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.
Tribological properties of amorphous and crystalline cordierite (magnesium aluminosilicate) were studied under conditions of oscillating sliding contact against Al 2 O 3 in various liquid media. The tests were conducted using a ball-on-block tribometer at air with varied humidity and in distilled water as well as aqueous hydrochloric and caustic soda solutions with varied concentrations...
This paper describes a study of the erosion of a polymer-particle coating system by a water jet apparatus. Modified versions of two established wear models were applied to this system; these were based on a simple hardness controlled abrasion model and a bulk toughness controlled abrasion model. The mechanical properties of the coatings were modified and their bulk properties were characterized using...
This paper describes the room temperature tribological characteristics of nanocrystalline zinc oxide (ZnO) films. The films were grown onto 440C stainless steel substrates by pulsed laser deposition (PLD) using the 248 nm line from an excimer laser to ablate a hot pressed hexagonal ZnO target. The substrate temperature and oxygen partial pressure were varied to grow films with different stoichiometries...
Fretting situations are becoming increasingly important for industrial applications. Numerous studies have been undertaken to understand the damage created by low-amplitude reciprocating motion, particularly in the case of a ball on flat contact in dry conditions. The loading condition of materials can be characterized by a running condition fretting map which describes, in a graph of normal load...
Various layers of zirconia, coated on cast iron plates and steel discs by plasma spraying, were studied to gain a better understanding of their tribological behaviour. Coatings selected for this investigation were zirconia-5% CaO, zirconia-8% yttria, zirconia-20% yttria and alumina-zirconia coatings. Wear tests were conducted under conditions of dry contact with reciprocating motion at a temperature...
This project was undertaken to achieve three principal objectives: to improve understanding of the behavior of selected aluminum-based bearing materials used in sliding applications, to develop improved guidelines for the design of such bearings, and to respond to increasing environmental concerns about the use of lead in bearing materials.Unlubricated sliding tests have been conducted using disks...
Currently, research on the wear map has been gaining more and more attention from tribologists and has led to the creation of a new research area of wear. In this paper, the wear behaviors (wear mechanisms, surface morphology characteristics and wear rates) of Cr ion implanted pure iron lubricated with liquid paraffin in a large range of sliding speed and load were studied. On this basis, a wear map...
An experimental approach using a modified four-ball machine was used to investigate the rolling-contact fatigue (RCF) performance of tungsten carbide cobalt (WC-12%Co) coatings deposited by the high-velocity oxy-fuel (HVOF) process. The coated rolling-elements were in the geometrical shape of a cone which replaced the upper ball of the modified four-ball machine. The RCF tests simulate the configuration...
In this study, the frictional behaviour and wear of a nickel-based alloy, N80A, as a function of partial pressure of oxygen in a mixture of oxygen and argon at temperatures to 600°C, were investigated on a pin-on-disk reciprocating sliding wear machine. At temperatures below 250°C, a maximum was observed in the relationship between wear and partial pressure of oxygen in the environment. However, at...
The sliding wear mechanisms of cemented carbide and the effects of the microstructure scale on the wear resistance were investigated by performing a series of unlubricated sliding wear tests in air with pins of WC-Co composites sliding against silicon nitride disks. In the first approximation, the wear rate is proportional to the hardness with a wear coefficient k = 6.9 10 -6 for all...
This paper describes the results from an experimental investigation of the effects of operating temperature on the dry sliding friction and wear performance of a short carbon-fiber-reinforced (SCFR) polyetheretherketone (PEEK) composite. The sliding experiments were carried out on a pin-on-disc tribometer at selected temperatures in the range of 20-225°C. The contact configuration used was a stationary...
Principles for evaluation of the abrasion resistance of thin coatings are discussed. In addition to the most obvious way of measuring the wear resistance of thin films, i.e. from shallow wear scars, two basically different principles can be distinguished to evaluate the wear resistance of a coating independently of the substrate: either the coating and the substrate are worn down together and their...
A number of parameters for characterizing the angularity of particles have been proposed in the literature. These parameters serve as good indicators of irregularity as opposed to roundness, but fail to provide a good measure of angularity. The relevant parameter in erosion is angularity and not irregularity. In this work, a new parameter for characterizing the angularity of particles is proposed...
In order to predict the ability of a material to support the load applied at asperities, the flow stress of the surface regions must be known. However, there is little quantitative data on the work hardening behaviour resulting from plastic sliding contact. Both linear hardening and the achievement of a saturation flow stress have been predicted. Two binary Al alloys, Al-4wt.%Cu and Al-11.7wt.% Si,...
The arc erosion behavior of Cu-15%Nb and Cu-15%Cr in situ composites was studied for both low-energy make-and-break contact and a high-energy stationary arcing gap configuration. For low-energy make-and-break contacts, a computerized test set-up was developed, while the high-energy pulsed power stationary arcing tests were performed in the Mark VI facility at Texas Tech University, Lubbock, TX. The...
This paper discusses the results of tribological investigations of composite coatings on a copper-graphite powder base with up to 25 mass% of non-metallic antifrictional filler. The influence of the composition and structure of the thin coatings on their frictional behavior has been studied. The coating composition has been optimized in relation to its antifrictional properties and the adhesion of...
Reciprocating tests were carried out on a number of different ceramics at a range of temperatures up to 1450°C in a high precision test system. The friction that was generated, and the damage to surfaces, were investigated. The aim of the experiments was to investigate the tribology of high-temperature ceramic contacts, and to provide data for high-temperature engineering applications of ceramics...
Sialon-based ceramic composite materials containing 0-20 wt.% Si 3 N 4 whiskers were hot pressed and their mechanical properties and microstructural characterization were investigated. The specimens were subjected to ball-on-reciprocating plate type wear tests at temperatures between room temperature and 1073 K. A gas blast type erosion tester was employed to examine erosion behavior...
Accelerated abrasive wear of plastic parts in a piece of production machinery prompted a laboratory study to find a material with better abrasion resistance. The abrasion occurred in a machine that compacted 'sand-like' particles of an inorganic compound. The abrasion resistance of a wide variety of plastics and different durometer polyurethanes (21 materials) was tested with a modification of the...
The overall objective of this study is to introduce a wear map of ceramics which shows the regions of dominant wear modes observed in a wide range of materials and operating conditions. Furthermore, from the wear map, common necessary conditions for the application of various ceramics as wear-resistant tribe-materials in a wide range of operating conditions are discussed. For this purpose, friction...
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.