LANGMUIR
·
2024
·
IF 3.7
Bin Wang,Kai Gao,Kai Wang,Yujie Wang,Qiuying Chang,He Yang
The tribological behavior of carboxylic acids, especially oleic acid, in boundary lubrication conditions is a subject of interest. This study presents the results of four-ball tribological tests conducted under varying contact pressures and sliding speeds. The findings reveal a critical turning speed within a confined zone, which causes a significant change in the frictional performances of oleic acid, leading to the formation of an ultralow wear tribofilm. This tribofilm, predominantly composed of oxyhydrogen compounds and hydrocarbons with more than five carbon atoms, is generated by the molecular action of oleic acid. Reactive nonequilibrium molecular dynamics simulations demonstrate that the shear speed-dependent decomposition modes of oleic acid and the transformation of the lubrication slip interface are the fundamental processes underlying the formation of this ultralow-wear boundary tribofilm.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Ao Xie,Jiaying Zhang,Hao-Zhe Xu,Xin-Gang Wang,Qiangliang Yu,Wenquan Lv,Meirong Cai,Feng Zhou
This manuscript developed a novel DLC–supramolecular gel (HTG) composite lubrication system to achieve long-life outstanding lubrication under extreme contact stress while avoiding sealing challenges relying on the unique thixotropic properties of the gel. DLC–HTG exhibited ultra-low wear and excellent friction reduction performance under a maximum contact stress of 2.24 GPa. DLC films with designed double transition layers possess high interfacial bond strength and mechanical properties, providing the basis for high wear resistance. The establishment of a robust tribofilm and the confinment effect of HTG on wear debris dominate the achievement of ultra-low wear. This ultra-low wear sliding extends the service life of the lubrication system with the broad implications for mechanical engineering , transportation, and wind power generation .
研究领域:
机械工程
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材料科学
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润滑技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 22
·期 4
·1901369
·
IF 3.217
Xuan Yin,Jie Jin,Xinchun Chen,Andreas Rosenkranz,Jianbin Luo
The 2D Ti 3 C 2 /graphene quantum dots (GQDs) composite coating contains numerous merits, which offers underlying solutions for lubrication issues in common conditions. Herein, specific efforts are devoted to explore and develop the antiwear interfacial performances of 2D Ti 3 C 2 /GQDs hybrid multicoating in common environment. In addition, combination with nanodiamond would impose significant effects on improving lubricity of binary composite coating to obtain long-durability ternary composite coating. Meanwhile, macroscale and atomicscale characterizations are utilized to detect the lubrication behavior of binary and ternary composite coating to illuminate the influence of compositions on the establishment of ultralow-wear interfaces on slip process. These testing results highlight an outspread lubrication mechanism for 2D Ti 3 C 2 /GQDs hybrid multicoating. They suggest that 2D Ti 3 C 2 /GQDs and 2D Ti 3 C 2 /nanodiamond/GQDs composite coating exhibit ultralow wear with rubbing against polytetrafluoroethylene ball. A newly nanostructured tribofilm is formed on the sliding contact. Also the 2D Ti 3 C 2 /nanodiamond/GQDs ternary coating has long-durability and ultralow-wear during sliding for a long time.
研究领域:
材料科学
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表面工程
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摩擦学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 5
·939
·
IF 5.3
Qinghao Qin,Xia Cao,Ning Wang
Triboelectric nanogenerators have attracted extensive attention in energy harvesting due to its light weight, low cost, high flexibility, and diversity of function. However, deterioration in terms of mechanical durability and electrical stability of the triboelectric interface during operation, which are the results of material abrasion, severely limits their practical applications. In this paper, a durable triboelectric nanogenerator inspired by a ball mill was designed by using metal balls in hollow drums as carriers for charge generation and transfer. Composite nanofibers were deposited onto the balls, increasing the triboelectrification with the interdigital electrodes in the inner surface of the drum for higher output and electrostatic repulsion to each other for lower wear. Such a rolling design cannot only increase mechanical durability and maintenance convenience, where the filler can be easily replaced and recycled but also collect wind power with the decreased wearing of materials and sound efficiency in comparison with the typical rotation TENG. In addition, the short circuit current shows a strong linear relationship with the rotation speed in a wide range, which can be used to detect wind speed, thus showing potential applications in distributed energy conversion and self-powered environmental monitoring systems.Keywords:triboelectric nanogenerator;wind energy;low wear;rotation speed;self-powered sensor
研究领域:
能源材料
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WEAR
·
2022
·
IF 4.695
Jiang Wei,Wei Sun,Kun Liu,Xiaojun Liu,Kaisen Zhang,Qing Zhang,Jiaxin Ye
Prior studies suggest mechanical interlocking, preferential adhesion of polar polymers , and PTFE tribochemistry all contribute to the wear reduction in polar polymer-filled PTFE composites; whereas their relations remain poorly understood. This study aims to decouple the relevant mechanisms by investigating wear and tribofilm environmental sensitivities of a 5 wt% polyamide-imide (PAI) filled PTFE composite. The results highlight (1) strong correlation between a carboxylate-salt-rich transfer film and ultralow wear, and (2) a tribochemical interface gradient that discourages transfer film removal. We proposed that PTFE tribochemistry induces ultralow wear by significantly increasing (1) transfer film adhesion through a virtuous cycle of tribochemical accumulation and wear reduction and (2) transfer film cohesion by promoting a surface energy interface gradient beneficial to low wear.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
WEAR
·
2020
·
IF 4.108
Wei Sun,Xiaojun Liu,Kun Liu,Wei Wang,Jiaxin Ye
Nanosized α-phase alumina has been one of the few inorganic fillers that could induce 10 −7 mm 3 /Nm ultralow wear rates of PTFE for the past two decades. We report here two additional oxide fillers, beryllia (BeO) and germania (GeO 2 ) particles, that exhibit comparable wear reduction ability when filled in PTFE. Particle size and surface chemistry analysis revealed that the beryllia and germania particles had different structure and size from the alumina fillers used in this study whereas their composites shared similar ultralow wear rates and carboxylate salt rich tribofilms to the alumina PTFE system. Results in this study support both a particle structure driven and a tribochemistry driven wear reduction hypothesis for the alumina PTFE composite as previously suggested; whereas more systematic investigations are needed to elucidate wear resistance mechanisms in the beryllia and germania filled PTFE composites.
研究领域:
材料科学
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表面工程
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Chengyi Si,Yawen Zhang,Le Li,Tian Zhang,Hongyu Liu,Ao Men,Xiaoqiang Fan,Minhao Zhu
Despite methylphenylsiloxane (MPS) possesses heat-resistance and corrosion resistance , the brittleness hinders its widespread application. Herein, the polyimide (PI) and Ti 3 AlC 2 were introduced for modifying MPS, thereby preparing the T-PI-MPS coating. The bilayer structure of surface-enriched MPS and internal-enriched PI was achieved by controlling the addition amount along with the density difference. The results indicate that the T-PI-MPS coating achieved a contact angle of 95.1° and exhibited corrosion resistance to salt spray for 28 days. Compared to PI-MPS, the wear rate of T-PI-MPS was reduced by 85 % and the friction coefficient declined from 0.75 to 0.58. As expected, T-PI-MPS exhibited exceptional excellent heat-resistance. The exceptional performance is attributed to the following three factors: I. the MPS-enriched layer is characterized by a stable Si O chain organization. This structure gives the corrosion resistance and water resistance, and prevents the hydrolytic swelling of PI. II. the PI-enriched layer is constructed from imide bonds, which give the coating superior friction performance due to its high load-bearing capacity. III. the incorporation of Ti 3 AlC 2 plays a role in mitigating internal defects, prolonging the corrosion path, and inhibiting cracks due to its unique nanolayered structure, high temperature resistance, and hardness.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Qiulong Gao,Shuwen Liu,Yan Huang,Kaiming Hou,Zhangpeng Li,Jinqing Wang,Shengrong Yang
The development of environmentally friendly and cost-effective lubricating materials to reduce friction and wear at the macroscale is crucial for reducing fuel consumption and exhaust emissions, thereby enhancing sustainability. Deep eutectic solvents (DESs) have emerged as viable alternatives to traditional lubricants due to their ease of preparation, affordability, reproducibility, and superior tribological properties. Herein, a series of natural ternary DESs (TDESs) are successfully developed by blending eco-friendly and economical D-sorbitol and ethanolamine with quaternary ammonium salts through hydrogen bond interactions that may be regarded as a new and green liquid lubricating system. The synthesized TDESs exhibit exceptional thermal stability, rheological properties, corrosion resistance, and wettability towards metallic substrates. Moreover, the experimental results combined with molecular dynamics simulations indicate that the TDESs can form a robust protective lubricating film on steel surfaces through polar adsorption and tribochemical reactions. Consequently, the synthesized TDESs demonstrate a low friction coefficient (∼0.1) and ultra-low wear rate (as low as 7.8 × 10−10 mm3 N−1 m−1), exhibiting a near-zero wear behavior on steel surfaces under high load (100 N) and multi-environment scenarios. This research not only highlights the potential applications of DESs in tribology but also provides guidance for the future generation of green and high-performance liquid lubricating materials.
研究领域:
材料科学
·
摩擦学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）