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Showing 1 to 16 of 16 for “"Refractory metal"”.
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Microstructural Evolution in Refractory Metal Multi-Component Alloy Systems
… for alternative high temperature materials. Refractory superalloys based on AlTaTiZr and AlMoNbTaTiZr have attracted particular interest, as early studies indicate that the essential attributes for elevated temperature service are accessible within this class. The principal challenge is that …
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X-Ray Mass Absorption Coefficients and Quantitative Microanalysis of Metallurgical Systems, Including Refractory Metal-Interstitial Compounds
Made available in DSpace on 2015-05-12T21:41:02Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6915311.PDF: 5848870 bytes, checksum: 73fd9ba07647a2d4ba87b7fd356e0474 (MD5) Previous issue date: 1969
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The role of alloying elements on the microstructure and thermal stability of Refractory Metal High Entropy Superalloys
… alloys are being investigated, including refractory metal high entropy superalloys (RSAs), based on the AlMoNbTaTiVZr system. These alloys comprise nanoscale order-disordered B2+bcc microstructures, similar to nickel-based superalloys, and have promising high temperature compressive yield …
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Microstructures and mechanical properties of the sputter deposited copper(x) tantalum(1-x) films
Copper-refractory metal composites/alloys are of interest for aerospace and related applications requiring good thermal conductivity and high strength at elevated temperatures. These materials, due to generally very low mutual solubilities, may allow development of high strength microstructures …
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Advances In The Electrodeposition Of Tantalum From Ionic Liquids In A Technical Plating Setup
<p>Tantalum is a tough, ductile, refractory metal that is highly corrosion resistant. The corrosion resistance of tantalum is evident in diverse conditions, including high temperature and severe chemical environments. Application of a tantalum layer onto other metal substrates would be a beneficial …
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GaN electronics for high-temperature applications
… injections transistors (GITs) with ion-implanted refractory metal contacts. The Si ion implantation in AlGaN/GaN heterostructures was comprehensively studied here regarding implantation conditions, activation annealing conditions, metallization schemes. A self-aligned gate-first process, together …
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The electromigration drift velocity and the reliability of dual-damascene copper interconnect trees
Cu has replaced Al as the interconnect metal of choice for high performance Si-based integrated circuits. Its electromigration behavior must be quantified and an experimental basis for a circuit-level reliability assessment is needed. Experiments on straight two-terminal via-to-via Cu …
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High-performance metallo-dielectric photonic crystals: Design, fabrication, and testing of a practical emitter for portable thermophotovoltaic generators
… of a square array of cavities etched into a refractory metal substrate, and whose emission spectrum can be tuned by adjusting the geometry of the cavities. In particular, previous work has shown that photonic crystals made of tantalum and conformally coated with hafnium oxide can achieve …
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Structure-Property Relationships of Tantalum Carbide Foams and Synthesis of an Interpenetrating Phase Composite
Ceramic and refractory metal foams have a potential for use in extreme environments, such as in fuel elements within nuclear reactors both in space and terrestrial applications. In addition, infiltrating an open-cell ceramic foam with a continuous second phase can create an interpenetrating phase …
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Calcium oxide-based sorbents for CO2 capture at high temperature
… matrix shows great promise. High melting point refractory metal oxides have been identified as an example class of efficient additives. In this dissertation, two less common synthetic approaches, mechanochemistry and ultrasonic spray pyrolysis (USP), were utilized to prepare highly stable …
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TRANSITION METAL COATINGS FOR ENERGY CONVERSION AND STORAGE; ELECTROCHEMICAL AND HIGH TEMPERATURE APPLICATIONS
… For inclusion in supercapacitors, transition metal oxide and sulfide electrodes such as RuO2, IrO2, TiS2, and MoS2 exhibit rapid faradaic electron–transfer reactions combined with low resistance. The pseudocapacitance of RuO2 is about 720 F/g, and is 100 times greater than double-layer …
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Interaction of plasmas with lithium and tungsten fusion plasma facing components
… replacement in higher heat flux devices. As a refractory metal, tungsten’s large melting point and thermal conductivity as well as its low sputtering yield have led to its selection as the material of choice of the ITER divertor. Experiments have reinforced this choice demonstrating tungsten’s …
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Custom engineered nanomaterials for energetics and energy applications
… hydrogen peroxide. Lastly, a less sensitive bimetal nano-powder for replacement of commonly used nano-sized aluminum is prepared by electro-exploded wires of pure metals. Morphology and phase compositions of nanomaterials are characterized by scanning electron microscopy (SEM), transmission …
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RF Ohmic MEMS Switches Utilizing Printed and Carbon Based Nanomaterials for Space Applications
… the development of Radio Frequency (RF) Ohmic (metal-to-metal contact-type) MEMS (micro-electro-mechanical-systems) Switches for Space Applications. Ohmic contact devices void of any dielectric layer are considered exclusively in order to avoid the possibility of dielectric charging during …
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New methodologies for interconnect reliability assessments of integrated circuits
… development of next-generation circuits and new metallization technologies will require new and more accurate means of assessing interconnect reliability. Reliability assessments based on conventional methodologies are flawed in a number of very important ways, including the disregard of the …
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Characterization of amorphous silicon carbide and silicon carbonitride thin films synthesized by polymer-source chemical vapor deposition mechanical structural and metal-interface properties
… 2], Si[subscript 3]N[subscript 4], Cr, Ti and refractory metal-coated silicon has been studied. The effect of thermal annealing on the structural and mechanical properties of the prepared films has been discussed in detail. The composition and bonding states are uniquely characterized with …