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 98 for “"Autoclave"”.
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Autoclave Studies of Lignite Liquefaction
… of North Dakota Time-Sampling Hot-Charge Batch Autoclave System with the gas at an initial pressure of 400 psig.</p><p>Oil yields and conversions ranged from 0.9 percent to 35.7 percent and 66.7 percent to 90.6 percent, respectively, increasing as the time at or near the reaction temperature …
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Advanced composites using non-autoclave processes: manufacturing and characterization
… objective of the present study is to develop non-autoclave processes to manufacture high performance composites for aerospace applications. In Paper 1, vacuum assisted resin transfer molding (VARTM) process was developed for elevated temperature composites. Use of VARTM process for fabricating …
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Design and modeling of an exhaust gas waste heat autoclave
… sterilization methods, a new steam sterilizer/autoclave system was designed and modeled. This system uses waste engine heat from the exhaust system of a diesel generator set to boil water and produce the pressurized steam conditions necessary for effective medical sterilization. Currently, the …
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Characterization of titanium cladded steel ignition in pressure oxidation leaching autoclave
Includes bibliographical references (leaves 143-144).
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Numerical modelling of hydrodynamics, gas dispersion and mass transfer in an autoclave
Includes abstract. Includes bibliographical references.
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Additive manufacture of dissolvable tooling for autoclave processing of fiber reinforced polymer composites
Autoclave processing of advanced fiber reinforced polymer composites (AFRPC) uses applied heat and pressure to yield high quality composite components. Geometrically accurate and thermally stable molds or tools are used to maintain the part form until the part cures and rigidizes. For high-volume …
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Lignite Liquefaction Using Carbon Monoxide and Water in a Hot-Charge Batch Autoclave
… using the UND hot-charge, time-sampled batch autoclave facility. Approximately two hundred grams of moisture- and ash-free lig nite, one hundred grams of water, four hundred grams of hydrogenated anthracene oil solvent and carbon monoxide gas were reacted in both cold- charge and hot-charge …
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Nanomaterial-Enabled Out-of-Autoclave and Out-of-Oven Manufacturing of Fiber Reinforced Polymer Composites
… composite structures generally require an autoclave cure, which uses both temperature and pressure to cure the thermoset polymer (or consolidate the thermoplastic polymer) in the prepreg and remove voids throughout the laminate. In this thesis, curing of autoclave-grade thermosetting …
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Capillary Effects of Nanoporous Networks on Aerospace Autoclave-grade Prepreg Composites Enabling Vacuum-bag-only Manufacturing
… Yet, many advanced aerospace-grade CFRPs require autoclave pressure vessels to thermally process composites, which has numerous drawbacks such as high capital costs, hours-long heating and cooling cycles, high energy use, and bottlenecks due to fixed size. This work investigates various …
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Design of a low-cost autoclave for adoption in rural health posts of the developing world
… nations as compared to developed nations. Autoclaves kill all dangerous pathogens, including heat-resistant endospores, and are an essential tool to achieving and maintaining a sterile environment, which decreases risk of infection. A low-cost, easy to use autoclave was designed to address …
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Out of autoclave manufacturing of cfrps having multiscale reinforcement for improved interlaminar fracture toughness and multifunctional characteristics
… the direct introduction of CNTs during Out-of-Autoclave (OoA) processes such as liquid resin infusion (LRI) or resin transfer molding (RTM). The present Dissertation aims to the development of Out-of-Autoclave Carbon Fibre Reinforced Polymers (CFRPs) with improved interlaminar fracture …
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Fundamental Behavior of Nanoporous Networks in the Out-of-Autoclave Manufacturing of Carbon Fiber Reinforced Polymer Composites
… in prepreg form, is often completed via autoclaves where elevated temperatures and pressures of typically 180 ◦C (350 ◦F) and 0.7 MPa (7 bars), respectively, are applied to cure the polymer matrix and compress the constituent laminae together. However, autoclaves are energy intensive, …
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The Effect of Hydrogen Partial Pressure on Lignite Liquefaction in a Two-Stage Hot-Charge Batch Autoclave System
… using the UND hot-charge, time sample, batch autoclave system. Approximately one hundred and fifty grams of moisture- and ash-free (MAF) Zap lignite, three hundred grams of AO4 (Anthracene oil) solvent and seventy five grams of water were reacted in the autoclave unit. Carbon monoxide was used …
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Nanomaterial-enabled manufacturing for next-generation multifunctional advanced composite prepreg laminate architectures
… structural composites has traditionally utilized autoclaves to impart heat and pressure, in addition to vacuum, to create high-quality, void (defect)- free, reproducible structures. Carbon (micro) fiber reinforced polymer (CFRP) composites, which are pre-impregnated with a thermoset or …
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Capturing irradiation-enhanced corrosion of zircaloy-4 with a charge-based diffusion/drift phase field model
… mechanism explaining the early departure from autoclave kinetics after 3-5 microns of oxide have formed has proved elusive. This thesis considers and evaluates a number of possible explanations for this early acceleration in kinetics. The bulk of the evidence points to Fe depletion from …
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An investigation into the suspension, attrition and breakage of nickel crystals during the nickel reduction process
… attrition and breakage of nickel crystals in an autoclave.
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The environmental effect on corrosion fatigue behavior of austenitic stainless steels
… This thesis work performs high temperature autoclave testing, post-test characterization and mechanistic modeling to understand the corrosion fatigue behavior of austenitic stainless steels in simulated light water reactor (LWR) environments. Crack growth rate (CGR) data were generated from …
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The Comparison of Composite Aircraft Field Repair Method (CAFRM) with Traditional Aircraft Repair Technologies
… some of the common repair methods such as the autoclave repair method, and Double Vacuum Debulk (DVD) repair method were tested against the Composite Aircraft Field Repair Method (CAFRM) proposed by the researcher. Specimens were tested with microscopy, acid digestion, short beam shear, and …
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Modeling of Nanostructured Heaters for Out-of-Oven Curing of Aerospace Composites
… heat, and pressure to a laminate using an autoclave. More recently, aerospace secondary structures have been able to be processed without the need of an autoclave, but with just vacuum pressure in an oven. However, both of these methods are energy, space, and time intensive processes. A new …
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