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Friction 2022年第9期10卷 1393-1404页

作者： Fu WANG Lunlin SHANG guangan zhang Zhaofeng WANG State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Polyethylene glycol derived carbon quantum dots nanofluids were synthesized via a slow thermal oxidation process.The size of carbon quantum dots was ca.2 nm and had a decreasing trend with the increase of oxidation time.When used as lubricant in a diamond-like carbon film/bearing steel interface,the nanofluids achieved an ultra-low friction coefficient(μ≈0.02),much lower than that of original polyethylene glycol(μ=0.12).The worn surface analyses revealed that the nanofluids could effectively inhibit the tribo-oxidation of steel counterpart that occurred under original polyethylene glycol lubrication,and hence reduced the abrasion component of friction.Especially,the poly-hydroxyl carbon dots and oxidized polyethylene glycol species in nanofluids induced a hydroxyl-rich sliding interface via their tribochemical reactions with friction surfaces,which promoted the adsorption of polyethylene glycol molecules on sliding surfaces.Along with the mild corrosion wear of steel counterface,this shifted the boundary lubrication to a mixed/film lubrication regime,thereby achieving an ultra-low friction coefficient.The above results suggest that the polyethylene glycol derived carbon quantum dots nanofluids should be a quite excellent candidate lubricant for solid–liquid synergy lubrication based on diamond-like carbon films.

关键词： polyethylene glycol diamond-like carbon films ultra-low friction synergy lubrication

Si-DLC films deposited by a novel method equipped with a co-potential auxiliary cathode for anti-corrosion and anti-wear application

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Journal of Materials Science & Technology 2022年第14期109卷 114-128页

作者： Xubing Wei Shaomiao Shi Chuangming Ning Zhibin Lu guangan zhang State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

A novel DLC film deposition method was proposed to realize the deposition of DLC film on the surface of complex shaped workpiece.Meanwhile,Si-DLC film was deposited on the surface of M2 high-speed steel(HSS M2)and 304 stainless steel(304SS),and the microstructure,surface roughness,mechanical properties,corrosion resistance and tribological properties of Si-DLC films were characterized in detail.Results show that Si-DLC film at different axial positions of the auxiliary cathode possesses similar microstructure,film thickness and surface roughness,and the as-deposited Si-DLC film shows the low intrinsic stress of<0.3 GPa.Compared with the 304SS substrate,the Si-DLC film presents more noble corrosion potential,lower corrosion current density and higher polarization resistance,exhibiting higher corrosion resistance.Moreover,the Si-DLC film exhibits higher hardness,elastic factor and plastic factor than HSS M2 substrate and the corresponding adhesive strength is more than 10 N.The Si-DLC film sliding against GCr15 steel ball shows a lower friction coefficient than that of HSS M2 substrate and the wear rate of GCr15 steel ball sliding against the Si-DLC is lower than that of HSS M2 substrate.In addition,this novel method was used to deposit Si-DLC film on gears,drills and bearings without rotating sample racks.As a consequence,this method possesses great potential and can be generalized for the deposition of DLC film on the surface of complex shape workpiece.

关键词： Si-DLC film Co-potential auxiliary cathode Tribology Corrosion Complex shaped workpiece

Mechanism of thermoviscoelasticity driven solid-liquid interface reducing friction for polymer alloy coating

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Friction 2023年第9期11卷 1606-1623页

作者： Sheng TAN Yimin LUO Junhua YANG Wei WANG Xia LI Baoguang JIA Zhuangzhu LUO guangan zhang School of Materials Sun Yat-sen UniversityShenzhen 518107China The 14th Research Institute of China Electronics Technology Group Corporation Nanjing 210039China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

High-temperature ablation is a common failure phenomenon that limits the service life of the transmission parts on heavy-duty machines used in heavy load,high temperature,high shock conditions due to in-sufficient supply of lubricating oil and grease.Traditional self-lubricating coatings prepared by inorganic,organic or organic-inorganic hybrid methods are prone to be oxidated at high temperatures to lose their friction reducing function,so that it is difficult to meet the engineering requirements of high-temperature lubrication.We design viscoelastic polymer coatings by a high-temperature self-lubricating and wear-resistant strategy.Polytetrafluoroethylene(PTFE,T_(m)=329℃)and polyphenylene sulfide(PPS,T_(g)=84℃,T_(m)=283℃)are used to prepare a PTFE/PPS polymer alloy coating.As the temperature increases from 25 to 300℃,the PTFE/PPS coating softens from glass state to viscoelastic state and viscous flow state,which is owing to the thermodynamic transformation characteristic of the PPS component.Additionally the friction coefficient(μ)decreased from 0.096 to 0.042 with the increasing of temperature from 25 to 300℃.The mechanism of mechanical deformation and surface morphology evolution for the PTFE/PPS coating under the multi-field coupling action of temperature(T),temperature–centrifugal force(T–F_(ω)),temperature–centrifugal force–shearing force(T–F_(ω)–F_(τ))were investigated.The physical model of“thermoviscoelasticity driven solid–liquid interface reducing friction”is proposed to clarify the self-lubricating mechanism determined by the high-temperature viscoelastic properties of polymers.The high-temperature adjusts the viscosity(η)of the coating,increases interface slipping and intensifies shear deformation(τ),reducing the friction coefficient.The result is expected to provide a new idea for designing anti-ablation coatings served in high temperature friction and wear conditions.

关键词： self-lubricating polymer coating viscoelastic state solid-liquid interface friction reduction hightemperature tribology

B_(4)C&H-DLC薄膜在过氧化氢溶液中的摩擦学行为研究

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摩擦学学报（中英文） 2024年第4期44卷 562-572页

作者：朱国菁李文波曹学乾尚伦霖孔令刚张广安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甘肃兰州730000 兰州交通大学光电技术与智能控制教育部重点实验室甘肃兰州730070

采用闭合场非平衡磁控溅射技术在316L不锈钢表面沉积硼、氢掺杂类金刚石碳(B_(4)C&H-DLC)薄膜,利用扫描电镜(SEM)、Raman、X射线光电子能谱仪(XPS)、纳米压痕和线性往复摩擦试验机等系统分析了B_(4)C&H-DLC薄膜的结构、力学性能及过氧... 详细信息

采用闭合场非平衡磁控溅射技术在316L不锈钢表面沉积硼、氢掺杂类金刚石碳(B_(4)C&H-DLC)薄膜,利用扫描电镜(SEM)、Raman、X射线光电子能谱仪(XPS)、纳米压痕和线性往复摩擦试验机等系统分析了B_(4)C&H-DLC薄膜的结构、力学性能及过氧化氢水溶液中与不同对偶球的摩擦学行为.结果表明:B_(4)C&H-DLC薄膜在过氧化氢环境中与Al_(2)O_(3)球相对摩擦时,有严重的磨粒磨损行为,摩擦系数与磨损率较高.此外,B_(4)C&H-DLC薄膜在过氧化氢环境中与Si_(3)N_(4)和SiC球相对摩擦时发生了复杂的摩擦化学反应,形成了硅胶和硼酸的摩擦化学产物,发挥了减摩抗磨作用[磨损率较低分别为0.8×10^(-7)和1.0×10^(-7)mm^(3)/(N·m)].因此,本研究为碳基薄膜在氧化条件下摩擦副的合理设计和应用提供了试验依据,同时也为保护在苛刻环境工作的机械部件提供了1种可行方法.

关键词：类金刚石碳摩擦配副双氧水硅氧化合物元素掺杂

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Optimization via response surface methodology of the synthesis of a dust suppressant and its performance characterization for use in open cut coal mines

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Journal of Environmental Sciences 2022年第11期34卷 211-223页

作者： Hu Jin Yansong zhang guangan Wu Junjie Yang Nan Li College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China Qingdao Intelligent Control Engineering Center for Production Safety Fire Accident Qingdao 266590China

To relieve dust pollution in open cut coal mines and reduce the hazards of coal dust pollution to the environment and workers we optimized the synthesis of a dust suppressant by graft copolymerization of environmentally friendly soy protein isolate with methyl methacrylate.This dust suppressant could effectively control dust pollution in open cut coal mines. The optimized conditions for graft copolymerization in this case were determined by a response surface experiment designed with Design-Expert 10 software. Characterization by scanning electron microscopy showed a significant morphology change of the dust suppressant and the generation of a rigid and dense layer on its surface after interacting with coal dust.The layer exhibited good bonding and dust suppression performance. The analysis with Fourier-transform infrared spectroscopy revealed the appearance of new absorption peaks near 1300, 1072, and 1631 cm, demonstrating effective graft copolymerization. The proposed dust suppressant exhibited excellent wind erosion resistance, with a resistance that exceeded 90% at a wind speed of 6.5 m/sec. The successful graft copolymerization and effective bonding and curing of the dust suppressant on coal dust were experimentally verified.This is of great significance to the control of coal dust pollution.

关键词： Environmental dust control Dust suppressant Response surface method Graft copolymerization Performance characterization Single factor method

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Star polymer donors

Journal of Semiconductors 2022年第7期43卷 1-3页

作者： Jiamin Cao guangan Nie Lixiu zhang Liming Ding Key Laboratory of Theoretical Organic Chemistry and Functional Molecule(MoE) School of Chemistry and Chemical EngineeringHunan University of Science and TechnologyXiangtan 411201China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Organic solar cells(OSCs)as a promising photovoltaic tech-nology have attracted great attention due to its unique advant-ages,such as solution processing,low cost,lightweight and ex-cellent mechanical flexibility[1−5]... 详细信息

关键词： polymer cost lightweight

Quantification of Central and Eastern China's atmospheric CH_(4) enhancement changes and its contributions based on machine learning approach

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Journal of Environmental Sciences 2024年第4期138卷 236-248页

作者： Xinyue Ai Cheng Hu Yanrong Yang Leying zhang Huili Liu Junqing zhang Xin Chen Guoqiang Bai Wei Xiao College of Biology and the Environment Joint Center for sustainable Forestry in Southern ChinaNanjing Forestry UniversityNanjing 210037China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD) Nanjing University of Information Science&TechnologyNanjing 210044China Guang’an Vocational&Technical College Guangan 638550China HuaNan Meteorological Administration Huanan 154400China

Methane is the second largest anthropogenic greenhouse gas,and changes in atmospheric methane concentrations can reflect the dynamic balance between its emissions and sinks.Therefore,the monitoring of CH_(4) concentration changes and the assessment of underlying driving factors can provide scientific basis for the government’s policy making and evaluation.China is the world’s largest emitter of anthropogenic methane.However,due to the lack of ground-based observation sites,little work has been done on the spatial-temporal variations for the past decades and influencing factors in China,especially for areas with high anthropogenic emissions as Central and Eastern China.Here to quantify atmospheric CH_(4) enhancements trends and its driving factors in Central and Eastern China,we combined the most up-to-date TROPOMI satellite-based column CH_(4)(xCH_(4))concentration from 2018 to 2022,anthropogenic and natural emissions,and a random forest-based machine learning approach,to simulate atmospheric xCH_(4) enhancements from 2001 to 2018.The results showed that(1)the random forest model was able to accurately establish the relationship between emission sources and xCH_(4) enhancement with a correlation coefficient(R^(2))of 0.89 and a root mean-square error(RMSE)of 11.98 ppb;(2)The xCH_(4) enhancement only increased from 48.21±2.02 ppb to 49.79±1.87 ppb from the year of 2001 to 2018,with a relative change of 3.27%±0.13%;(3)The simulation results showed that the energy activities and waste treatment were the main contributors to the increase in xCH_(4) enhancement,contributing 68.00% and 31.21%,respectively,and the decrease of animal ruminants contributed-6.70% of its enhancement trend.

关键词： TROPOMI Methane column concentrations Anthropogenic sources Random Forest model

Properties of polydimethylsiloxane hydrophobic modified duplex microarc oxidation/diamond-like carbon coatings on AZ31B Mg alloy

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Journal of Magnesium and Alloys 2021年第4期9卷 1291-1303页

作者： Xue-Jun Cui Chuang-Ming Ning Guang-An zhang Lun-Lin Shang Li-Ping Zhong Ying-Jun zhang School of Materials Science and Engineering Sichuan University of Science and EngineeringZigong 643000China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Key Laboratories of Fine Chemicals and Surfactants in Sichuan Provincial Universities Zigong 643000China

A reliable,high-performance coating procedure was developed using PDMS to modify a duplex MAO/DLC coating on an AZ31B Mg alloy.First,the duplex MAO/DLC coating was fabricated via a combined MAO and unbalanced magnetron sputter process.Subsequently,a PDMS solution was used to modify the MAO/DLC coating via a conventional dip-coating method.The surface characteristics,bond strength,hardness,tribological behaviour,and corrosion resistance of the coated samples were evaluated via SEM,CA,Raman spectroscopy,friction and wear behaviour,polarisation curve,and NSS tests.The PDMS modification reduced the HIT of MAO/DLC coating from 15.96 to 8.34GPa;this is ascribed to the penetration of PDMS,which has good rheological properties to form a viscoelastic Si-based organic polymer layer on the MAO/DLC coating.However,the PDMS-modified MAO/DLC coating was denser,hydrophobic,and had higher bond strength compared with MAO-and MAO/DLC-coated samples.Moreover,the PDMS modification reduced the COF and wear rate of the duplex MAO/DLC coating.This indicates that the PDMS improved the tribological behaviour owing to the transferred Si oxide that originated from the Si-O network of the PDMS,as well as the low graphitisation of the DLC layer during sliding.Furthermore,the corrosion current density of the MAO/DLC-coated sample modified by PDMS for 10min decreased by two order of magnitude compared with that of the MAO/DLC-coated sample but by five orders of magnitude compared with that of the bare substrate.The NSS tests proved that the PDMS layer slowed the corrosion of the Mg alloy under long-term service,enhancing the corrosion protection efficiency.The results are attributed to the high bond strength and lubricant MAO/DLC layer,and the dual role of sealing and hydrophobicity of PDMS.Therefore,PDMS modification is promising for the fabrication of protective materials for Mg alloys that require corrosion and wear resistance.

关键词： Magnesium alloy Microarc oxidation Diamond-like carbon Polydimethylsiloxane Tribological behaviour Corrosion resistance

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深部地质构造区冲击地压时空监测预警技术

中国矿业 2024年第1期33卷 147-154页

作者：韩正灿石翔元申银朋张晓雷陈海龙朱广安陕西郭家河煤业有限责任公司陕西宝鸡721500 西安科技大学能源学院陕西西安710054

针对郭家河煤矿1309工作面复杂地质构造开采条件,根据微震监测数据,分析工作面开采期间矿震频次、能量变化及震源时空演化特征,获取工作面开采期间冲击地压危险前兆信息;针对性提出了将矿震时空演化中长期动态预警与冲击变形能短临时空... 详细信息

针对郭家河煤矿1309工作面复杂地质构造开采条件,根据微震监测数据,分析工作面开采期间矿震频次、能量变化及震源时空演化特征,获取工作面开采期间冲击地压危险前兆信息;针对性提出了将矿震时空演化中长期动态预警与冲击变形能短临时空预警相结合的冲击地压监测预警方法:通过矿震时空演化指标对工作面冲击危险做出周期性动态评价,预测下一时段的强矿震及动力显现位置,并进行后续卸压效果检验;冲击变形能指数在时序上实时反映监测区冲击危险状态,并实时预测工作面动力显现与强矿震发生时间,提供及时的冲击危险预警信息,指导现场采取相应防治对策,实现对郭家河煤矿深部地质构造应力集中区冲击地压危险区域的动态探测与(半)定量预警。

关键词：构造应力集中冲击地压微震监测冲击变形能动态预警

中国清洁能源转型背景下的关键矿产形势及思考

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四川地质学报 2024年第2期44卷 241-251页

作者：孟广安李玉静韩明乐张粉霞崔彦生河北省地质矿产研究中心石家庄050051

从全球看,能源消费产生了当前主要的温室气体排放,推动能源部门实现净零排放是应对气候变化的关键抓手。在碳排放仍未达峰背景下,能源消费从传统化石能源向清洁能源转型被视为达到气候控制目标和实现可持续发展的关键措施之一。但人们... 详细信息

从全球看,能源消费产生了当前主要的温室气体排放,推动能源部门实现净零排放是应对气候变化的关键抓手。在碳排放仍未达峰背景下,能源消费从传统化石能源向清洁能源转型被视为达到气候控制目标和实现可持续发展的关键措施之一。但人们的目光主要集中在清洁能源及其技术本身,对其支撑保障要素,特别是关键矿产的保障关注不足。碳中和愿景下的气候雄心目标是驱动清洁能源转型和关键矿产消费的原动力。能源转型中的低碳能源使用、大量基础设施建设和设备制造、清洁能源开发使用技术等都对关键矿产资源提出了直接而巨大的需求。我国主要关键矿产的本底状态和资源储量,距离有效支撑和保障清洁能源成功转型,实现“双碳目标”,多数还有相当大的差距;新一代信息技术、高端装备制造等战略新兴产业的快速发展,更加剧了关键矿产资源支撑能源转型形势的严峻性。我国关键矿产资源支撑保障新时代清洁能源转型,需要采取以下解决方案:全面、完整、准确贯彻新发展理念,加快推进新一轮找矿突破战略行动,深化“一带一路”国家矿业国际合作,坚持绿色勘查开发和调整利用结构并重,创新驱动,提升矿产勘查开发利用水平,推动矿业全产业链管理和矿产品全生命周期管理。

关键词：清洁能源转型关键矿产形势思考