Article
Materials Science, Multidisciplinary
Nurul Athirah Ismail, Zaira Zaman Chowdhury, Mohd Rafie Johan, Nurin Wahidah Mohd Zulkifli
Summary: AGO-C(n)/MoS2 composites were synthesized using a facile hydrothermal method and investigated for their tribological properties as lubricant additives in Group III petroleum-based oil. Results showed that the composites significantly improved friction reduction and antiwear properties of the oil, with the 1:1 mass ratio AGO-C14/MoS2 composite exhibiting the best performance. This enhanced tribological behavior was attributed to the synergistic effect and unique layered structure of AGO-C(n) and MoS2.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Chemistry, Physical
Long Wang, Anh Kiet Tieu, Guojuan Hai, Jiaqing Li, Hongtao Zhu, The Pham Sang, Jun Yang
Summary: The study demonstrates an improved load-carrying capability of a composite of sodium carbonate and graphene in lubricated contacts under heavier loads, reducing friction and wear significantly. The enhanced lubricating property is attributed to stronger adhesion of the composite on the steel surface and the formation of a sliding-induced soft tribofilm.
Article
Engineering, Mechanical
Yuan Qin, Mingxia Wu, Yongfeng Yang, Yi Yang, Gang Yang
Summary: The effect of thermal activation on the tribological properties of halloysite was investigated, and it was found that the anti-wear properties of the calcined products are significantly improved due to the easier formation of multilayer nanocrystalline tribofilm.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
James Carpenter, Hyunchul Kim, Jules Suarez, Arend van der Zande, Nenad Miljkovic
Summary: The surface energy of graphene and its chemical derivatives plays a crucial role in important interfacial interactions. However, determining the surface energy of ultra-thin two-dimensional materials like graphene is challenging due to various factors. In this study, the polar and dispersive surface energy of bare, fluorinated, and hydrogenated graphene were measured using contact angle measurements with water and diiodomethane. The results provide insights into how the chemical structure modification of graphene affects its surface energy, with potential applications in various fields. Keywords: graphene, wettability, surface energy, chemical functionalization, 2D materials.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Weiwei Tang, Baogang Wang, Guiqiang Wen, Yufeng Li
Summary: The use of A-CDs as lubricant additives can effectively reduce friction and prolong wear time under specific conditions, forming dense boundary lubrication films to avoid direct particle collisions, demonstrating outstanding long-term friction reduction and anti-wear capabilities.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Engineering, Mechanical
Zeyong Han, Chaoliang Gan, Xiaopeng Li, Peng Feng, Xiaoliang Ma, Xiaoqiang Fan, Minhao Zhu
Summary: In this study, imidazolyl dinitrile amine salt was used as an intercalation agent and modifier to achieve the exfoliation and modification of graphite into graphene. Surface/interface techniques were employed to ensure successful preparation and high-density modification of the graphene. The modified graphene showed improved tribological behaviors and stability in polyethylene glycol 200, attributed to its thinner size and protective layer on mating interfaces.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Janez Kogovsek, Mitjan Kalin
Summary: The study focuses on comparing the tribological behavior of graphene platelets and commercially available automotive additive package combined with glyceryl isostearate (GIS) as a friction modifier. Steel/steel and DLC/DLC contacts were investigated under all lubrication regimes and different temperatures, considering the running-in effect. The research findings show that graphene platelets provide the lowest friction in the mixed and boundary lubrication regimes, attributed to the formation of graphene-based tribofilms that are relatively insensitive to temperature and other conditions.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Multidisciplinary
Chiew Tin Lee, Mei Bao Lee, Siti Hartini Hamdan, William Woei Fong Chong, Cheng Tung Chong, Hedong Zhang, Allan Woei Loon Chen
Summary: This study investigates the tribological influence of TMP trioleate as a green additive to a low viscosity Polyalphaolefin (PAO) at different lubrication regimes using Stribeck-type analysis. The results show that blending PAO with 5-vol% TMP trioleate significantly increases its viscosity index. Tribologically, this blend exhibits lower friction power and wear scar diameter compared to neat PAO, particularly in the mixed lubrication regime.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2022)
Article
Chemistry, Physical
Jose M. Lineira del Rio, Enriqueta R. Lopez, Fatima Garcia, Josefa Fernandez
Summary: The synergistic effects of two functionalized graphene oxides and a phosphonium ionic liquid as additives in a biodegradable ester base oil were investigated. The nanolubricants formulated showed significant reductions in friction coefficients and wear compared to the base oil. Surface repairing, synergistic effect, and tribofilm formation mechanisms were observed through Raman microscopy and roughness analysis.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Materials Science, Ceramics
Yangqin Liu, Lin Liu, Pengfei Shi, Yang Wang, Linmao Qian, Lei Chen
Summary: In this study, the tribological behaviors of CBN/Si3N4 pairs were investigated to simulate the cutting process of CBN tools on ceramics. It was found that the use of an optimal hBN aqueous solution as a cutting fluid significantly reduced the wear rate of CBN and improved the material removal of Si3N4 compared to pure water lubrication. The results contribute to the development of environmentally friendly lubricants for difficult-to-machine materials.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Tongtong Yu, Shusheng Xu, Zishuai Wu, Daoai Wang
Summary: 2D SiP nanoflakes have been found to have significant reduction effects on the coefficient of friction and wear volume of the liquid. Adding SiP nanoflakes to the lubricant enhances the liquid's ability to resist pressure and form an anti-friction film.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Khodor I. Nasser, Jose M. Lineira del Rio, Fatima Marino, Enriqueta R. Lopez, Josefa Fernandez
Summary: The tribological performance of polyalphaolefin 32 was investigated with the addition of two nanomaterials and an ionic liquid, showing improvements in anti-friction behavior and anti-wear behavior. The best anti-friction behavior was observed in the PAO/IL3/GnP/h-BN system. Additionally, there were positive synergies found between each ionic liquid and the graphene nanoplatelets/hexagonal boron nitride hybrid additives in the PAO.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Tiancheng Ouyang, Xiuyang Sun, Wentao Tang, Yinxuan Li, Zhi Qun Tian, Yanzhou Li
Summary: By adding nitrogen-doped graphene and C60 nanoparticles to the lubricant, a highly efficient nano-lubricant with vibration and noise reduction properties is synthesized.
Article
Engineering, Mechanical
Xiaozhi Zhang, Yaojie Yan, Peng Wang, Tingting Zhang, Shujuan Liu, Qian Ye, Feng Zhou
Summary: The thiadiazole functionalized covalent organic frameworks were synthesized using polydopamine as a connection layer. The fluorine-containing COF-F was prepared through solvothermal reaction and then coated with a PDA layer. The anti-wear agent thiadiazole dimer covalently bonded with PDA to obtain thiadiazole functionalized COFs (DTD@COF-F), which exhibited good tribological properties as oil-based lubricant additives, including a low and stable friction coefficient (0.104) and a 67.8% reduction in wear volume compared to the base oil 500SN. The excellent lubrication performance is attributed to the robust protective tribo-film and the easy absorption of the anti-wear thiadiazole molecule functionalized COFs onto the friction pairs.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Bo Yu, Kai Wang, Xianjuan Pang, Gensheng Wu, Jibin Pu, Haichao Zhao
Summary: By grafting octadecylamine onto graphene oxide through a simple amidation reaction, ODA-RGO was obtained as a lubricant additive, showing beneficial effects on lubrication and friction-reduction. The excellent tribological behavior was attributed to the formation of a protective film and the restacked shape of ODA-RGO.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
M. A. N. Ardila, H. L. Costa, J. D. B. de Mello
Article
Engineering, Mechanical
Felipe Gustavo Ebersbach, Gisele Hammes, Jose Daniel Biasoli de Mello, Rolf Bertrand Schroeter, Cristiano Binder, Aloisio Nelmo Klein
Summary: This study investigated the tribological behavior of sintered self-lubricating composites subjected to turning. The results showed that the friction coefficient and wear rate of turned surfaces were higher compared to sintered surfaces. Additionally, turning was effective in reducing the surface roughness parameters of the composites.
TRIBOLOGY TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
Elisangela Aparecida dos Santos de Almeida, Julio Cesar Giubilei Milan, Cesar Edil da Costa, Cristiano Binder, Jose Daniel Biasoli de Mello, Henara Lillian Costa
Summary: The use of DLC coatings to protect surface topography of rolls in cold rolling was proposed in this study, replacing carcinogenic hard chrome. The adhesion, surface topography changes, and durability of the coating were comprehensively evaluated. The results showed that DLC deposition reduced the roughness of the textured specimens and provided stable friction and good durability.
Article
Engineering, Mechanical
Thiago de Souza Lamim, Diego Salvaro, Renan Oss Giacomelli, Roberto Binder, Cristiano Binder, Aloisio Nelmo Klein, Jose Daniel Biasoli de Mello
Summary: The shape and dimensions of components are crucial in plasma nitriding processes, affecting the microstructural characteristics and tribological properties. The presence of the hollow cathode effect can lead to the formation of columnar nitride compound layers, while the braunite layer significantly influences the wear rate.
Article
Engineering, Mechanical
W. S. Labiapari, R. J. Goncalves, C. M. de Alcantara, V. Pagani, J. C. Di Cunto, J. D. B. de Mello
Summary: Brazil's key economic activities, mining and agribusiness, heavily depend on water and are affected by corrosion of carbon steel. Wear resistance is vital for performance and economy, leading to the use of more efficient materials. Testing different materials, ferritic stainless steel outperformed AHSSs in a concrete mixer environment for increased equipment lifespan.
Article
Engineering, Mechanical
J. L. Goncalves Jr, J. D. B. De Mello, H. L. Costa
Summary: This study used a new methodology to analyze the tribological behavior of coatings/surface modifications with potential to replace carcinogenic hard chrome. The electroless NiP coating exhibited the lowest friction coefficients, while plasma nitrided specimens showed the highest. The tribolayer rich in Nickel, Phosphorus, and Oxygen on specimens with electroless NiP coating was found to provide low and stable friction coefficient values and reduced wear rates.
Article
Engineering, Mechanical
Nicolas Araya Rivera, Guilherme Oliveira Neves, Renan Oss Giacomelli, Diego Salvaro, Cristiano Binder, Jose Daniel Biasoli de Mello
Summary: This study investigated the tribological performance of nanostructured turbostratic graphite derived from the solid-state dissociation of carbides. The results showed that CDC nanoparticles significantly reduced friction coefficients and wear rates compared to commercial crystalline graphite particles. The slow release of solid lubricant from the pores during testing was found to be crucial for the stability of the lubricious tribolayer.
Article
Materials Science, Multidisciplinary
D. Abreu, W. M. Silva, M. A. N. Ardila, J. D. B. de Mello
Summary: This study improved a potentiodynamic-based method for analyzing the tribocorrosion of ferritic stainless steel. By combining the average friction coefficient curves from sliding tests and tribocorrosion tests, all essential parameters of tribocorrosion phenomena can be analyzed.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2022)
Article
Engineering, Mechanical
Leticia Maria Anselmo, Thiago de Souza Lamim, Matheus Hromatka, Jose Daniel Biasoli de Mello, Aloisio Nelmo Klein, Gisele Hammes, Cristiano Binder
Summary: This paper investigates the effect of post-sintering sizing process on the tribological performance of self-lubricating iron-based composites. The experimental results show that adjusting the sizing pressure can improve the friction performance of the composites, reducing scuffing resistance and wear rate.
Article
Materials Science, Multidisciplinary
Guilherme Oliveira Neves, Nicolas Araya, Jose Daniel Biasoli de Mello, Cristiano Binder, Aloisio Nelmo Klein
Summary: A novel synthesis method of nanostructured carbon derived from carbides was developed in this work, achieving high carbon recovery and proposing a mechanism for the formation of nanostructured carbon during the reaction. The nanostructured carbon produced by this method has lubricating and anti-wear properties, and exhibits excellent dispersibility in lubricant oil, opening up a wide range of potential applications.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Engineering, Mechanical
Keli Vanessa Salvador Damin, Alicia Correa Lucena, Bruno Borges Ramos, Aloisio Nelmo Klein, Tatiana Bendo, Jose Daniel Biasoli de Mello, Cristiano Binder
Summary: The present study investigated the addition of molybdenum to a Fe + 0.6% C + 3% SiC self-lubricating composite through plasma treatment and powder mixing methods. The results showed that plasma treatment with an average content of 1.6 wt % Mo in the first 10 μm achieved the best tribological properties, with a significant increase (4500%) in scuffing resistance and a reduction in friction coefficient. Surface enrichment of self-lubricating composites was proven to be a viable, cost-effective, and reliable alternative for improving their tribological properties.
Article
Engineering, Mechanical
Gustavo Alves Lau, Guilherme Oliveira Neves, Diego Berti Salvaro, Cristiano Binder, Aloisio Nelmo Klein, Jose Daniel Biasoli de Mello
Summary: This study investigated the suspension stability and tribological performance of GBC, GSF, and GNH particles in a low-viscosity polyol ester lubricating oil. The results showed that GBC particles exhibited remarkable suspension stability and significantly reduced the wear rate. The presence of GBC and GSF particles also resulted in a decrease in wear rate, while GNH particles increased the wear rate. Moreover, the formation of highly disordered carbon tribolayers contributed to the improvement of wear rate.
Editorial Material
Engineering, Mechanical
Jose Daniel Biasoli de Mello, Henara Lilian Costa
Summary: This first regional issue published in STMP highlights the potential and importance of research in Latin America on surface engineering and tribology. It presents a comprehensive historical account of Brazilian tribology, including its early development in the 1980s, the growth of research in academic and industrial settings, and notable achievements such as flexible engines and oil-less compressors. The current status of tribology research groups and future trends envisioned by the Brazilian tribology community are also discussed.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2023)
Article
Engineering, Mechanical
Gabriel Borges, Diego Salvaro, Roberto Binder, Cristiano Binder, Aloisio N. Klein, Jose D. B. de Mello
Summary: This study investigates the development of a novel hermetic compressor design from traditional lubricated, circular motion to an innovative linear motion, variable displacement, single tribological contact, oil-less compressor. Emphasis is placed on the tribolayer formed in the piston-cylinder tribopair in fluorine-rich atmospheres. Tests show enhanced tribological properties of Si-rich hydrogenated DLC (a:C-H) under such conditions, with significant influence of atmosphere and stroke frequencies observed.
FRONTIERS IN MECHANICAL ENGINEERING-SWITZERLAND
(2021)
Article
Engineering, Mechanical
Halley Welther Jacques Dias, Alessandra Batista Medeiros, Cristiano Binder, Joao Batista Rodrigue Neto, Jose Daniel Biasoli de Mello
Summary: In this study, Fe-SiC composites were obtained using powder technology, with SiC particles acting as precursors to generate a large amount of turbostratic graphite dispersed in the composite matrix. The alloy composition was selected using Thermo-Calc(R) software to stabilize the graphite phase in iron, leading to high yield. Extracted turbostratic 2D graphite particles dispersed in mineral oil showed reduced friction coefficient and wear rate compared to pure mineral oil or mineral oil with commercial graphite particles added, attributed to the low degree of interaction between the atomic planes due to misorientation and increased interplanar distances of turbostratic graphite.