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friction and wear behavior of bioinspired composites with nacre-like lamellar and brick-and-mortar architectures against human enamel

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Journal of Materials Science & Technology 2022年第33期128卷 133-141页

作者： Kefeng Gao Jianjun Guan Hui Sun Chengwei Han Guoqi Tan Zengqian Liu Qiang Wang Zhefeng Zhang School of Mechanical Engineering Liaoning Petrochemical UniversityFushun 113001China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Liaoning Provincial Key Laboratory of Oral Diseases School and Hospital of StomatologyChina Medical UniversityShenyang 110001China Liaoning Upcera Co. Ltd.Benxi 117004China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

friction and wear performance is critical for dental materials which are inevitably subject to reciprocating friction against opposing teeth in applications.Here in-vitro friction and wear behavior of bioinspired ceramic-polymer composites,which possess nacre-like lamellar and brick-and-mortar architectures and resemble human teeth in their stiffness and hardness,against human tooth enamel were quantitatively investigated to imitate actual service conditions in line with standardized testing configuration.The composites were revealed to exhibit different wear mechanisms and lead to differing extents of wear to the opposing tooth enamel depending on their specific architectural types and orientations.In particular,the brick-and-mortar architecture displayed much less wear than the lamellar one,without obviously roughening the contact surfaces with enamel owing to its high ceramic content,and as such did not accelerate the wear of enamel as compared to smooth ceramics.Such characteristics,combined with its unique stiffness and hardness matching those of human enamel as well as the good fracture toughness and machinability,endow the composite with a promising potential for dental applications.This work may provide an experimental basis to this end and may also give insights towards designing new bioinspired wear-resistant materials for reducing friction and wear.

关键词： Bioinspired materials Nacre-like structures friction Wear mechanisms Orientation

friction of MoO_(3) Nanoflakes on Graphite Surface with an Ace-like Intercalation Layer

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Chemical Research in Chinese Universities 2022年第3期38卷 769-773页

作者： WEI Dawei ZHANG Guangjie LU Xiaoquan QIU Xiaohui Tianjin Key Laboratory of Molecular Optoelectronic Department of ChemistrySchool of ScienceTianjin UniversityTianjin300072P.R.China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing100190P.R.China Key Laboratory of Bioelectrochemistry&Environmental Analysis of Gansu Province College of Chemistry&Chemical EngineeringNorthwest Normal UniversityLanzhou730070P.R.China University of Chinese Academy of Sciences Beijing100049P.R.China

How water layer adsorbed on solid surface under ambient conditions affects the interfacial friction is a fundamental question for understanding the friction and lubrication phenomena in practical system.We investigate the formation of ice-like(IL)water layers on the hydrophobic surface of graphite with partially covered MoO_(3)nanoflakes(NFs)using atomic force microscopy(AFM)based techniques.The IL water layers are found surrounding the MoO_(3)NFs and also intercalated at the MoO_(3)/graphite interface,as proved by thickness measurements as well as local adhesion force and surface potential mappings.AFM manipulations carried out on MoO_(3)NFs on graphite show that the presence of the IL water layers increases the frictional resistance of the interface.Comparing the results on continuous and discontinuous IL water layers,we can identify the different sliding interfaces in the two scenarios.The increased friction for MoO_(3)NFs sliding on graphite with an intercalated water layer is attributed to the energy dissipation originated from the metastable nature of the IL layers.

关键词： friction Ice-like water MoO_(3) Graphite

friction and wear behavior of different seal materials under water-lubricated conditions

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friction 2021年第4期9卷 697-709页

作者： Weigang ZHAO Guoyuan ZHANG Guangneng DONG School of Astronautics Northwestern Polytechnical UniversityXi’an 710072China School of Mechano-Electronic Engineering Xidian UniversityXi'an 710071China Key Laboratory of Modern Design and Rotor-bearing System of Ministry of Education Xi’an Jiaotong UniversityXi’an 710049China

The shaft mechanical face seal in a high-speed turbopump of a liquid rocket engine often operates under extremely harsh conditions.For example,a low-temperature and low-viscosity fluid(such as liquid oxygen or liquid hydrogen)is used as a lubricant.The performance of the seal rings,especially the friction and wear behavior,directly determines whether the seal functions normal.In this study,the friction and wear behavior of several ring materials are tested using a pin-on-disk tribo-tester,and the wear morphology of the ring is investigated.The friction coefficients(COFs)and mass-wear rates under dry-friction and water-lubricated conditions,which are used to simulate low-viscosity conditions,are obtained.The results show that at a pressure-velocity(PV)value of 2.4 MPa-(m/s),the COF between the copper graphite(stator)and copper-chrome alloy disk(rotor)is low(with a value of 0.18)under the dry-friction conditions,and the 5-min wear mass of the copper graphite is approximately 2 mg.Under the water-lubricated conditions,compared with other materials(such as copper-chrome alloy,S07 steel,alumina ceramic coating,and nickel-based calcium fluoride),the S07 steel with a diamond-like carbon film is preferred for use in a high-speed turbopump under extreme conditions.The results of this study can provide theoretical and experimental guidance in the design of mechanical face seals in liquid rocket engines.

关键词： friction wear mechanical face seal water-lubricated high-speed turbopump

Cartilage-bone inspired the construction of soft-hard composite material with excellent interfacial binding performance and low friction for artificial joints

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friction 2023年第7期11卷 1177-1193页

作者： Qin CHEN Xinyue ZHANG Siyu LIU Kai CHEN Cunao FENG Xiaowei LI Jianwei QI Yong LUO Hongtao LIU Dekun ZHANG School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China School of Mechatronic Engineering China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Inspired by the cartilage-bone structure in natural joints,soft-hard integrated materials have received extensive attention,which are the most promising candidates for artificial joints due to their combination of excellent load-bearing properties and lubricating properties.The latest progress showed that the combination of hydrogel and titanium alloy can realize a bionic natural joint lubrication system on the surface of titanium alloy.However,obtaining a tough interface between the hydrogel(soft and wet)and the titanium substrate(hard and dry)is still a great challenge.Here,we designed a"soft(hydrogel)-hard(Ti6Al4V)"integrated material with outstanding combination,which simulates the structure and function of cartilage-bone in the natural joint.The load-bearing properties,binding performance,and tribological behaviors for different forms of the soft-hard integrated materials were investigated.The results showed that the hydrogel layer and Ti6Al4V substrate possess ultra-high interfacial toughness(3,900 J/m^(2)).In addition,the combination of the hydrogel layer and Ti6Al4V substrate provided a good lubrication system to endow the"soft(hydrogel)-hard(Ti6Al4V)"integrated material with high load-bearing and excellent tribological properties.Therefore,this study provided an effective strategy for prolonging the service life of Ti6Al4V in the biomedical field.

关键词： Ti6Al4V alloy hydrogel soft-hard interface friction

Deformation-and rupture-controlled friction between PDMS and a nanometer-scale SiO_(x) single-asperity

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friction 2023年第9期11卷 1755-1770页

作者： Arnaud CARON School of Energy Materials and Chemical EngineeringKoreaTech–Korea University of Technology and EducationCheonan 31253Republic of Korea

This work investigates the friction between polydimethylsiloxane(PDMS)and silicon oxide(SiO_(x))in single asperity sliding contact by atomic force microscopy(AFM).Two friction dependences on the normal force are identified:a tensile regime and a compressive regime of normal forces.In the compressive regime,friction is governed by the shear deformation and rupture of junctions between PDMS and SiO_(x).In this case,the shear strengthτ≈10 MPa is comparable with the cohesive strength of PDMS under compressive loading.In contrast,friction in the tensile regime is also affected by the elongation of the junctions.The single SiO_(x)-asperity follows a stick–slip motion on PDMS in both normal force regimes.Statistical analysis of stick–slip as a function of the normal force allows determining the necessary amount of energy to break a SiO_(x)/PDMS junction.friction between a SiO_(x)-asperity and a PDMS surface can be rationalized based on an energy criterion for the deformation and slippage of nanometer-scale junctions.

关键词： friction adhesion fracture atomic force microscopy(AFM) polydimethylsiloxane(PDMS)

Regulation and control of wet friction of soft materials using surface texturing:A review

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friction 2023年第3期11卷 333-353页

作者： Meng LI Wenbin SHI Jun SHI Tao WANG Liping SHI Xiaolei WANG Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Anhui University of TechnologyMa'anshan 243002China Anhui Province Key Laboratory of Special and Heay Load Robot Anhui University of TechnologyMa'anshan 243032China School of Mechanical Engineering Anhui University of TechnologyMa'anshan 243032China College of Mechanical&Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Surface texturing is a smart strategy that is commonly used in nature or industry to improve the tribological properties of sliding surfaces.Herein,we focus on the recent research progress pertaining to the wet friction modification of soft elastomers via texturing.To consider the pertinent physical mechanisms,we present and discuss the fundamentals of wet sliding on soft surfaces(including dewetting and wetting transitions in compliant contacts).Subsequently,we consider the methods in which the characteristic textures regulate and control wet sliding behaviors on soft surfaces;these textures range from conventional patterns of dimples to bioinspired architectures and can either positively or adversely impact the interfacial friction force.Furthermore,we briefly address the perspectives,potential applications,and challenges of texture design for modifying the friction characteristics of soft materials.

关键词： soft material surface texture wet sliding friction

考虑层间滑动摩擦的书状层合板的弯曲响应与耗能

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Acta Mechanica Sinica 2023年第3期39卷 64-71页

作者：孙博华党文刘轩廷郭晓琳 School of Civil Engineering&Institute of Mechanics and Technology Xi'an University of Architecture and TechnologyXi'an 710055China

为了有更好的保护,较强的硬度和较好的柔韧性,所有的生命和植都有皮组织,同样,所有的书也都有封皮.本文将层间摩擦视为扰动,研究具有层间滑动摩擦的精装书状层合板.对于准静态问题,针对三点支撑板弯曲响应和能量耗散进行了详细分析.我... 详细信息

为了有更好的保护,较强的硬度和较好的柔韧性,所有的生命和植都有皮组织,同样,所有的书也都有封皮.本文将层间摩擦视为扰动,研究具有层间滑动摩擦的精装书状层合板.对于准静态问题,针对三点支撑板弯曲响应和能量耗散进行了详细分析.我们的数值研究表明,就弯曲响应言,精装书的封皮比书芯层更重要;而对于耗能,摩擦导致在每个加载和载周期内产生很大的能量耗散.本研究的核心目标不仅是预测书本状板弯曲变形,而是用这一个代表性的案例,以期望找到有关具有层间滑动摩的多层结构的普遍行为.

关键词： Hardcover book Multilayer architecture Plates Bending friction Dissipation

A sulfonated modification of PEEK for ultralow friction

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friction 2023年第6期11卷 881-893页

作者： Shihua YUAN Chenhui ZHANG State Key Laboratory of Tribology Tsinghua UniversityBeijing100084China

Polyether ether ketone(PEEK)is a widely used material for friction pairs due to its excellent mechanical strength,good wear resistance,and chemical inertness.However,some modifications are necessary when PEEK is used as a water-lubricated friction pair.In this study,a novel sulfonation method was developed to design a water-lubricated friction pair with ultralow friction,good wear resistance,and high loading capacity.PEEK powders were sulfonated using ClSO3H and sintered to form bulk plastic.The sulfonated PEEK(SPEEK)plastic exhibited good tribological properties.At a low sliding speed,the friction coefficient was smaller than 0.02 when a 3 wt% NaCl solution was used as the lubricant.The order of magnitude of the wear rate was as low as 10^(-8) mm^(3)/(N·m).The mechanism of friction reduction was mainly hydration lubrication.The negatively charged -SO_(3)^(-) groups on the friction pair can adsorb hydrated Na+cations by electrostatic interactions.These hydrated Na+cations have a high load capacity and low shearing resistance.The ultralow wear mechanism observed in this study is possibly due to ultralow friction properties of the friction pairs prepared through the proposed sulfonation and thermoforming procedures.

关键词： polyether ether ketone(PEEK) sulfonation hydration lubrication friction wear

friction surfacing of AISI 316 over mild steel: A characteriation study

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Defence Technology（防务技术） 2018年第4期14卷 306-312页

作者： R.George Sahaya Nixon B.S.Mohanty R.Sathish Department of Mechanical Sathyabama University Department of Mechanical Engineering St.Joseph's College of Engineering Department of Mechanical Engineering SRM Easwari

An attempt has been made with overlaying of stain-less steel on mild steel by the technique of friction surfacing. This investigation elaborates the excellence acquired by different combination of the process parameters used in friction surfacing specifically traverse speed of the cross slide, speed of rotation of the spindle and the uniaxial compressive load. Excellent overlaying has been obtained amongst the chosen materials. To which, the coating can be done with various set of process parameters. It has been observed that the bond strength of the coating was found to be at a maximum of 502 MPa by ram tensile test.Based upon this results the surface methodology was characterized with scanning electron microscope.For authenticating the results, the coated specimen was subjected to salt spray test. The bonding microstructure was characterized using optical microscopy and X-ray diffraction. Corrosion resistance of surfaced coatings was found to be more inferior to that of mechtrode material and greater with the substrate.

关键词： friction surfacing Rotational speed Traverse speed Axial load Salt spray test Microstructure XRD analysis Ram tensile test