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Articles 5731 - 5760 of 16791

Full-Text Articles in Materials Science and Engineering

Resistive Switching In Atomic Layer Deposited Hfo2/Zro2 Nanolayer Stacks, Lin Tang, Hiraku Maruyama, Taihao Han, Juan C. Nino, Yonghong Chen, Dou Zhang Jun 2020

Resistive Switching In Atomic Layer Deposited Hfo2/Zro2 Nanolayer Stacks, Lin Tang, Hiraku Maruyama, Taihao Han, Juan C. Nino, Yonghong Chen, Dou Zhang

Materials Science and Engineering Faculty Research & Creative Works

The resistive switching properties of HfO2/ZrO2 nanolayers with the total thickness of 16 nm prepared using atomic layer deposition (ALD) were investigated. Current-voltage behavior, pulse time mode measurement, retention and endurance tests were carried out to characterize the memristive (memory-resistive) properties. Resistive switching was observed in all nanolayer stacks, and the set voltage (Vset) decreased with increasing the number of layers (i.e., increasing number of hafnia-zirconia interfaces). Grazing incidence x-ray diffraction (GI-XRD) results demonstrate that the hafnia transforms from monoclinic to orthorhombic crystal structure during the post metallization annealing. Shifts in the binding energy of the x-ray …

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Demonstration Of A Distributed Bragg Reflector For Polyvinylcarbazole And Cadmium Sulfide Layers: Modeling And Comparison To Experimental Results, Javier E. Hasbun, L. Ajith Desilva Jun 2020

Demonstration Of A Distributed Bragg Reflector For Polyvinylcarbazole And Cadmium Sulfide Layers: Modeling And Comparison To Experimental Results, Javier E. Hasbun, L. Ajith Desilva

Georgia Journal of Science

Light wave propagation in a periodically stratified medium has many applications in physics, mathematics, and engineering. The subject is of interest to students, teachers, and researchers, as it presents a great opportunity to focus on principles of optics and to understand the basics of mathematical modeling. A complete theory of wave propagation can be derived using Born’s optics theory. We employed that theory to determine the reflectivity of a one-dimensional distributed Bragg reflector (DBR) and do simulations using MATLAB. A DBR is a photonic crystal consisting of alternating layers of materials with different refractive indices. In this study, we modeled …

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Cancer Biomarker Detection In Human Plasma By Integrating Surface Acoustic Wave And Metal-Enhanced Fluorescence, Yuqi Huang Jun 2020

Cancer Biomarker Detection In Human Plasma By Integrating Surface Acoustic Wave And Metal-Enhanced Fluorescence, Yuqi Huang

USF Tampa Graduate Theses and Dissertations

This thesis includes data and discussion about the technique of metal-enhanced fluorescence (MEF) to lower the detection limit of carcinoembryonic antigen (CEA). The detection limit goes down to 100pg/mL level when using MEF substrate made by rapid thermally annealed silver film covered by silica, which has great promise in diagnosing certain types of cancer that uses CEA as detection biomarker, such as pancreatic cancer and colon cancer. To further address the issue of background noises from non-specifically bound proteins (NSB) in complex media, such as plasma, serum, urine and blood, MEF is integrated with surface acoustic wave (SAW) streaming in …

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Investigation Of Neoprene Medical Gloves: Analysis Of Material Properties, Durability, And Bacterial Barrier Efficacy, Amanda Agui Jun 2020

Investigation Of Neoprene Medical Gloves: Analysis Of Material Properties, Durability, And Bacterial Barrier Efficacy, Amanda Agui

Honors Scholar Theses

This work aims to investigate the material properties, durability, and bacterial barrier efficacy of neoprene for applications in the healthcare/medical field. A special focus on material stiffness and fatigue failure will be explored. Additionally, manufacturer regulations and testing will be inspected to ensure medical gloves made of neoprene blends have a proper lifespan for its desired application in the healthcare community. The resistance of protective gloves and its ability to withstand perforation failure will be investigated to guarantee the safety of users holds extreme importance. Lastly, an analysis of the bacterial barrier efficacy of neoprene gloves will be determined.

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Preparation Of Glass Ionomer Cement From Recycled Low Alumina Glass, Sura S. Al-Tae'e, Ola M. Almitwalli, Saad B. H. Farid Jun 2020

Preparation Of Glass Ionomer Cement From Recycled Low Alumina Glass, Sura S. Al-Tae'e, Ola M. Almitwalli, Saad B. H. Farid

Karbala International Journal of Modern Science

Fluoroaluminosilicate glass was prepared from recycled low alumina glass, with the additions of AlF3 and CaF. That was to provide a cheap source of proper glass required to prepare glass ionomer cement GIC. Three batches of the fluoroaluminosilicate glass were prepared with different additions of CaF varied at the expense of AlF3. i.e., the glass was prepared with three different CaO contents. The prepared glasses were used as an essential part of GICs. It was found that a crystalline phase (fluorapatite) appeared as part of the set cement matrix. The XRD of the set cements indicated that …

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Recent Advances In Electrospun Sustainable Composites For Biomedical, Environmental, Energy, And Packaging Applications., Hao Liu, Christopher R Gough, Qianqian Deng, Zhenggui Gu, Fang Wang, Xiao Hu Jun 2020

Recent Advances In Electrospun Sustainable Composites For Biomedical, Environmental, Energy, And Packaging Applications., Hao Liu, Christopher R Gough, Qianqian Deng, Zhenggui Gu, Fang Wang, Xiao Hu

College of Science & Mathematics Departmental Research

Electrospinning has gained constant enthusiasm and wide interest as a novel sustainable material processing technique due to its ease of operation and wide adaptability for fabricating eco-friendly fibers on a nanoscale. In addition, the device working parameters, spinning solution properties, and the environmental factors can have a significant effect on the fibers' morphology during electrospinning. This review summarizes the newly developed principles and influence factors for electrospinning technology in the past five years, including these factors' interactions with the electrospinning mechanism as well as its most recent applications of electrospun natural or sustainable composite materials in biology, environmental protection, energy, …

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Development Of Reduced Chemical Kinetic Models For The Numerical Simulation Of Combustion And Emissions Behavior Of Representative Conventional And Bio-Derived Fuels, Mazen A. Eldeeb Jun 2020

Development Of Reduced Chemical Kinetic Models For The Numerical Simulation Of Combustion And Emissions Behavior Of Representative Conventional And Bio-Derived Fuels, Mazen A. Eldeeb

Mineta Transportation Institute

The study addresses two of the main challenges facing combustion modeling for transportation fuels: simultaneous simulation of non-related combustion problems and reducing the computational cost of the modeling process itself. To address the first challenge, researchers determine a characteristic flame time from thermal diffusivity and laminar burning velocity. Researchers examine parametric dependence of flame time and ignition delay time on pressure, temperature and equivalence ratio for methane, based on validated chemical kinetic mechanisms. The study reveals flame time and ignition delay time show similar temperature dependence, flame time has stronger dependence on equivalence ratio and weaker dependence on pressure than …

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Fabrication Of Magnetocaloric La(Fe,Si)13 Thick Films, N H. Dung, N B. Doan, P De Rango, L Ranno, Karl G. Sandeman, N M. Dempsey Jun 2020

Fabrication Of Magnetocaloric La(Fe,Si)13 Thick Films, N H. Dung, N B. Doan, P De Rango, L Ranno, Karl G. Sandeman, N M. Dempsey

Publications and Research

La(Fe,Si)13–based compounds are considered to be very promising magnetocaloric materials for magnetic refrigeration applications. Many studies have focused on this material family but only in bulk form. In this paper we report on the fabrication of thick films of La(Fe,Si)13, both with and without post-hydriding. These films exhibit magnetic and structural properties comparable to bulk materials. We also observe that the ferromagnetic phase transition has a negative thermal hysteresis, a phenomenon not previously found in this material but which may have its origins in the availability of a strain energy reservoir, as in the cases of …

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The Effect Of Distal Core Flattening And Heat Treatment On 304 Stainless Steel Guide Wires, Andrew Spencer Yap, Bryce Eric Veit, Matthew Frederick Lopez Villena Jun 2020

The Effect Of Distal Core Flattening And Heat Treatment On 304 Stainless Steel Guide Wires, Andrew Spencer Yap, Bryce Eric Veit, Matthew Frederick Lopez Villena

Materials Engineering

The mechanical response of 304 stainless steel guide wires due to different temper conditions and amounts of flattening is to be explored in this project. For this specific project, there is no public literature on the mechanical properties of guide wires with the above conditions through tensile testing or Turns to Failure Testing. To address this, the project with Abbott Vascular will measure the mechanical properties of guide wires using the aforementioned factors. Due to a lack of previous literature on this research topic, there are no quantitative goals for the project, however, any new research compiled in this area …

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Miniaturized Ultraviolet Imager Phase Iii, Bradley D. Albright, Nicolas A. Armenta, Colin W. Harrop Jun 2020

Miniaturized Ultraviolet Imager Phase Iii, Bradley D. Albright, Nicolas A. Armenta, Colin W. Harrop

Mechanical Engineering

This document details the work to date, June 9, 2020, done by the Cal Poly Mechanical Engineering senior project team, Miniaturized Ultraviolet Imager: Phase III (MUVI III), sponsored by the University of California, Berkeley – Space Sciences Laboratory (UCB SSL). MUVI III is the third senior project team of an ongoing design, MUVI: the prototype of a 2U sized CubeSat intended to capture aurora images in the ionosphere. The first team, MUVI I, finished development of the UV imager. The second team, MUVI II, designed the mirror mounting and deployable door mechanisms. The goal of MUVI phase III is to …

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Tribological Properties Of Polymeric Composites: A Review, Yusuf Şahin, Hakan Şahin Jun 2020

Tribological Properties Of Polymeric Composites: A Review, Yusuf Şahin, Hakan Şahin

Journal of Metals, Materials and Minerals

Tribology deals with interacting surfaces in sliding, rolling or any others types of motions, which is much importance in designing for machine components to improve their durability's of mechanical engineering systems. This study overviews the most recent studies on the tribological behavior of polymeric based materials containing different fillers. Some microstructural and mechanical properties of the epoxy composite are introduced. In addition, mechanisms of increasing wear resistance and reducing friction coefficient for polymeric composites are reviewed. An overview is also covered the process optimization for the dry wear results of polymeric composites using Taguchi Method (TM) and Response Surface Method …

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Ceramic And Glass-Ceramic Fillers In Dental Composites: A Review, Sumana Ghosh Jun 2020

Ceramic And Glass-Ceramic Fillers In Dental Composites: A Review, Sumana Ghosh

Journal of Metals, Materials and Minerals

Dental composite fillings are most popular fillings wherein various fillers have been suitably dispersed in a polymerizable resin. Major challenges are to make choice of suitable filler and their distribution in the resin matrix in the development of the dental fillings. Apart from traditional fillers ceramic whiskers, glass fibres, branched fibres and nanoporous powders have also been investigated as fillers in dental composites. Recently, ceramic, and glass-ceramic fillers are attracting attention of the researchers due to their suitable combination of material properties. In the current paper, the prospect of ceramic and glass-ceramics as fillers in fabricating dental composites has been …

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Insearchfornear-Room-Temperaturesuperconductingcriticaltemperatureofmetalsuperhydridesunderhighpressure: A Review, Udomsilp Pinsook Jun 2020

Insearchfornear-Room-Temperaturesuperconductingcriticaltemperatureofmetalsuperhydridesunderhighpressure: A Review, Udomsilp Pinsook

Journal of Metals, Materials and Minerals

An overview and the latest status of the superconductivity of metal superhydrides under high pressure are discussed in this review article. The searching for near-room-temperature superconductors have been one of the most enthusiastic fields in physics. This is because of several key factors in both theoretical and experimental sides. By advanced experiment innovation, pressure exceeded that of the earth's core can be generated in laboratories. This allows scientists to explore new physics of materials under high pressure. In the synergy form, the theoretical calculation gives accountable predictions on the structural and electronic properties which can be served as a practical …

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Synthesis And Characterization Of Ball-Milled Eggshell And Al2o3 Reinforced Hybrid Green Composite Material, Shrawan Kumar, Shashi Prakash Dwivedi, Vijay Kumar Dwived Jun 2020

Synthesis And Characterization Of Ball-Milled Eggshell And Al2o3 Reinforced Hybrid Green Composite Material, Shrawan Kumar, Shashi Prakash Dwivedi, Vijay Kumar Dwived

Journal of Metals, Materials and Minerals

Eggshell is a by-product (a secondary product derived from a production process) which produces lots of environment pollution. However, some environment pollution can be reduced by utilizing this waste. In the present investigation, an attempt was made to utilize eggshell as the reinforcement material with alumina (Al2O3) in the development of composite material. Carbonized eggshell particles and Al2O3 ceramic particles were ball-milled up to 100 hours to obtain a uniform particle size of reinforcement particles. Results showed that by using Al2O3 with eggshell in the development of aluminium based composite material after the ball-milling, mechanical properties were significantly improved. However, …

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Production Of Silica-Based Ceramics Sintered Under Nitrogen Atmosphere From Rice Husk And Sugarcane Bagasse Ash, Wiphawan Khopthong, Benya Cherdhirunkorn Jun 2020

Production Of Silica-Based Ceramics Sintered Under Nitrogen Atmosphere From Rice Husk And Sugarcane Bagasse Ash, Wiphawan Khopthong, Benya Cherdhirunkorn

Journal of Metals, Materials and Minerals

Nitride silica-based ceramics were prepared by sintering under nitrogen atmosphere using rice husk ash and bagasse ash as raw materials. X-ray Fluorescence Spectrometry (XRF) and X-ray Diffractometor (XRD) studies revealed that the main phase of rice husk ash (after calcined at 600C for 6 h.) was amorphous silica, whereas the sugarcane bagasse ash contained quartz and CaCO3. Thus, both ashes would be a good source for silica. Two batches of the 100 wt% rice husk ash (RHA100) and the mixture of 50 wt% rice husk ash and 50 wt% bagasse ash (RHA50BA50) were wet milled using planetary ball milling machine, …

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Green-Based Corrosion Protection For Mild Steel In 3.5% Nacl And Distilled Water Medias: Jatropha Curcas And Roselle Extracts, Muhammad A. Afandi, Safaa N. Saud, Esah Hamzah Jun 2020

Green-Based Corrosion Protection For Mild Steel In 3.5% Nacl And Distilled Water Medias: Jatropha Curcas And Roselle Extracts, Muhammad A. Afandi, Safaa N. Saud, Esah Hamzah

Journal of Metals, Materials and Minerals

In this study, the natural sources of Jatropha curcas and Hibiscus Sabdariffa calynx (Roselle) extracts as green corrosion inhibitors were employed to improve the corrosion resistance of mild steel in simulated (3.5% NaCl) and distilled water medias. The inhibiting performance of two types of extracts was studied by visual inspection, microscope analysis, and various electrochemical measurements and the data of corrosion rate were statistically analyzed. The main phenolic compounds of Jatropha and Roselle extracts were confirmed via a liquid chromatography-mass spectrometry. Meanwhile, the functional groups of active phytochemical compounds were characterized via attenuated total reflection spectroscopy (ATR). The results of …

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Properties Of Wood-Plastic Composites Based On Pvc/Pla/Pbat Ternary Blend, Laksamon Raksaksri, Phasawat Chaiwutthinan, Amnouy Larpkasemsuk, Saowaroj Chuayjuljit, Anyaporn Boonmahitthisud Jun 2020

Properties Of Wood-Plastic Composites Based On Pvc/Pla/Pbat Ternary Blend, Laksamon Raksaksri, Phasawat Chaiwutthinan, Amnouy Larpkasemsuk, Saowaroj Chuayjuljit, Anyaporn Boonmahitthisud

Journal of Metals, Materials and Minerals

The objective of this work was to improve mechanical properties, thermal resistance, and biodegradability of poly(vinyl chloride) (PVC) by the addition of poly(lactic acid) (PLA), poly(butylene adipate-co-terephthalate) (PBAT), and wood flour (WF). The samples made from a mixture of PVC/PBAT exhibited the highest impact and tensile properties, while properties of the samples made from PVC/PLA had the highest flexural and thermal properties, PVC/PLA/PBAT mixed samples exhibited average mechanical properties. The addition of WF to all the blends increased impact strength, flexural properties, Young's modulus, thermal resistance, and biodegradability of the samples in comparison to those of the neat PVC and …

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Synthesis Of Hydroxyapatite From Cuttlebone Under Various Ph Conditions: An Approach For Medical Materials, Sineenart Kangkan, Premjit Arpornmaeklong, Sarute Ummartyotin Jun 2020

Synthesis Of Hydroxyapatite From Cuttlebone Under Various Ph Conditions: An Approach For Medical Materials, Sineenart Kangkan, Premjit Arpornmaeklong, Sarute Ummartyotin

Journal of Metals, Materials and Minerals

To support the bio-based economy, development on hydroxyapatite from cuttlebone was investigated. Cuttlebone is naturally occurring source of calcium. We calcined it at 700°C for 4 h to form a calcium oxide powder. Hydroxyapatite was coprecipitated with calcium oxide powder and phosphoric acid. The effect of the pH ranging from 6 - 10 was controlled by adding ammonium hydroxide. Fourier transform infrared and X-ray diffraction were employed to characterize the structural properties of the hydroxyapatite. Changes in pH did not affect the structural properties of the hydroxyapatite. Thermogravimetric analysis revealed that the hydroxyapatite was thermally stable up to 700°C. At …

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Distributed Manufacturing Of Open Source Medical Hardware For Pandemics, Joshua M. Pearce Jun 2020

Distributed Manufacturing Of Open Source Medical Hardware For Pandemics, Joshua M. Pearce

Michigan Tech Publications, Part 1

Distributed digital manufacturing offers a solution to medical supply and technology shortages during pandemics. To prepare for the next pandemic, this study reviews the state-of-the-art of open hardware designs needed in a COVID-19-like pandemic. It evaluates the readiness of the top twenty technologies requested by the Government of India. The results show that the majority of the actual medical products have some open source development, however, only 15% of the supporting technologies required to produce them are freely available. The results show there is still considerable research needed to provide open source paths for the development of all the medical …

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Design For Additive Manufacturing, Michael Charonnat, Leonardo Franco-Muñoz, Sam Noble, J.P. Purdom Jun 2020

Design For Additive Manufacturing, Michael Charonnat, Leonardo Franco-Muñoz, Sam Noble, J.P. Purdom

Mechanical Engineering

This document outlines the critical design details and timeline for the Design for Additive Manufacturing Senior Project sponsored by Solar Turbines, Inc. The scope of this project encompasses the redesign of two of Solar Turbine’s cast parts for metal additive manufacturing in order to minimize lead time, cost, and weight. With the overall objective of performing in-depth analysis exploring affordability & feasibility, this redesign process will aid Solar Turbines in expanding their knowledge of Design for Additive Manufacturing principles and enable them to further incorporate the use of additive manufacturing into their production processes. The first part that the team …

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Xas Analysis Of Copper Binding In Soils, Wapakorn Siriwong, Penphitcha Amonpattaratkit, Wantana Klysubun Jun 2020

Xas Analysis Of Copper Binding In Soils, Wapakorn Siriwong, Penphitcha Amonpattaratkit, Wantana Klysubun

Journal of Metals, Materials and Minerals

Ecological distribution of copper from soil is depended on its bioavailability and mobility. Copper binding on heterogeneous soil composition is a key information for understanding the long-term fate benefiting suitable management practice for copper in the environment. X-ray absorption spectroscopy (XAS) techniques were used to provide microscopic scale information of copper-binding on different soils. Soil samples containing 14.9-56.6% clay and 0.5-3.4% organic matter were studied. Dry-powder soil samples containing approximated 0.3% copper from batch equilibrated equilibrium experiments were analyzed. Copper K-edge spectrum were collected at the Synchrotron light research institute (SLRI), Thailand in X-ray absorption near edge structure (XANES) and …

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Preparation Of Alginate/2-Hydroxyethyl Methacrylate Composite Beads: Role Of Fillers And Characteristics Of Bead Formation, Somkiet Urusetthanon, Somchai Udon, Boonsri Kusuktham Jun 2020

Preparation Of Alginate/2-Hydroxyethyl Methacrylate Composite Beads: Role Of Fillers And Characteristics Of Bead Formation, Somkiet Urusetthanon, Somchai Udon, Boonsri Kusuktham

Journal of Metals, Materials and Minerals

In this research, alginate composite beads were prepared. The objective was to study the effect of particle size of fillers on the viscosity of alginate solution and bead formation. The sodium alginate solution with and without 2-hydroxyethyl methacrylate was dropped into calcium chloride to form the beads. The polymerization of the 2-hydroxyethyl methacrylate in the alginate matrix was occurred by using potassium persulphate as an initiator and N,N/-methylenebisacrylamide as a crosslinking agent and N,N,N/,N/ -tetramethylethylenediamine in the calcium chloride solution as an accelerator. For the preparation of the composite beads, the cotton dust, and sawdust at various ratios were mixed …

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Effect Of Polystyrene Molecular Weight And Zinc Oxide Concentration On Dewetting Behavior Of Polymeric Thin Films, Kattaleeya Sujaroon, Phanawan Whangdee, Nampueng Pangpaiboon Jun 2020

Effect Of Polystyrene Molecular Weight And Zinc Oxide Concentration On Dewetting Behavior Of Polymeric Thin Films, Kattaleeya Sujaroon, Phanawan Whangdee, Nampueng Pangpaiboon

Journal of Metals, Materials and Minerals

The separation between ultra-thin polymer film on metal oxide substrate is called dewetting. Dewetting causes the polymer films to loss their stability and other important properties, for example, the films may short circuit or reduce their transparency. Therefore, the stability of polymer thin films on substrate need to be improved. Addition of nanoparticles is one of the most popular technique used to increase the stability of polymer thin films. The correlation between the different of molecular weight and ZnO concentration on dewetting behavior was studied in this research. The appropriate concentration of ZnO on dewetting suppression in each molecular weight …

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Effects Of Sodium Silicate As Liquid Phase Sintering Additives On Properties Of Alumina Ceramics, Kanyapak Siriphaisarntavee, Charusporn Mongkolkachit, Mateekul Jiarawattananon, Karn Serivalsatit, Thanakorn Wasanapiarnpong Jun 2020

Effects Of Sodium Silicate As Liquid Phase Sintering Additives On Properties Of Alumina Ceramics, Kanyapak Siriphaisarntavee, Charusporn Mongkolkachit, Mateekul Jiarawattananon, Karn Serivalsatit, Thanakorn Wasanapiarnpong

Journal of Metals, Materials and Minerals

This research focused on the production of high-performance alumina products. The feasibility of using soluble alkali silicate in liquid phase sintering of alumina was studied. Liquid soluble alkali silicate was used to enhance the plastic forming of alumina and formed liquid phase sintering to attain fired alumina products with high strength, high alumina content and low water absorption. The methodology consisted of the mixing of organic binder with sodium silicate (Na2SiO3), used as liquid phase sintering additive, of 0-15 wt%. Magnesium carbonate (MgCO3), used as the grain growth inhibitor, of 0-1 wt% were added and followed by alumina powders. The …

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Analysis Of Burning Wood In The Transient State And The Application To Structural Design, Roberta Veliz, Kimberly Guzman Jun 2020

Analysis Of Burning Wood In The Transient State And The Application To Structural Design, Roberta Veliz, Kimberly Guzman

Architectural Engineering

Determining the extent of the contribution of exposed timber on compartment fire dynamics in open floor plans is a complex process. Designers traditionally used compartmentalization design methods which create spaces where flashover is likely, given the fuel load and ventilation conditions. However, due to the large geometric dimensions and spread of fuel, fires in open floor plans are more likely to remain as localized or traveling fires. As such, an understanding of not only ignition potential but also flame spread is critical to characterizing the contribution of exposed timber. An integral step in characterizing the potential contribution is through an …

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Effects Of Ring Rolling On Grain Size In Inconel 718 And Waspaloy, David Webster Jun 2020

Effects Of Ring Rolling On Grain Size In Inconel 718 And Waspaloy, David Webster

Materials Engineering

Carlton Forge Works, an industry leader in the manufacture of rolled rings, has observed anomalous grain structures in parts made from Inconel 718 and Waspaloy. These take the form of unusually large grains at the surface of the rings, causing them to fail industry grain size standards. Grain size testing is a critical part of evaluating parts before they are used as grain size and structure control many mechanical properties including creep resistance, low and high cycle fatigue life, and yield strength. These unusually large grains are only present within the first tenth of an inch of the surface of …

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Microstructure And Tensile Properties Of Close-Die Forged Ti-6al-4v Aircraft Engine Mount, Renee Roeder, Nick Chen, Michael Viksne Jun 2020

Microstructure And Tensile Properties Of Close-Die Forged Ti-6al-4v Aircraft Engine Mount, Renee Roeder, Nick Chen, Michael Viksne

Materials Engineering

The microstructural characteristics of a Ti-6Al-4V close-die forging that passes yield strength specifications are examined and found to be consistent with literature recommendations. Originally, the intent was to compare the microstructure of a forging that passed specification to the microstructure of a forging that did not pass specifications using the imaging software ImageJ. Due to time and safety constraints considering the COVID-19 pandemic, the data that is presented is incomplete data on only the forging that passes specifications. There are no comparisons between the forging that did not pass and the forging that passed.

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Non-Toxic Soil Thickeners For Reducing Mudslide Intensity, Mitchell William Jensen Jun 2020

Non-Toxic Soil Thickeners For Reducing Mudslide Intensity, Mitchell William Jensen

Materials Engineering

This project was intended to be a continuation of senior project work done last year by a group consisting of two Materials Engineering students and a Soil Science student. Their report was crucial in identifying a range of food thickeners that could be capable of performing in the mud thickening application. All thickeners that were chosen both this year and last year are biocompatible, to alleviate some toxicity concerns. The food thickeners all belong to a class of compounds known as colloids. Since water is the fluid being thickened, these compounds are more accurately referred to as hydrocolloids. Hydrocolloids are …

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Pitting Corrosion Of Oerlikon’S Abrasion Resistant Ferritic Stainless Steels, Matthew P. Nalty, Emma Wagstaff Jun 2020

Pitting Corrosion Of Oerlikon’S Abrasion Resistant Ferritic Stainless Steels, Matthew P. Nalty, Emma Wagstaff

Materials Engineering

Existing hardfacing coatings for hydraulic cylinders and brake disc applications crack during use leaving the components susceptible to corrosion. To address this problem, Oerlikon has designed three new alloys to be abrasion and corrosion resistant. This paper reviews the literature necessary to understand and quantify pitting resistance of stainless-steel alloys. It documents one round of testing ASTM G48 method A: Ferric Chloride Pitting Test of Stainless Steels on the new alloys P72-X9, P72-X13, P129-X9, as well as samples of 431, 316, and 2205 stainless steels. This paper also discusses improvements to the G48 testing method and industry use of the …

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Investigation Of Ceramic Firing Processes For Investment Casting Shell Molds, Leonardo Ken Hoaakua Nakamura, Rileigh Anne Cotter Jun 2020

Investigation Of Ceramic Firing Processes For Investment Casting Shell Molds, Leonardo Ken Hoaakua Nakamura, Rileigh Anne Cotter

Materials Engineering

PCC Structurals aims to improve the quality and consistency of their ceramic mold production for their investment casting processes to decrease product loss figures. Although their current production processes result in acceptable quantities of high-quality molds, a significant percentage of defective molds are produced. These defective molds cause appreciable product loss due to casting defects and mold failure. Available literature dictates that high-quality investment casting molds must exhibit fracture strengths within a desired range in order to perform adequately. However, information regarding specific firing procedures which consistently result in ceramic mold strengths within this range is not readily available. To …

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