Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"anti-wear"”.
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Tribopolymerization: Anti-Wear Behavior of New High Temperature Additive Classes
… evaluated new high-temperature classes of anti-wear additives. The work involved experiments on steel and alumina material pairs with a pin-on-disk tribometer used to explore the anti-wear capabilities of selected additives in the liquid phase at concentrations of 1% by weight in …
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Analysis of the Tribological Behaviour of Stainless and Ball Bearing Steels Sliding in the Presence of Sulphur Extreme-Pressure Additives
… steel were studied under extreme pressure and/or anti-wear lubrication conditions in the presence of sulphur and sulphur containing additives, in order to compare the wear behaviour of the AISI 420 stainless steel with the SAE 52100 steel, taking into account the influence of chromium in both …
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A new approach to ceramic lubrication: tribopolymerization
… zirconia ceramic systems. Results showed that wear reductions of alumina by up to 80% were achieved at room temperature. At elevated temperatures (up to 150°C), the monomers were also effective; one of the monomers reduced wear by over 90% at higher temperatures. In the zirconia system, the …
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Investigating The Relationship Between Surface Topology And Functional Characteristics For Injection Moulded Thermoplastic Components
… to transmit and adhere, and can be resistant to antibiotics. They also evolve over time to survive in harsh environmental conditions. Current research reveals that design of plastic surfaces containing submicron structures, is becoming a popular approach to tackle issues concerning infection …
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Tribopolymerization as an approach to two-stroke engine lubrication
… on rubbing surfaces to reduce damage and wear by the use of minor concentrations of selected compounds capable of forming polymeric films in situ[12]. Two monomers were investigated as potential anti-wear compounds, namely (a) Cas dimer acid/ethylene glycol monoester, a condensation …
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Pretreatment of Small Four-Stroke Engine Components for No-Oil Hot Tests
… on rubbing surfaces to reduce damage and wear by the use of minor concentrations of selected compounds capable of forming polymeric films in situ. This study entailed the investigation of the anti-wear properties of the formulated lubricants on a high temperature pin-on-disk machine and …
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Tribopolymerization: ceramic lubrication under high loads and high speeds
… to determine the effects of load and speed on wear reduction. At low speeds, the monomers showed significant wear reductions, from 37 percent up to 98 percent, compared to pure hexadecane lubrication. Changes in load at low speed had mixed effects dependent on the monomer. At high speeds, the …
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Development of a multi-regime tribometer and investigation of zinc dialkyldithiophosphate tribofilm development in the presence of overbased calcium sulfonate
… the production of nano-scale films from the anti-wear additive zinc dialkyldithiophosphate (ZDDP). The tribometer was designed to operate in various conditions of lubrication severity, from boundary to hydrodynamic lubrication regimes. A cylinder-on-plate layout, in which a cylinder rotates …
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Towards a universal ultra-thin fluorinated diamond-like carbon coating for nanoimprint lithography imprinters
… carbon (F-DLC) has proven to be a successful anti-adhesion layer but in the past has required an entire diamond-like carbon (DLC) substrate. The requirement that the imprinter be made of DLC limits the imprinter processing and can limit the capabilities of NIL. DLC films are considered to be …
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Tribology of engineering and coated materials in the presence of environmentally friendly refrigerant
… specific loading conditions. However, beneficial anti-wear tribofilms were shown to evolve throughout this process as revealed via Scanning Electron Microscopic (SEM) analysis. Energy Dispersive Spectroscopy (EDS) in conjunction with X-ray Photoelectron Spectroscopic (XPS) analysis identified the …
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Incident-response monitoring technologies for aircraft-cabin air quality
… incidents. Tri-cresyl phosphate (TCP), a common anti-wear additive in turbine engine oils, is an important component in today’s global aircraft operations. However, exposure to TCP increases risks of certain adverse health effects. This research analyzed used aircraft cabin air filters for jet …
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A study of the friction of the power cylinder system in internal combustion engines using a floating liner engine
… as results from testing the effects of select anti-wear additives in the oil. The results identify new developments related to lubricant/additive effects on the liner surface, and how these effects can influence friction.
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The effect of base stock and additive packages in an automotive oil on the friction and wear behaviour of overhead camshaft and finger follower systems
… this in turn however, has caused increased wear problems. In order to understand the tribological behaviour of overhead camshaft systems, test engines and dynameter test methods have been extensively used. These are however, time consuming and expensive, a cheaper and quicker method of …
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A tribological study of a detonation gun coating of tungsten carbide for use in a subsea gate valve
… widely recognised as one of the most effective anti-wear coatings for oilfield applications. However, very little fundamental tribological information exists for the material, which hinders coating development and the evolution of correct specifications. This study redresses this problem by …
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Development of nano composite coatings for enhanced performance in non-conventional lubricants under sliding contact.
… The extensive investigation of material wear and friction properties of the next generation of refrigerants used in mechanical applications is incomplete. The in-use durability performance of these products have to be accessed from the viewpoint of sustainable development. …