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Full-Text Articles in Engineering

Utilization Of Steel Slag In Development Of Sustainable And Durable Concrete., Karthik Prabhu T Dr, Gowri Shankar M Mr., Jagadesh P Dr., Nagarajan V Dr. May 2022

Utilization Of Steel Slag In Development Of Sustainable And Durable Concrete., Karthik Prabhu T Dr, Gowri Shankar M Mr., Jagadesh P Dr., Nagarajan V Dr.

International Journal of Advanced Technology in Civil Engineering

This paper reflects the results of an experimental investigation of the strength, permeability, abrasion, carbonation, and shrinkage characteristics of concrete containing various percentages of steel slag as partial replacement of natural fine aggregates. M 30 Grade concrete was designed as per specific national specifications. Steel slag was used to replace natural sand in the range of 0– 50%. It was observed that the steel slag blended concrete with up to 50% substitution exhibited a comparable compressive and flexural strength when compared to the control specimens. From the Dorry’s abrasion test, it was noted that the specimens could be implemented ...


Experimental Characterization And Manufacture Of Polymer Nanocomposite Dielectric Coatings For High-Temperature Superconductor Applications, Jacob Ryan Mahon May 2022

Experimental Characterization And Manufacture Of Polymer Nanocomposite Dielectric Coatings For High-Temperature Superconductor Applications, Jacob Ryan Mahon

Theses and Dissertations

Increased implementation of high-temperature superconducting (HTS) power transmission has the potential to revolutionize the efficiency of electrical grids and help unlock a fully electric transportation infrastructure. Realizing the benefits of HTS systems has been impeded by a lack of available dielectric insulation materials that can 1) withstand the extreme cryogenic operating environment of superconductors and 2) demonstrate low temperature processing that is compatible with existing superconductor manufacturing methods. Solving this problem necessitates a high-performance dielectric material with multifunctional properties specifically suited for operation in HTS systems. A polyamide and silicon dioxide (PA/SiO2) nanocomposite material with exceptional thermal stability has ...


Finite-Difference-Time-Domain Simulation Of Ultrafast Experiments, Alpha Ma May 2022

Finite-Difference-Time-Domain Simulation Of Ultrafast Experiments, Alpha Ma

Macalester Journal of Physics and Astronomy

The Finite-Difference-Time-Domain (FDTD) method is a numerical method that calculates electric fields or magnetic fields by interleaving them in space and time. Using a python package called “MEEP”, I was able to write optical simulations of ultrafast experiments, especially the Terahertz Pump-Probe experiments. The goal of this project was to use FDTD simulation to measure the transmission of an electro-magnetic pulse passing through a thin film of conducting material on a dielectric substrate in order to study the characteristic conductivity of potential solar cell materials.


Monolithically Integrated Microscale Pressure Sensor On An Optical Fiber Tip [U.S. Patent Us11326970b2], Jeremiah C. Williams, Hengky Chandrahalim May 2022

Monolithically Integrated Microscale Pressure Sensor On An Optical Fiber Tip [U.S. Patent Us11326970b2], Jeremiah C. Williams, Hengky Chandrahalim

Faculty Publications

A passive microscopic Fabry-Pérot Interferometer (FPI) pressure sensor includes an optical fiber and a three-dimensional microscopic optical enclosure. The three-dimensional microscopic optical enclosure includes tubular side walls having lateral pleated corrugations and attached to a cleaved tip of the optical fiber to receive a light signal. An optically reflecting end wall is distally engaged to the tubular side walls to enclose a trapped quantity of gas that longitudinally positions the optically reflecting end wall in relation to ambient air pressure, changing a distance traveled by a light signal reflected back through the optical fiber.


Designing & Building A Microwave Plasma Reactor For Graphene Synthesis, Aviv Zohman, Jerry Larue May 2022

Designing & Building A Microwave Plasma Reactor For Graphene Synthesis, Aviv Zohman, Jerry Larue

Student Scholar Symposium Abstracts and Posters

Graphene’s remarkable electrical, optical, and chemical properties make it a promising successor to indium tin oxide for applications in flexible, transparent electronics. However, efforts to manufacture graphene have been hindered by inefficient synthesis and transfer methods. Chemical vapor deposition (CVD) is commonly used to produce graphene. CVD starts with a blank surface onto which a chemical vapor is deposited to create a single graphene layer. CVD requires extreme temperatures, so only substrates with high melting points are applicable, like metals. This excludes insulative substrates such as polymers which are essential to transparent and flexible devices. Therefore, a subsequent process ...


Hinged Temperature-Immune Self-Referencing Fabry–Pérot Cavity Sensors [Us Patent Us11320596b2], Jeremiah C. Williams, Hengky Chandrahalim May 2022

Hinged Temperature-Immune Self-Referencing Fabry–Pérot Cavity Sensors [Us Patent Us11320596b2], Jeremiah C. Williams, Hengky Chandrahalim

Faculty Publications

A passive microscopic Fabry-Pérot Interferometer (FPI) sensor includes a three-dimensional microscopic optical structure formed on a cleaved tip of the optical fighter using a two-photon polymerization process on a photosensitive polymer by a three-dimensional micromachining device. The three-dimensional microscopic optical structure having a hinged optical layer pivotally connected to a distal portion of a suspended structure. A reflective layer is deposited on a mirror surface of the hinged optical layer while in an open position. The hinged optical layer is subsequently positioned in the closed position to align the mirror surface to at least partially reflect a light signal back ...


Isolation And Production Of Tandem Collagen Binding Domain From Clostridial Collagenase Colg And Developments In C1q Reagent Production For Future Molecule Characterization Work, Stephanie Beitle May 2022

Isolation And Production Of Tandem Collagen Binding Domain From Clostridial Collagenase Colg And Developments In C1q Reagent Production For Future Molecule Characterization Work, Stephanie Beitle

Chemical Engineering Undergraduate Honors Theses

This thesis covers a two part project: the production methods to create a double collagen binding domain molecule with a growth factor for wound healing applications and the development of a new in-house production method for isolating C1q from bovine blood. The wound healing molecule was created using transformation, sonication, and purification before being tested via electrophoresis SDS page and Western blots to confirm the molecule’s presence. The C1q in-house production method utilizes an ultrafiltration flow cell rather than dialysis at a critical point in the process, allowing for researchers to not only be able to use a single ...


Evaluating The Effects Of Curing Methods On Bcsa Cement Concrete, Hannah Allen May 2022

Evaluating The Effects Of Curing Methods On Bcsa Cement Concrete, Hannah Allen

Civil Engineering Undergraduate Honors Theses

BCSA cement is a type of cement that makes concrete set up much quicker than typical portland cement concrete. BCSA cement concrete also has a much higher compressive strength than that of portland cement concrete. This study was conducted to determine the effect of different curing conditions on the compressive strength of BCSA cement concrete.


Enhancing Stability Of High-Nickel Cathodes For Lithium-Ion Batteries Through Additive Manufacturing Of Cathode Structure, Matthew Sullivan May 2022

Enhancing Stability Of High-Nickel Cathodes For Lithium-Ion Batteries Through Additive Manufacturing Of Cathode Structure, Matthew Sullivan

Mechanical Engineering Undergraduate Honors Theses

Lithium-ion batteries (LIBs) are currently the best method to store electrical energy for use in portable electronics and electronic vehicles. New cathode materials for LIBs are consistently studied and researched, but few are as promising and attainable as nickel-rich transition metal oxides such as LiNi1-x-yMnxCoyO2 (NMC). NMC materials exist with many different mass ratios, but higher nickel content materials provide higher energy density. With this increase in capacity comes a sacrifice with cyclability, as high-nickel NMC variants are prone to structure collapse, transition metal dissolution, and cracks due to volume change. In this report, mechanical modification of the electrode by ...


Correlation Between The Compatibility Of Anthropometric Design Of Educational Furniture And Neck Pain In The Faculty Of Physical Therapy At Delta University, Amira H. Mohammed Apr 2022

Correlation Between The Compatibility Of Anthropometric Design Of Educational Furniture And Neck Pain In The Faculty Of Physical Therapy At Delta University, Amira H. Mohammed

Delta University Scientific Journal

No abstract provided.


Fine Sand Stabilization Using Metakaolin And Bentonite, Tasneem Moner Foda Eng Apr 2022

Fine Sand Stabilization Using Metakaolin And Bentonite, Tasneem Moner Foda Eng

Delta University Scientific Journal

Soil improvement techniques by adding different materials, such as bitumen, bentonite, lime, etc. are considered to be effective methods to improve soil properties. Soil stabilization methods are now being utilized to overcome the problems of the soil erosion that causes failures at soil structure. Metakaolin is considered to be a promising supplementary construction material which can be used to improve soil properties. The aim of this study is to investigate the effect of mixing Gamasa sand with Metakaolin and Bentonite, Separately. Different mass percentages of materials (0%, 1%, 2%, 5%, 10%, 15%, and 20%) by dry weight of soil were ...


Molecular Characterization Of Blakpc, Blandm1, And Acra Genes In Klebsiella Pneumoniae, Rasha Medhat El-Morsi Apr 2022

Molecular Characterization Of Blakpc, Blandm1, And Acra Genes In Klebsiella Pneumoniae, Rasha Medhat El-Morsi

Delta University Scientific Journal

Abstract

Klebsiella pneumonia (K. pneumonia) harboring blaKPC, blaNDM1, and acrA genes are highly resistant and inactivate all β-lactam antibiotics including carbapenems. This study aimed to molecularly characterization of these enzymes in K. pneumonia isolates. A total of sixty-seven clinical isolates of multiple drug-resistant (MDR) K. pneumonia were collected from different sites of infection, characterized and subjected to antimicrobial susceptibility testing, double-disc diffusion Synergy test (DDST) and Modified-Hodge test (MHT). blaKPC, acrA , blaNDM1 genes amplified by PCR. K. pneumonia isolates carrying these resistance genes were fully identified by 16S rRNA sequencing and the relatedness of isolates was ...


Protective Effects Of Artemisinin On The Placenta Of L-Name Induced Preeclampsia In Rat, Hanan Eissa El Shafey Hanan Apr 2022

Protective Effects Of Artemisinin On The Placenta Of L-Name Induced Preeclampsia In Rat, Hanan Eissa El Shafey Hanan

Delta University Scientific Journal

Background: Preeclampsia (PE) is a pregnancy induced hypertensive disorder and an important cause of maternal and fetal morbidity and mortality. It affects about 3 - 8% of all pregnancies worldwide. Placental factors that arise from placental hypoxia/ischemia set off molecular and cellular cascades, resulting in vascular endothelial dysfunction.

Objective: The aim of study was to clarify the possible protective effect of Artemisinin (ART) on the placenta of L-NAME induced PE in rats and to explore possible involved mechanisms.

Method: Thirty pregnant female Sparge Dawley rats were randomly divided into 3 groups (10 rats/each): The control group, PE-group, and ART ...


Homology Modeling And Docking Studies Of Peroxisomal Carnitine O-Octanoyltransferase, Rania Khalil Apr 2022

Homology Modeling And Docking Studies Of Peroxisomal Carnitine O-Octanoyltransferase, Rania Khalil

Delta University Scientific Journal

Computational docking is used for optimizing known drugs and for defining new binders by simulating their binding mode and affinity. AutoDock tools have been widely cited as necessary tools in structure-based drug design. These methods are rapid enough to declare virtual screening of ligand libraries. We selected a target involved in transferases enzyme class and provided a fully reproducible docking protocol. This paper will show how docking techniques would be an important asset to identify new ligands interactions with transferases. We used Non-3D structures of chosen transferases and built models for the proteins in trying to find putative compounds against ...


Controlling Unequal Surface Energy Results Caused By Test Liquids: The Case Of Uv/O3 Treated Pet, Bilge N. Altay, Paul D. Fleming, Md Arifur Rahman, Alexandra Pekarovicova, Bruce Myers, Cem Aydemir, Arif Karademir Apr 2022

Controlling Unequal Surface Energy Results Caused By Test Liquids: The Case Of Uv/O3 Treated Pet, Bilge N. Altay, Paul D. Fleming, Md Arifur Rahman, Alexandra Pekarovicova, Bruce Myers, Cem Aydemir, Arif Karademir

Articles

Ultraviolet/ozone (UV/O3) treatment has been reported to be an effective method to modify properties such as wettability, adhesion or adsorption of plastic surfaces. The change in the surface is measured by contact angle analysis, which employs liquids and their surface tensions (ST) to estimate the surface energy (SE). We found two different practices in the scientific community: (1) the majority of researchers adopted the ST value of liquids from the literature, while (2) other researchers conducted real-time measurements in the lab under ambient conditions prior to SE estimation. To the best of our knowledge, there is no study ...


Detection And Identification Of Disturbances By Spectral Analysis Of Structure-Borne Noise During The Production Of A Sealing Seam, Felix Kruppa, Lars Meisenbach, Berend Oberdorfer Dr.-Ing., Bernd Wilke Prof. Dr.-Ing. Apr 2022

Detection And Identification Of Disturbances By Spectral Analysis Of Structure-Borne Noise During The Production Of A Sealing Seam, Felix Kruppa, Lars Meisenbach, Berend Oberdorfer Dr.-Ing., Bernd Wilke Prof. Dr.-Ing.

Journal of Applied Packaging Research

When sealing, disturbances or errors can occur that impair the quality of the sealing seam and, in the worst case, lead to leaks. It is therefore important to identify and eliminate defective packages during production and to minimize the elimination by readjusting machine parameters. The aim of this article is the clear identification of seam quality problems on a vertical forming, filling and sealing machine SVE2520 by evaluating process parameters during the manufacturing process. For this purpose, the structure-borne noise is measured for each seal in order to identify not-usual curves. These not-usual curves are related to different disturbances or ...


Accelerated Tensile-Tensile Fatigue Testing Of Long Fiber Thermoplastic Materials, Eric Kerr-Anderson, Sara E. Johnson Apr 2022

Accelerated Tensile-Tensile Fatigue Testing Of Long Fiber Thermoplastic Materials, Eric Kerr-Anderson, Sara E. Johnson

Ramaley Research Celebration

Fatigue characterization is one of the most time consuming and expensive tests that a material must undergo prior to adoption into critical industries and/or uses. Most fatigue testing is conducted by alternating between a low tensile load and a high tensile load until the material fails, which yields a cycle count to failure for a given loading scenario. Compiling a graph with multiple loading scenarios generates a failure threshold that is used to design a part for the number of loading cycles expected to witness during its service life. The studies presented attempted to determine testing methodology to reduce ...


Furniture Build Project, Zoharel Anthony Quinn, Lydia J. Velishek, Hongun Cho, Hannah Matuszak Apr 2022

Furniture Build Project, Zoharel Anthony Quinn, Lydia J. Velishek, Hongun Cho, Hannah Matuszak

Ramaley Research Celebration

A multi-disciplinary team was assembled to design and build composite furniture for customers across campus. The intent was to create lasting, useful items that would showcase interdepartmental work and the flexibility of composites as a design material. Students were required to discuss what image wants to be evoked by the department/entity, pitch customer with 3D printed renderings, design for aesthetics and mechanical performance, and create the furniture. Additional requirements were to incorporate 2 different manufacturing technologies and at least 3 different materials. The result of this work was the design of two items and the creation of one item.


Scooter Solutions: Side Car Companion For 50cc Motor Scooter, Melissa R. Greco, Ashton J. Miloszewicz, John C. Schumacher, Zoharel Anthony T. Quinn, Christian A. Taylor Apr 2022

Scooter Solutions: Side Car Companion For 50cc Motor Scooter, Melissa R. Greco, Ashton J. Miloszewicz, John C. Schumacher, Zoharel Anthony T. Quinn, Christian A. Taylor

Ramaley Research Celebration

Scooter Solutions is a composite structured chassis designed to be connected to a two-wheeled small engine vehicle for the purpose of transporting cargo and passengers. Manufactured using woven carbon fiber/epoxy panels with an XPS foam core and Aluminum 6063-T5 framing, the structure must be light for user practicality and reducing engine wear while maintaining adequate strength for the passenger load and debris deflection while exposed to the natural environment. This product is unique due to its carbon fiber reinforced foam sandwich panels with a two-part epoxy matrix allowing for a lighter, more durable side car than its contemporaries. The ...


Design Of Experiments For Drop Tower Impact And Tensile Welding Of 3d Printed Structures, Kellie L. Hardecopf, Alex Hilo, Regan G. Harvey, Tasha V. Kemna Apr 2022

Design Of Experiments For Drop Tower Impact And Tensile Welding Of 3d Printed Structures, Kellie L. Hardecopf, Alex Hilo, Regan G. Harvey, Tasha V. Kemna

Ramaley Research Celebration

Two studies were conducted during this EYRCM program project; Drop Tower Impact of 3D printed structures and welding studies of 3D printed structures. Most recommendations for fused deposition method (FDM) 3D printer settings revolve around the final aesthetic of the part and do not focus on the strength of the part created. FDM 3D printed parts are typically quite weak in the vertical direction and can be prone to significant damage from impacts. A design of experiments (DOE) was used to determine which settings used to print the part have the greatest effect on the final appearance and impact strength ...


Development Of High Performance Cathodes: From Liquid To Solid-State Batteries, Sixu Deng Apr 2022

Development Of High Performance Cathodes: From Liquid To Solid-State Batteries, Sixu Deng

Electronic Thesis and Dissertation Repository

Lithium-ion batteries (LIBs) are critical for the development of electric vehicles (EVs) because of their higher operating voltages compared to other energy storage technologies. However, the development of start-of-the-art LIBs touched the ceiling because of three main challenges: safety risks, limited energy density, and high cost. Accordingly, all-solid-state lithium-ion batteries (ASSLIBs) have recently emerged as promising alternative batteries for next-generation EVs because of their ability to overcome the drawbacks of conventional LIBs. Whether in conventional liquid LIBs or ASSLIBs, cathode materials are crucial in determining the overall performance. Hence, this thesis focuses on understanding the degradation mechanism of cathode interfaces ...


Detection Of Trace Heavy Metals In Water: Development Of Electrochemical Sensors, Quang Lam, Joel Mututeke Apr 2022

Detection Of Trace Heavy Metals In Water: Development Of Electrochemical Sensors, Quang Lam, Joel Mututeke

Symposium of Student Scholars

The presence of heavy metals in our ecosystem poses significant ecological and physiological consequences. As a result, numerous techniques are developed for the detection of contaminants in aqueous solutions. However, early and trace detection of such contaminants still remains a challenge. Amongst many techniques, electrochemistry driven sensors have shown promise due to their possibility of miniaturization and low-cost. Our research investigates the use of electrically conducting polymer and atomically thin carbon materials as electrodes towards the development of electrochemical sensor. Nanocomposite electrode films have been synthesized and fabricated using in-situ polymerization technique and the relationship between number of cycles of ...


Novel Thermal Coating For High-Speed Airplanes, Abinash Satapathy, Lakshay Battu, Liam Watson, Nazanin Rajabi Apr 2022

Novel Thermal Coating For High-Speed Airplanes, Abinash Satapathy, Lakshay Battu, Liam Watson, Nazanin Rajabi

Symposium of Student Scholars

In comparison to various other materials, Carbon Fiber, specifically Carbon Fiber Reinforced Polymers (CFRP), is pre-eminent amongst other materials for use on aeronautical systems. Due to its high specific strength (strength-to-weight ratio), CFRP is prominent for carrying heavy loads while maintaining a lightweight build. However, when influenced by heat resulting from air resistance, CFRP is known to undergo serious degradation that would significantly decrease the effectiveness of the polymers. To prevent this degradation and maintain the strength of the CFRP, thermal protective layers (TPLs) are designed to shield the CFRP from heat exposure. This research is focused on the examination ...


Effect Of Micro-Structural Dispersity Of Simo Ductile Iron On High Temperature Performance During Static Oxidation, Semen Naumovich Lekakh, Asebi Bofah, Larry A. Godlewski, Mei Li Apr 2022

Effect Of Micro-Structural Dispersity Of Simo Ductile Iron On High Temperature Performance During Static Oxidation, Semen Naumovich Lekakh, Asebi Bofah, Larry A. Godlewski, Mei Li

Materials Science and Engineering Faculty Research & Creative Works

High silicon and molybdenum (SiMo) ductile iron is commonly used for car exhaust systems, and its micro-structural dispersity depends on intrinsic parameters, which include alloy composition and inoculation efficiency, as well as extrinsic factors, such as casting wall thickness and molding material, which define cooling rate during solidification. Micro-structural dispersity is referred to as the degree of heterogeneity of sizes of structural constituencies within the microstructure. A variation in the micro-structural dispersity could impact the high temperature performance of SiMo ductile iron during static oxidation and transient thermo-mechanical loading conditions. In this study, static high temperature tests were performed on ...


Let's Get Serious About It: Plastic-Free Campus Initiative, Geoffrey Kain, Camdyn Doucette, Regan Bossie Apr 2022

Let's Get Serious About It: Plastic-Free Campus Initiative, Geoffrey Kain, Camdyn Doucette, Regan Bossie

Sustainability Conference

On February 23, 2022, the UN agreed to start negotiating a world-first global treaty on plastic waste--since nearly 200 nations unanimously agreed to move toward a legally binding plastics treaty by 2024. In 2019 the UN Environmental Programme report highlighted that "our world is drowning in plastic." As with the climate change crisis (to which plastics production and disposal are also linked), the data resoundingly illustrate the imminent systemic threat that disposable plastics pose to the world's seas, freshwater sources, soils, food supply, air, and species. Nevertheless, plastics production is predicted to rise dramatically over the next 20 years ...


Two-Photon Nanomachining Of A Micromechanically Enhanced Optical Cavity Sensor On An Optical Fiber Tip, Jeremiah C. Williams, Hengky Chandrahalim, Joseph S. Suelzer, Nicholas G. Usechak Apr 2022

Two-Photon Nanomachining Of A Micromechanically Enhanced Optical Cavity Sensor On An Optical Fiber Tip, Jeremiah C. Williams, Hengky Chandrahalim, Joseph S. Suelzer, Nicholas G. Usechak

Faculty Publications

Herein, a two-photon nanostructuring process that is employed to monolithically integrate dynamic three-dimensional (3D) micromechanical features into Fabry–Pérot cavity (FPC) sensors on an optical fiber tip is demonstrated. These features represent a breakthrough in the integration and fabrication capabilities of micro optomechanical devices and systems. The demonstrated dynamic optical surface enables directional thin-film deposition onto obscured areas. The rotation of the dynamically movable mirror to deposit a thin reflective coating onto the inner surfaces of a FPC with curved geometry is leveraged. The reflective coating in conjunction with the dynamically rotatable mirror greatly improves the quality factor of the ...


Limits Of Detection Of Mycotoxins By Laminar Flow Strips: A Review, Xinyi Zhao, Hugh J. Byrne, Christine M. O’Connor, James Curtin, Furong Tian Apr 2022

Limits Of Detection Of Mycotoxins By Laminar Flow Strips: A Review, Xinyi Zhao, Hugh J. Byrne, Christine M. O’Connor, James Curtin, Furong Tian

Articles

Mycotoxins are secondary metabolic products of fungi. They are poisonous, carcinogenic, and mutagenic in nature and pose a serious health threat to both humans and animals, causing severe illnesses and even death. Rapid, simple and low-cost methods of detection of mycotoxins are of immense importance and in great demand in the food and beverage industry, as well as in agriculture and environmental monitoring, and, for this purpose, lateral flow immunochromatographic strips (ICSTs) have been widely used in food safety and environmental monitoring. The literature to date describing the development of ICSTs for the detection of different types of mycotoxins using ...


Enhanced Electrical Property Of Graphite/Al2O3 Composite Fabricated By Reductive Sintering Of Gel-Casted Body Using Cross-Linked Epoxy Polymer, Yoshiaki Funahashi, Yunzi Xin, Kunihiko Kato, Huu Hien Nguyen, Takashi Shirai Apr 2022

Enhanced Electrical Property Of Graphite/Al2O3 Composite Fabricated By Reductive Sintering Of Gel-Casted Body Using Cross-Linked Epoxy Polymer, Yoshiaki Funahashi, Yunzi Xin, Kunihiko Kato, Huu Hien Nguyen, Takashi Shirai

Journal of Advanced Ceramics

In the present study, graphite/alumina composites are fabricated via reductive sintering of gel-casted green bodies with structurally controlled cross-linked epoxy polymers for the first time. The cross-linking degrees of polymers are tuned by the amount ratio of epoxy monomer/polyvinyl alcohol cross-linker utilized in gel-casting process. Superior electrical properties with respect to 5-fold enhanced electrical conductivity and 2-fold higher carrier mobility are successfully achieved in graphite/alumina composite fabricated from cross-linked epoxy polymer, whose phenomenon is attributed to the excellent conductive path in ceramic matrix established by highly uniform network with improved graphitization degree.


Texture And Anisotropy Of Hot-Pressed H-Bn Matrix Composite Ceramics With In Situ Formed Yag, Zhuo Zhang, Xiaoming Duan, Zhuo Tian, Yujin Wang, Lan Wang, Lei Chen, Baofu Qiu, Delong Cai, Peigang He, Dechang Jia, Yu Zhou Apr 2022

Texture And Anisotropy Of Hot-Pressed H-Bn Matrix Composite Ceramics With In Situ Formed Yag, Zhuo Zhang, Xiaoming Duan, Zhuo Tian, Yujin Wang, Lan Wang, Lei Chen, Baofu Qiu, Delong Cai, Peigang He, Dechang Jia, Yu Zhou

Journal of Advanced Ceramics

Textured hexagonal boron nitride (h-BN) matrix composite ceramics were prepared by hot- pressing using different contents of 3Y2O3-5Al2O3 (molar ratio of 3:5) as the sintering additive. During hot-pressing, the liquid Y3Al5O12 (YAG) phase showing good wettability to h-BN grains was in situ formed through the reaction between Y2O3 and Al2O3, and a coherent relationship between h-BN and YAG was observed with [010]h-BN//[1¯11]YAG and (002)h-BN//(321)YAG. In the YAG liquid phase environment formed during hot-pressing, plate-like ...


Achieving Ultra-Broadband Electromagnetic Wave Absorption In High-Entropy Transition Metal Carbides (He Tmcs), Weiming Zhang, Huimin Xiang, Fu-Zhi Dai, Biao Zhao, Shijiang Wu, Yanchun Zhou Apr 2022

Achieving Ultra-Broadband Electromagnetic Wave Absorption In High-Entropy Transition Metal Carbides (He Tmcs), Weiming Zhang, Huimin Xiang, Fu-Zhi Dai, Biao Zhao, Shijiang Wu, Yanchun Zhou

Journal of Advanced Ceramics

Electronic devices pervade everyday life, which has triggered severe electromagnetic (EM) wave pollution. To face this challenge, developing EM wave absorbers with ultra-broadband absorption capacity is critically required. Currently, nano-composite construction has been widely utilized to realize impedance match and broadband absorption. However, complex experimental procedures, limited thermal stability, and interior oxidation resistance are still unneglectable issues. Therefore, it is appealing to realize ultra-broadband EM wave absorption in single-phase materials with good stability. Aiming at this target, two high-entropy transition metal carbides (HE TMCs) including (Zr,Hf,Nb,Ta)C (HE TMC-2) and (Cr,Zr,Hf,Nb,Ta)C (HE ...