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Scuffing damage is catastrophic and typically not self-healing. It severely affects the life and reliability of engineering components, such as cams, roller bearings, piston rings, cylinder bores and gears. Gray iron and 1080 steel are important materials for these extremely demanding structural components. There have been several scuffing studies done in the past with various types of steel and cast...
In this paper, the microstructures of Cr–Mo–Cu alloy cast irons with and without nano-additives were characterized by scanning electron microscope (SEM) and energy diffraction spectrum analyser (EDS). The dry sliding wear tests were carried out using a pin-on-disk wear tester against GCr15 steel balls under fixed normal load and rotating velocity. The study aimed to illustrate the effect of graphite...
In this work, in order to prepare expanded graphite (EG) and acrylonitrile-butadiene rubber (NBR) composites, two preparation methods were adopted, namely directly mechanical blending (micro-composites) and latex compounding technique (nanocomposites), and their resulting mechanical and tribological properties were compared. Meanwhile, the effects of the graphite dispersion state, volume fraction,...
The friction and wear performance of pure polyamide-6 (PA-6), 5wt%, 15wt% graphite filled polyamide-6 and 4wt% wax filled polyamide-6 (PA-6+4% wax) sliding against stainless steel under dry sliding conditions were studied using a pin-on-disc tribometer. The influences of filler type, content, applied load and sliding speed on tribological properties were investigated. Tests were carried out at sliding...
Loose powder is used to lubricate the tribopair with the replenishing mechanism. This work analyzes the contact and the damage behavior of the powder layer during powder lubrication. The typical life cycle of a powder layer includes the full powder layer, partial detachment, serious detachment, and complete destruction, which can be concluded from the powder layer images. The carbon and copper content...
Bronze matrix composites were prepared by the powder metallurgy technology (P/M). The tribological properties of composites sliding against AISI321 stainless steel pins were studied under sea water condition. The alumina had a strengthened effect on the hardness and wear resistance of composites, but it increased the friction coefficient of bronze material. The nickel coated graphite improved the...
The present study aims at investigating the tribological behavior of polyphenylene sulfide (PPS) composites in water lubricated sliding contact against a metallic (Inconel) counterpart. Factorial combinations of three commercially available carbon based fillers namely short carbon fibers (SCF), multi-walled carbon nanotubes (MWNT) and graphite (Gr) were utilized as single, dual- and multi-modal reinforcement...
The process of machining of hard materials such as titanium and its alloys, has an important role in the development of new machining techniques, such as cutting tools and coatings, with the aim to increase the machinability of these materials. Due to the poor thermal properties of the titanium, the cutting tool suffers accelerated wear which affects the tool life. This paper describes a study of...
Effect of running-in process on friction behavior of graphite sliding against cemented carbide in deionized water was investigated using a standard tribometer Plint TE92 in a ring-on-ring contact configuration. A stable and ultralow friction coefficient of about 0.003 between graphite and cemented carbide rings was obtained after a three-step friction test method: Step 1 was rapid pre-sliding at standard...
SU-8, an epoxy-based polymer, is industrially very useful material for fabricating microsystems such as micro-electro-mechanical systems. However, for optimal performance, it is necessary to further improve the mechanical and tribological properties of SU-8. Different weight percentages (wt%) of graphite and talc particles are added to SU-8 for the enhancement of mechanical as well as tribological...
The sliding performance of PEEK materials against steel discs was investigated in air, vacuum and hydrogen environment. PEEK compounds were filled with graphite flakes, CNTs or TiO2 particles. Results indicate that pure PEEK is environmentally sensitive. Desorption of gases in vacuum leads to weakening of the polymer, inducing high wear rate in vacuum condition. Very low friction is obtained with...
This study aims at revealing the mechanisms of how matrix type and lubricant content affect the lubricating properties of graphite doped self-lubricating composites. Self-lubricating mechanism and tribological properties of three kinds of lubricating materials having different matrix-types (copper alloy, zirconia and alumina) are investigated. Results show that the effect of matrix type on the friction...
In the last two decades, severe regulations on fuel consumption, gas emissions and product recyclability have driven the attention of the automotive industry to the use of high-strength aluminium alloys to manufacture lightweight structural parts of the car body-in-white. To overcome the low formability and springback when these alloys are formed at room temperature, new high temperature forming processes...
Gray cast iron is widely used in diesel automotive engines due to its combination of low cost and good fusibility, but also to the presence of graphite flakes in their microstructure. Besides their role as mechanical dampers, graphite flakes can act as solid lubricant, reducing friction and wear of moving components. Surface texturing has been intensively investigated in recent years to improve lubrication...
The production of self-lubricating composites containing second phase particles is one of the most promising choices for controlling friction and wear in energy efficient modern systems. To gain a better understanding of the wear behaviour of such materials, Fe-Si-C matrix composites containing solid lubricants added during the mixing step were studied in this work. The samples were produced using...
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