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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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Facile and scalable preparation of ultra-large boron nitride nanosheets and their use for highly thermally conductive polymer composites

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Frontiers of Materials Science 2022年第1期16卷 119-131页

作者： Wenyu WU Bin GUO Xiaojing LIU Huaxin MA Zhao zhang Zhi zhang Minghao CUI Yu GU ruijun zhang State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Academic Affairs Office Tangshan Normal UniversityTangshan 063000China

Due to their excellent physical and chemical properties,boron nitride nanosheets(BNNSs)have shown great application potential in many ***,the difficulty in scalable preparation of large-size BNNSs is still the current factor that limits ***,a simple yet efficient microwave-assisted chemical exfoliation strategy is proposed to realize scalable preparation of BNNSs by using perchloric acid as the edge modifier and intercalation agent of *** as-obtained BNNSs behave a thin-layered structure(average thickness of 3.9 nm)with a high yield of~16%.Noteworthy,the size of BNNSs is maintained to the greatest extent so as to realize the preparation of BNNSs with ultra-large size(up to 7.1μm),which is the largest so far obtained for the top-down exfoliated *** from the large size,it can significantly improve the thermal diffusion coefficient and the thermal conductivity of polyvinyl alcohol by 51 and 62 times respectively,both showing a higher value than the one previously *** demonstrates that the prepared BNNSs have great promise in enhancing the thermal conductivity of polymer materials.

关键词： boron nitride nanosheet thermal conductivity chemical exfoliation large size

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Eco-friendly non-acid intercalation and exfoliation of graphite to graphene nanosheets in the binary-peroxidant system for EMI shielding

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Chinese Chemical Letters 2021年第11期32卷 3469-3473页

作者： Ping Wang Bin Guo Zhi zhang Weinan Gao Wei Zhou Huaxin Ma Wenyu Wu Junfeng Han ruijun zhang State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of EducationSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China

The development of the preparation strategy for high-quality and large-size graphene via eco-friendly routes is still a challenging ***,we have successfully developed a novel route to chemically exfoliate natural graphite into high-quality and large-size graphene in a binary-peroxidant *** system is composed of urea peroxide(CO(NH_(2))_(2)·H_(2)O_(2))and hydrogen peroxide(H_(2)O_(2)),where CO(NH_(2))_(2)·H_(2)O_(2)is used in preparing graphene for the first *** from the complete decomposition of CO(NH_(2))_(2)·H_(2)O_(2)and H_(2)O_(2)into gaseous species under microwave(MW)irradiation,no water-washing and effluent-treatment are needed in this chemical exfoliation procedure,thus the preparation of graphene in an eco-friendly way is *** resultant graphene behaves a large-size,high-quality and few-layer feature with a yield of~100%.Then 4µm-thick ultrathin graphene paper fabricated from the as-exfoliated graphene is used as an electromagnetic interference(EMI)shielding *** its absolute effectiveness of EMI shielding(SSE/t)is up to 34,176.9 dB cm^(2)/g,which is,to the best of our knowledge,among the highest values so far reported for typical EMI shielding *** EMI shielding performance demonstrates a great application potential of graphene paper in meeting the ever-increasingly EMI shielding demands in miniaturized electronic devices.

关键词： Graphene exfoliation Eco-friendly Graphene paper EMI shielding

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Low-dose IL-2 mitigates glucocorticoid-induced Treg impairment and promotes improvement of SLE

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Signal Transduction and Targeted Therapy 2023年第5期8卷 2041-2043页

作者： Haotian Zhou Xiaozhen Zhao ruijun zhang Miao Miao Wenwen Pei Zijun Li Yimin Li Jing He zhanguo Li Xiaolin Sun Department of Rheumatology and Immunology Clinical Immunology CenterBeijing Key Laboratory for Rheumatism Mechanism and Immune Diagnosis(BZ0135)Peking University People’s HospitalNo.11 Xizhimen South Street100044BeijingChina Department of Rheumatology Beijing Children’s HospitalCapital Medical UniversityNational Centre for Children’s Health100045BeijingChina Peking-Tsinghua Center for Life Science BeijingChina

Dear Editor,Previous studies have proved that regulatory T cell(Treg)insufficiency contributed to the development of autoimmune conditions including systemic lupus erythematosus(SLE).Conventional immunosuppressive treatment was reported to downregulate beneficial Tregs together with pathogenic effector immune cells,which may impede a rapid achievement of optimal therapeutic effects.

关键词： glucocorticoid lupus erythematosus SLE

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Synthesis and Electrochemical Properties of Nickel Hydroxides

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材料科学与工程（中英文B版） 2012年第6期2卷 376-380页

作者： Danyang Xie Jianhua Liu ruijun zhang Department of Environmental and Chemical Engineering Yanshan University Qinhuangdao 066004 China State Key Laboratory of Metastable Materials Science and Technology Yan Shan University Qinhuangdao 066004 China

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Normalizing Treatment Effects on Carbide Morphology and Mechanical Properties of Low Alloy Wear Resistant Cast Iron

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材料科学与工程（中英文版） 2010年第2期4卷 52-55页

作者： Deliang Meng Jianhua Liu ruijun zhang State Key laboratory of Metastable Materials Science and Technology YanShan University Qinhuangdao 066004 China School of Civil Engineering and Mechanics Yanshan University Qinhuangdao 066004 China

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Improvement to the Morphology of Carbides in Low Alloy White Cast Iron

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材料科学与工程（中英文版） 2010年第11期4卷 85-88页

作者： Deliang Meng Guirong Peng Jianhua Liu ruijun zhang State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China School of Civil Engineering and Mechanics Yanshan University Qinhuangdao 066004 China

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Influence of Heat Treatment on Mechanical Properties of Cu-45Cr-0.56Mo Alloy

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材料科学与工程（中英文版） 2010年第9期4卷 72-76页

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Microstructure and Mechanical Properties of Surfacing Layer of Ferro-Based Multiple Alloying

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材料科学与工程（中英文版） 2010年第12期4卷 47-50页

作者： Deliang Meng Guirong Peng Jianhua Liu ruijun zhang State Key laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China School of Civil Engineering and Mechanics Yanshan University Qinhuangdao 066004 China

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