Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 21 for “"abrasive particles"”.
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Wear studies of abrasive particles
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1956
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Ice and abrasive particles : an alternative CMP polishing technique
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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An Investigation of Methods to Homogeneously Entrain and Suspend Abrasive Particles in a Low Pressure Dental Water Jet
… machine cutting tool. With the addition of abrasive particles and the improvement of high pressure pumps, the water jet stream is currently capable of cutting through metal, concrete, and composite materials. Water jet systems have been utilized at a wide range of different pressures. …
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Micromechanics of deformation and abrasive wear of fiber-filled elastomers
The abrasive wear of unfilled and fiber-filled elastomers was studied both with experiments and with finite element simulations. Wear experiments with elastomer seals exhibited two distinct regimes: an initial, "break-in" period followed by an "aggressive wear" period. During the break-in period, …
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The erosion of ductile metals by solid particle impact
… in which ductile metal surfaces were eroded with abrasive particles (size range 40 - 600nm) under controlled conditions. Damage to the surface was characterised by weight loss measurements, and also by microscopical examination. Surface and subsurface damage was studied using optical microscopy …
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Mechanics of abrasive wear of elastomeric materials
… often result in repeated contact with abrasive particles, which act to abrasively wear the elastomers. Elastomeric materials are observed to exhibit a characteristic form of abrasive pattern on the surface after cyclic scratching. The dimension of this pattern is closely related to the …
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Three-body abrasive wear of materials
… investigation into the phenomenon of three-body abrasive wear. A specially designed three body abrasive wear apparatus has been built, modified and evaluated as part of this overall study. Further, a series of commercially available candidate materials has been evaluated for wear resistance using …
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Multi-scale scratching in chemical-mechanical polishing
… are produced on Cu interconnects both by the abrasive particles in the slurry and by the softer pad asperities. In order to meet the stringent demands of precision polishing, scratching must be mitigated or eliminated. This thesis presents scratching models by analytical contact mechanics, …
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Pole tip recession in linear tape systems
… phase results in the formation of three-body abrasive particles that were swept across the tape head, and gave rise to three-body abrasive wear, particularly in the pole regions. Hence, PTR and subsequent which signal loss and error growth. The lower contact pressure of the LTO system …
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Improving the durability and performance of hollow fibre membranes with nanocomposite and inorganic/organic hybrid materials
… over time, especially in the presence of abrasive particles in seawater and other challenging water sources. Recent work in the literature has shown that the physical strength, flux and antifouling properties of membranes can be improved by incorporation of nanoparticles. In this work, …
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Evaluation and analysis of wear in progressive cavity pumps
… the rotor to the stator, and the presence of the abrasives carried within the slurry. for a pump manufacturer to remain active in the market they must provide the customer with optimised material selection, for both wearing parts, at a competitive price.Wear is not an intrinsic material property …
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Surface texture enhancement of SLS processed turbine blades using a mix of flexible media and abrasives
… advancements. This dissertation proposes a novel abrasive flow polishing technology that can lower polishing times as well as limiting damage that polishing may have on a component due to excessive forces. This is achieved by the addition of a flexible media to the abrasive particles to achieve …
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Ultraviolet Bonding of Diamond Abrasive Tools for Lap-Grinding Process
… lapping process is based on a slurry process, abrasive particles mixed with lapping fluid supplied during the process and the abrasives keep rolling and scratching in the working zone. By these actions, the material is removed from the work piece. As known, the lapping efficiency is limited due …
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Nano-scale scratching in chemical-mechanical polishing
… for modeling nano-scale scratching by the hard abrasive particles in the slurry. Single-particle models that use elastic and plastic analyses to determine both the lower- and upper-bounds for the load per particle are introduced. These bounds are established for both homogenous and composite …
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Multi-scale models for wafer surface evolution in chemical mechanical planarization
… I. Model II extends Model I to account for the abrasive particles effects. The wafer material removal is assumed to be primarily due to the slurry particles abrasion. Modeling is focused on a small region on the wafer surface. The contact pressure at this region is evaluated by Model I first. …
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Micro-scale scratching by soft pad asperities in chemical-mechanical polishing
… the necessary down force and motion to the abrasive particles for material removal. As the applied pressure is concentrated under few asperities, however, the asperities themselves, even though softer, may generate unintended micro-scratches on relatively hard surfaces under certain …
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Extrusion honing using mixtures of polyborosiloxanes and grit
… polymer, which is mixed with fine abrasive particles and forced through or around components using an extrusion honing machine to achieve the machining action. It is evident that the machining process is very dependent upon the physical and mechanical characteristics of the …
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The tribology of linear tape recording systems
… assumed therefore to provide three~body abrasive particles, thus increasing the pole-tip recession. Iron rich stain is found over the cycled standard head surface (preferentially over the pole-tip and to a lesser extent over the TiC grains) at any environment condition except high …
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Ni-Al-Ta alloys for high temperature abrasive coatings
… blade, the blade can be tipped with an abrasive system that cuts into an abradable liner on the static counter face. This should allow low clearance to be maintained during service. Currently, such systems for high-temperature use are composed of cubic boron nitride (cBN) abrasive …
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Surface Chemistry Of Application Specific Pads And Copper Chemical Mechanical Planarization
… layer by mechanical action of the pad and the abrasive particles, the dissolution of the abraded particles in the CMP solution, and the protection of the recess areas. The CMP process occurs at the atomic level at the pad/slurry/wafer interface, and hence, slurries and polishing pads play …
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