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.
The problem of the fatigue strength of wear resistant materials is significant both from the theory and practical point of view. In abrasive wear two different mechanisms of material removal occur either separately or simultaneously. At abrasion and low-angle abrasive erosion, microcutting is dominating and the main criterion for materials selection is hardness. At abrasive impact wear and high angle...
Erosion equations are usually obtained from controlled experimental tests for solid particles carried in a gas or liquid flow. These equations are then applied to estimate the erosion damage resulting from solid particle impacts for cases of practical interest. It is well known that the particle impact speed and impact angle affect the erosion process and are used as parameters in most erosion equations...
The microstructure, hardness and erosion behavior of High velocity oxy-fuel (HVOF) thermal sprayed and heat treated NiAl intermetallic coatings with three different ceria were studied through erosion tests, Vickers hardness tests and microstructural characterizations in this paper. Test results showed that heat treatment can obviously change the erosion behavior of the HVOF thermal sprayed NiAl intermetallic...
Significant research has been done in the cavitation behavior of metallic alloys (steel, aluminum, etc.) and to a much lesser degree engineering ceramics. Corrosion will enhance cavitation damage in metallic alloys, whereas ceramics are generally considered to be immune to most types of corrosion and should demonstrate the same cavitation behavior regardless of media. This preliminary study evaluates...
A major source of industrial wear problems is through the erosive component wear from hard particles carried in a jet of fluid. There are currently no recognised standards for this type of test. In view of this the National Physical Laboratory has had a new concept liquid jet erosion rig designed and built by Phoenix Tribology Ltd., Newbury, United Kingdom. The rig uses a bypass valve system to regulate...
An experimental approach to accelerated laboratory testing sand erosion in high pressure flow channels of complicated 3D configurations was developed. The channels were designed for erosion-resistant valves in natural gas and oil severe service applications. An analysis of equations of the particle motion in turbulent flow defined a method for scaling the channel dimensions, the erodent size and fluid...
When bubbles collapse near solid surfaces, cavitation damage can occur. Two are the already known erosion mechanisms: liquid micro-jets impingement and shock waves. These micro-jets and shock waves are responsible for material loss from the surface, basically by wear failure. In the rotating disk device, a disk with cavitation inducers and specimens fixed on it rotates inside a water chamber to provide...
In the automotive industry, polymer components are routinely employed in a wide variety of situations. Where such components are employed in visible applications, their aesthetic appeal is commonly enhanced by the application of surface coatings, such as paints or chrome plate. However, throughout the lifecycle of the component, coating removal may be required to enhance its ability to be reused or...
This paper describes observations of wear mechanisms made through examination of the surfaces of WC hardmetals samples tested in a number of different laboratory abrasion and erosion wear tests.The tests that were used included ASTM G65 and ASTM B611 abrasive tests, scratch testing at a range of different loads and with different indenter geometries, and gas blast erosion.Evaluation of the dependence...
Cermet based WC–Co–Cr thermally sprayed coatings are known for their good wear and corrosion performance. Different intermediate layers with various deposition processes were performed between cermet WC–Co–Cr coatings to form a sandwich structure to enhance adhesion and to damp particle impacts during erosion. As the outer cermet layer exhibits high hardness against abrasion whereas the intermediate...
The sand erosion rates of novel compositions of hard ceramics such as tungsten carbide, silicon nitride, silicon carbide, and partially stabilized zirconia have been tested in air-sand erosion facilities. A new testing facility that ensured stable and reproducible erosion testing with sand velocities and concentrations up to 250m/s and 5wt% in air, respectively, was built at IMI. Special rig design...
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.