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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"erosion resistance"”.
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Autonomous materials for active erosion resistance in low-Earth orbit
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
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Improving Erosion Resistance and Revegetation of Wildfire-Altered Soils Using Microbial Induced Calcite Precipitation
… properties and make them less resistant to erosion which results in debris flows when wildfire are followed by a rainfall event. The reduced activity of microorganisms that aid in nutrient absorption makes the soil less effective in supporting plant life. Microbial Induced Calcite …
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Erosion-corrosion resistance of tungsten carbide hard metals with different binder compositions
A study has been made of the slurry erosion resistance of a series of cemented tungsten carbides with different binder compositions consisting of combinations of cobalt, nickel and chromium. Testing was carried out on a specially designed laboratory rig in both tap and salt water using silica sand …
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The erosion of ultrafine WC-Co
… have been characterised and subjected to slurry erosion and cavitation erosion. A further twelve WC-Co alloys of varying grain sizes and cobalt contents have been produced through conventional processes and subjected to the same tests in order to provide data for comparison. The erosion …
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Cavitation erosion of materials
… fluids and materials for combating cavitation erosion in hydraulic mining machinery operating,on 5:95 oil-in-water emulsions, Controlled cavitation was generated in the laboratory in a vibratory cavitation apparatus employing the stationery specimen system. The influence of separation distance …
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Flow and sediment properties influencing erosion of fine-grained marine sediments : sea floor and laboratory experiments
Erosion processes involving fine-grained marine sediments were studied by using an in situ flume to erode undisturbed bottom sediments on the sea floor in Buzzards Bay, a shallow marine embayment off the Massachusetts coast. Tte muddy sea floor in that area is characterized by a deposit-feeding …
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The erosion of materials
Solid particle erosion tests of glass, stainless steel, WC-Co and sintered alumina, have been performed with seven erodents using a range of particle diameters D (63 μm - 1000 μm), velocities V (33 m.s⁻¹ - 131 m.s⁻¹ ) and impact angles α (30° - 90°). The seven erodents are steel shot, glass beads, …
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Temporal and Thermal Effects on Fluvial Erosion of Cohesive Streambank Soils
… United States, the annual cost of on-site soil erosion problems such as soil and nutrient losses, and off-site soil erosion problems such as sedimentation of lakes and river, loss of navigable waterways, flooding and water quality impairment, has been estimated at 44 billion USD (Pimentel, 1995; …
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Cavitation erosion of engineering materials
… in this thesis is concerned with evaluating the erosion resistance or behaviour of various engineering materials to cavitation erosion in a through flow device. A wide range of engineering materials have been utilized, from metal alloys, plastics, ceramics to composiles. These were procured from …
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Evaluation of the formability properties of nitrogen alloyed metastable austenitic stainless steels
… by nitrogen. A study of the cavitation erosion of the test alloys was initiated because it is known that TRIP enhances cavitation erosion resistance in stainless steels. Results indicate that the metastable test alloys demonstrate superior erosion resistance when compared with the stable …
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Gibbsian Segregating Alloys Driven by Thermal and Concentration Gradients: A Potential Grazing Collector Optics Used in EUV Lithography
… of collector degradation from intense plasma erosion and debris deposition. Reflectivity and lifetime of the collector optics will be heavily dependent on surface chemistry interactions between fuels and various mirror materials, in addition to high-energy ion and neutral particle erosion …
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Tillage Effects on Soil Properties and Crop Production in Southern Illinois
… system whereas the NT system had better water (erosion resistance) and nutrient relations rating than the MP system. The MP and the CP systems had water relation rating of 0.25 and 0.21 than the NT system (0.60) showing that residue on soil surface is important for protection of soil against …
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Tribology in coal-fired power plants
… size and type were varied for solid-partide erosion, whereas effects of the applied load, abrasive speed and type of abrasive were studied for abrasive wear. The target materials were also evaluated in terms of morphology and mechanical properties including hardness, flexural modulus and …
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The tribological behaviour of a high nitrogen manganese austenitic stainless steel
… were abrasion, abrasion-corrosion and cavitation erosion. The high nitrogen alloy contained 0.63wt% nitrogen and 0.83wt% nickel and was found to have mechanical properties superior to the other steels studied in this thesis. This alloy was also subject to cold deformation and strain ageing and the …
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Nondestructive Evaluation of Zirconium Phosphate Bonded Silicon Nitride Radomes
… thermally stable dielectric constant, high rain erosion resistance and a low-cost processing method, has been developed for radome applications in advanced tactical missiles. Pressureless sintering reduces processing costs, but is untried for radome manufacturing. The tendency for catastrophic …
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The effects of properties, microstructure and phase transformation on the erosion of hard materials
… subjected to both solid particle and cavitation erosion. The materials tested include three grain sizes of alumina, stabilised zirconias, sialon, cubic boron nitride and polycrystalline diamond, and these have a range of microstructural, physical and mechanical properties. The damage modes are …
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An assessment of polymeric materials and surface treated steels as cavitation erosion resistant materials
… are damaged by a process known as cavitation erosion and the operation and efficiency of machines are seriously impaired. Nineteen different polymers which have potential for use in hydraulic components have been eroded by liquid cavitation, employing the stationary specimen system. An attempt …
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Cavitation erosion of WC-Co
… investigation involving the vibratory cavitation erosion of WC-Co alloys was undertaken in order to determine the mechanisms of material removal. Nineteen grades of WC-Co alloys were studied. These alloys had been previously characterised according to microstructural and mechanical properties. …
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The slurry erosive-corrosive wear of a selection of aliminium alloys, particulate reinforced aluminium metal matrix composites and a selection of steels
… concepts relating to the synergistic effects of erosion and corrosion. In general both the heat-treatable and non heat-treatable aluminium alloys exhibit lower slurry erosion rates with increasing hardness and work to fracture values. The slurry erosion rates of the aluminium matrix alloys …
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On the Design of Instream Structures in the Mid-Atlantic United States: An Investigation of the Design, Project, and Watershed Factors that Affect Structure Success
… and watershed-scale variables related to flow, erosion resistance, and design approach. Relationships between structure scores and explanatory variables were evaluated using regression analysis. Structure performance was strongly influenced by the individual project, suggesting that design …
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