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.
A steel ball was slid on aluminium-silicon alloys at different temperatures. After the coefficient of friction had been measured, the surface shear stress was deconvoluted using a two-term model of friction. The ratio of surface shear stress to bulk hardness was calculated as a function of temperature, silicon content and alloying additions. These results are qualitatively similar to those recorded...
Wear behaviour of as-cast and heat-treated spheroidal graphite (SG) cast iron has been studied under dry sliding conditions using a pin-on-disc type apparatus. Wear tests were carried out at a linear sliding speed of 0.88 m s -1 , under a constant load of 1.5 kg. All tests were performed in ambient air at room temperature. Extent of wear damage and wear mechanisms were investigated by...
Dry sliding of zirconia toughened alumina (ZTA) and monolithic alumina against steel has been studied, using a pin-on-disc machine as a function of speed, in the speed range of 0.1–12.0 m s −1 , at a pressure of 15.5 MPa. Both the materials show four types of frictional behaviour, controlled by the type and extent of the interface layer formed. At low speeds the interface layer is composed...
Friction behaviours of sintered high speed steels containing TiC, CaF 2 and MnS additives and lubrication mechanisms of these additives have been investigated at sliding conditions at 600°C. Results shown that these additives strongly affected friction behaviours of the sintered high speed steels. Ceramic carbide TiC, as a bonding agent and enhancement phase, bonded the solid lubricant CaF...
The friction and wear behavior of sliding bearings made from high temperature thermoplastics was investigated to determine the possibility of dry sliding applications. A test apparatus for plain bearing testing was designed and built to enable load, speed, and temperature to be controlled and temperature, friction and wear to be continuously monitored.Bulk material bearings (polyaryletherketone-based...
The effects of cerium, zinc and zirconium additions and subsequent heat treatment on wear of the eutectic aluminium-silicon alloys have been investigated in dry sliding against a steel counterface by using a pin-on-disc machine. Wear surfaces and debris were examined by scanning electron microscopy. Wear characteristics of both binary Al-Si alloys and a commercial LM 13 alloy, were also studied and...
The tribological behavior of Cu-20%Nb and Cu-15%Cr in situ composites was studied on a pin-on-disk tester. Composite pins were slid against a hardened AISI 52100 steel disk under dry ambient conditions. Comparison of coefficient of friction, wear rate and bulk temperature was made between the two composites in terms of effects of normal pressure and sliding speed. Microstructural changes in the composites...
The Cu-15 vol.% Cr in situ composite is a promising material for the electrical contacts in high current devices, since it has an excellent combination of mechanical strength and electrical/thermal conductivity. The electrotribological behavior of Cu-15 vol.% Cr was studied using a modified pin-on-disk tester with an electrical current applied across the sliding interface. The Cu-15 vol.% Cr pins...
The dry sliding behaviour of the Ti6Al4V alloy was studied in order to highlight the mechanisms responsible for the poor wear resistance in different load and sliding speed conditions. By increasing the sliding speed, a transition from oxidative wear to delamination occurs with a corresponding minimum in the wear rate. This minimum shifts towards lower speeds by increasing the load.The results were...
The steady-state wear of aluminium alloy AA6061 and AA6061-based Saffil fibre-reinforced composites, manufactured by a PM route, was investigated with a pin-on-disc configuration under dry sliding conditions. Using a constant sliding velocity, the-wear rates of the monolithic alloy and the composites increased proportionally with the applied load. The benefit of Saffil reinforcement at volume fractions...
The wear resistance of MMCs can be improved by increasing the volume fraction of the reinforcing ceramic phase (HRC) by as much as 70%. Among the various types of HRC composites, a new Al 2 O 3 -Al co-continuous ceramic/metal composite (referred to as C 4 composite) has been recently produced at The Ohio State University. A new method of preparation, based on a displacement...
This paper presents a study of the machining effect on tribological properties of ultra high molecular weight polyethylene (UHMWPE) in terms of coefficient of friction and wear factor under dry reciprocating sliding conditions. Machining parameters include cutting speed, feed rate and depth of cut. Polymeric structure of the semicrystalline polymer was characterized using differential scanning calorimetry...
Friction and wear tests were carried out using five kinds of pins (Ag, Ti, Mo, Stainless steel 303, and WC) against a TiC-based cermet disk at four kinds of loads (2.5-10 N) under unlubricated conditions in a vacuum. A topographical analysis was also performed on the micro-asperities of the wear surfaces to estimate the behavior of the wear particles, the degree of surface damage and the wear rate...
In the present study, samples made of AISI 4140 steel pre-treated with plasma nitriding and coated with different PVD coatings (TiN, TiAlN and ta-C) were investigated in terms of their microhardness, surface roughness, scratch adhesion and dry sliding wear resistance. Wear tests, in which duplex-treated pins were mated to hardened ball bearing steel discs, were performed with a pin-on-disc machine...
The influence of Ti addition (up to 4wt.%) on wear behavior of as-cast and heat-treated Al-12wt.% Si eutectic alloy prepared by rapid cooling has been investigated in dry sliding against a steel counterface using a pin-on-disk apparatus. Worn surfaces and wear debris were examined and analyzed by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction...
Analytical solutions were developed for the temperature rise distribution for the classical case of a tribological sliding system due to frictional heat source at the interface. The sliding system is approximated initially to an infinitely long band heat source with uniform distribution of heat intensity. Since the partition coefficient between the stationary and the moving bodies (relative to the...
The main objective of this paper is to help on the clarification of the lack of consensus in the bibliographic data concerning the tribological behaviour of Si 3 N 4 -BN composites. Unlubricated sliding tests by pin-on-disc were carried out with three grades of composite materials with 10, 18 and 25vol.% of BN. The addition of BN to the Si 3 N 4 matrix resulted in a...
Models for oxidation-modified wear in two phase materials have been proposed extending the earlier models of Archard and Quinn, for predicting the oxidative wear in homogeneous materials. Three distinct possibilities have been considered-(a) case A, both the phases having the same oxidation behaviour and also, the same critical thickness for oxidative wear; (b) case B, both the phases having the same...
Recently, a low-friction effect with friction coefficients of below 0.2 against ball-bearing steel has been reported for chlorine-containing TiN coatings grown by plasma-assisted chemical vapor deposition (PACVD). This low-friction effect has been attributed to the formation of a chlorine-containing lubricant layer on top of the coating in humid air which can be regarded as a self-adaptation process...
A great deal of research has been conducted to clarify the role of oxide films in the wear of metals. Oxides formed during dry sliding of steels at high temperatures determine their tribological behavior. The present work deals with the influence of the oxide-forming alloying elements aluminum and silicon on the oxidation and wear of three selected hot work steels. For this investigation, ball-on-disc...
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.