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The Coriolis tester, and especially its long specimen version, simulates well the slurry flow conditions in pumps, cyclones, pipes, etc. and provides a slurry erosion test mode that is closest to having well-defined particle–target impingement conditions. The predominance of glancing angle slurry impingement ensures that only a fraction of erodent particles has a normal component of impact velocity...
Galling is a severe type of wear that occurs when relative motion exists between contacting surfaces with extensive local adhesion. The ASTM button-on-block test method for galling resistance of a material couple requires a large number of specimens and an apparatus with very high load capacity for testing at a range of different loads to find the threshold galling stress. In contrast, the galling...
The Coriolis slurry tester provides a means of discriminating between the resistance of different materials to slurry erosion damage under low interaction intensity (low impingement angle and low normal velocity impact) conditions. A new design of the rotor-specimen holder assembly has been evolved to provide better control of the slurry flow over and along test specimen surfaces. Wear patterns on...
The Coriolis test is used for evaluating the slurry erosion behaviour of materials. Experiments with a model single glass bead-in-water ''slurry'' have revealed the nature of, and extent of damage at, all contact sites along a soft copper specimen surface. The results confirm previous theoretical predictions that in the Coriolis test mode erodent particles interact with the specimen in a series of...
Tungsten carbide spray coatings have become well established for resisting abrasion and erosion in pumps used in conventional oil production and in oil sands operations. To achieve additional benefits from the extreme wear resistance of tungsten carbide its use is being extended to solid forms for some critical components. Slightly harder titanium carbonitride-based cermets have much lower density...
The Coriolis erosion tester consists of a rotor with a diametrical passage in which two flat specimens are located equidistant from the centre. At high rotation speeds, slurry flows outwards from the centre by centrifugal force while the erodent particles are directed towards the specimen surfaces by the Coriolis force. This test mode offers a quick, simple and reproducible means of simulating the...
The wear mechanism of plasma-sprayed alumina was studied by scratching a model alumina coating using a diamond indenter. Single scratching on polished virgin surface, repeated scratching over the same track and parallel interacting scratching were investigated. The predominant mechanism of material removal was found to be microfracture within the quasi-plastic zone, which takes place preferentially...
The wear properties of commonly used magnetic particles (CrO 2 , Co-γ-Fe 2 O 3 , metal particles (MP) and barium ferrite (BaFeO)) and head cleaning agents (HCAs) (Al 2 O 3 and Cr 2 O 3 ) were studied. A simple accelerated wear test method was used for the experimental study. This method used a standard polishing process on a chip module made...
The objective of this research is to better understand the mechanisms of material removal in the free abrasive polishing process. Experiments were carried out to understand the effects of particle size, polishing pad and nominal contact pressure on the wear rate and surface roughness of the polished surface. A theoretical model was developed to predict the relationship between the polishing parameters...
The friction and wear caused by a single hard asperity in repeated sliding contact have been studied in our earlier publications. This paper outlines a method of combining all the contacts that occur between a soft surface and the asperities on a randomly rough hard surface and leads to predictions of the overall coefficient of friction and the wear rate of the soft surface. The hard asperities are...
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