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Articles 421 - 450 of 665
Full-Text Articles in Materials Science and Engineering
Formation Of Phase Icosahedral And Decagonal Quasicrystalline Alloys Al62,2cu25,3fe12,5/Al65ni15co20 Influence On The Oxidation, Lcla Jamshidi, Rj Rodbari, L Nascimento
Formation Of Phase Icosahedral And Decagonal Quasicrystalline Alloys Al62,2cu25,3fe12,5/Al65ni15co20 Influence On The Oxidation, Lcla Jamshidi, Rj Rodbari, L Nascimento
Journal of Metals, Materials and Minerals
In this article we will cover a study of the formation of icosahedral and decagonal phases two quasicrystals Al62,2Cu25,3Fe12,5 And Al65Ni15Co20,and the influence of oxidation in this alloy. For this purpose research used the diffraction of X-ray (XRD), scanning electron microscopy (SEM)/Energy Dispersive Spectroscopy (EDS), Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TG) .The results displayed found aspects of morphological structural as well as the surface of the two compositions of quasicrystals, these were prepared and obtained in electric arc furnaces and induction and arc. Oxidation of Al62,2Cu25,3Fe12,5 alloy, intermetallic phases presented with combinations of alloying elements and above 675C …
Properties In Hardness Of Al-Cu Couples Diffused At 813 K, J Hinojosa-Torres, Jm Aceves-Hernández
Properties In Hardness Of Al-Cu Couples Diffused At 813 K, J Hinojosa-Torres, Jm Aceves-Hernández
Journal of Metals, Materials and Minerals
Al-Cu couples were heated to 813 K during 200, 320 and 480 hours. The heat treatment conditions caused the welding of the metals. After the mentioned conditions, it was observed the formation of two contiguous plates like (~15 to 30 micrometres, width) in parallel direction to the contact section. These plates like were chemically identified and its compositions corresponded to the h2 (CuAl) phase and to the q (CuAl2) phase of the aluminium-copper system. The measurements of micro hardness that were carried out on these plates like gave values of 620HV0.05 and 500HV0.05 (on the average) respectively. In the Cu-rich …
Processing Of Nano Fillers In Nitrile Rubber A Novel Technique, Abitha V. K., Ajay Vasudeo Rane, K. Rajkumar
Processing Of Nano Fillers In Nitrile Rubber A Novel Technique, Abitha V. K., Ajay Vasudeo Rane, K. Rajkumar
Journal of Metals, Materials and Minerals
Dispersion of various nano fillers like Nano silica, nano clay, Nano TiO2, etc has been attempted in NBR rubbers using new technique of dispersion. Liquid NBR is taken as dispersion media for nano fillers in polymer matrix and polymer nano composites were characterized by Rubber Process Analyzer [RPA-2000, USA]. The dispersion of the nano fillers were investigated by XRD, SEM-EDS. The effect of increasing nano- fillers on mechanical properties like tensile strength, modulus and Elongation at break was studied. Hot air ageing of polymer nano composites was also studied.Dispersion of various nano fillers like Nano silica, nano clay, Nano TiO2, …
Effect On Mechanical Properties Of Aluminium Alloy Composites On Adding Ash As Reinforcement Material, Mohd Zafaruddin Khan, Mohd Anas, Ather Hussain, Md Irshadul Haque, Kamran Rasheed
Effect On Mechanical Properties Of Aluminium Alloy Composites On Adding Ash As Reinforcement Material, Mohd Zafaruddin Khan, Mohd Anas, Ather Hussain, Md Irshadul Haque, Kamran Rasheed
Journal of Metals, Materials and Minerals
To produce Al-matrix cast particle composites, wettability of the ceramic particles by liquid Al is essential. To improve wettability of the solution, few elements such as Mg and Si are added into Al melt to incorporate the ceramic particles. The present investigation has been focussed on the utilization of abundant available industrial waste such as fly ash and bagasse ash in useful manner by dispersing it into Eutectic Al-Si alloy LM6 Containing 10.58% Si to produce composites by liquid casting route. The mechanical properties such as Brinell Hardness and Ultimate tensile strength has been investigated. The test results of the …
Effect Of Temperature Dropping During Solution Treatment In Rejuvenation Heat Treatment On Final Microstructures Of Udimet 520, Kritsayanee Saelor, Panyawat Wangyao
Effect Of Temperature Dropping During Solution Treatment In Rejuvenation Heat Treatment On Final Microstructures Of Udimet 520, Kritsayanee Saelor, Panyawat Wangyao
Journal of Metals, Materials and Minerals
Udimet 520 is a low precipitation hardened nickel-based superalloy, which is made to be turbine blades at high temperature. After long-term service, the microstructure of the turbine blades could be degraded, then the mechanical properties are worse than the new ones. The rejuvenation heat treatment of degraded turbine blades, which are made of cast Udimet 520, is following by solution treatment at 1,121C / 4 hours and then double aging processes, which include primary aging at 843 C / 24 hours and secondary aging at 760 C / 16 hours, respectively.However, in practical reheat treatment processes, the temperature during solution …
Effect Of Tig Welding Parameters On Strain-Age Cracking In Joining Nickel-Based Superalloy, Gtd-111 With Inconel 625, Athittaya Athiroj, Panyawat Wangyao
Effect Of Tig Welding Parameters On Strain-Age Cracking In Joining Nickel-Based Superalloy, Gtd-111 With Inconel 625, Athittaya Athiroj, Panyawat Wangyao
Journal of Metals, Materials and Minerals
Excellent mechanical properties at high temperature of nickel-based superalloys brought them to extensive application in severe operating conditions. However, the great mechanical properties deteriorate after long-term exposure to high temperature and it frequently causes failure of the component e.g. cracking. TIG welding is considered as an economical way to refurbish the minor damage component as replacement with new one is costly due to high material cost and complexity in manufacturing processes. Unfortunately, heat from welding that applies to the component may create new cracks during and after process from liquation and strain-age cracking. This phenomena is problem especially in precipitation-hardened …
Effect Of Ni On The Formability And Texture Of Hot Rolled Weathering Steel, Gadadhar Sahoo, I. S. Wani, S. B. Kumar, Balbir Singh, Atul Saxena, R. Basu
Effect Of Ni On The Formability And Texture Of Hot Rolled Weathering Steel, Gadadhar Sahoo, I. S. Wani, S. B. Kumar, Balbir Singh, Atul Saxena, R. Basu
Journal of Metals, Materials and Minerals
Formability behavior in two grades of hot rolled low carbon weathering steel with varying nickel content i.e., SCR 1 (Fe-0.116P-0.018Ni) and SCR 2 (Fe-0.115P-0.34Ni), have been evaluated in relationship to microstructure, EBSD estimated orientation distribution function (ODF), special boundary nature, mechanical properties and formability parameters like tensile stain hardening exponent (n) and plastic anisotropy ratio (r). The alloy sample SCR 1 exhibited improved formability characteristics in terms of stain hardening exponent (n) and plastic anisotropy ratio (r). This was mainly attributed to relatively higher fraction of the ND//<111> orientation or the ? fibre texture component and increased presence of sigma …
Microstructure Based Finite Element Simulation Of Jco Forming Process For Pipeline X65, Wut Thianngoen, Saranya Kingklang, Vitoon Uthaisangsuk
Microstructure Based Finite Element Simulation Of Jco Forming Process For Pipeline X65, Wut Thianngoen, Saranya Kingklang, Vitoon Uthaisangsuk
Journal of Metals, Materials and Minerals
In recent years, strong increases in energy demand have become the most important issue in every section. High strength pipeline steels make large contribution to cost reduction for fuel transportation in oil and gas industries due to their great combination of optimal strength and toughness properties. Mechanical properties of pipeline steel tubes are significantly influenced by their microstructure characteristics, which in turn are controlled by the production. In this work, the JCO forming process of gas pipeline tube made of hotrolled steel grade X65 with ferrite/pearlite microstructure was investigated by means of a FE multiscale modeling approach. Three different scales …
Mechanical Properties Of Interpenetrating Phase Composites Using Open-Cell Al Foams With Natural Rubber And Polyethylene, Kunmutta Angamnuaysiri, Seksak Asavavisithchai
Mechanical Properties Of Interpenetrating Phase Composites Using Open-Cell Al Foams With Natural Rubber And Polyethylene, Kunmutta Angamnuaysiri, Seksak Asavavisithchai
Journal of Metals, Materials and Minerals
Interpenetrating phase composites (IPCs) were produced by conventional casting process, in vacuum atmosphere, using open-cell Al foams as matrix, and filled with either natural rubber or polyethylene. Mechanical properties of IPCs strongly depends on types of polymeric phases. It is found that the IPCs with polyethylene show an increase in compressive strength as well as failure strain. However, a large decrease of compressive strength is observed in the IPCs with natural rubber, as a result of cracks along the interface between Al foam and the rubber. These cracks are distributed throughout foam structure in the IPCs.
Microstructure And X-Ray Diffraction Analysis Of Al-Cu Couples Diffused At High Temperature, Jaime Hinojosa-Torres, Juan Manuelaceves-Hernández, Andres Herrera-Vázquez, Victor Manuelcastaño-Meneses
Microstructure And X-Ray Diffraction Analysis Of Al-Cu Couples Diffused At High Temperature, Jaime Hinojosa-Torres, Juan Manuelaceves-Hernández, Andres Herrera-Vázquez, Victor Manuelcastaño-Meneses
Journal of Metals, Materials and Minerals
By employing a thermal field of 813 K, couples of Al with Cu were welded as consequence of the atomic diffusion. The periods of permanency inside the field were 200, 320 and 480 hours. After the periods of test, SEM observations show the formation of two contiguous plate likes (~15 to 30 micrometres, width) that they are in normal position to the concentration gradient. By utilizing elemental analyses and X-ray diffraction techniques one plate like was identified as the h2 phase (CuAl) and the other one as the q phase (CuAl2) of the aluminium-copper system. Immediate to the q plate …
Extraction And Characterization Of Cellulose Nanocrystals Produced By Acid Hydrolysis From Corn Husk, Piyaporn Kampeerapappun
Extraction And Characterization Of Cellulose Nanocrystals Produced By Acid Hydrolysis From Corn Husk, Piyaporn Kampeerapappun
Journal of Metals, Materials and Minerals
Corn husk is one of the agricultural residues represent abundant, inexpensive, and readily available source of renewable lignocellulosic biomass. Cellulose nanocrystals (CNCs) were extracted from corn husk by alkali and bleaching treatments followed by sulfuric acid hydrolysis treatment. The material obtained after each stage of the treatments was characterized. Morphological investigation was carried out using scanning electron microscope (SEM) and transmission electron microscopy (TEM). Fourier transform infrared (FTIR) spectroscopy showed the progressive removal of non-cellulosic materials. The crystallinity of corn husk and CNCs was also investigated using X-ray diffraction analysis (XRD). The highest crystallinity index value of this study is …
Effect Of Temperature Dropping During Solution Treatment During Rejuvenation Heat Treatment On Final Microstructures In Cast Nickel Base Superalloy, Grade Inconel-738, Aimamorn Promboopha, Sureerat Polsilapa, Panyawat Wangyao
Effect Of Temperature Dropping During Solution Treatment During Rejuvenation Heat Treatment On Final Microstructures In Cast Nickel Base Superalloy, Grade Inconel-738, Aimamorn Promboopha, Sureerat Polsilapa, Panyawat Wangyao
Journal of Metals, Materials and Minerals
Generally, the rejuvenation heat treatment of degraded turbine blades, which were made of cast nickel based superalloy, Grade Inconel 738, usually consist of solution treatment condition with temperature range of 1125C- 1205C for 3 hours and then following with double aging processes, which include primary aging at 1055C for 1 hour and secondary aging at 845C for 24 hours. However, in practical working conditions of reheat treatment processed, the possible change of temperature during solution treatment can be obtained by error or malfunction of heating furnace, which usually provides the temperature dropping down. To simulate this effect, the dropping temperature …
Preparation And Characterization Of Epoxidized Natural Rubber And Epoxidized Natural Rubber/Carboxylated Styrene Butadiene Rubber Blends, Saowaroj Chuayjuljit, Thongchai Nutchapong, Onusa Saravari, Anyaporn Boonmahitthisud
Preparation And Characterization Of Epoxidized Natural Rubber And Epoxidized Natural Rubber/Carboxylated Styrene Butadiene Rubber Blends, Saowaroj Chuayjuljit, Thongchai Nutchapong, Onusa Saravari, Anyaporn Boonmahitthisud
Journal of Metals, Materials and Minerals
In this study, epoxidized natural rubber (ENR) with 30 mol % epoxidation (ENR-30) was first prepared from natural rubber (NR) latex via in situ performic epoxidation using 0.5 M hydrogen peroxide and 0.75 M formic acid at 50C for 4 h. The prepared ENR-30 was blended with three different loadings of carboxylated styrene butadiene rubber (XSBR) (10, 20 and 30 wt%) in the latex stage. All ENR-30/XSBR blends had longer scorch time and cure time than neat ENR-30 as examined on a moving die rheometer. The tensile properties (tensile strength, modulus at 300% strain and elongation at break), thermal stability …
Sandwich-Type Cobalt Tungstophosphate: Synthesis, Characterization And Catalytic Activity, Wimonrat Trakarnpruk, Aphiwat Wannatem, Jutatip Kongpeth
Sandwich-Type Cobalt Tungstophosphate: Synthesis, Characterization And Catalytic Activity, Wimonrat Trakarnpruk, Aphiwat Wannatem, Jutatip Kongpeth
Journal of Metals, Materials and Minerals
odium tungstophosphate, Na9[HPW9O34].7H2O was synthesized by reaction in aqueous solution of sodium tungstate, phosphoric acid and acetic acid. It was used as a precursor for synthesis of sandwich-type cobalt tungstophosphate, K10[Co4(H2O)2(PW9O34)2].20H2O by reacting with cobalt chloride and potassium acetate. The potassium ion can be exchanged with tetrabutylammonium bromide. The characterization was carried out by means of elemental analysis, FT-IR, UV-vis diffuse reflectance spectroscopy (DR-UV-vis). The sandwich-type cobalt tungstophosphate was used to catalyze oxidation of cyclooctane with H2O2 as oxidant in absence and presence of phase transfer agent. The experimental results showed that with phase transfer agent, the sandwich-type cobalt tungstophosphate …
Peroxidase Inhibition Assay For The Detection Of Some Thiols By Carbon Screen Printed Electrodes Based On Square Wave Voltammetry, Wischada Jongmevasna, Orawon Chailapakul, Manchumas Hengsakul Prousoontorn
Peroxidase Inhibition Assay For The Detection Of Some Thiols By Carbon Screen Printed Electrodes Based On Square Wave Voltammetry, Wischada Jongmevasna, Orawon Chailapakul, Manchumas Hengsakul Prousoontorn
Journal of Metals, Materials and Minerals
Cassava peroxidase (CSP) from leaves of cultivar KU50 was used as an alternative peroxidase for the electrochemical detection of thiram and thiourea.Square-wave voltammetry (SWV) incorporated with screen-printed carbon electrode was applied for the investigation of peroxidase activity. It was based on the measurement of 3, 3-diaminobenzidine (DAB) electro active product catalyzed by CSP and horseradish peroxidase (HRP) in 0.04 M Britton-Robinson buffer, pH 6, containing urea hydrogen peroxide in 96-well microplate. The reaction mixture in the presence of either thiourea or thiram was performed in order to study their effects on DAB oxidation catalyzed by both peroxidases. From the result …
Properties Of Binary And Ternary Composites Of Polypropylene Containing Soybean Oil-G-Chitosan And Hydrophobic Phosphonated Silica, Natthaphop Suwannamek, Kawee Srikulkit
Properties Of Binary And Ternary Composites Of Polypropylene Containing Soybean Oil-G-Chitosan And Hydrophobic Phosphonated Silica, Natthaphop Suwannamek, Kawee Srikulkit
Journal of Metals, Materials and Minerals
PP/soybean oil-g-chitosan binary composite, PP/hydrophobic phosphonated silica binary composite, and PP/chitosan/hydrophobic phosphonated silica ternary composite were prepared. Firstly, the preparation of soybean oil-g-chitosan was carried out by surface hydrophobicity modification of chitosan powder with soybean oil maleate and hydrophobicallyphosphonated silica was prepared by silanization of phosphonated silica with hexadecyltrimethoxysilane (an organosilane). Binary and ternary composites were prepared using a twin screw extruder. It was found that soybean oil-g-chitosan not only caused a decrease in tensile strength but also enhanced flexibility of PP due to its plasticization effect. In the opposite direction, the addition of hydrophobic phosphonated silica resulted in an …
Effect Of Heating Rate On Morphology Of Anti-Reflective Tio2 Film Coated By Sol-Gel With Polyethylene Glycol, Kumpol Leelaruedee, Patama Visuttipitukul, Niti Yongvanich
Effect Of Heating Rate On Morphology Of Anti-Reflective Tio2 Film Coated By Sol-Gel With Polyethylene Glycol, Kumpol Leelaruedee, Patama Visuttipitukul, Niti Yongvanich
Journal of Metals, Materials and Minerals
This research studies formation of thin porous TiO2 film prepared by Sol-gel process with spin coating. Polyethylene glycol with molecular weight of 6,000 g/mol (6kPEG) was used as a pore generating agent. The TiO2 film was calcination at 450C for 1 hour with different heating rate. It was found that heating rate strongly affects on morphology of TiO2 film due to grain coalescence. The lower heating rate tends to cause more coalescence resulting in coarsening of both grain and pore size. With higher heating rate, film density can be increased due to lower number of pores. On the other hand, …
An Updated Mineralogical Analysis Of Sediment Materials From Three Therapeutically-Used Peruvian Lagoons, Maria Luisa Ceron Loayza, Jorge Aurelio Bravo Cabrejos, F. A. R. Navarro, F. Urcia Ch.
An Updated Mineralogical Analysis Of Sediment Materials From Three Therapeutically-Used Peruvian Lagoons, Maria Luisa Ceron Loayza, Jorge Aurelio Bravo Cabrejos, F. A. R. Navarro, F. Urcia Ch.
Journal of Metals, Materials and Minerals
Herein, we determine the elemental, structural and mineralogical characterization of samples collected in three Peruvian lagoons; likewise, we investigate the physical and chemical properties of their fractions, both clay and magnetic. These lagoons are located in the Chilca District, Cate Province, southern Lima Region, Peru; their morphology has been altered since we carried out a previous study five years ago. The physical analytical techniques we used were energy dispersive X-ray fluorescence (EDXRF); X-ray diffractometry (XRD); and transmission Msbauer spectroscopy (TMS), at room and liquid-helium temperatures, and at low and high velocities. The results indicate that dolomite is the main clayey …
Microstructural Development Of Galvanized Steels Prepared With Ni-P Electroless Deposited Pre-Coatings, Chulaluk Somphotch, Suparoek Henpraserttae, Ekasit Nisarattanaporn, Yuttanant Boonyongmaneerat
Microstructural Development Of Galvanized Steels Prepared With Ni-P Electroless Deposited Pre-Coatings, Chulaluk Somphotch, Suparoek Henpraserttae, Ekasit Nisarattanaporn, Yuttanant Boonyongmaneerat
Journal of Metals, Materials and Minerals
An electroless pre-coating process is investigated as a possible method to prevent the sandelin effect, whereby steels containing silicon reacts rapidly with zinc during galvanization. From the microstructural and kinetics analysis, it is found that nickel-phosphorus electroless pre-coatings effectively serve as barriers to the reaction between Fe and Zn during galvanization, regardless of the silicon content in the steel substrates. Correspondingly, the coating thickness of the galvanized steels can be well-controlled.
Influence Of Hot-Dip Coatings On Mechanical And Corrosion Behaviors Of Steel Bolts, Thanit Kenhong, Gobboon Lothongkum, Yuttanant Boonyongmaneerat
Influence Of Hot-Dip Coatings On Mechanical And Corrosion Behaviors Of Steel Bolts, Thanit Kenhong, Gobboon Lothongkum, Yuttanant Boonyongmaneerat
Journal of Metals, Materials and Minerals
Steel is the main type of materials used in construction applications. Steel bolt, in particular, is used for fastening all the structural components together, and hence high durability in terms of the mechanical and corrosion resistance is inevitably critical. Carbon steel shows adequate mechanical strength, yet it is highly susceptible to corrosion. On the other hand, stainless steel is praised for its remarkable corrosion resistance, yet its relatively low yield stress exhibits a drawback. Hot-dip coating which provides Fe-Zn or Zn-Ni compounds in the coating interface could potentially mitigate the shortcomings of carbon steel and stainless steel by providing improved …
Effect Of Surfactant On Conductivity Of Poly(Pyrrole-Co-Formyl Pyrrole) Via Emulsion Polymerization, Sirilak Arunsawad, Kawee Srikulkit, Sarintorn Limpanart
Effect Of Surfactant On Conductivity Of Poly(Pyrrole-Co-Formyl Pyrrole) Via Emulsion Polymerization, Sirilak Arunsawad, Kawee Srikulkit, Sarintorn Limpanart
Journal of Metals, Materials and Minerals
P(Py-co-FPy) were synthesized via emulsion polymerization, SDS and PSS used as surfactant and TFA as catalyst. Amounts of surfactant were vary as mole ratio of surfactant : monomer (0.25, 0.5 and 1.0). The synthesis copolymers were characterized by FTIR, SEM, particle size analyzer and four point probes. As a result of FT-IR spectra proved that the synthesized copolymers are associated with the structure of the P(Py-co-FPy). Spherical particles were detected by SEM and particles diameter is in range of 60-600 nm depending on type and amounts of surfactant. The electrical conductivity is in the range of 1.74x 10-5 to 2.21 …
Mechanical Properties Of Poly(Lactic Acid) Composites Reinforced With Microfibrillated Cellulose Prepared Using High Speed Blending, Supachok Tanpichai, Jatuphorn Wootthikanokkhan
Mechanical Properties Of Poly(Lactic Acid) Composites Reinforced With Microfibrillated Cellulose Prepared Using High Speed Blending, Supachok Tanpichai, Jatuphorn Wootthikanokkhan
Journal of Metals, Materials and Minerals
Bamboo fibers, as a raw cellulose source, were used to prepare microfibrillated cellulose (MFC) using a high speed blender at 20,000 rpm for 60 min. Nanofibers with the width of less than 100 nm were disintegrated from the fibers. MFC networks were then prepared, and embedded in poly(lactic acid) resin using a compression molding at temperature of 180 C and a pressure of 10 MPa. Mechanical properties of poly(lactic acid) composites reinforced with MFC were investigated. The interaction between MFC fibrils and PLA resin was observed. As a result, Youngs modulus and tensile strength of the composites increased to 3.1 …
Structural Characterization Of Iron Oxides And Hydroxides In The Clay Fraction Of Soil From The Inca Civilization Moray Terraces, Maria Luisa Ceron Loayza, Jorge Aurelio Bravo Cabrejos, Felipe Americo Reyes Navarro, Rosio Ascuna Arcondo
Structural Characterization Of Iron Oxides And Hydroxides In The Clay Fraction Of Soil From The Inca Civilization Moray Terraces, Maria Luisa Ceron Loayza, Jorge Aurelio Bravo Cabrejos, Felipe Americo Reyes Navarro, Rosio Ascuna Arcondo
Journal of Metals, Materials and Minerals
We introduce the structural characterization of the iron oxides and hydroxides in the clay fraction from soil collected in Moray terraces, Peru. It is important since these terraces are considered as a major technological advancement in agriculture in Inca Civilization times. We utilized the following: techniques of selective dissolution by dithionite-citrate-bicarbonate (DCB) and sodium hydroxide (NaOH); analytical techniques of X-ray diffractometry (XRD); and transmission Msbauer spectroscopy (TMS). XRD of the untreated samples showed that all the terraces contain quartz and calcite. After a treatment with NaOH and DCB, the peaks from quartz kept defined; XRD analysis shows a well-crystallized Fe3+ …
Corrosion Behaviour Of High Phosphorus Containing Cu-Cr Weather Resistant Steel, Gadadhar Sahoo, Anjana Deva, Balbir Singh, Atul Sexena
Corrosion Behaviour Of High Phosphorus Containing Cu-Cr Weather Resistant Steel, Gadadhar Sahoo, Anjana Deva, Balbir Singh, Atul Sexena
Journal of Metals, Materials and Minerals
Three steels viz., G22(Fe-0.072C-0.028 Si-0.20Mn-0.19P-0.38Cr-0.24Cu-0.17Ni), G32(Fe-0.072C-0.061 Si-0.23 Mn-0.19P-0.64Cr-0.14Cu) and SCOR (Fe-0.09C-0.37Si-0.42Mn-0.15P-0.37Cr-0.35Cu-0.31Ni) were made through ingot metallurgy route and hot rolled to 3 mm thick sheets. For other steels, similar corrosion rates were observed from the Tafel extrapolation study of freshly ground samples in 3.5% NaCl solution. Other technique employed to evaluate the effect of phosphorus on the formation of protective rust layer was electrochemical impedance spectroscopy (EIS) test after exposing the samples in an atmospheric exposure rack for four months on the roof top of a fourth floored building. Results revealed that the polarization resistance or rust resistance of G22 …
Effects Of Poly(Butylene Succinate) And Calcium Carbonate On The Physical Properties Of Plasticized Poly(Vinyl Chloride), Saowaroj Chuayjuljit, Phasawat Chaiwutthinan, Sitthipong Samutthong, Onusa Saravari, Anyaporn Boonmahitthisud
Effects Of Poly(Butylene Succinate) And Calcium Carbonate On The Physical Properties Of Plasticized Poly(Vinyl Chloride), Saowaroj Chuayjuljit, Phasawat Chaiwutthinan, Sitthipong Samutthong, Onusa Saravari, Anyaporn Boonmahitthisud
Journal of Metals, Materials and Minerals
In this studypoly(butylene succinate) (PBS) , a polymeric plasticizer, was partially replaced a conventional plasticizer, diisononyl phthalate (DINP) to avoid the plasticizer loss from poly(vinyl chloride) (PVC) overtime for various service conditions and to obtain a long-term plasticizer retention in the flexible PVC products. The plasticized PVC samples were prepared by melt mixing on a two roll mill, followed by compression molding. The mechanical properties (tensile properties, tear strength and hardness), thermal stability and morphology of the 20/20 phr (parts by weight per hundred parts of resin) DINP/PBS-plasticized PVC were evaluated and compared with those of the 40 phr DINP-plasticized …
Synthesis Of Porous Silica By Co-Micelle Emulsion Ternplating Technique Using Peg/Acrylamide And 2-(Acryloyloxy)-N,N,N-Trimethylethanaminium Chloride/Acrylamide As Templates, Iman Abdullah, Widyastuti Samadi, Arvinda Widyana, David Chandra Pandapotan, Ridla Bakri
Synthesis Of Porous Silica By Co-Micelle Emulsion Ternplating Technique Using Peg/Acrylamide And 2-(Acryloyloxy)-N,N,N-Trimethylethanaminium Chloride/Acrylamide As Templates, Iman Abdullah, Widyastuti Samadi, Arvinda Widyana, David Chandra Pandapotan, Ridla Bakri
Journal of Metals, Materials and Minerals
Co-micelle emulsion templating (co-MET) technique is a new method to synthesize uniform and ordered porous silica from tetraethylortosilicate precursor using double polymer as templates. In this study, co-MET technique was conducted by varying template type (namely PEG/acrylamide and 2(acryloyloxy)N,N,Ntrimethylethanaminium chloride/acrylamide) and percentage of polymer (2.5%, 5%, 10%, 15% and 20% for PEG and 0.5%, 1%, 2.5%, 5%, 10% for 2(acryloyloxy)N,N,Ntrimethylethanaminium chloride). The resulting porous silica were then characterized by SEM-EDS, BET and XRD to investigates the pore character and structure of silica. Based on SEM-EDS and BET analysis, it is shown that the amount and the type of polymer gave …
Effect Of Styrene-Methyl Methacrylate/Styrene-Butadiene Rubber On Properties Of Poly(Vinyl Chloride), Buranin Saengiet, Fuangfa Unob, Kawee Srikulkit
Effect Of Styrene-Methyl Methacrylate/Styrene-Butadiene Rubber On Properties Of Poly(Vinyl Chloride), Buranin Saengiet, Fuangfa Unob, Kawee Srikulkit
Journal of Metals, Materials and Minerals
Generally, poly(vinyl chloride) (PVC) without the addition of plasticizer or impact modifiers is rigid and brittle. The aim of this research was to improve the mechanical properties of PVC using styrene-methyl methacrylate/styrene-butadiene compound (SMMA/SBR rubber) as an impact modifier. The compound was obtained commercially. PVC containing SMMA/SBR rubber having SMMA/SBR phrs of 2.5, 5, 7.5 and 10 were prepared using two-roll mill set the conditions as follows: 170 oC and 5 min. Then, compression molding was carried out to prepare testing samples. FTIR analysis of SMMA/SBR rubber containing PVC samples showed the absorption band at 1732 cm-1 (C=O stretching), 3025 …
Preparation And Characterizations Of Highly Filled Graphene-Polybenzoxazine Composites, R Plengudomkit, M Okhawilai, S Rimdusit
Preparation And Characterizations Of Highly Filled Graphene-Polybenzoxazine Composites, R Plengudomkit, M Okhawilai, S Rimdusit
Journal of Metals, Materials and Minerals
In recent years, graphene has been extensively utilized in electronic applications due to its superior electrical conductivity, high thermal conductivity and excellent mechanical properties [1, 2]. This research emphasized on the development of graphene (xGnP Grade H, XG Science, USA) filled composites based on polybenzoxazine particularly at high graphene loading (0-60wt%) [3, 4]. It was found that the density of the obtained composites was linearly increased with graphene content and the values were determined to be 1.185-1.637 g/cm3 which followed the rule of mixture suggesting negligible void in the composites samples. Mechanical and thermal properties of the graphene filled polybenzoxazine …
Effects Of The Tempering On Mechanical Properties Of Dual Phase Steels, T Sirinakorn, V Uthaisangsuk, S Srimanosaowapak
Effects Of The Tempering On Mechanical Properties Of Dual Phase Steels, T Sirinakorn, V Uthaisangsuk, S Srimanosaowapak
Journal of Metals, Materials and Minerals
Dual Phase (DP) steels have been gradually used in the automotive industries because of their distinguished strength and ductility properties. Principally, microstructure of the DP steels contains defined amount of hard martensite islands dispersed in soft ferrite matrix. This microstructure characteristic and corresponding mechanical properties of the DP steels can be adjusted by heat treatment. In this work, effects of tempering temperature and time on tensile properties of DP steels were investigated. Continuous yielding behavior of tempered DP steels was observed up to around a temperature of 300C. At higher tempering temperature, DP steels showed distinct increased yield point. Furthermore, …
Synthesis And Characterization Of Amorphous Silica Nanoparitcles From Aqueous Silicates Uisng Cationic Surfactants, M Abou Rida, F Harb
Synthesis And Characterization Of Amorphous Silica Nanoparitcles From Aqueous Silicates Uisng Cationic Surfactants, M Abou Rida, F Harb
Journal of Metals, Materials and Minerals
In this work amorphous silica was synthesized using sodium silicate and hydrochloric acid by precipitation according to St?ber method. A system of chemical reactions has been developed which permits the controlled growth of silica particles using two different cationic surfactants as the dispersing agents. These surfactants were cetyltrimethylammonium bromide [CTAB] and dodecyltrimethylammonium bromide [DTAB]. The synthesized silicas were characterized by using X-ray diffraction (XRD), Infrared Spectroscopy (IR), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDX) and Dynamic light scattering (DLS). Addition of a dispersing agent in the reaction reduced the particle size of the silica produced. The average size of …