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Articles 481 - 510 of 788
Full-Text Articles in Materials Science and Engineering
Methyl Methacrylate Magnetic Molecularly Imprinted Polymer For Gluten Determination, D Limthin, K Chattrairat, P Leepheng, S Wisutthipat, P Gansa, A Klamchuen, D Phromyothin
Methyl Methacrylate Magnetic Molecularly Imprinted Polymer For Gluten Determination, D Limthin, K Chattrairat, P Leepheng, S Wisutthipat, P Gansa, A Klamchuen, D Phromyothin
Journal of Metals, Materials and Minerals
The gluten protein is found in some rice and flour. The allergy of gluten, a little bit of gluten in diet cause long-term damage and dangerous to the body. Even tiny amounts of gluten in diet may bring enormous symptoms. The rapid and simple method for gluten detection is molecularly imprinted polymers (MIP) combined with electrochemical analysis. In addition, magnetic molecularly imprinted polymers (MMIP) as known as Fe3O4 magnetic nanoparticles have used in combination with electrochemical measurement as well to improve the sensitivity of detection. In this work, the MMIP was combined with electrochemical technique. The Fe3O4 magnetic nanoparticles were …
Effects Of Sulfur Vulcanization System On Cure Characteristics, Physical Properties And Thermal Aging Of Epoxidized Natural Rubber, A Larpkasemsek, L Raksaksri, S Chuayjuljit, P Chaiwutthinan, A Boonmahitthisud
Effects Of Sulfur Vulcanization System On Cure Characteristics, Physical Properties And Thermal Aging Of Epoxidized Natural Rubber, A Larpkasemsek, L Raksaksri, S Chuayjuljit, P Chaiwutthinan, A Boonmahitthisud
Journal of Metals, Materials and Minerals
The epoxidized natural rubber (ENR) with 40 mol% epoxidation (ENR-40) was initially prepared via 'in situ' epoxidation of concentrated natural rubber latex with formic acid (1M to isoprene unit) and hydrogen peroxide (0.75 M to isoprene unit) at 50ºC for 8 h. The as-prepared ENR-40 was then cured with three different sulfur vulcanization/curing systems, including conventional (CV), semi-efficiency (semi-EV) and efficiency (EV) systems using tetrabenzylthiuram disulphide (TBzTD) as a non-carcinogenic accelerator on a compression molding machine. The effects of sulfur to accelerator ratio on the cure characteristics, tensile properties (tensile strength, modulus at 300% strain (M300) and elongation at break), …
Investigation On The Tribological Characteristics Of Lubricated Al2o3-Tic (Altic) Surface, S Jitphayomkun, P Dechadilok, D Tungasmita, S Tungasmita
Investigation On The Tribological Characteristics Of Lubricated Al2o3-Tic (Altic) Surface, S Jitphayomkun, P Dechadilok, D Tungasmita, S Tungasmita
Journal of Metals, Materials and Minerals
Lapping process is one of the most important processes in modern hard disk drive manufacturing. Using lubricant in the lapping process does not only reduce the friction but also transfers heat and captures debris away from the surface contacts. The effects of tribological parameters on the lubricant characteristics and friction regime were investigated, using tribometer. The tribological behaviors of the lubricated alumine-titanium carbide (AlTiC) surface with different types of lubricants were also investigated. The coefficient of friction values of stainless steel ball sliding on the lubricated surface exhibited much lower than dry surface. The variation of normal force and sliding …
Recovery Of Recycled Poly(Ethylene Terephthalate) Via Melt Mixing With Poly(Butylene Succinate) And Ultrafine Wollastonite, P Chaiwutthinan, S Chuayjuljit, A Boonmahitthisud, A Larpkasemsuk
Recovery Of Recycled Poly(Ethylene Terephthalate) Via Melt Mixing With Poly(Butylene Succinate) And Ultrafine Wollastonite, P Chaiwutthinan, S Chuayjuljit, A Boonmahitthisud, A Larpkasemsuk
Journal of Metals, Materials and Minerals
Recycled poly(ethylene terephthalate) (R-PET) flakes obtained from postconsumer bottles were melt mixed with poly(butylene succinate) (PBS) or with PBS plus ultrafine wollastonite (2000 mesh) at various compositions on a twin screw extruder, followed by injection molding. The tensile properties, morphology, thermal stability and limiting oxygen index (LOI) of the resulting blends and composites were evaluated. Among the investigated R-PET/PBS blend compositions (20, 30, 40, 50, and 60 wt% PBS), the 60/40 wt% blend exhibited the highest tensile strength and elongation at break, but a lower tensile modulus and thermal stability compared to those of the neat R-PET. This blend was …
Effect Of Carbon Addition On Microstructure And Properties Of Boron-Containing Steel Sintered Under Different Atmospheres, W Koetniyom, P Chantawet, N Tosangthum, M Morakotjinda, T Yotkaew, P Wila, R Tongsri
Effect Of Carbon Addition On Microstructure And Properties Of Boron-Containing Steel Sintered Under Different Atmospheres, W Koetniyom, P Chantawet, N Tosangthum, M Morakotjinda, T Yotkaew, P Wila, R Tongsri
Journal of Metals, Materials and Minerals
High performance sintered steels can be obtained by simultaneous tailoring microstructural feature and improving sintered density. Although sintered hardening is used to produce sintered components with microstructural features providing high tensile strength and hardness, but the performance is limited by low ductility due to the presence of porosity. Near full density can be achieved by liquid phase forming as a result of boron addition to a sintered steel. A liquid formed due to the eutectic reaction of Fe + Fe2B, spreads to interparticle spaces leading to densification improvement. Carbon is an indispensable element for high strength sintered steels. It plays …
Comparison Of Zno Film Prepared By Spray Pyrolysis And Screen Printing Methods, S Suchat, J Potisart, S Supprakob, G Gitgeatpong, P Prachopchok
Comparison Of Zno Film Prepared By Spray Pyrolysis And Screen Printing Methods, S Suchat, J Potisart, S Supprakob, G Gitgeatpong, P Prachopchok
Journal of Metals, Materials and Minerals
Zinc oxide (ZnO) thin films were prepared and compared between spray pyrolysis and screen-printing techniques. The obtained thin films from both methods were annealed at 400, 450, 500 and 550°C in the air for 30 min, then characterized by x-ray diffraction, ultraviolet-visible spectroscopy and four-point probes techniques. Optical transmittance spectra of ZnO thin films prepared by spray pyrolysis methods and screen printing methods were transmitted through thin film in the range from 300 nm to 800 nm. The lowest of sheet resistance of thin films from both techniques were found to develop at the same annealing temperature of 400°C with …
Influences Of Chemical Composition, Microstructure And Bandgap Energy On Photocatalytic And Antimicrobial Activities Of Zno And Ag-Doped Zno By Solution Combustion Technique, O Jongprateep, K Meesombad, R Techapiesancharoenkij, K Surawathanawises, P Siwayaprahm, P Watthanarat
Influences Of Chemical Composition, Microstructure And Bandgap Energy On Photocatalytic And Antimicrobial Activities Of Zno And Ag-Doped Zno By Solution Combustion Technique, O Jongprateep, K Meesombad, R Techapiesancharoenkij, K Surawathanawises, P Siwayaprahm, P Watthanarat
Journal of Metals, Materials and Minerals
Antibacterial agents, self-cleaning materials, H2 generators and air purifiers are among common applications of photocatalysts. ZnO is a low cost material with prominent photocatalytic performance. It is generally accepted that enhancement of photocatalytic activities of powders can be achieved through doping, particle refinement, as well as tailoring of bandgap energy. It has been reported that proper doping of zinc oxide by silver lead to reduction of bandgap energy, promoting electron and hole generation, which results in enhanced photocatalytic performance. The present study aims at synthesizing ZnO and ZnO doped with 2.5, 5, and 10 mol% Ag by solution combustion technique. …
Photopumped Laser Diode Continuous Wave For Optical Gain Determination Of Nd:Yvo4 And Nd:Yag Crystal Medium, J Rajagukguk, W Chaiphaksa, J Kaewkhao, R Hidayat, F Fitrilawati
Photopumped Laser Diode Continuous Wave For Optical Gain Determination Of Nd:Yvo4 And Nd:Yag Crystal Medium, J Rajagukguk, W Chaiphaksa, J Kaewkhao, R Hidayat, F Fitrilawati
Journal of Metals, Materials and Minerals
Photopumped based on laser diode (LD) has designed by employing optical instruments which consist of laser source, optical lens and mirrors as resonator. This setup is aimed to determine of luminescence intensity of laser gain medium based on Nd:YAG and Nd:YVO4 crystals. Laser diode at 805 nm with continuous wave (CW) mode was used as pumping light source with the maximum output power 1 W. The 1064 nm wavelength laser can be obtained through a LD side pumped to laser gain medium, Nd3+ doped YAG and YVO4 crystals respectively. Laser gain medium is placed between intra cavity resonator and generates …
Phase Separation Dynamics And Morphologies Prediction Of Peo-B-Pmma Copolymer By Atomistic And Mesoscopic Simulations, N Chiangraeng, V S. Lee, P Nimmanpipug
Phase Separation Dynamics And Morphologies Prediction Of Peo-B-Pmma Copolymer By Atomistic And Mesoscopic Simulations, N Chiangraeng, V S. Lee, P Nimmanpipug
Journal of Metals, Materials and Minerals
Atomistic and mesoscopic simulations are the most important tools to predict the morphologies of block copolymers. In this study, inter-bead interactions and essential parameters for meso-structure polymeric models were optimized for poly(ethylene oxide)-block-poly(methyl methacrylate) (PEO-b-PMMA; O-b-M) binary systems. A coarse-grained model in a mesoscopic dynamic was used to represent polymeric chain. Gaussian chain is calculated from polymer chain length concerning its characteristic properties. Free energy density was considered by setting suitable time steps and inter-bead interactions for meso-structure simulations. The interaction energies of 1:1, 2:1 and 4:1 molar ratio of O to M segments were 3.67, 4.66, and 5.92, respectively. …
Consideration Of Key Process Parameters For Achieving Robust And Uniform Cutting Of Ti-6al-4v Sheet Metal Using Fiber Laser With Nitrogen Assisted Gas, V Poshyananda, J Darayen, K Tumkhanon, C Puncreobutr, A Khamkongkaeo, B Lohwongwatana
Consideration Of Key Process Parameters For Achieving Robust And Uniform Cutting Of Ti-6al-4v Sheet Metal Using Fiber Laser With Nitrogen Assisted Gas, V Poshyananda, J Darayen, K Tumkhanon, C Puncreobutr, A Khamkongkaeo, B Lohwongwatana
Journal of Metals, Materials and Minerals
In laser cutting, to work on sensitive and intricate materials, such as titanium, requires rigorous control of parameters to achieve the best cutting results due to high power throughput and rapid cutting speed. Titanium is known for severe reaction with oxygen and nitrogen at elevated temperatures, however the more inert argon assist gas is cost prohibitive in commercial application. To achieve cut quality using nitrogen as an assist gas in titanium cutting, careful control is needed to prevent the formation of hard and brittle martensite as well as nitride- and oxide- phases. To better understand the roles of industrial grade …
Self-Striking Red Glass Fabrication At Low Temperature Using Gold Nanoparticles, Y Ruangtaweep, J Kaewkhao, N Sangwaranatee
Self-Striking Red Glass Fabrication At Low Temperature Using Gold Nanoparticles, Y Ruangtaweep, J Kaewkhao, N Sangwaranatee
Journal of Metals, Materials and Minerals
This research is intended to determine the appropriate condition for gold ruby glass production at low temperature. The effects of reducing agent (SnO2 and SeO2) concentrations on coloration of gold nanoparticle (AuNPs) in glass samples have been investigated. The glasses with chemical compositions of SiO2, B2O3, Al2O3, Na2O, CaO, K2O, Sb2O3, SnO2, SeO2 and AuNPs were fabricated by conventional melt-quench technique at 1,200°C in normal atmosphere. The results found that the red glasses were obtained by SnO2 with concentration of 0.5 wt% and SeO2 with concentration of 0.05 wt%. The color of glasses were confirmed by UV-visible spectrophotometer in the …
Effect Of Zinc Oxide Loaded Polyester Fibers On The Color, Mechanical Properties And Antibacterial Action Of Woven Fabric, P Kampeerapappun
Effect Of Zinc Oxide Loaded Polyester Fibers On The Color, Mechanical Properties And Antibacterial Action Of Woven Fabric, P Kampeerapappun
Journal of Metals, Materials and Minerals
The development of antimicrobial fabrics using zinc oxide (ZnO) embedded polyester fibers have been investigated in the present work. The mechanical properties, tear and tensile strength, of the fabrics have been investigated. The ZnO nanoparticles change the mechanical behavior of the fabrics. The antimicrobial activity of the fabrics was assessed through the bacterial reduction method and the materials showed activity against S. aureus. After three replicate standard washing processes, the bacterial inhibition of fabrics with about 99% reduction still remains. The fabrics exhibit great potential to be used as clothing textiles to protect human body against microbial infections.
Biogenic Synthesis And Antibacterial Activity Of Silver Nanoparticles (Agnps) Produced By Phomopsis Sp. Strain Gfpa2, T Sutjaritvorakul, S Chutipaijit
Biogenic Synthesis And Antibacterial Activity Of Silver Nanoparticles (Agnps) Produced By Phomopsis Sp. Strain Gfpa2, T Sutjaritvorakul, S Chutipaijit
Journal of Metals, Materials and Minerals
Silver nanoparticles (AgNPs) have many applications in different fields such as electronic industries, chemical industries, medical diagnostics and detergent products. In this research AgNPs were produced by Phomopsis sp. GFPA2 isolated from zinc mineral rocks, and were successfully synthesized by using fungal culture broth. The biogenic crystals were investigated and identified by field emission scanning electron microscopy (FE-SEM) equipped with energy dispersive X-ray spectroscopy (EDS) and X-ray powder diffraction (XRD). The spectra confirmed that the biogenic crystals were AgNPs, and they are mostly spherical in shape. The crystals were also tested for their antibacterial activity against human pathogenic bacteria such …
Pr3+ Doped Bao:Zno:B2o3:Teo2 Glasses For Laser Host Matrix, R Rajaramakrishna, C Wongdeeying, P Yasaka, P Limkitjaroenporn, N Sangwaranatee, J Kaewkhao
Pr3+ Doped Bao:Zno:B2o3:Teo2 Glasses For Laser Host Matrix, R Rajaramakrishna, C Wongdeeying, P Yasaka, P Limkitjaroenporn, N Sangwaranatee, J Kaewkhao
Journal of Metals, Materials and Minerals
In this work, glasses of composition (30-x)TeO2-30B2O3-10ZnO-30BaO-xPr2O3 x=0.00 0.05, 0.10, 0.50, 1.00, 1.50 mol% have been prepared through the melt quenching method. In order to characterize and explore their structural properties, we measured the density, refractive index of the glass which shows increasing trend with increase in Pr2O3 concentration also FTIR and XRD spectrum is used to study the structural properties of the developed glasses. XRD shows amorphous structure of the prepared glasses. FTIR shows B-O stretching (BO3)- units and Symmetrical stretching vibration of Te-O in TeO4. The electronic states belonging to the 4f configuration of trivalent Pr3+ were determined …
Properties Of Uv-Curable Screen Printing Inks Containing Oligolactide Acrylates, S Kulsiriswad, O Saravari, K Srikulkit
Properties Of Uv-Curable Screen Printing Inks Containing Oligolactide Acrylates, S Kulsiriswad, O Saravari, K Srikulkit
Journal of Metals, Materials and Minerals
This study was aimed at investigating the properties of UV-curable screen printing inks prepared from oligolactide acrylates. Those resultant inks were applied on substrates and cured by UV radiation. Then, properties of the cured ink films were evaluated and compared with a commercial acrylate ink. The degradation temperature of ink film was found at around 436°C. In addition, thus obtained films were glossy and transparent without yellowness. The weathering resistance of ink films tested by a Xenon test chamber for 500 h showed that ink films exhibited acceptable outdoor durability. Discoloration due to the degradation of lactide chain was observed, …
Temperature Dependence Of Dielectric Properties For Bfo-Bto-Bzt Ceramics, S Unruan, M Unruan, R Yimnirun
Temperature Dependence Of Dielectric Properties For Bfo-Bto-Bzt Ceramics, S Unruan, M Unruan, R Yimnirun
Journal of Metals, Materials and Minerals
In this work, bismuth ferrite-barium titanate-barium zirconate titanate (BFO-BTO-BZT) ceramics were prepared using conventional solid state reaction method. The (1-x)BiFeO3-xBaTiO3 at x = 0.24-0.30 and Ba(Zr,Ti)O3 (Zr = 0.5) systems were separately prepared and calcined at 800 and 1250oC, respectively. All pallets were sintered at temperature of 1100oC. After that, the relationship between phase formation, dielectric and magnetic properties were examined. The XRD patterns revealed that more structural symmetry could be observed in all single-phase perovskite ceramics when more BTO concentration was added. The 0.75(0.70BFO-0.30BTO)-0.25BZT ceramic showed highest dielectric constant with high loss measured at low frequency observed, possibly due …
The Effects Of Concentrations Of Zno Nanoparticles On Dewetting Suppression Of Ps Thin Films, J Thapoung, K Tasurin, N Traiphol, N Pangpaiboon
The Effects Of Concentrations Of Zno Nanoparticles On Dewetting Suppression Of Ps Thin Films, J Thapoung, K Tasurin, N Traiphol, N Pangpaiboon
Journal of Metals, Materials and Minerals
Thin polymer films are widely used in industry, such as protective coating, lubricant and electrical insulator, because of their specific properties. However, thin film in nanoscale tends to separate from substrate; this phenomenon is called Dewetting. In this research, a solution of polystyrenes with a concentration of 0.3 wt% in toluene, providing ~ 21 nm polymeric film, was prepared. Zinc-oxide nanoparticles were added in a polystyrene solution as a Dewetting inhibitor. The concentrations of zinc-oxide were varied from 0 - 1.0 wt%. Thin films were cast by a spin casting machine. After annealing at 90˚C in a vacuum oven for …
Recycled Poly(Ethylene Terephthalate)/Polypropylene/Wollastonite Composites Using Pp-G-Ma As Compatibilizer: Mechanical, Thermal And Morphological Properties, P Chaiwutthinan, S Suwannachot, A Larpkasemsuk
Recycled Poly(Ethylene Terephthalate)/Polypropylene/Wollastonite Composites Using Pp-G-Ma As Compatibilizer: Mechanical, Thermal And Morphological Properties, P Chaiwutthinan, S Suwannachot, A Larpkasemsuk
Journal of Metals, Materials and Minerals
Polymers investigated in this study were recycled poly(ethylene terephthalate) (rPET) as a major phase (matrix) and virgin polypropylene (PP) as a minor phase (dispersed phase). Initially, rPET was melt mixed with four different PP contents (10 - 40 wt%) on a co-rotating twin screw extruder and then injection molded. The blend at 30 wt% PP exhibited the highest impact strength and elongation at break and an acceptable tensile strength and Young's modulus. The 70/30 (w/w) rPET/PP blend was then upgraded its compatibility using 1 - 7 parts by weight per hundred of blend resin (phr) of maleic anhydride grafted PP …
A Study Of Microcrystalline Cellulose Prepared From Parawood (Hevea Brasiliensis) Sawdust Waste Using Different Acid Types, P Chuayplod, D Aht-Ong
A Study Of Microcrystalline Cellulose Prepared From Parawood (Hevea Brasiliensis) Sawdust Waste Using Different Acid Types, P Chuayplod, D Aht-Ong
Journal of Metals, Materials and Minerals
Microcrystalline cellulose (MCC) from parawood sawdust (PWS) was successfully prepared by acid hydrolysis method. In this work, parawood sawdust waste was obtained from furniture factory. Initially, PWS was subjected to an alkali pulping and bleaching processes, respectively. After that, the microcrystalline cellulose was prepared from bleached pulp using hydrochloric and sulfuric acid in order to compare the effect of acid type. The parameters for acid hydrolysis process were investigated in terms of reaction time and pulp to acid ratio at constant temperature of 80oC. The properties of obtained MCC such as functional groups, degree of polymerization (DP), crystallinity index (CrI), …
Plasticity Of Light Metal Matrix Composites Under Anodic Polarization, Y B. Unigovski, E M. Gutman, Z Koren, H Rosenson
Plasticity Of Light Metal Matrix Composites Under Anodic Polarization, Y B. Unigovski, E M. Gutman, Z Koren, H Rosenson
Journal of Metals, Materials and Minerals
Light metal matrix composites (MMCs), reinforced with ceramic particles, demonstrate an improvement in strength, elasticity, and wear resistance with regards to matrix alloys. Unfortunately, the plasticity of MMCs is rather low, and their hardness is relatively high. Therefore, there are serious problems in formability and machinability of these materials. In the present study, an improvement in the surface plasticity of such light MMCs as Al 6063-10% SiC (AMC) and Mg AZ31-10% SiC (MgMC) as well as the high-strength Al 7075 T6 alloy under anodic polarization was observed. To assess the effect of polarization on plasticity of composites, the relative Vickers …
Study On Structure And Luminescence Properties Of Labmoo6:Dy3+ Phosphor For Photonic Material Applications, E Kaewnuam, N Wantana, H J. Kim, J Kaewkhao
Study On Structure And Luminescence Properties Of Labmoo6:Dy3+ Phosphor For Photonic Material Applications, E Kaewnuam, N Wantana, H J. Kim, J Kaewkhao
Journal of Metals, Materials and Minerals
Phosphor powder of LaBMoO6:Dy3+ were prepared to investigate the structure, absorption and luminescence properties. The influence of Dy2O3 concentration on these properties were also studied. XRD characterization represents the main structure of phosphor as monoclinic from LaBMoO6 host matrix. From the reflection spectra, Dy3+ in phosphor can absorb more amount of visible light and near infrared radiation with increasing of Dy2O3 concentration. The energy band gap of LaBMoO6 compound was expanded after doping with Dy2O3 which results to the blue shift of absorption edge. The emission spectra perform the strong yellow and blue light emitting under Dy3+ electric dipole (4F9/2 …
Shape-Controlled Synthesis Of Tungsten Oxide Nanostructures And Characterization, K Petsom, A Kopwitthaya, M Horphathum, Y Ruangtaweep, N Sangwaranatee, J Kaewkhao
Shape-Controlled Synthesis Of Tungsten Oxide Nanostructures And Characterization, K Petsom, A Kopwitthaya, M Horphathum, Y Ruangtaweep, N Sangwaranatee, J Kaewkhao
Journal of Metals, Materials and Minerals
Synthesis of tungsten oxide nanorods and nanodisks were reported here using hydrothermal method. Our study is focusing on the role of hexadecyltrimethyl-ammonium bromide (CTAB) and silver ions in tungsten oxide nanostructure formation comparing with typical methods. The sodium tungstate dehydrate was used as a precursor. We found that optimum concentration of CTAB and silver ions can provide a rod-like structure. Meanwhile, nanodisks were observed at the absence of silver ion. In addition, concentration of silver ions introduced to growth solution plays an important role in obtained nanostructure dimension. All prepared nanostructures were characterized by X-Ray diffraction (XRD) for crystalline structures …
Characterization And Photocatalytic Activity Of Titanium Dioxide Deposited On Stainless Steel By Pulsed-Pressure Mocvd, K Wirandorn, N Panyayao, V Siriwongrungson
Characterization And Photocatalytic Activity Of Titanium Dioxide Deposited On Stainless Steel By Pulsed-Pressure Mocvd, K Wirandorn, N Panyayao, V Siriwongrungson
Journal of Metals, Materials and Minerals
Titanium dioxide (TiO2) was deposited on stainless steel 304 by pulsed-pressure metalorganic chemical vapor deposition (PP-MOCVD). Titanium tetraisopropoxide (TTIP) in toluene at the concentration of 0.5 mol% was used as the precursor. The deposition was conducted at the base pressure of 300 Pa and deposition temperatures were varied between 350°C and 400°C. At these deposition temperatures, anatase phase is expected for further photocatalysis study. The deposited TiO2 thin films at the thickness of hundreds nanometers were analyzed using field emission scanning electron microscopy (FESEM) for surface morphology. X-ray diffraction (XRD) was applied for phase analysis. The contact angle was measured …
Effect Of Chromium Content On The Three-Body-Type Abrasive Wear Behavior Of Multi-Alloyed White Cast Iron, J Opapaiboon, M Supradist Na Ayudhaya, P Sricharoenchai, S Inthidech, Y Matsubara
Effect Of Chromium Content On The Three-Body-Type Abrasive Wear Behavior Of Multi-Alloyed White Cast Iron, J Opapaiboon, M Supradist Na Ayudhaya, P Sricharoenchai, S Inthidech, Y Matsubara
Journal of Metals, Materials and Minerals
The effect of Cr content on three-body-type abrasive wear behavior of multi-alloyed white cast iron was investigated. Multi-alloyed white cast irons were prepared with varying Cr content from 3-9 mass% under basic alloy composition. Annealed specimens were hardened from 1323 and 1373K austenitizing and tempered at three levels of temperatures which were at maximum hardness (HTmax), lower and higher than that at HTmax (L-HTmax and H-HTmax). A rubber wheel wear tester was used to evaluate the abrasive wear resistance. The hardness and volume fraction of the retained austenite (Vγ) varied depending on Cr content and heat treatment condition. The linear …
Super Hydrophobicity Of Sputtered Ptfe Films On Nanotextured Aluminum Surface, S Lumjeak, T Lertvanithpo, P Limnonthakul, M Horprathum, P Songsirirtthigul
Super Hydrophobicity Of Sputtered Ptfe Films On Nanotextured Aluminum Surface, S Lumjeak, T Lertvanithpo, P Limnonthakul, M Horprathum, P Songsirirtthigul
Journal of Metals, Materials and Minerals
In this research, the superhydrophobic surface was prepared by using the polytetrafluoroethylene (PTFE) thin films which deposited on aluminum (Al) nanotextures. The Al nanotextures have been prepared under different alkaline-treatment concentrations, and deposited with the PTFE thin films by the RF magnetron sputtering technique. During the alkaline treatments, the Al surface was immersed in the potassium hydroxide (KOH) solution with the concentrations of 1 mM to 0.10 mM. Then, the samples of PTFE films were deposited on Al nanotextures were characterized; the crystal structures, chemical compositions, physical morphologies, and surface roughness by photoelectron spectroscopy (PES), field-emission scanning electron microscopy (FE-SEM) …
Aluminium-Sic Composite: Study Of Its Mechanical Properties, D Sánchez-García, A Herrera-Vázquez, J Hinojosa-Torres
Aluminium-Sic Composite: Study Of Its Mechanical Properties, D Sánchez-García, A Herrera-Vázquez, J Hinojosa-Torres
Journal of Metals, Materials and Minerals
Cylindrical specimens with geometries and sizes, in agreement with the standard of American Society for Testing Materials (ASTM), they were used to characterize the tension behaviour of the composite. A significant effect of the SiC shape/size on the tensile behaviour of aluminium-based composite was observed, caused by the differences between the superheat (993 K) and the mould temperatures (333 K, 473 K, 623 K) in the melting practice. Ultimate tensile stress and Fracture Toughness factor for the composite showed a numerical advantage over the corresponding ones to the aluminium at a solidification speed of 82.5 K·s-1. At the mould temperature …
A Comparative Study Of Nanofibrillated Cellulose And Microcrystalline Cellulose As Reinforcements In All-Cellulose Composites, S Tanpichai
Journal of Metals, Materials and Minerals
The reinforcing abilities of nanofibrillated cellulose (NFC) and microcrystalline cellulose (MCC) in composites were investigated and compared. All-cellulose composites were prepared using the dissolved MCC as the matrix, and NFC and MCC were introduced as the reinforcing phase. With the addition of MCC, tensile strength of the composites decreased; on the other hand, the higher tensile strength of the composites with NFC was found with increasing a NFC content. Strong interfacial interaction between the matrix and reinforcing phase could be obtained at a low content of the reinforcement was observed. At a higher content of the reinforcement the fiber pull-out …
Effect Of Tempering Temperature On Microstructure And Mechanical Properties Of Low Alloy Steel In Quenched Tempered Conditions, V Yadav, A K. Singh, G Sahoo
Effect Of Tempering Temperature On Microstructure And Mechanical Properties Of Low Alloy Steel In Quenched Tempered Conditions, V Yadav, A K. Singh, G Sahoo
Journal of Metals, Materials and Minerals
The effect of tempering temperature on the microstructure and mechanical properties of a low alloy steel has been investigated using optical microscopy, hardness testing and Charpy V-notch impact testing at -20°C, -40°C and -60°C. At first, the laboratory based study revealed that tempering the specimens at 650°C resulted in lowest hardness with highest impact energy. Based on this, the heat-treated industrial steel showed sufficiently high toughness after Charpy V-notch impact testing at -40°C. Fractography after impact testing showed predominately ductile dimple rupture in the sample tempered at 650°C. The presence of decomposed martesitic laths in prior austenite was noticed in …
Wear Properties Of Boron Added High Strength Low Alloy (Hsla) Sae 8620 Steel, M Musa, A G. Mohammed, A Muhammad
Wear Properties Of Boron Added High Strength Low Alloy (Hsla) Sae 8620 Steel, M Musa, A G. Mohammed, A Muhammad
Journal of Metals, Materials and Minerals
The High Strength Low Alloy (HSLA) SAE 8620 steel with different contents of boron in ppm rate used in bearings, automotive gearing and automotive body components applications were studied. We report the relationship between wear properties, microstructural characterization and hardness properties of the steel. The steel chemical composition is selected to obtain relatively high mechanical properties with different boron contents. Increasing the normalization temperature and boron content, shows ferrite grain-size becomes larger when compared to lower normalization temperatures and boron content. With differences in boron content, only 2 HBN were measured from the average hardness of 3.3 ppm and 13.5 …
Crystalline Silica In Compressed Rice Hull Coke Ash, T Okutani, E Ichikawa, H Nagai, T Hashimoto, T Makihata
Crystalline Silica In Compressed Rice Hull Coke Ash, T Okutani, E Ichikawa, H Nagai, T Hashimoto, T Makihata
Journal of Metals, Materials and Minerals
Compressed rice hull coke was produced by compressing rice hulls ground to less than 200 µm diameter at 1.22x106 N/m2 and 310˚C with an oxygen deficient atmosphere. The compressed rice hull coke had a 5 cm outer diameter, a 1.5 cm inner diameter and 35 cm length. The density of the coke is 1.2, and, the heat value is 16570 kJ·kg-1. In this study, 2 kg coke was combusted at the average temperature of 850˚C for 104 min with a maximum temperature of 860˚C. The ash was colored black-grey, and the form remained coke. The ash contained 95.4% silica with …