Oxidation Behaviour Of Mn-Co Spinel Coating On Aisi 430 Ferritic Stainless Steel With And Without Cu In Ar-Co -H O Atmosphere,
2023
Chulalongkorn University
Oxidation Behaviour Of Mn-Co Spinel Coating On Aisi 430 Ferritic Stainless Steel With And Without Cu In Ar-Co -H O Atmosphere, Thammaporn Thublaor, Padungaut Srihathai, Panya Wiman, Angkana Muengjai, Somrerk Chandra-Ambhorn
Journal of Metals, Materials and Minerals
AISI 430 ferritic stainless steel is a promising candidate for utilising as interconnects of solid oxide fuel cells due to its cost effectiveness and durability. Many methods for applying coating on steel substrates have been developed in order to decrease the degradation of steel due to oxidation rate and chromium volatile problems. Manganese-cobalt spinel exhibits high conductivity, thermal expansion compatible with ferritic stainless steels, and forms a barrier to inhibit chromium migration during oxidation. Copper can be added to manganese-cobalt spinel to improve electrical conductivity of the spinel coating. This work investigated oxide scale formation and oxidation rate of Mn-Co …
Production Of Autoclaved Lightweight Concretes Using Pottery Stone And Bagasse Ash,
2023
Chulalongkorn University
Production Of Autoclaved Lightweight Concretes Using Pottery Stone And Bagasse Ash, Sutthima Sriprasertsuk, Saijit Daosukho
Journal of Metals, Materials and Minerals
This study investigated the influence of pottery stone and bagasse ash on the mechanical features of autoclaved lightweight concrete. Pottery stone is a natural resource of igneous rock weathering commonly exists with white clay, feldspar and limestone. This raw material is mainly composed of quartz and mica that has been used for the production of ceramic products. Bagasse ash is a waste product of the sugar refining process that causes serious environmental pollution. Pottery stone and bagasse ash waste were physically characterized and partially substituted by the weight of cement in lightweight concrete with the addition of aluminium powder at …
Paper-Based Colorimetric Sensor For Mercury Ion Detection Using Smartphone Digital Imaging,
2023
Chulalongkorn University
Paper-Based Colorimetric Sensor For Mercury Ion Detection Using Smartphone Digital Imaging, Pakorn Preechaburana, Somsak Sangnuy, Supaluck Amloy
Journal of Metals, Materials and Minerals
In this research, we have developed a colorimetric paper-based sensing platform for the determination of mercury ion (Hg2+) using gold nanoparticles (AuNPs). To evaluate the selectivity in the response to a special target, urea is used as recognizing ligands on AuNPs for selective sensing Hg2+. Colorimetric readings in the presence of various environmentally relevant metal ions, such as Na+, K+, Zn2+, Pb2+, and Hg2+, were also studied. The results show that amongst all the tested metal ions, the SPR peaks are located at 525 nm except in the case of the present of Hg2+, in which is red shifted to …
Dielectric Properties And Electrochemical Behavior Of Graphene Oxide Derived From Myanmar Coal Minerals,
2023
Chulalongkorn University
Dielectric Properties And Electrochemical Behavior Of Graphene Oxide Derived From Myanmar Coal Minerals, Min Maung Maung, Chan Nyein Aung, Gasidit Panomsuwan, Khin Khin Win
Journal of Metals, Materials and Minerals
Graphene Oxide (GO) metal nanocomposites make up an emerging class of advanced materials and enhance material functionality to obtain multifunctional properties and working towards superior performance of energy storage devices. GO was derived from Myanmar coal minerals using Modified Hummer method. The silver and nickel nanoparticles were used as metal ions or metal nanoparticles to form GO nanocomposites. Their characteristics were identified by XRD, SEM and Raman Spectroscopy. The energy gap of GO and GO composites was also investigated by the aid of UV-Vis spectroscopy. The dielectric constant is measures of the amount of electrical energy that can be stored …
A Review On New Cobalt-Free Cathode Materials For Reversible Solid Oxide Fuel Cells,
2023
Chulalongkorn University
A Review On New Cobalt-Free Cathode Materials For Reversible Solid Oxide Fuel Cells, Sedat Akkurt, Can Sindiraç, Tuğçe Özmen Egesoy, Emre Erğen
Journal of Metals, Materials and Minerals
The exponential growth in the requirement of fuel cells and batteries leads to increased demand for cobalt due to its common use in high-performance Li-ion batteries and high-temperature fuel cells/electrolyzers. This sharp increment in demand raises concern about the availability of limited reserves of cobalt which can impact the price of cobalt. Moreover, the geographic limitations of cobalt resources may endanger the whole supply chain. In addition to all those, huge moral issues of cobalt mining are also another problem. Hence, leading battery, fuel cells and electrolyzer manufacturers are looking for sustainable alternatives to reduce cobalt dependency. A more specific …
High-Temperature Oxidation Resistance Of Craln Thin Films Prepared By Dc Reactive Magnetron Sputtering,
2023
Chulalongkorn University
High-Temperature Oxidation Resistance Of Craln Thin Films Prepared By Dc Reactive Magnetron Sputtering, Nirun Witit-Anun, Adisorn Buranawong
Journal of Metals, Materials and Minerals
CrAlN thin films were prepared by using the reactive DC unbalanced magnetron sputtering method from the single alloy target on a silicon substrate. The effect of annealing temperature in the air which ranges from 500℃ to 900℃ for 1 h on phase structure, film composition, surface morphology, microstructure, and hardness was investigated by XRD, EDS, FE-SEM, and Nanoindentation techniques, respectively. The high-temperature (up to 900℃) oxidation resistance of the thin film was also evaluated. The result shows that solid solutions of (Cr,Al)N with (111), (200), and (220) planes for the as-deposited film and no oxide phase were found after annealing …
Effect Of Annealing Temperature On The Tio Anodized Films Properties For Dental Implant Application,
2023
Chulalongkorn University
Effect Of Annealing Temperature On The Tio Anodized Films Properties For Dental Implant Application, Phanawan Whangdee, Wittawat Saenrang, Nampueng Pangpaiboon, Pristanuch Masakul, Dujreutai Pongkao Kashima
Journal of Metals, Materials and Minerals
The TiO2 anodized films generated at low current density after annealing are good candidates for surface coating, as a hydrophilicity is a crucial characteristic that determines dental implant applications. In this study, the hydrophilicity of TiO2 anodized films annealed at various temperatures was examined. It was found that increasing the annealing temperature during the anodization procedure improves the hydrophilicity of the TiO2 anodized films. This is related to the evolution of the TiO2 anodized film structure produced by raising the annealing temperature, which converts the TiO2 anodized amorphous phase to rutile phases. Moreover, increased annealing temperature results in more oxygen …
Structure And Properties Of The Contact Wire Obtained By Ecap With Forming,
2023
Chulalongkorn University
Structure And Properties Of The Contact Wire Obtained By Ecap With Forming, Denis Alekseevich Aksenov, Rashid Nailevich Asfandiyarov, Georgy Iosifovich Raab, Yulia Ramilevna Sementeeva
Journal of Metals, Materials and Minerals
This paper presents the results of the development of a promising method for manufacturing contact wires for high-speed railways. The developed method is based on the principles of severe plastic deformation and the combination of metal-forming processes. The solution obtained is a combination of equal-channel angular pressing with the forming of a shaped contact wire with a cross-sectional area of 120 mm2 in one tooling. A feature of the work is that with the help of a comprehensive study by the methods of finite element computer modeling and a physical experiment, not only the stress-strain state of the deformation zone …
Multipurpose Fluorescent Carbon Dots From Papaya Seed Waste As Sensing Materials For Cu2+ Detection And Diethyl Ether Vapor Sensor Via Electronic Nose System,
2023
Chulalongkorn University
Multipurpose Fluorescent Carbon Dots From Papaya Seed Waste As Sensing Materials For Cu2+ Detection And Diethyl Ether Vapor Sensor Via Electronic Nose System, Nichaphat Thongsai, Aphinya Chuiduang, Sumana Kladsomboon, Insik In, Peerasak Paoprasert
Journal of Metals, Materials and Minerals
Herein, carbon dots (CDs) as biocompatible, fluorescent carbon-based nanomaterials were synthesized from papaya seed waste as renewable carbon sources for the first time via a facile acid pyrolysis method. The papaya seed-derived CDs showed blue fluorescence emission under UV light (365 nm) with a quantum yield of 2.74%, and contained oxygen-, and nitrogen- containing functional groups. Due to their surface functionality, the CDs have a great potential for using as fluorescence sensing probe in metal ion sensing application. The CD solution exhibited the most selective detection to Cu2+ as presented the highest fluorescence quenching with the limit of detection (LOD) …
Synthesis And Characterization Of Electron Beam Irradiated Glutinous Rice Husk-Derived Biochar And Activated Carbon For Aqueous Electrochemical Capacitors,
2023
Chulalongkorn University
Synthesis And Characterization Of Electron Beam Irradiated Glutinous Rice Husk-Derived Biochar And Activated Carbon For Aqueous Electrochemical Capacitors, Kittapas Kitsanadecha, Charlita Sinmak, Patchanan Onchomchan, Kanit Hantanasirisakul, Tanagorn Kwamman, Suranan Anantachaisilp
Journal of Metals, Materials and Minerals
Glutinous rice husk, an abundant agricultural biowaste in Thailand, was pretreated with high energy electron beam irradiation (EBI) at doses of 500 kGy, 1000 kGy, and 1500 kGy prior to fabrication into biochar by carbonization at 500℃ under nitrogen atmosphere. The biochar was then treated with KOH and subsequently heated at 800℃, yielding activated carbon (GAC). The physical, chemical, and electrochemical properties of the as-received biochar (GB) and activated carbon (GAC) were investigated. Scanning electron microscopic images (SEM) suggested that biochar irradiated with 1500 kGy (GB-1500) has the highest porosity compared to the other samples. The electrochemical properties of GB …
Polyol Method And Surface Functionalization Of Silver Nanowires Using Bovine Serum Albumin For Surface-Enhanced Raman Scattering Application,
2023
Chulalongkorn University
Polyol Method And Surface Functionalization Of Silver Nanowires Using Bovine Serum Albumin For Surface-Enhanced Raman Scattering Application, Khoa Tien Cao, Khoi Khac Tran, Hue Thi Do
Journal of Metals, Materials and Minerals
Silver nanowires (AgNWs) with diverse applications are attracting the attention of many researchers around the world. In this study, we applied the polyol method to synthesize AgNWs based on Polyvinyl-pyrrolidone (PVP) average molecular weight of 360,000, ethylene glycol (EG), and AgNO3 precursor with a fresh AgCl preparation. To synthesize this material we first investigate optimal parameters through the influence of reaction temperature, time of creating AgNWs using plasmon absorption spectroscopy, and scanning electron microscope (SEM) images. The obtained AgNWs are high efficiency, large aspect ratio, and good dispersion in the solution. This sample continues to be conducted to surface functionalization …
Dispersion Mechanism Of Nanoparticles And Its Role On Mechanical, Thermal And Electrical Properties Of Epoxy Nanocomposites - A Review,
2023
Chulalongkorn University
Dispersion Mechanism Of Nanoparticles And Its Role On Mechanical, Thermal And Electrical Properties Of Epoxy Nanocomposites - A Review, Baljit Singh, Akash Mohanty, Amit Kumar Srivastava, Ajay Singh
Journal of Metals, Materials and Minerals
The combined effect of nano-reinforcements on the mechanical performance of nanocomposites, which are a novel class of epoxy matrix hybrid nanocomposites containing multiwall carbon nanotubes (MWCNT), graphene, and nanodiamonds (NDs), is drawing substantial attention from many research communities. The discussion concentrates on the dispersion techniques adopted for the preparation of epoxy composites containing different types of nanoparticles (3-D fillers, nanofibers, nanotubes, and plate-like fillers). This review paper covers the electrical, thermal, and mechanical properties of carbon nanotubes (CNTs), graphene, and nanodiamond-reinforced epoxy nanocomposites and correlates them with the topographical features, morphology, weight fraction, dispersion state, and surface functionalization of CNTs, …
Fabrication Of Granular Foam Glass Aggregates From Soda Lime Silicate Glass Waste,
2023
Chulalongkorn University
Fabrication Of Granular Foam Glass Aggregates From Soda Lime Silicate Glass Waste, Pat Sooksaen, Phumin Prakaisri, Pattraporn Teerapatpanid, Pathompong Puathawee
Journal of Metals, Materials and Minerals
Granular foam glass aggregates were fabricated from a soda lime silicate glass waste which utilized crude glycerol as a foaming agent and sodium silicate as a binder. The granulation and the foaming process were carried out by a granulator and an electric rotary furnace. The study investigated at first the foaming behavior of different foam glass formulations at various sintering temperatures. Three compositions were formulated which utilized glass powder at 85 wt%, 90 wt%, and 95 wt%, respectively. Sintering was carried out at temperatures from 800℃ to 1200℃ to evaluate for the foaming and melting characteristics. Foam glass with 90% …
Study Of Corrosion Properties Of Carbon Steel, 304 And 316l Stainless Steels In Sulfuric Acid And Their Degradation Products,
2023
Chulalongkorn University
Study Of Corrosion Properties Of Carbon Steel, 304 And 316l Stainless Steels In Sulfuric Acid And Their Degradation Products, Eakapoj Khamme, Rachsak Sakdanuphab
Journal of Metals, Materials and Minerals
In this study, corrosion properties of carbon steel and stainless steels, and degradation of sulfuric acid by the corrosion mechanism are presented. Carbon steel (CS), 304 stainless steel (SS304), and 316L stainless steel (SS316L) specimens were analyzed through their electrochemical response by using a potentiostat measurement. The specimens were submerged in concentrated 98 wt.% of H2SO4 acid for 0 day to 60 day. The degradation of H2SO4 was determined by its volume change, turbidity, and color due to the corrosion mechanism. Corrosion rate of CS, SS304 and SS316L specimens are 43.237 mm/year, 0.420 mm/year and 0.086 mm/year, respectively. After 60 …
Microstructure And Mechanical Properties Of 0.2c-3.9al-1.12mn-0.3mo Δ-Trip Steel As A Function Of Isothermal Bainitic Transformation Temperature,
2023
Chulalongkorn University
Microstructure And Mechanical Properties Of 0.2c-3.9al-1.12mn-0.3mo Δ-Trip Steel As A Function Of Isothermal Bainitic Transformation Temperature, Mahsa Gholambargani, Yahya Palizdar, Ali Khanlakhani, Ali Khanlakhani
Journal of Metals, Materials and Minerals
The present investigation employed a two-stage heat treatment on a δ-transformation-induced plasticity (TRIP) steel comprising 0.2C–4Al–1.2Mn–0.3Mo (wt%). The mechanical and microstructural characteristics that result from varied isothermal bainitic transformation (IBT) temperatures following inter-critical annealing at 820℃ for 10 min are thoroughly analyzed. The microstructure of the steels consisted of δ-ferrite, α-ferrite, bainitic ferrite, retained austenite (RA), and martensite, resulting in an optimum combination of the ultimate tensile strength (UTS) and total elongation (TE). The results of the investigation showed that IBT temperature had an effect on the stability of RA and the martensitic transition. Due to the increased mechanical stability …
Improvement Of Specific Capacity Of Lithium Iron Phosphate Battery By Increasing The Surface Area And Electrical Conductivity Of Cathode Electrode Using Graphene Foam,
2023
Chulalongkorn University
Improvement Of Specific Capacity Of Lithium Iron Phosphate Battery By Increasing The Surface Area And Electrical Conductivity Of Cathode Electrode Using Graphene Foam, Phurida Kokmat, Patiphat Matsayamat, Kunaree Wongrach, Piyaporn Surinlert, Akkawat Ruammaitree
Journal of Metals, Materials and Minerals
Lithium iron phosphate (LFP) is widely used as an active material in a cathode electrode for lithium-ion batteries (LIBs). LFP has many remarkable properties such as high working voltage and excellent thermal stability. However, it suffers with slow ion diffusion and low electrical conductivity. Graphene foam has many outstanding properties such as large surface area and great electrical conductivity. These properties are suitable for improving the cathode electrode. In this work, the graphene foam was synthesized by chemical vapor deposition. The cathode electrode was prepared by dropping the LFP on the graphene foam. We found that the specific capacity of …
Synthesis Of Carbon Nanowalls By Oxy-Acetylene Torch Method,
2023
Chulalongkorn University
Synthesis Of Carbon Nanowalls By Oxy-Acetylene Torch Method, Bauyrzhan Zhumadilov, Aidar Kenzhegulov, Renata Nemkayeva, Gulmira Partizan, Yerassyl Yerlanuly, Maratbek Gadbullin
Journal of Metals, Materials and Minerals
This work presents a relatively new method for the synthesis of carbon nanowalls (CNWs) based on oxy-acetylene torch as a function of deposition time. The morphological and structural properties of the obtained CNW films were studied by scanning electron microscopy and Raman spectroscopy. Changes in the morphology and structural properties of the CNW films depending on the synthesis time were revealed. Shorter growth times lead to the formation of thinner CNW films with a dense labyrinth-like structure, while longer growth times lead to thicker CNW films with a petal-like structure. In addition, this study opens up the possibility of synthesizing …
Sustainable Innovation In Ballistic Vest Design: Exploration Of Polyurethane-Coated Hemp Fabrics And Reinforced Sandwich Epoxy Composites Against 9 Mm And .40 S&W Bullets,
2023
Chulalongkorn University
Sustainable Innovation In Ballistic Vest Design: Exploration Of Polyurethane-Coated Hemp Fabrics And Reinforced Sandwich Epoxy Composites Against 9 Mm And .40 S&W Bullets, Tannachart Wantang, Manop Pipathattakul, Fasai Wiwatwongwana
Journal of Metals, Materials and Minerals
This research aimed to evaluate the bulletproof capabilities of hemp fabrics and optimize the design factors for effective ballistic vests. Three main aspects were investigated: enhancing toughness with polyurethane-coated hemp fabrics, determining optimal placement of fabric-reinforced hemp epoxy composites in various configurations, and identifying the optimal number of fabric layers for performance against 9 mm and .40 S&W bullets. Penetration depth was measured in ballistic gelatin to analyze the results. The study showed strong statistical correlations between factor variables and penetration depth shifts. The most effective strategies included polyurethane-coated hemp on all layers and increased layering. The ammunition of 9 …
Structural And Electrical Properties Of 0.98(Ko0.5na0.5onboo3)-0.02(Bio0.5nao0.5tioo3) Ceramics,
2023
Chulalongkorn University
Structural And Electrical Properties Of 0.98(Ko0.5na0.5onboo3)-0.02(Bio0.5nao0.5tioo3) Ceramics, Swayam Aryam Behera, Sugato Hajra, Swati Panda, Ali Amanat, P. G. R. Achary
Journal of Metals, Materials and Minerals
In the present communication, lead-free ceramics having composition 0.98(K0.5Na0.5NbO3)-0.02(Bi0.5Na0.5TiO3) were synthesized by a high-temperature solid-state reaction route. The Rietveld refinement for the 0.98KNN-0.02BNT reveals an MPB with phase fraction Amm2 (87.76 %) and Pm-3m (12.27%). The SEM study predicted a mean diameter of 0.98KNN-0.02BNT grains as 0.52µm±0.19. The 0.98KNN-0.02BNTceramic displayed a typical hysteresis loop with a remnant polarisation(Pr) of 7.0 μC/cm2, saturation polarization (Ps) of 16 μC/cm2, and a coercive field (Ec) of 26 kV/mm. The electrical, Raman spectra, dielectric, and hysteresis loop study supported a morphotropic phase boundary. The synthesized KNN-BNT lead-free material can be an excellent material for …
Mechanical Properties Of Zrb2 Ceramics Determined By Two Laboratories,
2023
Missouri University of Science and Technology
Mechanical Properties Of Zrb2 Ceramics Determined By Two Laboratories, Jeffrey J. Swab, Jecee Jarman, William Fahrenholtz, Jeremy Lee Watts
Materials Science and Engineering Faculty Research & Creative Works
The mechanical properties for zirconium diboride (ZrB2) were measured at two laboratories and compared. Two billets of ZrB2 were prepared by hot-pressing commercial powder. The relative densities of the billets were >99% and with an average grain size of 5.9 ± 4.5 µm. Both laboratories prepared American Society for Testing and Materials (ASTM) C1161 B-bars for strength and ASTM C1421 bars with notch configuration A for fracture toughness. Specimens were machined by diamond grinding at the Army Research Laboratory (ARL) and electrical discharge machining (EDM) at Missouri S&T. Strength bars tested at Missouri S&T were polished to a.25 μm finish …
