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- <p>Conducting polymers<br />Gas detectors<br />Nanostructured materials<br />Polymers -- Structure</p> (1)
- <p>Metallic glasses -- Density<br />Metallic glasses -- Effect of temperature on<br />Metallic glasses -- Research</p> (1)
- <p>Microfluidics<br />Photolithography<br />Photoresists -- Materials</p> (1)
- <p>Solder and soldering -- Materials<br />Thermal analysis<br />Lead-free electronics manufacturing processes<br />Ball grid array technology<br />Vibration</p> (1)
- Borides -- Thermal properties<br />Heat resistant materials<br />Residual stresses<br />Silicon carbide -- Thermal properties<br />Zirconium -- Thermal properties (1)
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- Friction stir welding<br />Aluminum -- Welding<br />Welded joints<br />Strength of materials (1)
- Friction stir welding<br />Aluminum alloys -- Welding<br />Electric welding -- Equipment and supplies<br />Welded joints<br />Tools -- Design<br />Shear (Mechanics) (1)
- Nonferrous metals -- Metallurgy<br />Refractory materials -- Recycling (1)
- Zirconium diboride (1)
Articles 1 - 9 of 9
Full-Text Articles in Engineering
Applied Stress Effects On The Isothermal And Cyclic High-Temperature Oxidation Behavior Of Superalloys, Bryan R. Barnard
Applied Stress Effects On The Isothermal And Cyclic High-Temperature Oxidation Behavior Of Superalloys, Bryan R. Barnard
Masters Theses
The effects of applied tensile stresses on the isothermal and cyclic oxidation behavior of two nickel-based superalloys, HAYNES® 75® and HAYNES® 230®, were investigated through measurements of specific mass change, oxide morphology and thickness, degree and depth of internal oxidation, compositional changes in and around the oxide scales, and x-ray diffraction. Here, an applied tensile stress generally led to larger Cr/Ni ratios in the oxide scales, greater chromium depletion in areas directly under the oxide scales, lower specific-mass-change values, and thinner oxide scales. These improvements in oxidation resistance are attributed to a greater concentration of …
Recovery Of Materials From Recycling Of Spent Furnace Linings, Phani Krishna Angara Raghavendra
Recovery Of Materials From Recycling Of Spent Furnace Linings, Phani Krishna Angara Raghavendra
Masters Theses
"The objective of this research study is to evaluate the technical feasibility of liberating metal entrapped in the spent melting furnace linings obtained from a non-ferrous metal producer and develop an economic technique to recycle all of the materials presently landfilled. Five to six million pounds of spent melting furnace linings are landfilled annually from this non-ferrous producer"--Abstract, page iii.
Friction Stir Form Welding Of Aluminum Structures, Kamini Ashokkumar Gupta
Friction Stir Form Welding Of Aluminum Structures, Kamini Ashokkumar Gupta
Masters Theses
"The objective of this work was to demonstrate the applicability of friction stir welding (FSW) technology in the automotive industry. Increasing fuel prices, stringent safety and emission norms are continuously striving automakers to make lightweight, fuel efficient vehicles. Automotive engineers are researching for alternate materials in order to meet weight savings targets. Use of aluminum in place of steel in a car has been increasing for making lightweight vehicles. Conventional welding and spot welding are used as preferred joining methods by the automotive industry. However, if aluminum is used in place of steel alternate joining methods are to be researched. …
Evaluation Of Su8 And Ruthenium Oxide Materials For Microfluidic Devices, Margaret Theresa Audrain
Evaluation Of Su8 And Ruthenium Oxide Materials For Microfluidic Devices, Margaret Theresa Audrain
Masters Theses
"This thesis investigates two materials, SU8 photoresist and RuO₂, for possible incorporation into a self-calibrating microfluidic biosensor. The negative, epoxy based photoresist SU8 has been widely used in the fabrication of micro-electro-mechanical systems (MEMS) devices. This is due to its many desirable features that make it a suitable material for a wide variety of MEMS applications. The effects cross-linking (exposure dose) and bonding time have on bond strength and plasma modification of the SU8 surface were investigated as well as the bond strength of etched SU8. It was shown that adhesive bonding was an effective method of bonding, with bond …
Friction Stir Spot Welding Of Aluminum Alloys, Wei Yuan
Friction Stir Spot Welding Of Aluminum Alloys, Wei Yuan
Masters Theses
"Efforts to reduce vehicle weight and improve safety performance have resulted in increased application of light-weight aluminum alloys and a recent focus on the weldability of these alloys. Friction stir spot welding (FSSW) is a solid state welding technique (derivative from friction stir welding (FSW), which was developed as a novel method for joining aluminum alloys). During FSSW, the frictional heat generated at the tool-workpiece interface softens the surrounding material, and the rotating and moving pin causes material flow. The forging pressure and mixing of the plasticized material result in the formation of a solid bond region. The present work …
Synthesis Of Nanostructured Conducting Polymers And Their Application As Gas Sensors, Zhe-Fei Li
Synthesis Of Nanostructured Conducting Polymers And Their Application As Gas Sensors, Zhe-Fei Li
Masters Theses
"A single-step, bottom-up technique based on a nanostructured conducting polymer has been used to fabricate sensors. Small amounts of aqueous solutions of aniline, a dopant, and an oxidant were placed on an interdigitated electrode array. Ultraviolet (UV)-irradiation of the solutions enhanced polymerization, yielding a highly porous film of polyaniline nanofibers with mean diameters of around 100 nm and lengths on the order of 1 µm. Solutions that were not irradiated formed bulk-like polyaniline films. Nanofibers and bulk polyaniline sensors were exposed to vapors in an argon carrier gas including: chloroform, a weak proton donor; toluene, a vapor that causes polymer …
Thermal Characterization And Vibration Of Solder Alloys, Brandon Lee Brinkmeyer
Thermal Characterization And Vibration Of Solder Alloys, Brandon Lee Brinkmeyer
Masters Theses
"Recent legislation and growing environmental concerns have forced the electronics industry to discontinue the use of tin-lead (SnPb) solder. Although the legislation did not directly affect aerospace and defense industries, future transitions to lead-free (LF) solders are inevitable. Differences exist between these high reliability systems and consumer electronics, first of which is a very small production rate and a long life cycle which often leads to repair or rework procedures which introduce the potential for mixing of SnPb and LF solder. In this study, Sn-3Ag-0.5Cu (SAC305) was mixed with Sn-37Pb solder in amounts of 0, 25, 50, 75, and 100 …
Modeling And Measurement Of Thermal Residual Stresses And Isotope Effects On Thermo Physical Properties Of Zrb₂-Sic Ceramics, Michael P. Teague
Modeling And Measurement Of Thermal Residual Stresses And Isotope Effects On Thermo Physical Properties Of Zrb₂-Sic Ceramics, Michael P. Teague
Masters Theses
"Commercially available finite element modeling software (ABAQUS) was used to investigate the internal residual stresses that develop as a result of cooling from processing temperatures in ZrB₂-SiC ceramics. The size and shape of the SiC particles were varied to evaluate their effect on the residual stresses. Results were compared to experimental data and showed similar trends, where increasing SiC particle size increased tensile stress and also decreased strength. Models were used to analyze benefits of novel shaped SiC inclusions and also better understand the short comings of the composites. An attempt to validate the models using neutron diffraction to measure …
Elevated Temperature Behavior Of A Magnesium Based Bulk Metallic Glass, Neal C. Ross
Elevated Temperature Behavior Of A Magnesium Based Bulk Metallic Glass, Neal C. Ross
Masters Theses
"Bulk metallic glasses are a new material set that possess interesting and exceptional engineering properties. Their study has been a major focus of research in metallurgy since the early 1990s, and recently their properties have led to application in specialized applications. Limitations including material cost, maximum attainable cast diameters, and high density have prevented the widespread use of these materials. In particular, the high density of most bulk metallic glasses has significantly reduced their appeal to the aerospace community. In an effort to overcome this, research is being performed on producing lower density glass forming systems based on magnesium and …