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Lubricants
Scopus
ISSN 2075-4442 · MDPI AG · 2,852 articles in the index
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Early-Stage Damage Diagnosis of Rolling Bearings Based on Acoustic Emission Signals Interpreted by Friction Behavior and Machine Learning
Condition monitoring of rolling bearings is essential for ensuring the reliability of mechanical systems operating under severe or insufficient lubrication conditions. This study proposes a fault diagnosis framework that integrates tribological interpretation of wear phenomena, acoustic emission…
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Adaptive Lubrication Enhancement of Piston Ring Seals via Fluid Pressure-Induced Waviness for High-Power Clutches
High-power clutches operating under high-frequency engagement–disengagement cycles demand piston ring seals with exceptional leakage control and tribological reliability. Conventional architectures often experience lubrication failure and severe adhesive wear during transient pressure fluctuations…
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Key Technologies and Research Progress of Cemented Carbide Bearings in Marine Environments: Materials, Tribology and Reliability
This review provides a comprehensive evaluation of the key technologies and latest advances in cemented carbide bearings for marine environments, such as navigation equipment and deep-sea operations. Given the rigorous performance requirements imposed on bearings by the extreme conditions of marine…
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Optimization of Surface Quality in Milling of Aluminum Alloy 6030 Under Minimum-Quantity Lubrication Using Response Surface Methodology and Genetic Algorithm
With the development of manufacturing towards stricter precision requirements and increasingly complex geometric shapes, dimensional accuracy has become a key factor affecting precision engineering components used in many industries. Effective cooling and lubrication methods have always been a…
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Comparative Wear and Friction Assessment of Nano-Additive Lubricants on Diesel Motors
In this study, boron carbide (B4C), hexagonal boron nitride (hBN), holy super graphene (HSG), and hybrid (B4C+hBN+HSG) nano-additives were added to SAE 15W-40 diesel engine oil at a range of 0.03–0.24 g per 30 mL of oil, and reciprocating tribological tests were conducted on a GG25 (EN-GJL-250)…
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Tribological Behavior and Wear Prediction of Copper-Based Brake Pads for Monorail Cranes Under Complex Hygrothermal Environments
A significant amount of frictional heat is generated during the braking process of mine-used monorail cranes under heavy-load and low-speed creeping (or reciprocating speed regulation) conditions, causing thermal softening and performance degradation of the brake pads. Thus, investigating the…
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Research on Load Distribution and Fatigue Life Under Elliptical Deformation of Four-Point Contact Slewing Bearing Rings for Excavators
Excavators are critical equipment in mining, construction, and other fields. The four-point contact slewing bearings used in their slewing mechanisms operate under harsh conditions such as heavy loads and impacts. Furthermore, the bearing rings are prone to elliptical deformation after…
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Numerical Investigation of Gas Film Performance in Face Dry Gas Seals with Combined Micro-Textured Structures
To enhance the load-carrying capacity and operational stability of dry gas seal gas films while reducing gas leakage, and to provide a theoretical basis for structural optimization and innovation of face seals, a numerical model of gas film lubrication in face dry gas seals considering the…
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Lubricating Properties of Oil-Based Solutions Containing Graphene as Additive
Graphene, a 2D carbon allotrope with a hexagonal atomic structure, exhibits an exceptionally low friction coefficient of approximately 0.004, making it a superior alternative to traditional lubricants. This research investigates the performance of graphene as an additive in oil-based lubricants…
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Tribological and Micro-Mechanical Behaviors of Advanced Polyethylene (HDPE) by Radiation
This study examines the tribological and micro-mechanical behavior of high-density polyethylene (HDPE), which has been advanced to the class of advanced polymers through electron beam irradiation (irradiation dose of 33 kGy to 198 kGy). The tribological and mechanical behaviors were analyzed at the…
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A Novel Assessment Model for the Sustainability of Clean Cutting Technology Based on Game Theory
To enhance the sustainability of manufacturing, various clean cutting technologies have been developed, yet their sustainability assessment faces challenges in balancing multiple conflicting objectives and stakeholder interests. This paper proposes a game theory-based evaluation framework that…
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Recent Advances in High-Temperature Tribology
High-temperature tribology is a multidisciplinary science that has evolved rapidly in response to the increasing performance demands of high-technology sectors, including aviation, aerospace, nuclear energy, power generation, and advanced metal forming industries [...]
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Numerical Simulation of Startup Performance in High-Power Diesel Engine Lubrication Systems Under High-Altitude and Cold Conditions
With the significant increase in the number of motor vehicles in plateau regions, the adaptability and reliability requirements of diesel engines operating under high-altitude and cold conditions have become increasingly critical. In this study, a one-dimensional transient simulation model of the…
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Return to the Roots—Experimental Work on Water-Lubricated Bearings with Lignum Vitae Wood Bearing Bushes and Comparison with Other Similar Solutions
The results of experimental tests of six various water-lubricated bearings are described. Tests were performed under conditions typical for marine stern tube bearings. The acquired low-friction coefficient values indicated that the bearings operated in the fluid friction regime over a wide range of…
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Macroscale Superlubricity in Water-Based Systems on Electroless Ni–P Coatings via P-Content Optimization and Tribofilm Control
Electroless Ni–P coatings are widely used for corrosion and wear protection, yet their ability to deliver water-based superlubricity and the role of phosphorus content remain insufficiently understood. Here, electroless Ni–P coatings with four P contents (3.4, 6.4, 9.0, and 12.4 wt%) were deposited…
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Synthesis and Characterization of Trimethylolpropane Esters via Guanidine Carbonate-Catalyzed Transesterification of Sunflower Oil Methyl Esters
This study investigates the synthesis and physicochemical characterization of biolubricant base oils derived from sunflower oil methyl esters (SUNOMEs) via transesterification with trimethylolpropane (TMP) using guanidine carbonate (GNDC) as a green and efficient catalyst. The transesterification…
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The Influence of Misalignment on the Performance of the Herringbone Groove Journal Bearing-Rotor System
Misalignment of the herringbone groove radial bearing can lead to changes in performance and system abnormalities. To investigate the effects of different misalignment modes and magnitudes on the HGJB-rotor system, a coupled dynamic model was established. Based on this model, the influences of…
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Toward Reliable Triboelectric Nanogenerators: Roles of Lubricants
Triboelectric nanogenerators (TENGs) are a newly adopted technology designed to harvest freely available mechanical energy from the environment and convert it into electricity that can help to meet future demands for clean and sustainable energy. TENGs represent a promising next-generation…
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Study on Deformation Characteristics of Hollow Shaft of Grinding Mill’s Sliding Shoe Bearing Based on Fluid–Structure Interaction
The sliding shoe bearing serves as a critical rotary support component in large grinding mills. The deformation of the hollow shaft under operating conditions is a pivotal factor governing the uniformity and stability of the lubricating oil film thickness in sliding shoe bearings. To address this…
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Rotordynamic System-Level Effects of Three-Lobe Journal Bearings Including Manufacturing Variations
This paper examines the impact of pad-to-pad manufacturing variations in three-lobe journal bearings on system-level rotordynamics. Two sources of non-uniform clearance were studied: dissimilar pad clearance and preload. Both were varied independently within standard manufacturing tolerances. The…
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