Fundamentals of Engineering Surfaces

Menezes, Pradeep L.; Kailas, Satish V.; Lovell, Michael R.

doi:10.1007/978-1-4614-1945-7_1

Cited by 21 publications

(10 citation statements)

References 33 publications

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“…This can be caused by the interactions of the asperities as the degree of surface energy can influence the localized adhesion strength. If the adhesions strength is greater than the breaking strength of the neighboring regions, adhesive wear occurs [104,113]. In the case of specimen S5, the wear track is non-symmetrical and, in some regions, does not have the appearance of material loss.…”

Section: Wear Of the Bare And Coated Al6061 Alloysmentioning

confidence: 99%

“…Traditionally, in order to assess the wear resistance of a material, the hardness must be measured as it is one of the major influencing factors of surface strength as per Archard's equation [104]:…”

Section: Wear Of the Bare And Coated Al6061 Alloysmentioning

confidence: 99%

“…This increases the chance of enabling a fatigue wear mechanism of which brittle fractures occur from the buildup of microslips along the contacting asperities. This can increase the potential particle delamination, thus resulting with third-body wear to the system [104,113,114]. As the N 2 process gas temperature increases, the wear mechanism for resultant Zr coatings transitions to a dominant adhesive mechanism.…”

Section: Wear Of the Bare And Coated Al6061 Alloysmentioning

confidence: 99%

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Effect of Gas Propellant Temperature on the Microstructure, Friction, and Wear Resistance of High-Pressure Cold Sprayed Zr702 Coatings on Al6061 Alloy

et al. 2022

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For the first time, Zr702 coatings were deposited onto an Al6061 alloy using a high-pressure cold spray (HPCS) system. In this work, five different N2 process gas temperatures between 700 and 1100 °C were employed to understand the formation of cold sprayed (CS) Zr coatings and their feasibility for enhanced wear resistance. Results indicated that the N2 processing gas temperature of about 1100 °C enabled a higher degree of particle thermal softening, which created a dense, robust, oxide- and defect-free Zr coating. Across all CS Zr coatings, there was a refinement of crystallinity, which was attributed to the severe localized plastic deformation of the powder particles. The enhanced thermal boost up zone at the inter-particle boundaries and decreased recoverable elastic strain were accountable for the inter-particle bonding of the coatings at higher process gas temperatures. The flattening ratio (ε) increased as a function of temperature, implying that there was a greater degree of plastic deformation at higher N2 gas temperatures. The microhardness readings and wear volume of the coatings were also improved as a function of process gas temperature. In this work, the wear of the Al6061 alloy substrate was mainly plowing-based, whereas the Zr CS substrates demonstrated a gradual change of abrasive to adhesive wear. From our findings, the preparation of CS Zr coatings was a feasible method of enhancing the wear resistance of Al-based alloys.

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Section: Wear Of the Bare And Coated Al6061 Alloysmentioning

confidence: 99%

Section: Wear Of the Bare And Coated Al6061 Alloysmentioning

confidence: 99%

Section: Wear Of the Bare And Coated Al6061 Alloysmentioning

confidence: 99%

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Effect of Gas Propellant Temperature on the Microstructure, Friction, and Wear Resistance of High-Pressure Cold Sprayed Zr702 Coatings on Al6061 Alloy

et al. 2022

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“…As explained in the book Tribology for Scientists and Engineers, tribology is defined as the science of studying friction and wear from two contacting surfaces [36]. Through the accumulation of references from published studies from Menezes et al, this work acts as a building base for the concepts that will be discussed in this review.…”

Section: The Importance Of Tribological Property Alterations In Addit...mentioning

confidence: 99%

Tribological Properties of Additive Manufactured Materials for Energy Applications: A Review

2020

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Recently, additive manufacturing (AM) has gained much traction due to its processing advantages over traditional manufacturing methods. However, there are limited studies which focus on process optimization for surface quality of AM materials, which can dictate mechanical, thermal, and tribological performance. For example, in heat-transfer applications, increased surface quality is advantageous for reducing wear rates of vibrating tubes as well as increasing the heat-transfer rates of contacting systems. Although many post-processing and in situ manufacturing techniques are used in conjunction with AM techniques to improve surface quality, these processes are costly and time-consuming compared to optimized processing techniques. With improved as-built surface quality, particles tend to be better fused, which allows for greater wear resistance from contacting tube surfaces. Additionally, improved surface quality can reduce the entropy and exergy generated from flowing fluids, in turn increasing the thermodynamic efficiency of heat-transferring devices. This review aims to summarize the process-optimizing methods used in AM for metal-based heat exchangers and the importance of as-built surface quality to its performance and long-term energy conservation. The future directions and current challenges of this field will also be covered, with suggestions on how research in this topic can be improved.

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“…The oil lubricants include harmful substances such as polycyclic aromatic hydrocarbons or contaminants such as cadmium, zinc, arsenic, mercury, and chlorine. Self-lubricating composites cause a lower usage of toxic petroleum-based lubricants and higher energy economization in industry and consequently, as a promising approach for a green world [1][2][3]. These composites have a simpler manufacturing process and are made of cheaper materials.…”

Section: Introductionmentioning

confidence: 99%

Hybrid PTFE-glass hierarchical braided/epoxy composites with self-lubricating and high tribological performance

Zahabi

Sheikhzadeh

Akbarzadeh

et al. 2020

Journal of Industrial Textiles

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In this study hybrid polytetrafluoroethylene (PTFE)/glass fibers were employed in hierarchical braided structure as a composite reinforcement. PTFE-covered glass fibers were braided to achieve the hierarchical structure, then the composites were prepared through vacuum assisted resin transfer molding (VARTM) process. Tribological experiments were performed on the composites. The results showed self-lubricating and lower dynamic friction coefficient due to the PTFE transfer film formation. SEM micrographs confirmed the transfer film formation. Friction coefficient of 0.112, 0.105 and 0.096 were obtained under loading of 20, 30 and 40 N forces, respectively. The experimental coefficient of friction results were confirmed by mixture theory. The self-lubricating feature of PTFE-glass braided epoxy composite along with its mechanical characteristics makes it a feasible alternative for traditional wet bearing parts.

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Fundamentals of Engineering Surfaces

Cited by 21 publications

References 33 publications

Effect of Gas Propellant Temperature on the Microstructure, Friction, and Wear Resistance of High-Pressure Cold Sprayed Zr702 Coatings on Al6061 Alloy

Effect of Gas Propellant Temperature on the Microstructure, Friction, and Wear Resistance of High-Pressure Cold Sprayed Zr702 Coatings on Al6061 Alloy

Tribological Properties of Additive Manufactured Materials for Energy Applications: A Review

Hybrid PTFE-glass hierarchical braided/epoxy composites with self-lubricating and high tribological performance

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