Pub Date : 2024-10-13DOI: 10.1016/j.triboint.2024.110321
Tabrez Qureshi, Mohammad Mohsin Khan, Harveer Singh Pali
High-entropy (Hf0.2Zr0.2Ti0.2W0.2Mo0.2)B2 ceramics were synthesized using a two-step spark plasma sintering process, with densification at 1600 °C followed by sintering at 1850 °C. This method produced dense materials with excellent mechanical and tribological properties. Hardness values ranged from 18.85 GPa to 39.65 GPa, with a maximum Young’s modulus of 319 GPa. Micro-scratch tests showed high resistance to plastic deformation and minimal surface damage, highlighting durability under mechanical stress. Tribological tests at 15 N and 20 N loads demonstrated exceptional wear resistance, attributed to hard primary phases and lubricating soft secondary phases. These findings confirm the material’s robustness and show the effectiveness of the two-step synthesis in optimizing microstructure and enhancing properties, making it suitable for high-stress and wear-intensive applications.
采用两步火花等离子烧结工艺合成了高熵 (Hf0.2Zr0.2Ti0.2W0.2Mo0.2)B2 陶瓷，先在 1600 °C 下致密，然后在 1850 °C 下烧结。这种方法生产出的致密材料具有优异的机械和摩擦学特性。硬度值从 18.85 GPa 到 39.65 GPa 不等，最大杨氏模量为 319 GPa。微划痕测试表明，这种材料具有很强的抗塑性变形能力，表面损伤极小，在机械应力作用下具有很强的耐久性。在 15 N 和 20 N 负载下进行的摩擦学测试表明，该材料具有优异的耐磨性，这归功于坚硬的主相和润滑的软次相。这些研究结果证实了该材料的坚固性，并显示了两步合成法在优化微观结构和提高性能方面的有效性，使其适用于高应力和磨损密集型应用。
{"title":"Novel insights into the synthesis and tribo-mechanical performance of high-entropy (Hf0.2Zr0.2Ti0.2W0.2Mo0.2)B2 ceramics","authors":"Tabrez Qureshi, Mohammad Mohsin Khan, Harveer Singh Pali","doi":"10.1016/j.triboint.2024.110321","DOIUrl":"10.1016/j.triboint.2024.110321","url":null,"abstract":"<div><div>High-entropy (Hf<sub>0.2</sub>Zr<sub>0.2</sub>Ti<sub>0.2</sub>W<sub>0.2</sub>Mo<sub>0.2</sub>)B<sub>2</sub> ceramics were synthesized using a two-step spark plasma sintering process, with densification at 1600 °C followed by sintering at 1850 °C. This method produced dense materials with excellent mechanical and tribological properties. Hardness values ranged from 18.85 GPa to 39.65 GPa, with a maximum Young’s modulus of 319 GPa. Micro-scratch tests showed high resistance to plastic deformation and minimal surface damage, highlighting durability under mechanical stress. Tribological tests at 15 N and 20 N loads demonstrated exceptional wear resistance, attributed to hard primary phases and lubricating soft secondary phases. These findings confirm the material’s robustness and show the effectiveness of the two-step synthesis in optimizing microstructure and enhancing properties, making it suitable for high-stress and wear-intensive applications.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"202 ","pages":"Article 110321"},"PeriodicalIF":6.1,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142535904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-12DOI: 10.1016/j.triboint.2024.110320
Longxia Wang , Shifan Sun , Yujuan Zhang , Chunli Zhang , Shengmao Zhang
A multifunctional nanomaterial (ZnO-IL), comprising zinc oxide modified with corrosion-resistant ionic liquid groups, was designed and synthesized. It was used as an additive in bis(2-ethylhexyl) sebacate (DIOS) to evaluate its tribological and corrosion resistance properties, and compared with the commercial additive sulfurized isobutylene (SIB). ZnO-IL exhibited good solubility and thermal stability in DIOS. Lubricants containing ZnO-IL showed excellent anti-wear performance under various loads and temperatures. Its deposition on metal surfaces and the synergistic action of benzotriazole groups in the anions effectively prevented corrosion on the surfaces of metal friction pairs, thereby addressing the challenge of friction pair corrosion caused by the hydrolysis of ester-based oils. The ZnO-IL nanomaterial rapidly formed an organic-inorganic multilayer adsorption film on metal surfaces through electrostatic interactions. During friction, a boundary lubrication film composed of ZnO deposition and friction chemical reaction films was formed, thereby avoiding direct metal contact, reducing contact pressure, and exhibiting outstanding friction reduction and anti-wear properties.
{"title":"Ionic liquid-functionalized ZnO nanomaterial: Multifunctional additives enhancing tribological performance and corrosion resistance in ester oil","authors":"Longxia Wang , Shifan Sun , Yujuan Zhang , Chunli Zhang , Shengmao Zhang","doi":"10.1016/j.triboint.2024.110320","DOIUrl":"10.1016/j.triboint.2024.110320","url":null,"abstract":"<div><div>A multifunctional nanomaterial (ZnO-IL), comprising zinc oxide modified with corrosion-resistant ionic liquid groups, was designed and synthesized. It was used as an additive in bis(2-ethylhexyl) sebacate (DIOS) to evaluate its tribological and corrosion resistance properties, and compared with the commercial additive sulfurized isobutylene (SIB). ZnO-IL exhibited good solubility and thermal stability in DIOS. Lubricants containing ZnO-IL showed excellent anti-wear performance under various loads and temperatures. Its deposition on metal surfaces and the synergistic action of benzotriazole groups in the anions effectively prevented corrosion on the surfaces of metal friction pairs, thereby addressing the challenge of friction pair corrosion caused by the hydrolysis of ester-based oils. The ZnO-IL nanomaterial rapidly formed an organic-inorganic multilayer adsorption film on metal surfaces through electrostatic interactions. During friction, a boundary lubrication film composed of ZnO deposition and friction chemical reaction films was formed, thereby avoiding direct metal contact, reducing contact pressure, and exhibiting outstanding friction reduction and anti-wear properties.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"202 ","pages":"Article 110320"},"PeriodicalIF":6.1,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142535908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.triboint.2024.110317
Zhiwei Wang , Jiliang Mo , Chunguang Zhao , Quan Wang , Kaiyun Wang
A longitudinal-vertical coupled dynamics model (LVCDM) of a vehicle-track system (VTS) with disc brake systems is established, incorporating disc-pad nonlinear friction using the Stribeck model, with parameters derived from block-on-disc tribological tests. This model integrates the brake system with the VTS through nonlinear frictions in wheel-rail and disc-pad interface. Dynamic effects between the rotational motion of brake disc and the longitudinal, vertical, and pitch motions of VTS various components are captured. This model, validated through field tests, enables in-depth investigations into brake stick-slip vibrations of VTS. The results indicate that brake stick-slip vibrations intensify its own oscillations, thereby degrading braking performance. Additionally, it induces significant vibrations of bogie frames and wheelsets, adversely affecting vehicle ride comfort and running safety.
{"title":"Dynamic modeling and brake stick-slip vibration analysis of a vehicle-track system with disc-pad nonlinear frictions","authors":"Zhiwei Wang , Jiliang Mo , Chunguang Zhao , Quan Wang , Kaiyun Wang","doi":"10.1016/j.triboint.2024.110317","DOIUrl":"10.1016/j.triboint.2024.110317","url":null,"abstract":"<div><div>A longitudinal-vertical coupled dynamics model (LVCDM) of a vehicle-track system (VTS) with disc brake systems is established, incorporating disc-pad nonlinear friction using the Stribeck model, with parameters derived from block-on-disc tribological tests. This model integrates the brake system with the VTS through nonlinear frictions in wheel-rail and disc-pad interface. Dynamic effects between the rotational motion of brake disc and the longitudinal, vertical, and pitch motions of VTS various components are captured. This model, validated through field tests, enables in-depth investigations into brake stick-slip vibrations of VTS. The results indicate that brake stick-slip vibrations intensify its own oscillations, thereby degrading braking performance. Additionally, it induces significant vibrations of bogie frames and wheelsets, adversely affecting vehicle ride comfort and running safety.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"202 ","pages":"Article 110317"},"PeriodicalIF":6.1,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.triboint.2024.110315
Shaohua Liu , Jinzhi Li , Xianglin Su , Senlin Cui , Haifeng Zhang , Zhiheng Ren
A series of high chromium white cast iron (HCCI) alloys with varying Cr:C ratios were designed and fabricated through the squeeze casting process. This study investigates the effect of the Cr:C ratio on the mechanical properties, microstructure, phase diagram, and both low-stress and high-stress abrasion performance of HCCIs. Alloys with a very high Cr:C ratio exhibited better impact toughness but poorer hardness. Scanning electron microscopy (SEM) and phase diagram calculations elucidated the influence of the Cr:C ratio on microstructure, carbide volume fraction, and carbide type. Abrasion resistance was evaluated using impact abrasive wear (high-stress) and rubber-wheel (low-stress) abrasion on quartzite in open three-body wear. Comprehensive assessments under impact abrasive wear and rubber-wheel abrasive wear conditions suggest that the alloy achieves optimal abrasion resistance with a Cr:C ratio ranging from 8 to 11. Post-wear analysis reveals that surface damage varies between high-stress and low-stress conditions. The microstructure of squeeze HCCIs is significantly influenced by the Cr:C ratio, resulting in diverse operative wear mechanisms, including micro-cutting and micro-fracture. Successful adjustment of the Cr:C ratio led to the attainment of a nearly eutectic HCCIs composition suitable for squeeze casting.
{"title":"Effect of Cr:C ratio on open three-body wear resistance of squeeze cast high chromium cast iron","authors":"Shaohua Liu , Jinzhi Li , Xianglin Su , Senlin Cui , Haifeng Zhang , Zhiheng Ren","doi":"10.1016/j.triboint.2024.110315","DOIUrl":"10.1016/j.triboint.2024.110315","url":null,"abstract":"<div><div>A series of high chromium white cast iron (HCCI) alloys with varying Cr:C ratios were designed and fabricated through the squeeze casting process. This study investigates the effect of the Cr:C ratio on the mechanical properties, microstructure, phase diagram, and both low-stress and high-stress abrasion performance of HCCIs. Alloys with a very high Cr:C ratio exhibited better impact toughness but poorer hardness. Scanning electron microscopy (SEM) and phase diagram calculations elucidated the influence of the Cr:C ratio on microstructure, carbide volume fraction, and carbide type. Abrasion resistance was evaluated using impact abrasive wear (high-stress) and rubber-wheel (low-stress) abrasion on quartzite in open three-body wear. Comprehensive assessments under impact abrasive wear and rubber-wheel abrasive wear conditions suggest that the alloy achieves optimal abrasion resistance with a Cr:C ratio ranging from 8 to 11. Post-wear analysis reveals that surface damage varies between high-stress and low-stress conditions. The microstructure of squeeze HCCIs is significantly influenced by the Cr:C ratio, resulting in diverse operative wear mechanisms, including micro-cutting and micro-fracture. Successful adjustment of the Cr:C ratio led to the attainment of a nearly eutectic HCCIs composition suitable for squeeze casting.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"202 ","pages":"Article 110315"},"PeriodicalIF":6.1,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142535903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.triboint.2024.110316
Xiaolong Zhang, Junhui Zhang, Bing Xu, Chao Zhang
This study proposes the periodic dual-mixing method (PDMM) that can rapidly and robustly solve ultra-thin fluid-structure interaction (UTFSI) problems, especially in severe mixed lubrication. The dual mixing denotes a two-step process: the first step is to mix the historical inputs and outputs separately according to optimal mixing weights; the obtained results are mixed with dynamic damping factors in the second step to predict the deformation of the next iteration. Meanwhile, the residual is injected into the predicted deformation periodically. The comparison study is carried out with the popular IQN-ILS method in general FSI, which shows the PDMM is 5.3 times faster and 5 times more robust. Furthermore, the advantages of the PDMM are more significant under harsh mixed lubrication conditions.
{"title":"Periodic dual-mixing method for fast and robust solving of ultra-thin fluid-structure interaction problems","authors":"Xiaolong Zhang, Junhui Zhang, Bing Xu, Chao Zhang","doi":"10.1016/j.triboint.2024.110316","DOIUrl":"10.1016/j.triboint.2024.110316","url":null,"abstract":"<div><div>This study proposes the periodic dual-mixing method (PDMM) that can rapidly and robustly solve ultra-thin fluid-structure interaction (UTFSI) problems, especially in severe mixed lubrication. The dual mixing denotes a two-step process: the first step is to mix the historical inputs and outputs separately according to optimal mixing weights; the obtained results are mixed with dynamic damping factors in the second step to predict the deformation of the next iteration. Meanwhile, the residual is injected into the predicted deformation periodically. The comparison study is carried out with the popular IQN-ILS method in general FSI, which shows the PDMM is 5.3 times faster and 5 times more robust. Furthermore, the advantages of the PDMM are more significant under harsh mixed lubrication conditions.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"202 ","pages":"Article 110316"},"PeriodicalIF":6.1,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.triboint.2024.110311
Ning Jiang , Rundong Qian , Haiyu Qiao , Yani Chen , Honghui Cao , Yayun Liu , Chuanyang Wang
This study presents a comprehensive approach to enhancing RV reducer performance. A novel RAM viscosity-pressure model is developed, combining traditional stability with neural network precision. Surface micro-morphological analysis is integrated with contact fatigue modeling, revealing critical insights into surface characteristics and their impact on fatigue. A neural proxy-based optimization strategy is employed to identify optimal operational parameters, significantly reducing fatigue risks. Additionally, a new method for real-time transmission ratio monitoring is introduced, validating the model's effectiveness and offering a robust framework for improving the reliability and lifespan of RV reducers in industrial applications.
{"title":"Neural-driven viscosity modeling and fatigue optimization for cycloidal gear systems","authors":"Ning Jiang , Rundong Qian , Haiyu Qiao , Yani Chen , Honghui Cao , Yayun Liu , Chuanyang Wang","doi":"10.1016/j.triboint.2024.110311","DOIUrl":"10.1016/j.triboint.2024.110311","url":null,"abstract":"<div><div>This study presents a comprehensive approach to enhancing RV reducer performance. A novel RAM viscosity-pressure model is developed, combining traditional stability with neural network precision. Surface micro-morphological analysis is integrated with contact fatigue modeling, revealing critical insights into surface characteristics and their impact on fatigue. A neural proxy-based optimization strategy is employed to identify optimal operational parameters, significantly reducing fatigue risks. Additionally, a new method for real-time transmission ratio monitoring is introduced, validating the model's effectiveness and offering a robust framework for improving the reliability and lifespan of RV reducers in industrial applications.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"202 ","pages":"Article 110311"},"PeriodicalIF":6.1,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-10DOI: 10.1016/j.triboint.2024.110314
Fernando Rodríguez-Rojas , Estíbaliz Sánchez-González , Óscar Borrero-López , Mark Hoffman
Polymer-ceramic composites are widely employed in dental prostheses. However, due to low hardness values, their lifetime is often limited by wear. Here, the wear of commercially available dental CAD/CAM composites is explored through in-vitro tests involving extended sliding contact with a zirconia antagonist. The predominant wear mode is abrasion, with specific mechanisms including plastic deformation at the asperity level and microcracking. The extent of damage exhibits significant variability as a function of materials’ microstructure, resulting in wear volume differences of up to two orders of magnitude. The findings are analyzed within the framework of tribology and contact fracture mechanics. Strategies for enhancing durability are discussed, emphasizing potential microstructural engineering approaches—increasing hardness, improving particle-matrix adhesive strength, and optimizing particle aspect ratio.
{"title":"In-vitro study of the sliding-wear of CAD/CAM dental composite materials","authors":"Fernando Rodríguez-Rojas , Estíbaliz Sánchez-González , Óscar Borrero-López , Mark Hoffman","doi":"10.1016/j.triboint.2024.110314","DOIUrl":"10.1016/j.triboint.2024.110314","url":null,"abstract":"<div><div>Polymer-ceramic composites are widely employed in dental prostheses. However, due to low hardness values, their lifetime is often limited by wear. Here, the wear of commercially available dental CAD/CAM composites is explored through <em>in-vitro</em> tests involving extended sliding contact with a zirconia antagonist. The predominant wear mode is abrasion, with specific mechanisms including plastic deformation at the asperity level and microcracking. The extent of damage exhibits significant variability as a function of materials’ microstructure, resulting in wear volume differences of up to two orders of magnitude. The findings are analyzed within the framework of tribology and contact fracture mechanics. Strategies for enhancing durability are discussed, emphasizing potential microstructural engineering approaches—increasing hardness, improving particle-matrix adhesive strength, and optimizing particle aspect ratio.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"202 ","pages":"Article 110314"},"PeriodicalIF":6.1,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-10DOI: 10.1016/j.triboint.2024.110287
Hongkang Pan , Zhengwen Zhang , Yushu Xiao , Fang Guo , Wenbo Wang , Hailin Lu
Cathodic deposition (CD) is a material preparation and surface modification technique which is based on the electrolytic principle of reducing a layer of metal, alloy or compound on the cathodic substrate surface. However, the CD technique is only applicable to non-valved metals. In this paper, we firstly use laser remelting (LR) technology to change the morphology of the valve metal 6061 aluminium alloy surface, and then use CD technology to treat the valve metal 6061 aluminium alloy surface. This method solved the problem of not being able to use CD technology on valve metal 6061 aluminum alloy and prepared a Ni/W coating on the surface of valve metal 6061 aluminum alloy. Energy dispersive spectroscopy (EDS)/X-ray diffraction (XRD)/Scanning electron microscopy (SEM) was used to characterize the micro-morphology and elemental composition of the prepared coatings. The friction and corrosion properties were tested by friction and corrosion experiments. The results show that the coating obtained after LR and CD has the advantages of high hardness, large thickness, good wear resistance, small friction coefficient and good corrosion resistance. By using LR technology for pre-treatment makes CD technology directly usable on the valve metal surface, which is of great significance for subsequent applications.
阴极沉积（CD）是一种材料制备和表面改性技术，它基于电解原理，在阴极基底表面还原一层金属、合金或化合物。然而，阴极电镀技术只适用于非椭圆形金属。本文首先利用激光重熔（LR）技术改变阀门金属 6061 铝合金表面的形态，然后利用 CD 技术处理阀门金属 6061 铝合金表面。该方法解决了无法在金属气门 6061 铝合金上使用 CD 技术的问题，并在金属气门 6061 铝合金表面制备了一层 Ni/W 涂层。能量色散光谱（EDS）/X 射线衍射（XRD）/扫描电子显微镜（SEM）用于表征所制备涂层的微观形态和元素组成。摩擦和腐蚀实验测试了涂层的摩擦和腐蚀特性。结果表明，经过 LR 和 CD 处理的涂层具有硬度高、厚度大、耐磨性好、摩擦系数小和耐腐蚀性好等优点。通过使用 LR 技术进行前处理，使 CD 技术可直接用于阀门金属表面，这对后续应用具有重要意义。
{"title":"Preparation the Ni/W coating on 6061 aluminium alloy surface using laser remelting and high voltage cathodic deposition techniques","authors":"Hongkang Pan , Zhengwen Zhang , Yushu Xiao , Fang Guo , Wenbo Wang , Hailin Lu","doi":"10.1016/j.triboint.2024.110287","DOIUrl":"10.1016/j.triboint.2024.110287","url":null,"abstract":"<div><div>Cathodic deposition (CD) is a material preparation and surface modification technique which is based on the electrolytic principle of reducing a layer of metal, alloy or compound on the cathodic substrate surface. However, the CD technique is only applicable to non-valved metals. In this paper, we firstly use laser remelting (LR) technology to change the morphology of the valve metal 6061 aluminium alloy surface, and then use CD technology to treat the valve metal 6061 aluminium alloy surface. This method solved the problem of not being able to use CD technology on valve metal 6061 aluminum alloy and prepared a Ni/W coating on the surface of valve metal 6061 aluminum alloy. Energy dispersive spectroscopy (EDS)/X-ray diffraction (XRD)/Scanning electron microscopy (SEM) was used to characterize the micro-morphology and elemental composition of the prepared coatings. The friction and corrosion properties were tested by friction and corrosion experiments. The results show that the coating obtained after LR and CD has the advantages of high hardness, large thickness, good wear resistance, small friction coefficient and good corrosion resistance. By using LR technology for pre-treatment makes CD technology directly usable on the valve metal surface, which is of great significance for subsequent applications.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"202 ","pages":"Article 110287"},"PeriodicalIF":6.1,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study explored the relationship between the solubility of additives in base oils and their friction-reduction efficacy using cetyl alcohol as a model additive. Atomic force microscope friction tests demonstrated that the friction-reduction effect of cetyl alcohol varied significantly across the base oils. The solvation free energy was computed to evaluate the solubility of cetyl alcohol. A direct proportional relationship between friction-reduction and solvation free energy was observed, indicating additives with lower solubility have better friction-reduction performance. Neutron reflectometry experiments and molecular dynamics simulations revealed that lower solubility correlates with stronger adsorption. This study quantitatively clarified the relationship between solubility, adsorption, and friction reduction, providing insights into optimizing lubricant formulations and contributing to a deeper understanding of boundary lubrication mechanisms.
{"title":"Relationship between Friction Reduction Effect and Solubility in Base Oil of Organic Friction Modifiers","authors":"Haiyang Gu , Tomoko Hirayama , Naoki Yamashita , Jimin Xu , Masako Yamada","doi":"10.1016/j.triboint.2024.110304","DOIUrl":"10.1016/j.triboint.2024.110304","url":null,"abstract":"<div><div>This study explored the relationship between the solubility of additives in base oils and their friction-reduction efficacy using cetyl alcohol as a model additive. Atomic force microscope friction tests demonstrated that the friction-reduction effect of cetyl alcohol varied significantly across the base oils. The solvation free energy was computed to evaluate the solubility of cetyl alcohol. A direct proportional relationship between friction-reduction and solvation free energy was observed, indicating additives with lower solubility have better friction-reduction performance. Neutron reflectometry experiments and molecular dynamics simulations revealed that lower solubility correlates with stronger adsorption. This study quantitatively clarified the relationship between solubility, adsorption, and friction reduction, providing insights into optimizing lubricant formulations and contributing to a deeper understanding of boundary lubrication mechanisms.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"202 ","pages":"Article 110304"},"PeriodicalIF":6.1,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-10DOI: 10.1016/j.triboint.2024.110309
Xue Wang , Congcong Ma , Guangbin Yang , Shengmao Zhang , Yujuan Zhang , Zhengquan Jiang , Laigui Yu , Pingyu Zhang
In recent years, with the increase in energy demand and gradual scarcity of medium and shallow oil and gas resources, oil and gas exploration has shifted to special wells such as deep wells, ultra-deep wells, and extended reach wells. These complex wellbore structures inevitably increase the torque and friction between the casing and the drill pipe during drilling, which aggravates friction and wear, and leads to accidents such as drill sticking and drill breakage in severe cases. In this study, molybdenum disulfide/bentonite (MoS2/Bent) nanohybrids as drilling fluid lubricant were synthesized by hydrothermal method using sodium molybdate (Na2MoO4) and thiourea (CH4N2S) as raw materials and bentonite as carrier. The as-synthesized MoS2/Bent nanohybrid was characterized by X-ray powder diffractometer, transmission electron microscopy, Fourier transform infrared spectroscopy, and the high temperature resistance and tribological properties of MoS2/Bent nanohybrid were evaluated in base slurry. The results show that the friction coefficient of MoS2/Bent nanohybrid drilling fluid before aging is reduced by 74 % and the wear rate is reduced by 97 % compared with the base slurry. After high-temperature aging at 240 °C, the friction coefficient is reduced by 77 % and the wear rate is reduced by 90 %. The excellent friction reducing and antiwear performance is attributed to the formation of low shear strength MoS2 deposition film and oxide tribofilm on the surface of the friction pair during the rubbing process.
近年来，随着能源需求的增加和中浅层油气资源的逐渐匮乏，油气勘探已转向深井、超深井、延伸井等特殊井。这些复杂的井筒结构不可避免地增加了钻井过程中套管与钻杆之间的扭矩和摩擦力，加剧了摩擦和磨损，严重时会导致卡钻、断钻等事故。本研究以钼酸钠（Na2MoO4）和硫脲（CH4N2S）为原料，以膨润土为载体，通过水热法合成了二硫化钼/膨润土（MoS2/Bent）纳米杂化物作为钻井液润滑剂。利用 X 射线粉末衍射仪、透射电子显微镜、傅立叶变换红外光谱对合成的 MoS2/Bent 纳米杂化物进行了表征，并在基浆中对 MoS2/Bent 纳米杂化物的耐高温性能和摩擦学性能进行了评价。结果表明，与基础泥浆相比，老化前 MoS2/Bent 纳米杂化钻井液的摩擦系数降低了 74%，磨损率降低了 97%。在 240 °C 高温老化后，摩擦系数降低了 77%，磨损率降低了 90%。优异的减摩抗磨性能归功于摩擦过程中在摩擦副表面形成的低剪切强度 MoS2 沉积膜和氧化物三膜。
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