The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper is aimed to characterize the new NiCrAlMo-12.5wt. % Ag- X wt. % CaF2/BaF2 (X = 5 or 10) solid-lubricating composites, which have high strength and self-lubricity simultaneously from room temperature to 800°C and thus would be a potential candidate for aerospace bearing applications. Additionally, clarification of the influence of fluoride content on the tribological responses of this material...
Marine water-lubricated bearing is the key part of the thrust shafting of underwater vehicles and some surface vessels, that is currently made with rubber, Thordon, Feroform, nylon, lignumvitae materials etc. Because the performance of vibration and noise reduction of the rubber material is better than some materials so that it is usually applied in water-lubricated propeller shaft bearing of submarines...
High temperature solid lubricating materials show important demands in applications for moving machine assemblies under extreme operating conditions. In this study, the tribological behavior of a nickel-alloy based self-lubricating composite (82.5%nickel-alloy–12.5%Ag–5%BaF2/CaF2) against Si3N4 ball was evaluated under various temperatures and sliding speeds. Results showed that the friction coefficient...
The tribological behavior of nanocrystalline Fe88Si12 alloy in vacuum environment has been investigated compared with coarse grained counterpart. The results demonstrated that the friction coefficient of the Fe88Si12 alloy reduced with the decrease of both grain size and oxygen partial pressure. The wear resistance of the Fe88Si12 alloy improved more effective in vacuum than in air as the grain size...
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...
In this study, we report that a layered Ti 3 AlC 2 ceramic exhibited three distinct tribological behaviors at different vacuum degrees. It is firstly found that the layered Ti 3 AlC 2 exhibited intrinsic self-lubricity under vacuum degree from 2.0×10 4 to 5Pa with the coefficient of friction (CoF) as low as 0.2 and nearly no wear. Under lower 0.1Pa and air atmosphere,...
NiAl, NiAl–Cr–Mo alloy and NiAl matrix composites with addition of oxides (ZnO/CuO) were fabricated by powder metallurgy route. It was found that some new phases (such as NiZn 3 , Cu 0.81 Ni 0.19 and Al 2 O 3 ) are formed during the fabrication process due to a high-temperature solid state reaction. Tribological behavior was studied from room temperature to...
The mechanical properties and wear behavior of an Fe 70 Ni 30 alloy with twinned martensite structure obtained by deep cryogenic treatment at −196°c (DCT) were evaluated in comparison with that of coarse-grained (CG) Fe 70 Ni 30 alloy (single austenite phase). The results showed that after the introduction of martensite with nano-scale twins, the Vickers hardness of...
Dry-sliding tribological performance of the Fe–28Al–5Cr and its composites containing 15, 25, 35, 50wt.% TiC, produced by hot-pressing process, was investigated against an AISI 52100 steel ball in ambient environment at varying applied load and sliding speed. It can be found that the coefficient of friction (COF) is irrespective of TiC content and applied load, but increases from 0.46 to 0.60 with...
Reinforced polyamide 6–polyurethane (PA6–PU) block copolymers with different short glass fiber proportions were prepared by monomer casting (MC) technology. The mechanical and tribological behaviors of the reinforced composites were studied. The friction and wear experiments were tested under ambient conditions in a friction machine with the chromium steel ball sliding on the surface of the composites...
The tribological properties of the nano-eutectic Fe 1.87 C 0.13 alloy are investigated under dry-sliding against AISI52100 steel ball in ambient environment with varying applied load and sliding speed. As comparison, the tribological properties of the same alloy after annealing treatment, which is with coarse-grained microstructure, also are examined at the same testing condition....
The tribological properties of a Fe 3 Al material in an aqueous solution of 1mol/l H 2 SO 4 corrosive environment sliding against a Si 3 N 4 ceramic ball are studied using an Optimol SRV oscillating friction and wear tester in a ball-on-disc contact configuration. We investigate the effects of load and sliding speed on tribological properties of the Fe 3...
The lamellar structure determines mechanical properties of a thermal spray coating. A model for the erosion of thermally sprayed ceramic coatings resulting from the debonding of flattened ceramic particles is proposed based on the examination of the erosion mechanism. The relationship between erosion rate and microstructural parameters is established both experimentally and theoretically to reveal...
The tribological properties of FeAl intermetallics under dry sliding against AISI52100 steel at ambient conditions were studied on an Optimol SRV oscillating friction and wear tester in a ball-on-disc contact configuration. Effects of load and sliding speed on tribological properties of the FeAl intermetallics were investigated. The worn surfaces of the FeAl intermetallics were examined with a scanning...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.