Article
Chemistry, Multidisciplinary
Victor E. P. Claerbout, Paolo Nicolini, Tomas Polcar
Summary: Solid lubricants, particularly molybdenum disulfide, have excellent frictional properties but are affected by humidity. This study used nonequilibrium molecular dynamics simulations to investigate the frictional properties of multilayer MoS2 sliding in water, revealing an energy-driven, rotational dependence of the water network and identifying three distinct frictional regimes based on water coverage. The results highlight the complex interactions between water and MoS2 in affecting friction behavior.
FRONTIERS IN CHEMISTRY
(2021)
Article
Engineering, Mechanical
Francisco A. Delfin, Sonia P. Bruhl
Summary: This paper investigates a multilayer CrN/DLC coating and its application on steel components. The results indicate that the coating can significantly reduce wear and friction coefficient, improving the lifespan and energy efficiency of steel components.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2022)
Article
Materials Science, Ceramics
Yanchao Zhao, Feng Xu, Dan Zhang, Ji Xu, Xianqing Shi, Shuo Sun, Wenxuan Zhao, Chengzuan Gao, Dunwen Zuo
Summary: The tribological and corrosion resistance properties of DLC/CrN multilayer films with different modulation ratios were investigated. The results showed that the film with a modulation ratio of 2:1 had the best wear resistance, while the film with a modulation ratio of 1:1 had the best corrosion performance.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Coatings & Films
Francisco A. Delfin, Sonia P. Bruhl, Ricardo C. Dommarco, Christian Forsich, Daniel Heim
Summary: Diamond-like carbon coatings produced with plasma-assisted CVD have excellent tribological behavior, making them suitable for reducing energy consumption and extending the lifespan of machine components made of low-alloy steels in mechanical engineering. This study investigated the deposition of soft a-C:H coatings on AISI 4140 steel, comparing Si-free and Si-doped coatings. The results showed that Si-doped coatings exhibited higher wear, while Si-free coatings had lower friction coefficient at a constant room temperature. The friction coefficient and wear volume increased with humidity for Si-free coatings, but the opposite trend was observed for Si-doped coatings, attributed to the oxidation of a-C:H and stability of silicon oxide film with varying humidity levels.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Physical
Li Li, Zhaoxia Lu, Jibin Pu, Baorong Hou
Summary: The tribological properties of MoS2 coating in high humidity environment can be improved by introducing reactive Zr, which changes the coating structure gradually and enhances the quality of the MoS2 transfer film.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Mechanical
Manuel Evaristo, Filipe Fernandes, Albano Cavaleiro
Summary: The tribological behavior of DLC coatings alloyed with different elements was evaluated. Pure DLC and DLC-W showed the best wear resistance, while DLCSi and DLCSiO demonstrated the lowest friction coefficient. The increase of temperature significantly increased the friction coefficient for DLC and DLC-W coatings, while a slight decrease was noticed for DLC-Ag, DLC-Si, and DLC-SiO coatings.
Article
Chemistry, Physical
Martin Vicen, Daniel Kajanek, Libor Trsko, Otakar Bokuvka, Martin Buchtik, Zuzana Florkova, Martin Frkan
Summary: In this study, a progressive type of tungsten-doped DLC coating was applied to a quenched and tempered 100Cr6 steel to improve its wear and corrosion properties in simulated seawater conditions and compare it to conventional DLC coating. Tungsten doping shifted the corrosion potential to a lower negative value, while conventional DLC exhibited a higher corrosion potential. The friction coefficient of the W-DLC coating was slightly higher in dry conditions but almost negligible in a saltwater environment compared to conventional DLC. The W-DLC layer also showed better integrity when exposed to wear and corrosion.
Article
Materials Science, Coatings & Films
A. Costa, F. Ferreira, J. L. Colaux, A. Vahidi, R. Serra, J. Oliveira
Summary: The automobile industry is working towards reducing emissions by improving the efficiency of internal combustion engines. One method being explored is the application of low friction carbon coatings on engine parts. This study found that depositing films with increasing hydrogen content resulted in improved mechanical and tribological properties, suggesting the potential benefits of higher hydrogen content as piston ring coatings to decrease friction losses.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Muhammad Usman, Zhifeng Zhou, Abdul Wasy Zia, Kwok Yan Li
Summary: The purpose of the study is to test high contact stress on thin coatings on a silicon wafer and obtain friction and wear data. The coating with a voltage of -120V has the highest hardness, modulus, and residual stress, as well as the lowest coefficient of friction and wear rate.
Article
Materials Science, Multidisciplinary
Chuang Wang, Can Xu, Zhiyu Wu, Feng Wen
Summary: The sp(3) ratio of the DLC film on NBR elastomer can be adjusted by changing the negative bias voltage applied to the substrate. The microstructure, composition, and tribological properties of the DLC films on NBR substrates were investigated. The DLC film on the NBR surface provides protection and reduces surface roughness. The content of sp(3) increases with an increase in the negative bias voltage. The viscoelasticity and roughness of the NBR substrate greatly affect the DLC film's adhesion strength and tribological behavior.
Review
Chemistry, Multidisciplinary
Jiaqi Liu, Tao Yang, Huatang Cao, Qiaoyuan Deng, Changjiang Pan, Feng Wen
Summary: The service conditions of rubber seals in dynamic sliding state with high friction coefficient can compromise the equipment's safety and lifespan. Diamond-like carbon (DLC) films have been widely used for tribological modification of rubber surfaces due to their excellent properties. However, the mismatch of mechanical properties often leads to the exfoliation of DLC films. Recent research has focused on enhancing the adhesion to increase the lifetime of coated rubber in friction. This article reviews the research achievements in structurization, adhesion, and doping, proposing an alternative direction for understanding the surface wear mechanism of wear-resistant DLC films on rubber.
NANOTECHNOLOGY REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Weifeng Zhang, He Hao, Yangjin Lee, Yan Zhao, Lianming Tong, Kwanpyo Kim, Nan Liu
Summary: This study successfully fabricated multilayer Moire superlattices with only one twisted interface and systematically studied their twist-angle dependent optical properties. The results showed that the twisted multilayers exhibited higher photoluminescence intensity and tunable interlayer coupling, indirect bandgap, and degree of circular polarization.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Wen Zhong, Haoyu Wang, Lei Ma, Changhua Zhang
Summary: The study investigated the wear properties of Cr/W-DLC/DLC multilayer films at different temperatures. The results showed that under no sand conditions, the primary mechanism of impact wear was plastic deformation, and the multilayer film exhibited excellent impact wear resistance. With the addition of sand particles, the impact wear mechanism changed to abrasive wear.
Article
Chemistry, Multidisciplinary
Dohyun Rhuy, Youjin Lee, Ji Yoon Kim, Chansoo Kim, Yongwoo Kwon, Daniel J. Preston, In Soo Kim, Teri W. Odom, Kibum Kang, Dongwook Lee, Won-Kyu Lee
Summary: This paper presents an approach to develop ultra-efficient catalysts for the hydrogen evolution reaction (HER) using low-cost, bulk multilayer MoS2. By transferring MoS2 flakes to gold thin films and inducing a local phase transition through surface wrinkles, the authors achieved HER activity comparable to platinum. The superior performance was attributed to the combined effect of the phase transition and improved charge transfer resistance through desulfurization.
Article
Materials Science, Multidisciplinary
Fatima Ezahra Annanouch, Aanchal Alagh, Polona Umek, Juan Casanova-Chafer, Carla Bittencourt, Eduard Llobet
Summary: By adjusting the gas flow rate, controlled growth of edge enriched 3D assemblies of MoS2 nanosheets was achieved, showcasing high sensitivity to NH3 and NO2 as well as low humidity cross-sensitivity.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Guizhi Wu, Qingchun Chen, Zhibin Lu, Guangan Zhang
RESULTS IN PHYSICS
(2019)
Article
Materials Science, Ceramics
Kun Liu, Lin Chen, Guangan Zhang, Guizhi Wu, Fei Ma, Zhibin Lu
CERAMICS INTERNATIONAL
(2019)
Article
Materials Science, Multidisciplinary
An Li, Qingchun Chen, Guizhi Wu, Yunfeng Wang, Zhibin Lu, Guangan Zhang
DIAMOND AND RELATED MATERIALS
(2020)
Article
Engineering, Mechanical
Jingjing Wang, Xia Li, Guizhi Wu, Zhibin Lu, Guangan Zhang, Qunji Xue
TRIBOLOGY INTERNATIONAL
(2019)
Article
Materials Science, Ceramics
Qingchun Chen, An Li, Guizhi Wu, Zhibin Lu, Guangan Zhang, Guangke Tian
CERAMICS INTERNATIONAL
(2020)
Article
Engineering, Chemical
Jian Wu, Guizhi Wu, Xinli Kou, Zhibin Lu, Guangan Zhang, Zhiguo Wu
Article
Materials Science, Multidisciplinary
An Li, Qingchun Chen, Guizhi Wu, Xin Huang, Yunfeng Wang, Zhibin Lu, Guangan Zhang, Xiangfan Nie
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2020)
Article
Materials Science, Multidisciplinary
Jian Wu, Lin Chen, Chuangming Ning, Guizhi Wu, Zhibin Lu, Lunlin Shang, Zhiguo Wu, Guangan Zhang
Summary: This study investigated the load-dependent tribological behaviors of chromium doped DLC films in different environments, revealing a decrease in friction coefficient with increasing load in hydrochloric acid, and the highest wear resistance at 5N. Wear mechanisms were identified as the formation of graphite-like transfer film and tribochemical products, as well as the superimposed effect of high contact stress and chloride ion corrosion.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Lin Chen, Chuangming Ning, Shunshun Qi, Guangan Zhang, Guizhi Wu, Zhibin Lu, Qunji Xue
Summary: This study investigates the friction properties of a-C films under methane atmosphere, revealing the significant influence of carbon target currents and thermal annealing on structures and tribological performances of a-C films. It also uncovers the roles of passivation and graphitization in enhancing wear resistance and reducing friction coefficients of a-C films in methane atmosphere.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Jian Wu, Lin Chen, Xubing Wei, Chuangming Ning, Guizhi Wu, Zhiguo Wu, Zhibin Lu, Guangan Zhang
Summary: The study focused on investigating the anti-corrosion and bio-tribological performance of taC composite on Ti6Al4V substrates. The results showed that the designed taC composite enhanced wear resistance and exhibited excellent anti-corrosion properties. This composite material could have potential applications in biomedical implants.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Engineering, Chemical
Yunfeng Wang, Yongjun Li, Guizhi Wu, Zhibin Lu
Summary: This study developed a solid-liquid lubricating system by combining TiN film with graphene aqueous dispersion to achieve low friction under macroscopic contact. The results showed that the friction coefficient of the TiN film decreased when adding graphene aqueous dispersion, and the reduction varied with the concentration of graphene.
LUBRICATION SCIENCE
(2022)
Article
Materials Science, Coatings & Films
Guizhi Wu, Yongjun Li, Rob Brittain, Zhibin Lu, Liuquan Yang
Summary: This study investigates the adhesion property of a model TiN film on a stainless steel substrate through scratch tests. In addition to cracks and ploughing wear, microscopic deformations and fracture mechanisms are observed. The spallation failure at the edge of the scratch track, assigned as critical load (Lc2) with adhesive failure characteristics, is actually cohesive failure. The Lc3 site corresponds to cohesive failure in the substrate. Therefore, evaluating the adhesion of a film should consider the entire film/substrate system rather than solely analyzing the film surface.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Qingchun Chen, An Li, Guizhi Wu, Yuan Wang
Summary: With the rapid development of aerospace technology, the use of solid lubricant coatings has become essential for improved performance and stable operation of moving parts under extreme conditions. While molybdenum disulfide (MoS2) and diamond-like carbon (DLC) films have low coefficients of friction, they fail in vacuum due to assembly challenges in atmospheric environments. Surprisingly, conventional nitride films showed unexpected results, with a relatively stable friction coefficient for TiN/SiC friction pair in vacuum and TiN/WC friction pair under N2 atmosphere. These findings provide insight into the friction mechanism and potential engineering applications of TiN films with advanced ceramic materials.
CERAMICS INTERNATIONAL
(2023)
Article
Environmental Sciences
Boyin Yan, Chunyu Han, Zhiquan Liu, Guizhi Wu, Songxue Wang, Jincheng Li, Wenxiang Xia, Fuyi Cui
Summary: This study systematically investigated the effectiveness of BMAA degradation by ozone and found that in pure water, the removal rate of BMAA was almost 100%, but it was lower in actual water. BMAA was primarily degraded by direct oxidation of ozone molecules under acidic and near-neutral conditions, while indirect oxidation of hydroxyl radicals accounted for the main part under strong alkaline conditions. The pH value had a significant effect on the degradation of BMAA, with the fastest degradation rate at near-neutral pH. By-products were generated during the degradation process, and three by-products were identified. The degradation pathways of BMAA were proposed to be attributed to the fracture of C-N bonds.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Na Zhang, Liwei Lin, Bo Liu, Guizhi Wu, Wei Xu, Tao Peng
DIAMOND AND RELATED MATERIALS
(2020)
