检索结果-南通市图书馆

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

引用

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 mechanisms.Data-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 correlate.Correlation 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 data.Results demonstrated that ML models could satisfactorily predict friction coefficient and wear rate from the material properties and testing method variables data.Herein,the LSBoost model based on the integrated learning algorithm presented the best prediction performance for friction coefficients and wear rates,with R2 of 0.9219 and 0.9243,respectively.Feature 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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

引用

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 ceramics.Inspired 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 investigated.The 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 architecture.The maximum crack growth toughness was extremely high(approximately 21 MPa×m^(1/2)),corresponding to a 270%increase over the crack initiation toughness.Excellent 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)produced.As a result,a synergistic improvement of mechanical and tribological properties at high temperature(1000℃)was realized by combining bionic structure and tribological design.It 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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Low-temperature and flexible strategy to in-situ fabricate ZrSiO_(4)-based ceramic composites via doping and tuning solid-state reaction

引用

Journal of Advanced Ceramics 2023年第6期12卷 1238-1257页

作者： Bohan Wang Le Fu junjie song Wenjun Yu Ying Deng Guofu Xu Jiwu Huang Wei Xia School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 264006China Applied Materials Science Department of Materials Science and EngineeringUppsala UniversityUppsala 75121Sweden

Synthetic zircon(ZrSiO_(4))ceramics are typically fabricated at elevated temperatures(over 1500℃),which would lead to high manufacturing cost.Meanwhile,reports about preparing ZrSiO_(4)-based ceramic composites via controlling the solid-state reaction between zirconia(ZrO_(2))and silica(SiO_(2))are limited.In this work,we proposed a low-temperature strategy to flexibly design and fabricate ZrSiO_(4)-based ceramic composites via doping and tuning the solid-state reaction.Two ceramic composites and ZrSiO_(4) ceramics were in-situ prepared by reactive fast hot pressing(FHP)at approximately 1250℃ based on the proposed strategy,i.e.,a ZrSiO_(4)-SiO_(2) dual-phase composite with bicontinuous interpenetrating and hierarchical microstructures,a ZrSiO_(4)-ZrO_(2) dual-phase composite with a microstructure of ZrO_(2) submicron-and nano-particles embedded in a micron ZrSiO_(4) matrix,and ZrSiO_(4) ceramics with a small amount of residual ZrO_(2) nanoparticles.The results showed that the phase compositions,microstructure configurations,mechanical properties,and wear resistance of the materials can be flexibly regulated by the proposed strategy.Hence,ZrSiO_(4)-based ceramic composites with different properties can be easily fabricated based on different application scenarios.These findings would offer useful guidance for researchers to flexibly fabricate ZrSiO_(4)-based ceramic composites at low temperatures and tailor their microstructures and properties through doping and tuning the solid-state reaction.

关键词： zirconia(ZrO_(2))-silica(SiO_(2)) zircon(ZrSiO_(4)) solid-state reaction ceramic composite mechanical properties wear resistance

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

引用

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 material.Due 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 composites.In 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 investigated.Results 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 particles.The 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 fractures.Meanwhile,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 properties.The 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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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 display.Due to high melting points and low lattice diffusion coefficients,however,the high-entropy carbides are usually difficult to consolidate to a nearly full density.To 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 investigated.Intriguingly,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 wear.At 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 reactions.These 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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于离差最大化-灰色关联的修补混凝土配合比评价

引用

材料导报 2024年第6期38卷 125-131页

作者：杨淑雁徐盼盼宋俊杰陈小龙宁夏大学土木与水利工程学院银川750021

针对西北地区损伤混凝土的复杂服役环境,采用硅粉取代率、水玻璃取代率、玄武岩纤维掺量以及UEA膨胀剂取代率为考察因素进行修补混凝土正交试验方案设计。基于流动性、力学性能和体积稳定性这三个评价性能,按照重要性排序引入了12个具... 详细信息

针对西北地区损伤混凝土的复杂服役环境,采用硅粉取代率、水玻璃取代率、玄武岩纤维掺量以及UEA膨胀剂取代率为考察因素进行修补混凝土正交试验方案设计。基于流动性、力学性能和体积稳定性这三个评价性能,按照重要性排序引入了12个具体试验指标(即3 d、7 d和28 d抗压强度,1 d、3 d、7 d、14 d、28 d、45 d、60 d和90 d膨胀率以及塌落度),进行测试。对于试验结果,建立了离差最大化-灰色关联体系进行修补混凝土配合比综合评价,优选出了一种流动性好、早期强度高且后期强度发展好的微膨胀修补混凝土配合比X4(A_(2)B_(1)C_(2)D_(3))。此外,该综合评价体系能够科学、合理地反映评价者对指标重要性的主观意见与实际试验的客观性,可用于多因素、多动态指标下混凝土配合比的优选与综合评价。

关键词：离差最大化灰色关联修补混凝土配合比评价

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Complicated deformation simulating on temperature-driven 4D printed bilayer structures based on reduced bilayer plate model

引用

Applied Mathematics and Mechanics(English Edition) 2021年第11期42卷 1619-1632页

作者： junjie song Yixiong FENG Yong WANG Siyuan ZENG Zhaoxi HONG Hao QIU Jianrong TAN State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China Engineering Research Center for Design Engineering and Digital Twin of Zhejiang Province Zhejiang UniversityHangzhou 310027China

The four-dimensional(4D) printing technology, as a combination of additive manufacturing and smart materials, has attracted increasing research interest in recent years. The bilayer structures printed with smart materials using this technology can realize complicated deformation under some special stimuli due to the material properties.The deformation prediction of bilayer structures can make the design process more rapid and thus is of great importance. However, the previous works on deformation prediction of bilayer structures rarely study the complicated deformations or the influence of the printing process on deformation. Thus, this paper proposes a new method to predict the complicated deformations of temperature-sensitive 4D printed bilayer structures,in particular to the bilayer structures based on temperature-driven shape-memory polymers(SMPs) and fabricated using the fused deposition modeling(FDM) technology. The programming process to the material during printing is revealed and considered in the simulation model. Simulation results are compared with experiments to verify the validity of the method. The advantages of this method are stable convergence and high efficiency,as the three-dimensional(3D) problem is converted to a two-dimensional(2D) problem.The simulation parameters in the model can be further associated with the printing parameters, which shows good application prospect in 4D printed bilayer structure design.

关键词： reduced bilayer plate model four-dimensional(4D)printing temperature-driven shape-memory polymer(SMP) bilayer structure complicated deformation simulating

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于自监督视觉Transformer的图像美学质量评价方法

引用

计算机应用 2024年第4期44卷 1269-1276页

作者：黄荣宋俊杰周树波刘浩东华大学信息科学与技术学院上海201620 数字化纺织服装技术教育部工程研究中心(东华大学) 上海201620

现有的图像美学质量评价方法普遍使用卷积神经网络(CNN)提取图像特征,但受局部感受野机制的限制,CNN较难提取图像的全局特征,导致全局构图关系、全局色彩搭配等美学属性缺失。为解决该问题,提出基于自监督视觉Transformer(SSViT)模型的... 详细信息

现有的图像美学质量评价方法普遍使用卷积神经网络(CNN)提取图像特征,但受局部感受野机制的限制,CNN较难提取图像的全局特征,导致全局构图关系、全局色彩搭配等美学属性缺失。为解决该问题,提出基于自监督视觉Transformer(SSViT)模型的图像美学质量评价方法。利用自注意力机制建立图像局部块之间的长距离依赖关系,自适应地学习图像不同局部块之间的相关性,提取图像的全局特征,从而刻画图像的美学属性;同时,设计图像降质分类、图像美学质量排序和图像语义重构这3项美学质量感知任务,利用无标注的图像数据对视觉Transformer(ViT)进行自监督预训练,增强全局特征的表达能力。在AVA(Aesthetic Visual Assessment)数据集上的实验结果显示,SSViT模型在美学质量分类准确率、皮尔森线性相关系数(PLCC)和斯皮尔曼等级相关系数(SRCC)指标上分别达到83.28%、0.7634和0.7462。以上实验结果表明,SSViT模型具有较高的图像美学质量评价准确性。

关键词：图像美学质量评价视觉Transformer 自监督学习全局特征自注意力机制

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

织构化钛合金表面MoS_(2)薄膜的制备及其微动摩擦学性能研究

引用

摩擦学学报（中英文） 2024年第6期44卷 842-853页

作者：赵乾程曹文辉宋俊杰胡天昌贾小斌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甘肃兰州730000 中国科学院大学材料与光电研究中心北京100049 兰州兰石重型装备股份有限公司甘肃兰州730314

钛合金作为1种性能优异的轻金属结构材料,其较差的耐磨性限制了钛合金在摩擦学领域的应用.本文中通过将表面织构化与固体润滑薄膜相结合在钛合金表面制备了MoS_(2)复合润滑薄膜,考察了织构参数以及摩擦对偶材料对其微动摩擦学行为的影响... 详细信息

钛合金作为1种性能优异的轻金属结构材料,其较差的耐磨性限制了钛合金在摩擦学领域的应用.本文中通过将表面织构化与固体润滑薄膜相结合在钛合金表面制备了MoS_(2)复合润滑薄膜,考察了织构参数以及摩擦对偶材料对其微动摩擦学行为的影响.研究表明:当摩擦对偶为GCr15球时,表面织构化与固体润滑剂相结合能显著减小材料的磨损和延长润滑寿命,织构密度为20%的样品表面容易形成转移膜,润滑寿命最长.而当摩擦对偶为TC4球时,在相同测试条件下,表面复合结构的抗磨寿命远低于摩擦对偶为GCr15球时的寿命.摩擦对偶材料影响着复合润滑结构的润滑寿命,表面织构能够起到补充固体润滑剂和捕获磨屑的作用,从而达到抗磨减摩的目的,同时适宜的织构密度能明显延长复合润滑结构的微动寿命.

关键词：钛合金表面织构 MoS_(2)润滑微动摩擦对偶

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

还原菌Staphylococcus sp.修复六价铬污染土壤的中试研究

引用

安全与环境学报 2024年第4期24卷 1581-1586页

作者：宋骏杰许奕敏李伟平谢荣焕刘桂建安徽国祯环境修复股份有限公司合肥230088 中国科学技术大学地球和空间科学学院合肥230026 合肥市土壤及地下水修复工程技术研究中心合肥230088

为探索微生物修复的工程化应用前景,开展六价铬污染土壤的微生物还原修复中试研究。通过采集废弃电镀厂场地污染土壤,筛选出1株具有六价铬还原作用的功能菌Staphylococcus sp.。Staphylococcus sp.对六价铬的耐受质量浓度高于200 mg/L,... 详细信息

为探索微生物修复的工程化应用前景,开展六价铬污染土壤的微生物还原修复中试研究。通过采集废弃电镀厂场地污染土壤,筛选出1株具有六价铬还原作用的功能菌Staphylococcus sp.。Staphylococcus sp.对六价铬的耐受质量浓度高于200 mg/L,最适pH值为7,适宜温度为25~35℃。研究发现,当土壤六价铬初始质量比为98.00 mg/kg、水土比(mL∶g)为2∶1、添加肉膏蛋白胨(Luria-Bertani,LB)培养基的条件下,Staphylococcus sp.能在21 d内将六价铬全部还原。在污染土壤的微生物治理中试研究中,污染土壤的用量为200 kg,水土比(mL∶g)为2∶1,且周期性地添加LB培养基。土壤中六价铬初始质量比为65.42 mg/kg,Staphylococcus sp.在6 d内对六价铬的还原率达到92.59%,后续24 d土壤中六价铬质量比在2.97~10.85 mg/kg呈现波动状态。结果表明,污染场地筛选出的土著功能菌Staphylococcus sp.具有潜在的工程应用价值。中试研究确定的相关参数能为后期工程化应用提供技术支撑。

关键词：环境工程学还原菌六价铬土壤修复中试研究

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：