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 57 for “"Oxidation resistance"”.
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Improving the oxidation resistance of diboride-based ceramics
<p>"Oxidation behavior has restricted the development of ZrB₂-based ceramics for aerospace and hypersonic flight vehicles applications. The research presented in this dissertation focuses on the effect of transition metal (TM) additives on oxidation behavior of ZrB₂ ceramics. In the first stage of …
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Design Strategies for Improving the Oxidation Resistance of Multi-Principal Element Alloys
… to their unique yield strength, creep life, and oxidation re-sistance when subject to harsh environments exceeding 1000 °C. While they have withstoodthe increasing operation temperatures seen in turbine engines with use of intricate coolingand coatings, they have reached their core metallurgical …
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Improving Oxidation Resistance in Polycrystalline Ni-based Superalloys for High-Temperature Applications
… Ni-based superalloys with enhanced oxidation resistance can enable higher operating temperatures in aeroengines with increased fuel efficiencies and minimised CO₂ emissions. This thesis investigated the oxidation behaviour in polycrystalline Ni-based superalloys with a combination of …
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The Impact of Morphology and Composition on the Resistivity and Oxidation Resistance of Metal Nanostructure Films
… nanostructures is dominated by the contact resistance between particles.</p><p> This result supported previous research showing that junction resistance between Ag NWs in thin film conductors also dominates optoelectronic performance. Since the goal is to replace silver with copper, we …
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ADVANCED PHOSPHORUS BASED MIGRATION RESISTANT ANTI-OXIDANTS FOR CARBON-CARBON COMPOSITE AIRCRAFT BRAKES WITH INCREASED CATALYTIC OXIDATION RESISTANCE
… the C/C composite stators and rotors to prevent oxidation. Currently, commercial phosphorus based coating materials are made of crystalline metal phosphates that are derived from heat treated phosphoric acid-based liquid precursors painted on the non-rubbing surface of C/C composites. These …
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Study of the properties of cemented carbides from industrial production
… remarkable properties of high hardness and wear resistance. Mechanical properties are strongly related to microstructure, namely the binder amount and the carbide grain size. Increasing the binder content and the carbide grain size, the hardness decreases ad the fracture toughness increases. In …
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ΔΟΜΙΚΟΙ ΜΕΤΑΣΧΗΜΑΤΙΣΜΟΙ ΚΑΤΑ ΤΗΝ ΑΝΟΠΤΗΣΗ ΑΝΟΞΕΙΔΩΤΩΝ ΦΕΡΡΙΤΙΚΩΝ ΧΑΛΥΒΩΝ ΚΑΙ Η ΕΠΙΔΡΑΣΗ ΤΟΥΣ ΣΤΗ ΣΥΜΠΕΡΙΦΟΡΑ ΚΑΤΑ ΤΗ ΘΡΑΥΣΗ ΚΑΙ ΚΑΤΑ ΤΗΝ ΟΞΕΙΔΩΣΗ ΥΨΗΛΗΣ ΘΕΡΜΟΚΡΑΣΙΑΣ
… ZR AND NIADDITION IMPROVED THE HIGH TEMPERATURE OXIDATION RESISTANCE OF THE ALLOYS.
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Reaction sintered silicon nitride as a coating for carbon-carbon composites
… carbide coated material exhibits its highest oxidation rate; RSSN afforded less protection to ACC because of a larger thermal expansion mismatch. Organosilicon densification and metallic silicon sealing methods were studied as means of further increasing the oxidation resistance of the …
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Reaction processing for the development of ultra-high temperature ceramics
… retention at elevated temperatures, and moderate oxidation resistance when compared to high temperature carbides. However, diborides have often been reported to exhibit low strength and significant strength degradation by 1500⁰C; therefore, limiting their use at high temperatures...This research …
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Development of Low-Cost Polycrystalline Nickel-Base Superalloys for Gas Turbine Applications
… mechanical properties, thermal stability and oxidation resistance. Extensive alloy development has produced a diverse class of alloys suited to a wide range of operating conditions. This work details research performed to develop new low-cost polycrystalline Ni-base superalloys, intended for …
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Alloying effects on high-temperature deformation behavior of nickel aluminide intermetallics
… high melting temperature, and its proven oxidation resistance. Currently, limited ductility at lower temperatures and low creep resistance at high temperatures limit the capabilities of NiAl.;For this research four different alloys were investigated to determine the effects of alloy …
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Thermochemical modeling and chemical vapor deposition of two-phase borides in the Hf-Si-B-Cl-H system
… coatings that form a protective layer during oxidation have been found to withstand these extreme conditions. Chemical vapor deposition has been chosen as a viable processing technique for producing these coatings. It is expected that two-phase boride coatings will have enhanced oxidation …
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MAX phases as an electrocatalyst support material: a DFT study
… Ti3SiC2, show good electrical conductivity and oxidation resistance. These MAX phases have been investigated using density functional theory (DFT) in this thesis to determine their properties. The density of states show that they are electrically conductive, with a continuous band over the Fermi …
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Processing and characterization of boron nitride composites and films
… by high fabrication costs, susceptibility to oxidation, and high electrical conductivity. Boron nitride (BN) provides a suitable alternative to carbon because of its oxidation resistance and its low dielectric constant. This thesis describes a novel approach to the synthesis of BN composites …
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The thermal conductivity of intermetallics
… its toughness, specific strength and stiffness, oxidation resistance and low cost. The possible use of ruthenium aluminide in high temperature industrial applications required an investigation of the thermal properties of this compound. Apparatus, capable of measuring thermal conductivity at …
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Compositional Exploration and Microstructural- Environmental Evaluation of Alloys for Glass Vitrification Applications
… thermal and chemical conditions that accelerate oxidation and corrosion, limiting service life. To address this challenge, two alloying strategies were explored for Co-101: (i) variations in C (0.25 and 0.5 wt%) and Si (1 and 4 wt%) content, and (ii) the addition of Ta (up to 3.1 at.%). The …
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Green synthesis and characterization of gold nanoparticles from capparis sepiaria-tabernaemontana elegans cocktail and investigation of their biological effects in vitro.
… avoidance of the development of antimicrobial resistance therefore needs increasing attention in the management of patients, with chronic wound infection. nanotechnology presents a groundbreaking method for synthesizing biocompatible nanomaterials (nms), revolutionizing wound healing with soft, …
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Boron induced surface modification of transition metals
… several properties such as hardness, wear resistance, corrosion resistance, and high temperature oxidation resistance improve which make the metal substrate more suitable for industrial applications. These boronized parts are used in many industrial applications like ingot moulds, …
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ELECTROLYTIC DEPOSITION OF MgO ON STAINLESS STEEL SUBSTRATE
… with magnesium oxide is expected to increase the oxidation and corrosion resistance of the tubes. Fabrication of magnesium oxide coating was a two-step process. First, a magnesium hydroxide coating was deposited on the SAE 316L stainless steel substrate in an electrochemical bath and then the …
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Development and characterisation of novel low-friction wear-resistant multiplayer nanocomposite CrAlTiCN coatings
… were conducted on the as-deposited and oxidation-tested CrAlTiCN coatings, and the results are presented and discussed. It is possible to generate novel CrAlTiCN coatings with the carbon content up to 24.34 at% by closed-field unbalanced magnetron sputtering of graphite target. The …
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