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.
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Showing 1 to 20 of 78 for “"surface preparation"”.
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Optimization of surface preparation technique for unipolar silicon direct bonding
… of this thesis project is to find an optimum surface preparation technique for subsequent silicon wafer bonding. Wafer cleaning and treatment methods are investigated to understand the correlation between a high quality wafer surface and the resulting high quality electrical conduction at the …
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Effects Of Bond Coat Surface Preparation On Thermal Cycling Lifetime And Failure Characteristics Of Thermal Barrier Coatings
… of this study is to investigate the effects of surface modification for the NiCoCrAlY bond coats on the thermal cycling lifetime and failure characteristics of TBCs. Parameters of modification for the bond coats included as-sprayed, barrel-finished, hand-polished and pre-oxidation heat treatment …
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Study on corrosion protection of organic coatings using electrochemical techniques: developing electrochemical noise method, effective of surface preparation and inhomogeneity of organic coatings
… protection of steel by organic coatings, steel surface preparation and ionic conduction through the coating, as well as development of the electrochemical noise method as an effective assessment method. Surprising and somehow controversial previous findings at the University of Northampton …
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Pattern recognition techniques applied to rust classification in steel structures
… steel structure depends directly upon the steel surface preparation. The restoration of steel structure such as steel bridges, ships and storage tanks is due mainly to the use of manual surface inspection methods accompanied by surface preparation technologies. It requires a long project …
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Silver Surfaces for Dropwise Condensation of Steam
… the electroplating bath used and the method of surface preparation prior to plating. Six combinations of four plating baths and two surface preparation techniques were studied. The minimum thickness which was able to promote dropwise condensation was 500 (ANGSTROM). Vapor deposited silver over …
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Evaluation of thermographic techniques for the detection of subsurface delaminations in concrete bridge substructures
… infrared thermographic techniques to detect subsurface damage in concrete. Various methods of artificial heating, required to effectively apply this technique, are presented. Four major conclusions are reached in this study. 1) Normal ambient diurnal atmospheric temperature changes are not …
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Evaluation of bonding between ultra-thin portland cement concrete overlays and asphalt cement concrete
… base over time, considering the variables of ACC surface preparation, PCC thickness, synthetic fiber reinforcement usage, and joint spacing. Laboratory testing and full-scale field testing were used to accomplish the research objective. Laboratory testing involved monitoring interface strains in …
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Bond Behavior of Fiber Reinforced Polymer Bars Under Hinged Beam Conditions
… diameter, material configuration, and finished surface preparation were tested for bond strength parameters determined in accordance with ACI Committee Report 440.3. Bond strength parameters under the first condition were tested within NWC beams at a relatively low compressive strength and …
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Design of a carbon fiber suspension system for FSAE applications
… each end. Loctite E-120HP epoxy was used and the surface preparation, bond gap, and bond length were varied to find the optimal bond strength. An average bond strength of 2,382.6 pounds per square inch was determined for specimens with surface preparation. Furthermore a bond gap of 0.0065 to 0.008 …
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Sponge media drying using a swirling fluidized bed dryer
Surface preparation today has seen the introduction of sponge media as an alternative product against the traditionally used abrasive materials. Being soft and elastic, the sponge media reduces air borne emission significantly during surface preparation with capability to be re-used. However the …
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Enhanced Field Emission Studies on Nioboim Surfaces Relevant to High Field Superconducting Radio-Frequency Devices
… and sources of EFE sites strongly depend on surface preparation and handling. The main objective of this thesis project is to systematically investigate the sources of EFE from Nb, to evaluate the best available surface preparation techniques with respect to resulting field emission, and to …
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Laser and electron beam treatments for corrosion protection of friction stir welds in aerospace alloys
… treatments are required. A pre-weld treatment of surface preparation was required to ensure a weld with good mechanical properties. The surface preparation necessary is the removal of paint and anodising layers from aerospace alloys. Laser paint removal was assessed and designed to remove these …
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Effects of deformations on corrosion of Al-Mn alloys
… alloys can develop a thin deformed layer on the surface as a result of hot and cold rolling. Subsequent heat-treatment precipitates fine secondary intermetallic particles which effect corrosion susceptibility. This work focuses on the effect of surface preparation and deformation on the …
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Gold Surfaces for Dropwise Condensation
Gold surfaces were investigated as promoters of dropwise condensation of steam at atmospheric pressure. Seven gold electroplating baths, one electroless immersion gold plating bath, and vacuum gold vapor deposition were used as deposition techniques. Five different surface preparation techniques of …
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The effect of the surface condition of Aluminium ingot (AA3003) during roll bonding with clad Aluminium alloy (AA4045) to form an Aluminium brazing material
… the materials are stacked together, they undergo surface preparation. At Hulamin, the surface roughness of the core is kept at 10 µm and the surface roughness of the clad at 1 µm. After surface preparation, the stacked material is put into a hot rolling mill, where it undergoes reduction through …
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Surface and interface characterisation of high-k dielectric materials on silicon and III-V semiconductor substrates
… dielectric oxide materials and semiconductor surfaces is of critical importance to the development of the next generation of high speed semiconductor devices. This thesis investigates the deposition and characterisation of a range of candidate high-k materials on both silicon and III-V (InGaAs …
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Evaluations of concrete overlays for bridge deck applications
… were tested for two different substrate surface preparation conditions: Mechanical abrasion and chemical etching.;The results show that FRC had the highest compressive and split tensile strengths, and MMC and MMC-FA had very low chloride permeability values, while LMC exhibited extremely …
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Investigation of the Chemical Evolution of InAs Native Oxide and Its Impact on the Surface Electronic Properties
… native oxide using six samples with different surface preparation techniques. For times of exposure in ambient conditions between 2.5 min and 24 hours, the As-species composition varies significantly between samples during the exposures of less than 20 minutes. However, we find that after 2 …
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Multiaxial Fatigue Life Extension of Steel Elements Using Shape-Memory Alloy/Carbon Fiber-Reinforced Polymer (SMA/CFRP) Patch
… that included fatigue tests across various surface preparation methods, repair techniques, and loading conditions was conducted. A suite of material, recovery force, and pullout tests supported the program. Surface characterization tests informed the evaluation of the grit blasting and power …
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Environmental Performance of Steel Grit and Specialty Sand as Abrasives
Dry abrasive blasting is a surface preparation process used in shipyards for cleaning the surfaces of the metal plates to be used in various components of the ship. Commonly used abrasives include sand, steel grit, mineral abrasives, metallic abrasives, and synthetic abrasives. The basic objective …
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