Effect Of Pore Modifiers On Physical And Mechanical Properties Of High-Performance Cement Mortar,
2022
Chulalongkorn University
Effect Of Pore Modifiers On Physical And Mechanical Properties Of High-Performance Cement Mortar, Kisun Chunti, Sureerat Polsilapa, Parinya Chakartnarodome, Passakorn Sonprasarn, Wichit Prakaypan, Edward A. Laitila
Journal of Metals, Materials and Minerals
Two different pore modifiers (PM), artificial pozzolan (AP) and modified aluminum salt (MA), were introduced into the composition of a High Performance Cement Mortar (HPCM). The chemical compositions of raw materials, ordinary Portland cement (OPC), sea sand, AP, and MA were identified by X-Ray Fluorescence spectrometry (XRF). The hydration kinetics resulting from each PM added to the HPCM was investigated by the relevance of hydration temperature. The mechanical properties such as compressive strength, dynamic modulus of rupture, and dynamic modulus of elasticity were measured as well as water absorption and density. Additionally, Scanning Electron Microscope (SEM) and Brunauer-Emmett-Teller (BET) were …
The Effects Of Double Intercritical Annealing On Microstructure And Mechanical Properties Of 0.107c-2.39mn-0.453si Dual Phase Steel,
2022
Chulalongkorn University
The Effects Of Double Intercritical Annealing On Microstructure And Mechanical Properties Of 0.107c-2.39mn-0.453si Dual Phase Steel, Nithi Saenarjhan, Gobboon Lothongkum, Jatupon Opapaiboon
Journal of Metals, Materials and Minerals
In this study, double intercritical annealing was applied to modify the mechanical properties of 0.107%C-2.39%Mn-0.453%Si dual phase steel. The effects of the double intercritical annealing (DIA) method were investigated via microstructure observation and tensile test, and then compared with the single intercritical annealing (SIA) method. By increasing the intercritical annealing temperature, yield and tensile strengths increase while ductility decreases primarily due to the increase of martensite fraction. DIA leads to a slight reduction of the ferrite size and the martensite fraction regardless of the intercritical annealing temperature. Tensile results showed that DIA increases ductility without losing significant amount of strength. …
Utilization Of Rubber Tree Bark As A Carbon Source For Electric Arc Furnace Steelmaking: Carbon/Slag Interaction At 1550℃,
2022
Chulalongkorn University
Utilization Of Rubber Tree Bark As A Carbon Source For Electric Arc Furnace Steelmaking: Carbon/Slag Interaction At 1550℃, Wasutha Bandityaruck, Weerayut Srichaisiriwaech, Somyote Kongkarat
Journal of Metals, Materials and Minerals
Rubber tree bark (RTB) is a biomass that consists of wood and rubber parts, with high volatile and ash contents. This research reports the utilization of RTB as a carbon source in Electric Arc Furnace steelmaking processes. RTB was mixed with coal at a ratio of 1:1 by weight, and heated at 1000℃ under an argon atmosphere for 1 h. The chars were brought to contact with Electric Arc Furnace slag (37.86 wt% Fe2O3) at 1550℃ for 15 min to investigate their interaction and compared to coal. Coal showed short slag foaming behavior with a foaming time of 4 min, …
Green Acidic Catalyst From Cellulose Extracted From Sugarcane Bagasse Through Pretreatment By Electron Beam Irradiation And Subsequent Sulfonation For Sugar Production,
2022
Chulalongkorn University
Green Acidic Catalyst From Cellulose Extracted From Sugarcane Bagasse Through Pretreatment By Electron Beam Irradiation And Subsequent Sulfonation For Sugar Production, Thitirat Rattanawongwiboon, Prim Chanklinhorm, Threeraphat Chutimasakul, Tanagorn Kwamman, Wilasinee Kingkam, Rattapon Khamlue, Sarute Ummartyotin
Journal of Metals, Materials and Minerals
The objective of this research is to prepare a green acidic catalyst from cellulose derived from sugarcane bagasse (SB). Initially, SB was pretreated by electron beam irradiation with a dose of 50 kGy to 200 kGy and subsequent acid hydrolysis to obtain cellulose. The cellulose derived from SB was carbonized at different temperatures for 4 h and then sulfonated with heating at 120°C under reflux. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to confirm the successful preparation of acidic catalyst by irradiation pretreatment and subsequent sulfonation. The cellulose derived from irradiated SB at the lowest dose …
Sugarcane Waste-Derived Activated Carbon For Lithium-Sulfur Batteries With Enhanced Performance By Thiourea Doping,
2022
Chulalongkorn University
Sugarcane Waste-Derived Activated Carbon For Lithium-Sulfur Batteries With Enhanced Performance By Thiourea Doping, Yanisa Thumkaew, Vipada Petson, Thanapat Jorn-Am, Natee Sirisit, Chalathorn Chanthad, Jedsada Manyam, Xiao Liang, Shufeng Song, Peerasak Paoprasert
Journal of Metals, Materials and Minerals
In this work, bio-renewable sugarcane bagasse and leaf were utilized for the preparation of activated carbon (BAC and LAC), which was then employed as the host material in lithium-sulfur (Li-S) batteries. The activated carbon, for the first time, was doped with nitrogen and sulfur via the addition of thiourea during the synthesis of carbon char via a simple, one-step hydrothermal method. The activated carbon was used to fabricate the cathodes of the CR2032 coin cells. The amount of added thiourea was found to influence the nitrogen/sulfur content, porosity, amorphous/graphitic structure, and performance of the activated carbon. At 0.2C, BAC2 (4.15 …
Preparation Of Spent Coffee Grounds-Rubber Composites Using Natural Rubber Latex As Binder,
2022
Chulalongkorn University
Preparation Of Spent Coffee Grounds-Rubber Composites Using Natural Rubber Latex As Binder, Varittha Mitsaichon, Kanok-On Ruaesrijan, Pranee Phinyocheep, Taweechai Amornsakchai, Preeyanuch Junkong, Sombat Thanawan
Journal of Metals, Materials and Minerals
The aim of this work was to explore the use of natural rubber latex (NRL) as a natural binder (according to the BCG concept) to replace commercial synthetic binders such as polyurethane resin. A composite sheet of spent coffee ground (SCG) and natural rubber (NR) was prepared by mixing of SCG in NRL compounds having concentrations of 30% and 60% dry rubber content (DRC). The amount of SCG in the composites was varied from 33 to 167 part per hundred rubber (phr). The mixture was cast in a mold to form a thin sheet then left drying at room temperature …
Erratum To: In Search For Near-Room-Temperature Superconducting Critical Temperature Of Metal Superhydrides Under High Pressure: A Review,
2022
Chulalongkorn University
Erratum To: In Search For Near-Room-Temperature Superconducting Critical Temperature Of Metal Superhydrides Under High Pressure: A Review, Udomsilp Pinsook
Journal of Metals, Materials and Minerals
No abstract provided.
Broadband Dielectric Spectroscopic Detection Of Ethanol: A Side-By-Side Comparison Of Zno And Hkust-1 Mofs As Sensing Media,
2022
Old Dominion University
Broadband Dielectric Spectroscopic Detection Of Ethanol: A Side-By-Side Comparison Of Zno And Hkust-1 Mofs As Sensing Media, Papa K. Amoah, Zeinab Mohammed Hassan, Pengtao Lin, Engelbert Redel, Helmut Baumgart, Yaw S. Obeng
Electrical & Computer Engineering Faculty Publications
The most common gas sensors are based on chemically induced changes in electrical resistivity and necessarily involve making imperfect electrical contacts to the sensing materials, which introduce errors into the measurements. We leverage thermal- and chemical-induced changes in microwave propagation characteristics (i.e., S-parameters) to compare ZnO and surface-anchored metal-organic-framework (HKUST-1 MOF) thin films as sensing materials for detecting ethanol vapor, a typical volatile organic compound (VOC), at low temperatures. We show that the microwave propagation technique can detect ethanol at relatively low temperatures (<100 >°C), and afford new mechanistic insights that are inaccessible with the traditional dc-resistance-based measurements. In addition, …
Method For Reducing Warping Stresses In Torsionally Loaded I-Section Members Using Cfrp Plates,
2022
Old Dominion University
Method For Reducing Warping Stresses In Torsionally Loaded I-Section Members Using Cfrp Plates, Mamadou Konate, Zia Razzaq
Civil & Environmental Engineering Faculty Publications
This paper presents a method for reducing warping normal stresses in torsionally loaded I-section members by utilizing carbon fiber-reinforced polymer (CFRP) plates. The CFRP plates are bonded to the outer surfaces of the flanges with a view to reducing warping normal stresses. The maximum warping normal stress in the flanges of a steel I-shaped member without the CFRP plates is compared to those obtained with the CFRP plates having various thicknesses. It has been found that the use of CFRP plates bonded to both flanges of the I-section result in a substantial reduction of the warping stresses. For the study …
Fundamental Effects Of Al And Ta On Microstructure And Phase Transformations In The Al–Cr–Mo–Ta–Ti Refractory Complex Concentrated Alloy System,
2022
Missouri University of Science and Technology
Fundamental Effects Of Al And Ta On Microstructure And Phase Transformations In The Al–Cr–Mo–Ta–Ti Refractory Complex Concentrated Alloy System, Austin E. Mann, Joseph William Newkirk
Materials Science and Engineering Faculty Research & Creative Works
The effect of aluminum and tantalum concentrations on a refractory metal complex concentrated alloy is reported, particularly with respect to their effect on microstructure and phase composition of the alloy in cast and annealed form. Alloys with an equiatomic composition, (AlCrMoTaTi), an aluminum-lean composition (Al0.75CrMoTaTi), and a tantalum-lean composition (AlCrMoTa0.75Ti) are produced via arc melting. The alloys exhibit multiphase structures, confirmed by X-ray diffraction, microstructural characterization, and thermal analysis. The minor off-equiatomic adjustments of aluminum and tantalum in this alloy system did not drastically alter the prevalence of the Cr–Ta-based Laves phase. Correlations between thermodynamic predictions and observed phase transformations …
The Effects Of Mixing Multi-Component Hlw Glasses On Spinel Crystal Size,
2022
Missouri University of Science and Technology
The Effects Of Mixing Multi-Component Hlw Glasses On Spinel Crystal Size, C. (Charmayne) E. Lonergan, J. Rice, C. Skidmore, M. J. Schweiger, P. Hrma
Materials Science and Engineering Faculty Research & Creative Works
The Hanford Waste Treatment and Immobilization Plant will vitrify radioactive waste into borosilicate glass. The high-level waste (HLW) glass formulations are constrained by processing and property requirements, including restrictions aimed at avoiding detrimental impacts of spinel crystallization in the melter. To understand the impact of glass chemistry on crystallization, two HLW glasses precipitating small (∼5 μm) spinel crystals were individually mixed and melted with a glass that precipitated large (∼45 μm) spinel crystals in ratios of 25, 50, and 75 wt.%. The size of spinel crystals in the mixed glasses varied from 5 to 20 μm. Small crystal size was …
Plasma Spheroidization Of Gas-Atomized 304l Stainless Steel Powder For Laser Powder Bed Fusion Process,
2022
Missouri University of Science and Technology
Plasma Spheroidization Of Gas-Atomized 304l Stainless Steel Powder For Laser Powder Bed Fusion Process, M. Hossein Sehhat, Austin T. Sutton, Chia-Hung Hung, Ben Brown, Ronald J. O'Malley, Jonghyun Park, Ming-Chuan Leu
PSMRC Faculty Research
Particles of AISI 304L stainless steel powder were spheroidized by the induction plasma spheroidization process (TekSphero-15 spheroidization system) to assess the effects of the spheroidization process on powder and part properties. The morphology of both as-received and spheroidized powders was characterized by measuring particle size and shape distribution. The chemistry of powders was studied using inductively coupled plasma optical emission spectroscopy for evaluation of composing elements, and the powder’s microstructure was assessed by X-ray diffraction for phase identification and by electron backscattered diffraction patterns for crystallography characterization. The Revolution Powder Analyzer was used to quantify powder flowability. The mechanical properties …
A Flexible Dual-Mode Pressure Sensor With Ultra-High Sensitivity Based On Bto@Mwcnts Core-Shell Nanofibers,
2022
Qingdao University
A Flexible Dual-Mode Pressure Sensor With Ultra-High Sensitivity Based On Bto@Mwcnts Core-Shell Nanofibers, Bangze Zhou, Chenchen Li, Yanfen Zhou, Zhanxu Liu, Xue Gao, Xueqin Wang, Liang Jiang, Mingwei Tian, Feng-Lei Zhou, Stephen Jerrams, Jianyong Yu
Articles
Wearable flexible sensors have developed rapidly in recent years because of their improved capacity to detect human motion in wide-ranging situations. In order to meet the requirements of flexibility and low detection limits, a new pressure sensor was fabricated based on electrospun barium titanate/multi-wall carbon nanotubes (BTO@MWCNTs) core-shell nanofibers coated with styrene-ethylene-butene-styrene block copolymer (SEBS). The sensor material (BTO@MWCNTs/SEBS) had a SEBS to BTO/MWCNTs mass ratio of 20:1 and exhibited an excellent piezoelectricity over a wide range of workable pressures from 1 to 50 kPa, higher output current of 56.37 nA and a superior piezoresistivity over a broad working range …
The Role Of Microstructure On High-Temperature Oxidation Behavior Of Hafnium Carbide,
2022
Missouri University of Science and Technology
The Role Of Microstructure On High-Temperature Oxidation Behavior Of Hafnium Carbide, Jonathan A. Scott, Xiaoqing He, David W. Lipke
Materials Science and Engineering Faculty Research & Creative Works
Microstructure development of the products formed upon oxidation of hafnium carbide (HfCx, x = 0.65, 0.81, or 0.94) at 1300°C and 0.8 mbar oxygen pressure was investigated using Raman spectroscopy, X-ray diffraction, electron microscopy, and electron energy-loss spectroscopy. For all specimens a multilayered oxide scale was observed featuring an outermost porous hafnia layer and an interlayer adjacent to the parent carbide containing hafnia interspersed with carbon. The outermost hafnia features coarse pores presumably formed during initial stages of oxidation to allow rapidly evolving gaseous products to escape from the oxidation front. As the oxidation scale thickens, diffusional resistance results in …
Effect Of Spallation On Oxidation Kinetics Of Heat-Resistant Cr–Ni Austenitic Steels On Air And Combustion Atmosphere,
2022
Missouri University of Science and Technology
Effect Of Spallation On Oxidation Kinetics Of Heat-Resistant Cr–Ni Austenitic Steels On Air And Combustion Atmosphere, Simon N. Lekakh, Oleg Neroslavsky, Mei Li, Larry Godlewski, Wenhui Zhu
Materials Science and Engineering Faculty Research & Creative Works
Thin-walled castings made from Cr–Ni austenitic steels offer a combination of light weight of a near-net component with significant high temperature corrosion protection by forming a surface oxide layer. However, above critical service conditions (temperature, atmosphere, thermal cycling), oxidized surface can result in intensive surface degradation due to scale spallation. Scale spallation can decrease the wall thickness which could be detrimental to the in-service life of thin-walled castings. Experiments and stochastic simulations of spallation assisted oxidation were performed with three cast austenitic heat-resistant steels having different Cr–Ni concentrations at temperatures between 900 and 1000 ℃ on air and water vapor …
Re-Crosslinking Particle Gel For Co2 Compliance Control And Co2 Filtration Blocking,
2022
Missouri University of Science and Technology
Re-Crosslinking Particle Gel For Co2 Compliance Control And Co2 Filtration Blocking, Yifu Long, Baojun Bai, Thomas P. Schuman
Patents
The present invention generally relates to the composition of particle gels for CO2 - EOR and CO2 storage . More particularly , CO2 resistant particle gels are provided that can re - crosslink at subterranean conditions . These particle gels can be deployed to improve the conformance of CO , flooding , CO , huff - puff , or Water - Alternative - Gas ( WAG ) . The applications may also involve CO2 storage , such as the blocking of CO2 leakage and similar CO2 processing .
Hot Rolled Light-Gauge Martensitic Steel Sheet And Method For Making The Same,
2022
Missouri University of Science and Technology
Hot Rolled Light-Gauge Martensitic Steel Sheet And Method For Making The Same, James W. Watson, Paul Kelly, David C. Van Aken, Christopher Ronald Killmore
Patents
A hot rolled light - gauge martensitic steel sheet made by the steps comprising : ( a ) preparing a molten steel melt comprising : ( i ) by weight , between 0.20 % and 0.35 % carbon , less than 1.0 % chromium , between 0.7 % and 2.0 % manganese , between 0.10 % and 0.50% silicon , between 0.1 % and 1.0 % copper , less than 0.05 % niobium , less than 0.5 % molybdenum , and silicon killed containing less than 0.01 % aluminum , and ( ii ) the remainder iron and impurities result …
Fiber Assisted Re-Cross-Linkable Polymer Gel And Preformed Particle Gels For Fluid Loss And Conformance Control,
2022
Missouri University of Science and Technology
Fiber Assisted Re-Cross-Linkable Polymer Gel And Preformed Particle Gels For Fluid Loss And Conformance Control, Baojun Bai, Ze Wang, Zhe Sun, Jingyang Pu, Thomas P. Schuman
Patents
Described herein are compositions useful for controlling fluid flow, for example in a target zone of a subterranean environment, and methods of forming and using the same. The composition generally comprises a quantity of fibers and a quantity of swellable particles, which may be dispersed in a carrier fluid. The composition may be synthesized in the form of a bulk gel or may be gelatinated during use. The fibers in the compositions provide improved performance as compared to prior PPG and RPPG particle containing compositions. Specifically, the compositions reinforce the re-cross-linked/re-associated hydrogel plug in underground features and support proper rehydration …
Aluminum-Free Steel Alloys And Methods For Making The Same,
2022
Missouri University of Science and Technology
Aluminum-Free Steel Alloys And Methods For Making The Same, Daniel Morye Field, David C. Van Aken
Patents
Disclosed herein are TRIP (transformation induced plasticity) steel alloy thin metal strips or, stated differently, high strength, high ductility steel alloy thin metal strips formed of a composition described herein, being substantially free or free of aluminum. In being substantially free, the aluminum content is equal to or less than 0.01 % by weight.
Liquid Core Detection And Strand Condition Monitoring In A Continuous Caster Using Optical Fiber,
2022
Missouri University of Science and Technology
Liquid Core Detection And Strand Condition Monitoring In A Continuous Caster Using Optical Fiber, Deva Prasaad Neelakandan, Dinesh Reddy Alla, Jie Huang, Ronald J. O'Malley
PSMRC Faculty Research
Real-time monitoring of the liquid core position during the continuous casting of steel has been demonstrated using low-cost distributed optical-fiber-based strain sensors. These sensors were installed on the containment roll support structures in the segments of a production continuous caster to detect the position of the solid–liquid interface and monitor the strand condition during the continuous casting. Distributed Fiber Bragg Grating sensors (FBGs) were used in this work to monitor strain at six roll positions in the caster. The sensor performance was first validated by comparing optical strain measurements with conventional strain gauge measurements in the lab. Next, optical strain …
