Papers by Keyword: Anti-Wear

Abstract: Weight reduction in automotive and aerospace components can improve energy efficiency, reduce emissions, and increase performance. The adoption of light metals such as aluminium, magnesium and titanium alloys, is essential to these performance improvements; however, these alloys require protective surface coatings to prevent corrosion and resulting mechanical failures during service life. Traditional protective coatings for light-weight materials can be costly in terms of energy, raw materials, and environmental sustainability. New durable coating approaches are required to allow light-weight materials to be fully exploited in high performance applications. Novel Cirrus HybridTM coatings, a recent innovation in surface finishing, can protect a wide range of light metal alloy components using a sustainable, non-toxic process. Cirrus HybridTM coating technology deposits a thin-film, inorganic coating that bonds tightly to the light-metal alloy substrate. The process is energy efficient, does not rely on hazardous chemicals, and is up to 5 times thinner than traditional coatings for light metals. A Cirrus HybridTM coating provides excellent anti-corrosion, scratch, and wear properties, along with superior tribological, electrical, and optical performance. This paper updates the art of these innovative new coating technologies for reducing weight in industrial components without compromising functionality or performance.

Abstract: One oil soluble zinc oxide nanoparticles were prepared by surface-modification method. Its tribological performance was evaluated by four-ball test, SRV Friction-Wear Test and Mini-Traction machine, its oxidation resistance estimated by Rotating Pressure Vessel Oxidation Test and Pressurized Differential Scanning Calorimetry, all these study were contrast with ZDDP in base oils and API SM Gasoline engine oil. As a result, nanozinc oxide has good anti-oxidative capability, excellent anti-wear properties, In API SM Gasoline engine oil, the comprehensive Performance of nanoZnO additive substitution ZDDP is similar to ZDDP, in particular friction and antioxidative properties, nanoZnO in more outstanding than ZDDP. These results showed that zinc oxide nanoparticles were a kind of good performance lubricanting oil additives.

Abstract: Lizardite were synthesized by hydrothermal reaction in an Fe³⁺ doped solution/environment using nanometer SiO₂ and MgO as precursors. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR). The results show that: the synthetic samples are lizardite with a thickness ranging from 60 nm to 200 nm in the temperature range 200°C~230°C.

Abstract: Tribology performances (friction and anti-wear) of aqueous symmetrical tri-block normal and reverse copolymer solutions have been investigated. The ball-on-disk experiment was carried out to measure the coefficient of friction of solutions used at ~25°C and ~50°C. The interaction of alkyl phosphate ester, an anionic surfactant, and the aqueous copolymer solutions was also investigated. When solution was supplied at ~50°C, high friction and severe wear were found indicated that the solutions were not able to protect the surface. The friction and the anti-wear was found to improve when solution used at ~25°C. However, adding alkyl phosphate ester as extreme pressure additive into aqueous solutions produced a stronger adsorbed lubricant film protecting the surface. Low COFs were obtained from solutions below and above the cloud point. For the wear volume, the presence of phosphate ester produced comparable wear with the solution without added alkyl phosphate ester. The stainless steel was found less reactive to the alkyl phosphate ester hence the wear not much reduced. The possible lubrication mechanism is discussed by analysing the worn tracks using Scanning Electron Microscope (SEM), Atomic Force Microscope (AFM) and the water contact angle measurements.

Abstract: The graphite/CaF₂/TiC/Ni-base alloy composite coating was prepared on the surface of 45 carbon steel by plasma spray. Effects of loads, friction counterparts and lubricants on the tribological properties of the composite coating were investigated. The results show that the wear rate of the GCTN composite coating against Si₃N₄ is 0.67×10^-3mm³/m, which is about 2 times that against GCr15 steel, because Si₃N₄ induces micro-cutting wear of the composite coating. Water and NaCl solution may induce increasing of friction coefficients and wear rates. Especially, wear rate of the GCTN composite coating in NaCl solution is increased by 3.1 times compared with those under dry sliding and water. The GCTN composite coating presents better anti-wear property than Ni-base alloy coating in different environmental mediums.

Abstract: The SiO2 nanoparticles were synthesized with a ydrothermal method and modified by oleic acid. The tribological properties of the modified SiO2 nanoparticles as bricating oil additives are studied by friction test. It was found that the nanoparticles as additives in lubricant oil can effectively improve anti-friction and anti-wear roperties. The anti-friction and anti-wear mechanisms were discussed and the lubricating effect of SiO2 nanoparticles can be attributed to rolling effect and self-repairing effect of mechanism.

Abstract: The combination of ship gas turbine working at special environment, this article pass through the study of base oil and composite additive, developed an application marine environment of the ship gas turbine reducer lubricants. According to comprehensive performance assessment, the product has excellent high-temperature anti-oxidant, anti-wear, corrosion inhibition and anti-foam performance. The indicators have reached the requirements. With the development of China's ship gas turbine technology, especially UGT25000 ship gas turbine technology is imported from Ukraine, as well as the recent introduction of the GE LM2500 + G4 Series of technology for power plant of construction. The localization of the supporting facilities are growing louder, there is a strong market rigid demand. Ship gas turbine must be one of the trends of the development of Marine Power. Ship gas turbine due to light weight, small size, stand-alone power, fast start; less pollution, vibration, high thermal efficiency and gas initial temperature, it is easy to realize the cascade of energy use, economy, received widespread attention and application. China's ship gas turbine of modification and design draw the aero-engine, ship gas turbine is a continuous rotation of the impeller mechanical heat engine; it is mainly composed by three parts of the compressor, gas generator and gas turbine. Ships generally use diesel (fuel have heavy trend, the heavy diesel oil or No. 200 heavy oil will be used) as fuel, in order to adapt the ship gas turbine, ship gas turbine need to transform, particularly its' lubrication system [1]. Foreign aviation gas engine lubricants are based on the U.S. standard as a reference, due to the differences of using purpose and fuel, so that the ship gas turbine oil has different requirements. Since ship gas Turbine Technology started late in China, the ship gas turbine core engine technology patents come from the United States, Russia and Ukraine, so the use of gas turbine lubricants, as well as matching accessories and other standards, which are more or less directed reference to refer to the original foreign standards [2,3]. We have never been established using standard ship gas turbine oil. Ship gas turbine apply to the special conditions (high humidity, salt spray, etc.), the ship gas turbine of lubrication has a higher demand, particularly for the ship gas turbine reducer of lubrication. The ship gas turbine reducer work in the low-speed heavy-duty and high-speed heavy-duty , high strength, high shear conditions, how ensure the ship gas turbine reducer to normal work is very important at high load conditions. In this regard, developing of a ship gas turbine reducer lubricant is very necessary.

Abstract: A serious of nitride coatings including chromium, titanium and aluminum are deposited on the glass and stainless steel by Closed-Field unbalanced magnetron sputtering. The friction coefficient is measured by tribolometer and the wear traces of the coatings can be studied by the optical micrographs, those indicate that the friction coefficients of TiN、 CrN、TiAlN、CrAlN and CrTiAlN decrease sequentially as well as the anti-wear of the coatings can be enhanced. According to X-ray photoelectron spectroscopy analysis for the coatings, aluminum nitride can be indentified in the nitride coatings with Al element, which enhances the hardness and anti-wear performance of the coatings. The chrome oxide can be found in the nitride coatings with Cr element, which enhances the self-chip removal ability of the coatings and decreases the friction coefficients of the coatings; titanium oxide existing in the coatings is not good for the friction and anti-wear of the coatings. Chromium titanium aluminum nitride naturally is of higher hardness than the ternary nitride, as well as Chromium and aluminum in the coatings is in favor for the low friction coefficient and good anti-wear property.

Abstract: Oleic acid capped copper nanoparticles were prepared by the solventless thermolysis of single-source precursor, cupric oleate. OA-capped Cu nanoparticles were characterized by means of FT-IR, TEM, XRD and TGA. Results show that OA-capped Cu nanoparticles with an average diameter of about 40 nm, which are able to prevent water adsorption, oxidation and are capable of being dispersed stably in organic solvents or mineral oil. This approach offers a great deal of facilitating their production without the need of protection by inert gases or sealed containers. In this process, only the preparation condition temperature has an obvious effect on the size and component of the product. OA-capped Cu nanoparticles as an additive in PAO10 perform good anti-wear and friction-reduction properties. As the additive concentration reach to 0.5 wt. %, the wear scar diameter can be reduced by 18 % and the friction coefficient can be reduced by 13 % as compared to pure PAO10.

Abstract: 65Mn spring steel is mainly used for rotary blade which is a vulnerable part of farming machinery. The experiment of the wear-resistance property for 65Mn spring steel under different heat treatments is conducted. The results are discussed based on the regression orthogonal design. The wear-resistance property of 65Mn steel has been discussed by applying diverse heat treatment technology and the optimum parameters of heat treatment for the best anti-wear property are obtained through experiments. The influence of the parameters on anti-wear property is studied by applying the regression orthogonal design. The relation between the wear mass loss and diverse heat treatment parameters has been given by using planar and contour figure. The optimum heat treatment parameter for maximum anti-wear ability is obtained as following: 852.64 for quenching temperature, 18.36min for quenching time, and 145.44 for tempering temperature, respectively.