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Modeling and prediction of tribological properties of copper/aluminum-graphite self-lubricating composites using machine learning algorithms

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Friction 2024年第6期12卷 1322-1340页

作者： Huifeng NING Faqiang CHEN yunfeng su Hongbin LI Hengzhong FAN Junjie SONG Yongsheng ZHANG Litian HU School of Electrical and Mechanical Engineering Lanzhou University of TechnologyLanzhou 730050China 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

The tribological properties of self-lubricating composites are influenced by many variables and complex ***-driven methods,including machine learning(ML)algorithms,can yield a better comprehensive understanding of complex problems under the influence of multiple parameters,typically for how tribological performances and material properties *** of friction coefficients and wear rates of copper/aluminum-graphite(Cu/Al-graphite)self-lubricating composites with their inherent material properties(composition,lubricant content,particle size,processing process,and interfacial bonding strength)and the variables related to the testing method(normal load,sliding speed,and sliding distance)were analyzed using traditional approaches,followed by modeling and prediction of tribological properties through five different ML algorithms,namely support vector machine(SVM),K-Nearest neighbor(KNN),random forest(RF),eXtreme gradient boosting(XGBoost),and least-squares boosting(LSBoost),based on the tribology experimental *** demonstrated that ML models could satisfactorily predict friction coefficient and wear rate from the material properties and testing method variables ***,the LSBoost model based on the integrated learning algorithm presented the best prediction performance for friction coefficients and wear rates,with R^(2) of 0.9219 and 0.9243,*** importance analysis also revealed that the content of graphite and the hardness of the matrix have the greatest influence on the friction coefficients,and the normal load,the content of graphite,and the hardness of the matrix influence the wear rates the most.

关键词： self-lubricating composites machine learning(ML) tribological properties prediction

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高紫外反射率雪地型多频谱伪装面料研发

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针织工业 2024年第7期 47-52页

作者：曹文娜方娟娟顾浩苏云峰中国纺织信息中心北京100027 苏州涂博丝绸整理科技有限公司江苏苏州215228

伪装网是用于遮盖武器装备或目标,以达到低可探测性的隐身器材。文中阐述了高紫外反射双面多频谱雪地型伪装网,并从颜料、吸波材料和树脂的选择,涂层工艺,产品检测结果等方面进行研发与生产控制,以成功研制出符合标准的一款高紫外反射... 详细信息

伪装网是用于遮盖武器装备或目标,以达到低可探测性的隐身器材。文中阐述了高紫外反射双面多频谱雪地型伪装网,并从颜料、吸波材料和树脂的选择,涂层工艺,产品检测结果等方面进行研发与生产控制,以成功研制出符合标准的一款高紫外反射率雪地型多频谱伪装网用面料。并指出高紫外反射率雪地型多频谱伪装网用面料提升了装备伪装的隐蔽效果,提高了产品附加值和市场竞争力。

关键词：高紫外反射率雪地型多频谱伪装面料隐蔽效果

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Bioinspired PcBN/hBN fibrous monolithic ceramic:High-temperature crack resistance responses and self-lubricating performances

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Journal of Advanced Ceramics 2022年第9期11卷 1391-1403页

作者： Shu-na CHEN Hengzhong FAN yunfeng su Jicheng LI Junjie SONG Litian HU Yongsheng 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

The high strength and toughness of natural materials are mainly determined by a combination of mechanisms operating at different length scales,which can be used as a strategy to reduce the intrinsic brittleness of *** by the architectures of bamboo,the polycrystalline cubic boron nitride/hexagonal boron nitride(PcBN/hBN)fibrous monolithic ceramics with a long fiber arrangement structure was constructed with PcBN fiber cells and hBN cell boundaries,and its crack resistance responses and tribological performances were *** composite ceramic failed in a non-brittle manner with the rising resistance curve(R-curve)behavior,which was attributed to multiscale crack effects in the hierarchical *** maximum crack growth toughness was extremely high(approximately 21 MPa×m^(1/2)),corresponding to a 270%increase over the crack initiation *** fracture resistance could be retained even above 1000℃.Moreover,the composite ceramic exhibited low and stable friction coefficients(approximately 0.33)when paired with a Si_(3)N_(4)pin at high temperature(1000℃),owing to the lubrication function of hBN cell boundaries with weak van der Waals forces and a small amount of liquid B_(2)O_(3)*** a result,a synergistic improvement of mechanical and tribological properties at high temperature(1000℃)was realized by combining bionic structure and tribological *** provides important theoretical and technical support for expanding the application of self-lubricating composite ceramics in harsh environments.

关键词： self-lubricating composite ceramic bioinspired structure resistance curve(R-curve) high-temperature property friction and wear

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Influence of binder systems on sintering characteristics, microstructures, and mechanical properties of PcBN composites fabricated by SPS

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Journal of Advanced Ceramics 2022年第2期11卷 321-330页

作者： Shuna CHEN Hengzhong FAN yunfeng su Wensheng LI Jicheng LI Bing YAN Junjie SONG Litian HU Yongsheng 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 School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China

Cubic boron nitride(cBN)with high hardness,thermal conductivity,wear resistance,and chemical inertness has become the most promising abrasive and machining *** to the difficulty of fabricating pure cBN body,generally,some binders are incorporated among cBN particles to prepare polycrystalline cubic boron nitride(PcBN).Hence,the binders play a critical factor to the performances of PcBN *** this study,the PcBN composites with three binder systems containing ceramic and metal phases were fabricated by spark plasma sintering(SPS)from 1400 to 1700℃.The sintering behaviors and mechanical properties of the composites were *** show that the effect of binder formulas on mechanical properties mainly related to the compactness,mechanical performances,and thermal expansion coefficient of binder phases,which affect the carrying capacity of the composites and the bonding strength between binder phases and cBN *** PcBN composite with SiAlON phase as binder presented optimal flexural strength(465±29 MPa)and fracture toughness(5.62±0.37 MPa·m^(1/2)),attributing to the synergistic effect similar to transgranular and intergranular ***,the excellent mechanical properties can be maintained a comparable level when the temperature even rises to 800℃.Due to the weak bonding strength and high porosity,the PcBN composites with Al_(2)O_(3)–ZrO_(2)(3Y)and Al–Ti binder systems exhibited inferior mechanical *** possible mechanisms to explain these results were also analyzed.

关键词： polycrystalline cubic boron nitride(PcBN) binder system sintering characteristic high temperature mechanical property fracture mechanism

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Synthesis and mechanical and elevated temperature tribological properties of a novel high-entropy(TiVNbMoW)C_(4.375) with carbon stoichiometry deviation

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Journal of Advanced Ceramics 2023年第2期12卷 242-257页

作者： Jicheng LI Yanchun ZHOU yunfeng su Shuna CHEN Qiuan suN Hengzhong FAN Junjie SONG Litian HU Yongsheng 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 Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China

High-entropy carbides are a nascent group of ceramics that are promising for high-temperature applications due to the combination of good stability,high hardness(H),high strength,and superior creep resistance that they *** to high melting points and low lattice diffusion coefficients,however,the high-entropy carbides are usually difficult to consolidate to a nearly full *** cope with this challenge,herein,binary carbides including TiC,V_(8)C_(7),NbC,Mo_(2)C,and WC with different carbon stoichiometry were used to prepare dense high-entropy(TiVNbMoW)C_(4.375),and the influence of carbon vacancy on formation ability and mechanical properties of carbon-deficient high-entropy(TiVNbMoW)C_(4.375) were ***,although the starting binary carbides have different crystal structures and carbon stoichiometry,the as-prepared high-entropy material showed a rock-salt structure with a relatively high density(98.1%)and good mechanical properties with hardness of 19.4±0.4 GPa and fracture toughness(KIC)of 4.02 MPa·m^(1/2).More importantly,the high-entropy(TiVNbMoW)C_(4.375) exhibited low coefficient of friction(COF)at room temperature(RT)and 800℃.Wear rate(W)gradually increased with the temperature rising,which were attributed to the formation of low-hardness oxidation films at high temperatures to aggravate *** 800℃,lubricating films formed from sufficient oxidation products of V_(2)O_(5) and MoO_(3) effectively improved tribological behavior of the high-entropy(TiVNbMoW)C_(4.375).Wear mechanisms were mainly abrasive wear resulting from grain pullout and brittle fracture as well as oxidation wear generated from high-temperature *** results are useful as valuable guidance and reference to the synthesis of high-entropy ceramics(HECs)for sliding parts under high-temperature serving conditions.

关键词： high-entropy ceramics(HECs) transition metal(TM)carbides carbon stoichiometry deviation tribological performances wear

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蚕沙提取物在盐溶液中的阻垢缓蚀性能研究

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工业水处理 2024年第7期44卷 105-112页

作者：柳鑫华石春杰张源王瀛罗宝晶付占达舒世立苏云凤刘帅王伊然唐山师范学院化学系河北唐山063000 唐山市绿色专用化学品重点实验室河北唐山063000

大多数合成缓蚀阻垢剂对环境的有害影响是研究环保型提取物的动机。采用红外光谱(FTIR)和紫外可见光谱(UV-vis)研究了蚕沙提取物(SSE)的主要成分;采用电导率、静态阻垢法,结合扫描电镜(SEM),研究了SSE作为阻垢剂在氯化钙盐溶液中的阻垢... 详细信息

大多数合成缓蚀阻垢剂对环境的有害影响是研究环保型提取物的动机。采用红外光谱(FTIR)和紫外可见光谱(UV-vis)研究了蚕沙提取物(SSE)的主要成分;采用电导率、静态阻垢法,结合扫描电镜(SEM),研究了SSE作为阻垢剂在氯化钙盐溶液中的阻垢效果;采用电化学阻抗技术(EIS)和动电位极化曲线(PDP)研究其在模拟冷却水中的缓蚀性能。结果表明:SSE的主要成分为叶绿素;当SSE质量浓度达到30 mg/L以上时,对碳酸钙、硫酸钙的阻垢率都在90%以上,SSE可以抑制碳酸钙的过饱和,延长成核时间,并会使钙垢的晶型发生变化;SSE在盐溶液中对Q235钢具有良好的缓蚀效果,其缓蚀机理为SSE在Q235钢表面形成一层保护膜。SSE能起到阻垢、缓蚀双重作用,是一种潜在的新型、环境安全的缓蚀阻垢剂,适用于冷却水系统。

关键词：蚕沙提取物阻垢缓蚀剂盐溶液阻垢缓蚀机理

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Improving antioxidant activities of water-soluble lignin-carbohydrate complex isolated from wheat stalk through prolonging ball-milling pretreatment and homogeneous extraction

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Journal of Bioresources and Bioproducts 2024年第1期9卷 113-125页

作者： Di Xie Zhulan Liu yunfeng Cao Sheng-I Yang Chen su Mi Li Jiangsu Co-innovation Center for Efficient Processing and Utilization of Forest Products Nanjing Forestry UniversityNanjing 210037China International Innovation Center for Forest Chemicals and Materials Nanjing Forestry UniversityNanjing 210037China Center for Renewable Carbon School of Natural ResourcesUniversity of TennesseeKnoxvilleTN 37996USA Shandong Huatai Paper Co. Ltd.Dongying 257000China School of Natural Resources University of TennesseeKnoxvilleTN 37996USA Key Lab of Biomass Energy and Material Institute of Chemical Industry of Forest ProductsChinese Academy of ForestryJiangsu ProvinceNanjing 210042China

Water-soluble lignin-carbohydrate complex(LCC)rich in polysaccharides exhibits benign in vitro antioxidant activities and distinguishes high biocompatibility from lignin-rich LCC and ***,the antioxidant activity of water-soluble LCCs remains to be improved and its structure-antioxidant relationship is still ***,structurally diversified water-soluble LCCs were isolated under different ball-milling pretreatment durations(4,6,8 h),extraction pathways(ho-mogeneous and heterogeneous),and isolation routines(water extracts and residues after water extraction).Their structures were characterized by wet chemistry,chromatography and *** activities were evaluated by ferric reducing antioxidant power and 1,1-diphenyl-2-picrylhydrazyl radicals scavenging rate(RDPPH).Results show that altering ball-milling duration and isolation procedures cause varied structures and antioxidant activities of the water-soluble ***,prolonging ball-milling duration to 8 hours and homogeneous extrac-tion can enhance their antioxidant activity through releasing more phenolic structures and pro-moting the extraction of high-molecular-weight LCCs via reducing mass-transfer resistance,*** a result,the RDPPH of water-soluble LCCs reaches up to 97.35%,which is associated with the arabinan content with statistical significance(P<0.05).This study provides new insights into the structure-antioxidation relationship of herbaceous LCC as potential antioxidants.

关键词： LCC Homogeneous extraction Ball-milling Structure-antioxidation relationship Wheat straw

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改进的TOPSIS方法在物流配送中心选址中的应用研究

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物流技术 2014年第5期33卷 193-195页

作者：苏云峰武汉铁路职业技术学院湖北武汉430205

鉴于物流配送中心选址方案评价属于多属性决策问题,建立由5个一级指标及19个二级指标组成的评价模型。在对模型的求解过程中,为避免传统的TOPSIS方法产生逆序问题,将改进的TOPSIS方法引入到多属性决策问题中,用AHM方法计算指标权重,根... 详细信息

鉴于物流配送中心选址方案评价属于多属性决策问题,建立由5个一级指标及19个二级指标组成的评价模型。在对模型的求解过程中,为避免传统的TOPSIS方法产生逆序问题,将改进的TOPSIS方法引入到多属性决策问题中,用AHM方法计算指标权重,根据综合评价指数对方案进行排序,为决策物流配送中心选址提供科学依据。

关键词：配送中心 TOPSIS AHM 选址

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氧化锆基梯度功能材料的设计、制备与性能优化

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硅酸盐学报 2016年第12期44卷 1729-1735页

作者：方媛苏云峰张永胜胡丽天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 中国科学院大学北京100049

以石墨为单相润滑剂,设计、制备了梯度层热膨胀系数呈连续变化的氧化锆基功能梯度材料,研究了结构参数与梯度材料力学性能的关系。结果表明:通过调节石墨在复合材料中的空间分布特征,可实现对材料内残余应力大小的调节,进而实现材料力... 详细信息

以石墨为单相润滑剂,设计、制备了梯度层热膨胀系数呈连续变化的氧化锆基功能梯度材料,研究了结构参数与梯度材料力学性能的关系。结果表明:通过调节石墨在复合材料中的空间分布特征,可实现对材料内残余应力大小的调节,进而实现材料力学性能的优化。增大梯度层数和承载层厚度均有利于梯度材料力学性能的提高。梯度指数p为2.5时,材料具有最佳的抗弯强度,抗弯强度可达750 MPa。材料的梯度结构设计实现了陶瓷复合材料的结构/润滑功能一体化。

关键词：氧化锆石墨功能梯度材料力学性能热膨胀

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大数据在高中生物实验教学中的应用

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实验技术与管理 2017年第8期34卷 162-164页

作者：杨桂兰苏云凤哈尔滨师范大学教育部高校辅导员培训与研修基地黑龙江哈尔滨150025 哈尔滨师范大学教师教育学院黑龙江哈尔滨150025

大数据在教育领域受到广泛关注,但在高中实验教学方面的研究还有待深入。以高中生物学科为例,阐述了传统实验教学的现状,从实验设计、实验组织、结果分析与评价3个方面分析了大数据在生物实验教学上的应用,为生物实验教学的优化提供了... 详细信息

大数据在教育领域受到广泛关注,但在高中实验教学方面的研究还有待深入。以高中生物学科为例,阐述了传统实验教学的现状,从实验设计、实验组织、结果分析与评价3个方面分析了大数据在生物实验教学上的应用,为生物实验教学的优化提供了新的思维和方法。

关键词：大数据实验教学高中生物

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