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Effects of Friction Heat on the Tribological Properties of the Woven Self-lubricating Liner

Chinese Journal of Mechanical Engineering 2009年第6期22卷 918-924页

作者： YANG Yulin ZU Dalei ZHANG Ruijun qi xiaowen Key Laboratory of Fundamental Science of Mechanical Structure and Material Science under Extreme Condition for National Defence Yanshan University Qinhuangdao 066004 China State Key Laboratory of Metastable Materials Science and Technology. Yanskan Universiry qinhuangdao 066004 China

In the dry-sliding process of the woven self-lubricating liner which is used in the self-lubricating spherical plain bearing, the friction heat plays an important role in the tribological performances of the liner. It has important value to study on the relationship between tribological performances of the liner and the friction heat. Unforttmately, up to now, published work on this relationship is quite scarce. Therefore, the effect of friction heat on the tribological performances of the liner was investigated in the present work. The tribological behaviors of the liner were evaluated by using the high temperature end surface wear tester. Scanning electron microscopy （SEM） was utilized to examine the morphologies of worn surfaces of the liner and study the failure modes. Differential scanning calorimetry （DSC） measurement and X-ray diffraction （XRD） analysis were performed to study the behaviors of the wear debris. The temperature rise on the worn surface was calculated according to classical models. SEM observation shows that the dominating wear mechanism for the liner is mainly affected by friction shear force, contact pressure and friction heat. Higher fusion heat for the wear debris than that for the pure polytetrafluroethylene （PTFE） indicates that the PTFE is the main portion of the wear debris, and, the PTFE in the wear debris shows a higher crystallisation degree owing to the effects of friction shear force and the friction heat. Combining the calculated temperature rise results with the wear rate of the liner, it can be concluded that the effects of temperature rise o n the tribological performances of the liner become more obvious when the temperature rise exceeds the glass transition temperature （Tg） of the PTFE. The wear resistance of the liner deteriorates dramatically when the temperature rise approaches to the melting point （Ton） of the PTFE. The tribological performances of the liner can be improved when the temperature rise exceeds Tg but is far l

关键词： woven fabric self-lubricating liner friction and wear friction heat differential scanning calorimetry thermal analysis transfer film

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Sliding Wear of the Hybrid Kevlar/PTFE Fabric Reinforced Phenolic Composite Filled with Nano-titania

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Chinese Journal of Mechanical Engineering 2011年第1期24卷 154-159页

作者： YANG Yulin HUANG Shijun ZU Dalei ZHANG Ruijun qi xiaowen Key Laboratory of Fundamental Science of Mechanical Structure and Material Science under Extreme Condition for National Defence Yanshan University Qinhuangdao 066004 China State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China

The Kevlar/polytetrafluroethylene（Kevlar/PTFE） fabric composite can be used as a self-lubricating liner of the self-lubricating *** types of nano-particles can improve the tribological performance of the polymer-based ***,up to now,published work on the effect of nano-particles on the tribological performance of the fabric composite which can be used as a self-lubricating liner is quite ***,for the purpose of exploring a way to significantly improve the tribological performance of the fabric composite,the tribological performance of the Kevlar/PTFE fabric composite filled with nano-titania is evaluated by using the block-on-ring wear *** scanning electron microscopy is utilized to observe the morphologies of worn surfaces of the fabric composites and the *** tensile properties of the composites are evaluated on the universal material testing *** test results show that the addition of nano-titania at a proper mass fraction of the matrix resin improves the wear resistance and the tensile strength,decreases the friction coefficient,and makes the wear volume of the composite reach a relative steady state more quickly;plastic deformation and microcutting are important for the wear of the fabric composite;a lubricating layer is formed on the worn surface of the composite during sliding,and the lubricating layer is critical for the tribological performance of the composite;the formation and properties of the lubricating layer are influenced by the nano-titania *** proposed study on the effect of nano-titania on the tribological performance of the Kevlar/PTFE fabric composite,especially on the evolution of the worn surface of the composite,provides the basis for further understanding of the influence mechanism of the nano-particles on the tribological performance of the composite and explores a method of improving the tribological performance of the composite.

关键词： hybrid Kevlar/PTFE fabric composite self-lubricating liner nano-titania friction and wear lubricating layer

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Influence of Weave Structures on the Tribological Properties of Hybrid Kevlar/PTFE Fabric Composites

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Chinese Journal of Mechanical Engineering 2012年第5期25卷 1044-1051页

作者： GU Dapeng YANG Yulin qi xiaowen DENG Wei SHI Lei Key Laboratory of Fundamental Science of Mechanical Structure and Material Science under Extreme Condition for National Defence Yanshan UniversityQinhuangdao 066004China

The existing research of the woven fabric self-lubricating liner mainly focus on the tribological performance improvements and the service life raised by changing different fiber type combinations, adding additive modification, and performing fiber surface modification. As fabric composites, the weave structures play an important role in the mechanical and tribological performances of the liners. However, hardly any literature is available on the friction and wear behavior of such composites with different weave structures. In this paper, three weave structures （plain, twill 1/3 and satin 8/5） of hybrid Kevlar/PTFE fabric composites are selected and pin-on-flat linear reciprocating wear studies are done on a CETR tester under different pressures and different frequencies. The relationship between the tensile strength and the wear performance are studied. The morphologies of the worn surfaces under the typical test conditions are analyzed by means of scanning electron microscopy （SEM）. The analysis results show that at 10 MPa, satin 8/5 performs the best in friction-reduction and antiwear performance, and plain is the worst. At 30 MPa, however, the antiwear performance is reversed and satin 8/5 does not even complete the 2 h wear test at 16 Hz. There is no clear evidence proving that the tensile strength has an influence on the wear performance. So the different tribological performance of the three weave structures of fabric composites may be attributed to the different PTFE proportions in the fabric surface and the different wear mechanisms. The fabric composites are divided into three regions： the lubrication region, the reinforced region and the bonding region. The major mechanisms are fatigue wear and the shear effects of the friction force in the lubrication region. In the reinforced region fiber-matrix de-bonding and fiber breakage are involved. The proposed research proposes a regional wear model and further indicates the wear process and the wear mechanism o

关键词： hybrid Kevlar/PTFE fabric composite friction wear weave structure scanning electron microscopy

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Fabrication of high-stability Ni-PSF@PAO40 microcapsules and their lubricating properties in polyamide 6

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Friction 2022年第12期10卷 1985-1999页

作者： Wenli ZHANG xiaowen qi Xiao YANG Yu DONG Bingli FAN Lei LIANG School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Key Laboratory of Self-Lubricating Spherical Plain Bearing technology of Hebei Province Yanshan UniversityQinhuangdao 066004China Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing Yanshan UniversityQinhuangdao 066004China School of Civil and Mechanical Engineering Curtin UniversityPerthWA 6845Australia Shanghai Research Institute of Synthetic Resins Co. Ltd.Shanghai 201702China

Novel Ni-PSF@PAO40 microcapsules(NPPMS)with high stability were prepared by using a combined processing method of electroless nickel plating and solvent *** results indicate that Ni is completely assembled on the surfaces of PSF/PAO40 microcapsules with the encapsulation capacity of NPPMS achieved at 50%.Organic solvents immersion shows that NPPMS have an excellent chemical *** thermal stability tests reveal that the softening temperature of NPPMS is increased up to over 400℃ while it becomes lower than 200℃ for PSF/PAO40 ***,NPPMS were embedded into polyamide 6(PA6)to prepare PA6/NPPMS *** cross-sectional morphology shows that NPPMS are intact in PA6 *** microhardness of PA6 is effectively improved with the incorporation of *** compared with neat PA6,the coefficient of friction(COF)for PA6/NPPMS composites with 10%NPPMS could be reduced by 87.7%(from 0.49 to 0.06)and the wear rate could be decreased by 96.8%(from 1.29×10^(-5) to 4.15×10^(-7) mm^(3)/(N·m)).Further studies confirmed that increasing test loads and test temperatures was beneficial to improve the lubrication performance of NPPMS despite the opposite trend occurred when increasing the sliding *** has been demonstrated that synergistic effects between PAO40 and Ni layer play an important role in improving the tribological properties of ***,NPPMS significantly improve the ability of microcapsules to resist a harsh environment,which has important scientific significance for expanding the use of microcapsules more practically in self-lubricating composites.

关键词： microcapsules electroless nickel high temperature resistant polyamide 6(PA6) friction and wear

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Adsorption limitation investigation on olefins for Cu–BTC

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Friction 2024年第4期12卷 606-617页

作者： Xiao YANG Yunbo WANG Weihua CAO Ruizheng JIANG Guoxin XIE Yuying CAO xiaowen qi School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Key Laboratory of Self-Lubricating Spherical Plain Bearing Technology of Hebei Province Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing Yanshan UniversityQinhuangdao 066004China

To utilize Cu-benzene-1,3,5-tricarboxylate(Cu-BTC)adsorbed lubricant oils in the self-lubricating field,the adsorption properties of Cu-BTC on different 1-olefins must be *** this work,1-hexene,1-octene,1-nonene,1-decene,1-undecene,and 1-dodecene were studied by the Monte Carlo method and *** adsorption limit of Cu-BTC for n-olefins was determined as 1-undecene by the adsorption *** suggested a limit for even straight-chain molecules to the adsorption of *** maximum ratio of the olefin length of the largest pore diameter(L/D)of Cu-BTC was approximately ***,theoretical calculations(radial distribution function(RDF))and experiments(infrared(IR)spectra)confirmed the interaction of n-olefin adsorbates and the Cu-BTC framework occurred between the-CH=of olefins and the Cu and O atoms of the Cu-BTC *** work adds to the understanding and investigation of the adsorption of liquid lubricants using Cu-BTC as a metal-organic framework(MOF).

关键词： metal-organic framework(MOF) Cu-benzene-1,3,5-tricarboxylate(Cu-BTC) Monte Carlo method adsorption properties 1-olefins

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Flexible metal–organic frameworks based self-lubricating composite

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Friction 2024年第8期12卷 1816-1827页

作者： Xiao YANG Yunbo WANG Weihua CAO Jinghan ZHENG Changxin LIU Bingli FAN xiaowen qi School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Key Laboratory of Self-Lubricating Spherical Plain Bearing Technology of Hebei Province Yanshan UniversityQinhuangdao 066004China Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing Yanshan UniversityQinhuangdao 066004China Department of Materials.Imperial College London London SW72AZUK

To expand the use of metal–organic frameworks(MOFs)based self-lubricating composite,flexible MOFs MIL-88D has been studied as a nanocontainer for loading *** this work,the mechanism of oleamine adsorption and desorption by MIL-88D was investigated through molecular simulations and *** simulations showed that the oleamines can be physically adsorbed into open MIL-88Ds with the Fe and O atoms of MIL-88D interacting with oleamine *** temperature can cause Ole@MIL-88D to release more oleamines,while higher pressure on Ole@MIL-88D caused less oleamines *** the Ole@MIL-88D was incorporated into epoxy resin(EP)for friction *** optimum mass ratio of MIL-88D to EP is 15 wt%,and the EP/Ole@MIL-88D prefers light load and high frequency *** work suggests that flexible MOFs can be used as a nanocontainer for loading lubricant,and can be used as a new self-lubricating composite.

关键词： self-lubricating composite metal–organic framework(MOFs) MIL-88D molecular dynamic(MD)simulation

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The Study of the Application of Metacognitive Strategies in EFL Writing in China

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Sino-US English Teaching 2021年第11期18卷 311-316页

作者： qi xiaowen University of Shanghai for Science and Technology ShanghaiChina

EFL writing in China is tended to be de-emphasized with the emphasis on oral proficiency in communicative *** is ample evidence to indicate the insufficiency in EFL writing course and the ineffectiveness of students’efforts to develop writing *** integrate metacognition into EFL writing instruction will benefit writing instruction by laying emphasis on both approaches to writing instruction,and to train teachers as well as students to teach and learn with metacognition,raising EFL writing instructors’self-awareness in teaching and training students to become self-regulated learners.

关键词： metacognitive strategies EFL writing language teaching

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基于Steffensen迭代和模糊信息的节点定位算法

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传感技术学报 2018年第2期31卷 289-296页

作者：齐小文郑州工程技术学院信息工程学院郑州450044

为了提高无线传感器网络节点定位精度,提出了一种基于Steffensen迭代和模糊信息的节点定位算法。算法在模糊信息定位方法的基础上,通过引入Steffensen迭代求精提高节点定位精度。算法将锚节点分为静态锚节点和移动锚节点,利用移动锚节... 详细信息

为了提高无线传感器网络节点定位精度,提出了一种基于Steffensen迭代和模糊信息的节点定位算法。算法在模糊信息定位方法的基础上,通过引入Steffensen迭代求精提高节点定位精度。算法将锚节点分为静态锚节点和移动锚节点,利用移动锚节点不断的运动来辅助静态锚节点进行定位。首先利用节点间的模糊信息实现未知节点位置的粗略定位,然后利用Steffensen迭代对节点位置进行不断迭代求精,以实现未知节点的精确定位。通过仿真实验证明,相比3D-ADAL算法和改进的TOF测距算法,本文算法不仅降低了定位误差率,减小了网络的通信开销,还提高了节点定位效率。

关键词： Steffensen迭代求精模糊信息节点定位静态锚节点移动锚节点

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基于犹豫模糊元最小公倍数拓展法及模糊熵的双边概率语言多准则决策方法

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系统工程理论与实践 2022年第8期42卷 2243-2257页

作者：戚筱雯张俊岭梁昌勇浙江财经大学工商管理学院杭州310018 浙江师范大学经济与管理学院金华321004 合肥工业大学管理学院合肥230009

双边概率语言术语集能在高度不确定性决策环境下更细致完整地刻画决策者复杂评价信息,其决策理论与方法亟需深入研究.本文针对具有双层评价指标结构且权重未知的典型复杂决策问题,提出一种更具实际适应性的双边概率语言科学决策方法.首... 详细信息

双边概率语言术语集能在高度不确定性决策环境下更细致完整地刻画决策者复杂评价信息,其决策理论与方法亟需深入研究.本文针对具有双层评价指标结构且权重未知的典型复杂决策问题,提出一种更具实际适应性的双边概率语言科学决策方法.首先,提出基于最小公倍数的犹豫模糊元拓展法以避免主观态度假设等限制及相应潜在信息扭曲,并藉此定义了双边概率语言距离测度、熵和相对熵测度.其次,利用熵和交叉熵开发二级指标的客观权重确定模型,并引入BWM方法来确定一级指标的主观权重.进一步,基于上述方法与模型构建了面向双层评价指标结构决策问题的双边概率语言多准则决策方法.最后,可持续供应商选择案例研究与实验对比分析验证了所研决策方法的有效性与优越性.

关键词：双边概率语言术语集距离测度熵测度交叉熵测度可持续供应商选择

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超硬涂层材料滚动接触疲劳试验机的研制

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润滑与密封 2006年第10期31卷 43-45,51页

作者：杨育林齐效文张瑞军燕山大学机械工程学院河北秦皇岛066004

在总结分析目前国内外表面超硬涂层零件接触疲劳失效行为评估技术的基础上,依据超硬涂层零件接触疲劳失效机制模型,自主研制了一种超硬涂层材料滚动接触疲劳试验机。介绍了该试验机的设计原理和特殊功能,采用该试验机对51306纳米超硬材... 详细信息

在总结分析目前国内外表面超硬涂层零件接触疲劳失效行为评估技术的基础上,依据超硬涂层零件接触疲劳失效机制模型,自主研制了一种超硬涂层材料滚动接触疲劳试验机。介绍了该试验机的设计原理和特殊功能,采用该试验机对51306纳米超硬材料涂层轴承滚动接触疲劳失效行为进行了试验评定。试验证明所研制的超硬涂层材料滚动接触疲劳试验机智能检测控制系统能够动态探测诊断涂层轴承表面初始疲劳裂纹并实现急停,可捕捉试验轴承表面疲劳初始状态,为超硬涂层零件接触疲劳失效机制分析提供可靠的试验依据。

关键词：试验机滚动接触疲劳超硬材料涂层

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