal of Extreme Manufacturing2021，3，2： | 0 |
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