Papers by Keyword: Erosion Wear

Abstract: The predominant method of transporting fly ash involves conveying it in slurry form through pipelines within diverse industrial facilities. The key elements of slurry conveyance encompass bends, pumps, and valves. These components of the pipeline endure significant erosion and wear due to the impact of discrete particles. In this investigation, the study assessed the wear induced by slurry erosion in conventional 90⁰ pipe bend and 90⁰ square section elbows of different area ratios using ANSYS Fluent. The discrete phase model was used to estimate the slurry erosion wear for the fly ash-water suspension. From the investigation, the outcomes from the standard k-turbulence model were discovered to be in agreement with the experimental data. This study also looked at a number of other influencing factors, such as the solid concentration and velocity. The analysis reveals that the average erosion wear is lower in the square cross-section elbow compared to the standard elbow. Furthermore, the erosion wear is observed to decrease further with an increase in the cross-sectional area of the square section elbow.

Abstract: Erosion wear is the main failure cause of the throttling ring in artillery, which will lead to the reduction of the reliability of the throttling ring, which also will lead to degradation of the performance of recoil brake. According to the working conditions and environmental characteristics of the throttling ring, the finite element model of the erosion wear of the throttling ring is established, and the erosion wear simulation test is carried out to study the erosion wear rules of the throttling ring under different influencing factors, so as to evaluate the reliability of the throttling ring reasonably. It is of great theoretical and practical value to obtain the reliability information of the throttling ring under different working conditions and to ensure the normal performance of the recoil brake.

Abstract: In this work, an attempt is made to find out the difference in erosion resistance of bidirectional (fibre orientation in 0° and 90° only) and multidirectional (fibre orientation in 0°, 15° 30°, 45°, 60°, 75°, and 90°) glass fibre epoxy composites. The erosion rate of the composites at different sand impingement angles (30°, 45°, 60°, and 90°) and at different velocities (86.57m/s, 101.15m/s, and 119.2m/s) was observed. The maximum erosion rate was observed at 45° sand impingement angle for both bidirectional and multidirectional composites. The orientation of the fibre in the composite has very little significance on the erosion rate. Both the composites with unidirectional and bidirectional glass fibre showed semi ductile behaviour. SEM was used to examine the surface of the specimen subjected to erosion. Erosion tendency with impact angle and fibre orientation was also touched upon in the study.

Abstract: Micro-groove textured surface of alumina-based ceramic coating is successfully fabricated via laser surface texturing (LST) method. The fabrication of textured surface is aimed to improve the resistivity of components against erosive wear. In this study, a slurry pot testing is conducted to investigate erosion damage on the surface of the textured alumina-based coating. The erosive wear rate of the specimens is determined and the surface morphology of the eroded surface is examined using an SEM. From the results, it is found that the erosion damage of textured coatings is dependent on the impact angles of SiO₂ particles. The erosion wear mechanism is found to be varied with the formation of the micro-groove textured coatings. A significant decrease of 45 % in the erosion rate proved that the occurrence of an improved erosion resistance.

Abstract: Modern approaches to the creation of single-layer and multi-layer high-temperature coatings for the protection of heat-resistant carbon-containing composite materials from oxidation and erosion in the high-speed fluxes of oxygen-containing gases are analyzed. Particularly have been outlined the heat-resistant coatings, the main components of which are either super refractory transition metal borides (ZrB₂, HfB₂, TiB₂) with the addition of carbides (SiC, ZrC, HfC, TiC, TaC), silicides (MoSi₂, TiSi₂, ZrSi₂, TaSi₂, WSi₂) and nitrides (HfN, ZrN, TiN), or refractory oxides (HfO₂, ZrO₂), or more complex synthetic compositions based on oxide ceramics. The results of fire gas-dynamic tests of coatings of perspective compositions are presented. The potential architecture of ultra-high-temperature coatings with high efficiency of protective action is justified.

Abstract: A resin matrix compound coating is prepared by taking epoxy as the matrix and α-Al₂O₃ particle as the reinforced phase. By simulating the actual wear conditions of pipes in the heavy medium coal preparation in a laboratory, the paper explored the change law of the erosion wear resistance of wear-resistant coating with different reinforced particle sizes and abrasion angles, and discussed the wear mechanism by combining with abrasive appearances. The results show that reinforced particles with a lager particle size (60 mesh) are of excellent erosion wear resistance when the erosion wear particle is smaller (200 mesh), and the α-Al₂O₃ particle wear-resistant epoxy coating with a particle size of 60-80 mesh is of good erosion wear resistance under the condition of heavy medium coal preparation and is suitable to be a wear-resistant coating material.

Abstract: Hammers are the key machine element of high-speed hammer mills which lead to the coal pulverisation process. Progressive material loss from the hammer occurs due to the mechanical interactions between the coal particles and the hammer surface. Coal pulveriser industries implement extensive efforts to combat against premature material loss from the hammer surface due to coal particle impact which may result in premature failure. This work investigates the erosion wear mechanism through computational simulation. A numerical model is developed using Abaqus^® to simulate the solid coal particle impacting onto the hammer (target).The Abaqus/Explicit^® dynamic simulation solver is used for this analysis. The interactions between the solid coal particles and the target are modelled using the Abaqus/Explicit^® element deletion method. The Johnson and Cook plasticity model is employed to analyse the flow stress behaviour of ductile materials during impact. The developed stress and plastic strain are analysed through simulation on the impact surface. This model is applied to different ductile alloys to determine the best erosion wear resistance hammer material for extending the operating life of hammers in the coal pulverisation process.

Abstract: T This paper examines the abrasive and erosive wear of duplex multilayer TiN/TiCN and TiN/TiBN coatings deposited on quenched and tempered hot work tool steel grade X37CrMoV5-1. The coatings were produced by duplex method composed of a plasma nitriding and pulsed direct current (DC) plasma-assisted chemical-vapor deposition (PACVD). Measurements of the thickness of the deposited coatings were determined by calotest. Adhesion of the layers were determined by the Rockwell-C indentation test and the microhardness profile in a diffusion zone beneath the surface was determined by Vickers method (HV 0.05). Tests of abrasive wear resistance were carried out using "Dry Sand-Rubber Wheel” method. Test of erosion resistance of the base material and of duplex layers was carried out by exposing test samples to impact erosion of fine sand particles and determining the loss of mass after 60 minutes of wear. Worn surface were analysed by stereomicroscopy. The results show increasing wear resistance of duplex multilayer coatings of TiN/TiCN and TiN/TiBN in relation to plasma nitrided and uncoated steel (in the quenched in tempered condition).

Abstract: Under the bad environment, high polymer wear-resistant material has more superior erosion wear resistant performance than metal. It can replace wear-resistant metal material partly. In this paper, high polymer wear-resistant coat has been prepared with the epoxy resin, low molecular polyamide, nanoAl₂O₃ coupling agent. The shear strength and wear resistant test has been carried out under different elements content, and the test curve of coat is given. The results are analyzed. By the experiment result, the optimum coat formula is: low molecular polyamide content is 60% relative to E – 51; and the content of MoS₂ is 12%. The result shows that the coat erosion wear resistance is 9 times of 45# steel under the best recipe. The coat is used to repair a worn mortar pump impeller, and the effect is obvious.

Abstract: In recent years, the pitching sliding sleeve staged fracturing technology of open hole packer of horizontal well is widely used in shale gas, dense reservoirs, low permeable reservoirs and other exploration and development fields, and becomes the important means of present oil-gas field stimulation. But in the construction process of horizontal well fracturing, the abnormal condition that the sliding sleeve is not opened or is opened invisibly is occurred repeatedly, which has big impact on the fracturing construction. Based on fluid dynamics method and Finnie micro-cutting theory, this paper simulated the erosion wear rate of ball seat at the different fracturing segments. The results showed that: the construction displacement has big impact on the erosion wear, followed by the particle size of proppant and sand ratio, wherein the erosion wear is in inversely proportional to the particle size of proppant; and when multistage fracturing, the possibility that the sliding sleeve close to the toe end and heel happens erosion destruction is much less than that of sliding sleeve in the middle.