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Articles 1 - 28 of 28
Full-Text Articles in Engineering
Chitosan/Calcium Phosphate Composites Scaffolds Prepared By Membrane Diffusion Process, P Thanaphat, P Thunyakitpisal, W Techaboonyakiat
Chitosan/Calcium Phosphate Composites Scaffolds Prepared By Membrane Diffusion Process, P Thanaphat, P Thunyakitpisal, W Techaboonyakiat
Journal of Metals, Materials and Minerals
Hydroxyapatite (Ca10(PO4)6(OH)2, HAp) and Dicalcium phosphate dihydrate (CaHPO4.H2O, DCPD) were homogeneously hybridized into chitosan solution by membrane diffusion process. The threedimensional scaffolds were obtained by freeze-drying process. The organic and inorganic contents of scaffold were determined by using thermogravimetry analysis (TGA). The surface morphology of the scaffold and characteristic of calcium phosphate were investigated by scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDX), and X-ray diffraction (XRD), respectively. Compressive modulus was also determined by dynamic mechanical analysis (DMA). The hybridized inorganic content ranges from 35-45%. Both chitosan/HAp and chitosan/DCPD scaffolds showed interconnected porous structure. The calcium to phosphorus ratios …
Water Soluble Chitosan As An Environment-Friendly Coagulant In Removal Of Rubber Particles From Skim Rubber Latex, R Werathirachot, P Danwanichakul, C Kongkaew, S Loykulnant
Water Soluble Chitosan As An Environment-Friendly Coagulant In Removal Of Rubber Particles From Skim Rubber Latex, R Werathirachot, P Danwanichakul, C Kongkaew, S Loykulnant
Journal of Metals, Materials and Minerals
Water soluble chitosan, dissolved in hot deionized water to obtain 0.8% solution, was used for the coagulation-flocculation of skim natural rubber latex. The efficiency of coagulation-flocculation of skim rubber latex without pH adjustment was much poorer than that of neutral skim rubber latex. When adding chitosan solution to the neutral skim rubber latex with a rubber content of 5.300 %wt/vol until the concentration of chitosan in the dispersion was 0.107%, the phase separation between rubber particles and yellow serum was clearly observed. At this condition, the removal efficiency of skim rubber particles was found to be the best among all …
Preparation And Characterization Of Particles From Chitosan With Different Molecular Weights And Their Trimethyl Chitosan Derivatives For Nasal Immunization, W Boonyo, H E. Junginger, N Waranuch, A Polnok, T Pitaksuteepong
Preparation And Characterization Of Particles From Chitosan With Different Molecular Weights And Their Trimethyl Chitosan Derivatives For Nasal Immunization, W Boonyo, H E. Junginger, N Waranuch, A Polnok, T Pitaksuteepong
Journal of Metals, Materials and Minerals
According to previous studies, molecular weights (MW) of chitosan presented an influence on the level of immune response to model antigen when administering with chitosan through nasal route. Moreover, trimethyl chitosan (TMC) with a degree of quaternization (DQ) of 40%, chitosan derivatives, was also shown to be the most potent nasal OVA delivery platforms compared to TMC with DQ of 20% and 60% in mice model. The aims of this study were to prepare particles from chitosan with difference MW and their TMC derivatives (DQ = 40%) and to characterize size, zeta potential, loading efficiency and release profile in order …
Preparation Of Ultrafine Silver Powder Using Glycerol As Reducing Agent, E Nisaratanaporn, K Wongsuwan
Preparation Of Ultrafine Silver Powder Using Glycerol As Reducing Agent, E Nisaratanaporn, K Wongsuwan
Journal of Metals, Materials and Minerals
The production of silver nanoparticles and sub-micron particles can be achieved by silver alkoxide from silver sulfate and subsequently reducing with glycerol. To reduce the particle size of silver sulfate precursors, ball milling was employed to reduce particle sizes down to 0.81 microns. However, silver sulfate without grinding provided smaller particle sizes of silver particles as opposed to ground specimens. Stirring silver alkoxide simultaneously was efficient to provide for uniform distribution of silver powder. The silver powder thus produced had brain-like shape consisted of very fine aggregate silver particles. The yield of silver powder was in the range of 95-99 …
Influence Of Reinforced Plastomers On Injection Moulds Wear, A Guzanová, J Brezinová
Influence Of Reinforced Plastomers On Injection Moulds Wear, A Guzanová, J Brezinová
Journal of Metals, Materials and Minerals
The contribution deals with wear of injection moulds based on aluminium alloy Alumec 89 in friction couples with plastomers reinforced with different glass fibres content. Friction relations in injection moulding were simulated by adhesion dry wear test with help of Amsler equipment with area contact of friction couple. Wear intensity was evaluated by friction coefficient and relative wear by weight loss. Simultaneously, changes of aluminium alloy surface morphology after wear in particular friction couples were analysed.
Demonstration Of The Ntc Ceramic Application For Temperature Measurement And Control Using The Labview-Based Measurement System, T Panmatarith, K Poatong
Demonstration Of The Ntc Ceramic Application For Temperature Measurement And Control Using The Labview-Based Measurement System, T Panmatarith, K Poatong
Journal of Metals, Materials and Minerals
In the present paper, ZnO+0.01SnO2 ceramics were prepared using a standard ceramic method. We present the NTC ceramic application for temperature measurement and control using the LabVIEW-based measurement system. The measured resistance of the sample at room temperature was about 6.5 kΩ. The electrical resistance versus temperature of the sample was measured. The negative temperature coefficient of resistance of the sample was -1.018 %/°C. This sample showed NTC effect and exhibited NTC resistor, indicating their potential application as temperature sensor with low cost. It can be used as temperature sensor by using the NTC effect . The measured temperature (T) …
Production Of Sponge Rubber For Monolayer Rubber Stamp Using Salt Leaching Method, W Trakanpruk, Y Rodthong
Production Of Sponge Rubber For Monolayer Rubber Stamp Using Salt Leaching Method, W Trakanpruk, Y Rodthong
Journal of Metals, Materials and Minerals
Sponge rubber used for monolayer rubber stamp was produced from nitrile butadiene rubber (NBR). Open cells in sponge rubber were created using salt leaching method. Effect of size and amount of sodium chloride which was used as a water soluble salt on the creation of open cells in the rubber was investigated. Carbon black was used as a filler. A different type of surfactant was added to increase the leaching out of salt from the rubber. Cure characteristics of the compound rubbers: maximum torque, minimum torque, scorch time and cure time as well as hardness of the prepared sponge rubber …
Properties Evaluation Of Sodium Nitrite Treated Chitosan-Cotton Fabric, S Srisuk, K Srikulkit
Properties Evaluation Of Sodium Nitrite Treated Chitosan-Cotton Fabric, S Srisuk, K Srikulkit
Journal of Metals, Materials and Minerals
In this study, chitosan coated-cotton fabric was prepared and then treated with sodium nitrite under mild condition, aiming at the partial removal of surface-chitosan in order to solve the problems of surface dyeing and fabric stiffness. The results showed that sodium nitrite treated chitosan-fabric exhibited an improvement of dyeability (higher dye exhaustion and color strength) when compared to untreated fabric. The improvement in dyeability was due to the availability of chitosan amino groups which had an affinity to anionic dyes including reactive dyes. Other fabric properties were evaluated. The results showed that color fastness properties (crocking fastness and light fastness) …
Application Of Chitosan In Rice Production, S Boonlertnirun, C Boonraung, R Suvanasara
Application Of Chitosan In Rice Production, S Boonlertnirun, C Boonraung, R Suvanasara
Journal of Metals, Materials and Minerals
Chitosan is a natural biopolymer which stimulates growth and increases yield of plants as well as induces the immune system of plants. The objectives of this study were to determine appropriate applications for increasing of the rice yield. The experiment was performed with randomized complete block design ( RCBD) with four replications. Four treatments were done as follows : no chitosan application, seed soaking with chitosan solution, seed soaking and soil application with chitosan solution and seed soaking and foliar spraying with chitosan solution. The results showed that application of chitosan by seed soaking and soil application four times throughout …
Preparation Of N-Acetyl-D-Glucosamine Using Enzyme From Aspergillus Sp., P Setthakaset, R Pichyangkura, A Ajavakom, M Sukwattanasinitt
Preparation Of N-Acetyl-D-Glucosamine Using Enzyme From Aspergillus Sp., P Setthakaset, R Pichyangkura, A Ajavakom, M Sukwattanasinitt
Journal of Metals, Materials and Minerals
N-acetyl-D-glucosamine (GlcNAc) is one of the basic constituents of mammal cartilage, which is known to help repair deteriorating cartilage and relieve pain and inflammation in osteoarthritis patients. The preparation of GlcNAc from squid pen β-chitin by using Aspergillus sp. chitinase in enzymatic hydrolysis is studied. The cultivation of the fungus in colloidal chitin minimum media at pH 3.5 and 40°C for 5 days gives the highest chitinolytic activity of 3.1 U/mL. The crude enzyme obtained from the the cultivation is used in the hydrolysis of milled squid pen β-chitin (50μm) at pH 4 (acetic acid 2M) and 45°C using 22 …
Chitin Nanowhisker And Chitosan Nanoparticles In Protein Immobilization For Biosensor Applications, P Na Nakorn
Chitin Nanowhisker And Chitosan Nanoparticles In Protein Immobilization For Biosensor Applications, P Na Nakorn
Journal of Metals, Materials and Minerals
In this study, bovine serum albumin (BSA) was used as a model protein for the optimization of protein immobilization on chitin nanowhisker and chitosan nanoparticles under different conditions. Chitosan nanoparticles showed better results than chitin in this immobilization purpose. The immobilization at 15 minutes, pH 6 and 20-25°C was the optimal condition. Subsequently, glucose oxidase (GOD), enzyme used for glucose determination, was applied in order to investigate the optimum immobilization condition on chitosan nanoparticles. The optimal condition prove to…at pH 7, 30°C and 0.5 mg/ml of initial GOD concentration via immobilization at 15 minutes. Chitin nanowhisker and chitosan nanoparticles in …
Factors Affecting Preparations Of Chitosan Microcapsules For Colonic Drug Delivery, K Huanbutta, M Luangtana-Anan, P Sriamornsak, S Limmatvapirat, S Puttipipatkhachorn, J Nunthanid
Factors Affecting Preparations Of Chitosan Microcapsules For Colonic Drug Delivery, K Huanbutta, M Luangtana-Anan, P Sriamornsak, S Limmatvapirat, S Puttipipatkhachorn, J Nunthanid
Journal of Metals, Materials and Minerals
This work aimed at studying factors affecting preparations of chitosan microcapsules for colonic drug delivery. Chitosan microcores (CS, 45kDa, 87% degree of deacetylation) containing diclofenac sodium (DS) coated with Eudragit®S100 (ED) were prepared by a desolvation technique. Sodium sulfate was used as a desolvating agent and the drying process was freeze-drying. Factors affecting morphology, particle size and zeta potential of microcapsules were evaluated, i.e. weight ratio of DS:CS:ED, surfactant (polysorbate 80), anti-adherent (silicon dioxide), and the use of sonication or homogenization in preparation processes. The weight ratio of DS:CS:ED at 1:2:6 provided the smallest microcapsules of about 82.37±1.61 micrometer in …
Fabrication Of Al/Al2o3 Composite By Powder Metallurgy Method From Aluminum And Rice Husk Ash, C Dhadsanadhep, T Luangvaranunt, J Umeda, K Kondoh
Fabrication Of Al/Al2o3 Composite By Powder Metallurgy Method From Aluminum And Rice Husk Ash, C Dhadsanadhep, T Luangvaranunt, J Umeda, K Kondoh
Journal of Metals, Materials and Minerals
Fabrication of Al-4wt.%Cu /Alumina composite was reported. The method of fabrication was powder metallurgy by in-situ reaction to form alumina during fabrication. Starting materials were mixture of aluminum, copper, and silica powders. Silica is in form of rice husk ash. The mixture was cold compacted, and sintered at 650°C for 1 h. Hot forging was carried out to further consolidate the sintered billet, followed by 10-h heat treatment at temperatures between 590 to 650°C. Phase analysis by XRD confirmed that in-situ reaction between silica and aluminum powders occurred during heat treatment at temperatures above 590°C. The products of reaction were …
Fabrication Of Porous Bioactive Glass-Ceramics Via Decomposition Of Natural Fibres, P Sooksaen, S Suttiruengwong, K Oniem, K Ngamlamiad, J Atireklapwarodom
Fabrication Of Porous Bioactive Glass-Ceramics Via Decomposition Of Natural Fibres, P Sooksaen, S Suttiruengwong, K Oniem, K Ngamlamiad, J Atireklapwarodom
Journal of Metals, Materials and Minerals
Porous bio glass-ceramics were prepared via natural fibres burning-out process. Glass-ceramics were fabricated by controlled crystallization of suitable glass compositions to give required crystalline phase/s. Porous structure was formed alongside during burning-out of natural fibres. Three glass batches were prepared in the SiO2-CaO-P2O5-K2O-Na2O-CaF2 glass system, then melted, quenched and milled to give fine glass powders. DTA thermograms for the three glass compositions showed crystallization temperatures between 720 and 760°C and Tg ranging between 508 and 645°C. Porous glass-ceramics were characterized for bulk density, phase evolution and microstructures. Different compositions resulted in different bulk densities and phases that crystallized out. Fluorapatite …
Current Status Of Nanotechnology Consumer Products And Nano-Safety Issues, N Chuankrerkkul, S Sangsuk
Current Status Of Nanotechnology Consumer Products And Nano-Safety Issues, N Chuankrerkkul, S Sangsuk
Journal of Metals, Materials and Minerals
This paper is divided into 2 parts to present a review on nanotechnology consumer products ('Nanotech' products) and a current status on 'Nano-Safety' issue. The first part focuses on up-to-date information of 'Nanotech' products that were already on the market as reported by Project on Emerging Nanotechnologies of the Woodrow Wilson International Center for Scholars. There are more than 500 products for a variety of applications, among which health and fitness products are the largest category. The products in this group consist of clothing, cosmetics and sunscreens. Silver is the most commonly used material, followed by carbon in the forms …
Effects Of Yttria Concentration And Microstructure On Electric Breakdown Of Yttria Stabilized Zirconia, O Jongprateep, V Petrovsky, F Dogan
Effects Of Yttria Concentration And Microstructure On Electric Breakdown Of Yttria Stabilized Zirconia, O Jongprateep, V Petrovsky, F Dogan
Journal of Metals, Materials and Minerals
Ceramic materials have great potentials for capacitor application. However, low breakdown strength of the materials remains a key challenge for development of high performance capacitors. In this study, yttria stabilized zirconia (YSZ) were fabricated and tested for breakdown strength. YSZ samples with 3, 8, and 10 mol% yttria were carefully processed to control grain size and porosity level. Experimental results revealed that breakdown strength as high as 2 MV/cm could be achieved. The breakdown strength was not significantly affected by porosity level, but it was by yttria concentration. Relationship among yttria concentration, residual porosity and breakdown strength is discussed in …
Nano-Size Hydroxyapatite Powders Preparation By Wet-Chemical Precipitation Route, N Monmaturapoj
Nano-Size Hydroxyapatite Powders Preparation By Wet-Chemical Precipitation Route, N Monmaturapoj
Journal of Metals, Materials and Minerals
In this study, wet-chemical process was performed to prepare nano-size hydroxyapatite (HA) powders (≈10 nm) by varying concentration (low, medium and high) of the starting solutions in order to increase the amount of as-dried HA powders with different process conditions. Particle sizes and density were analyzed and differential thermal analysis was used to determine the glass transition (Tg) and the onset crystallization (Tc) temperatures. XRD and SEM were performed to identify phases and microstructure. The wet-chemical precipitation using low concentration of starting solution under reflux environment could be the optimize process to induce the formation of hydroxyapatite rather than tricalcium …
Calcium Phosphate Film Coating On Titanium Substrate By Electrochemical Deposition, D P. Kashima, A Rakngarm
Calcium Phosphate Film Coating On Titanium Substrate By Electrochemical Deposition, D P. Kashima, A Rakngarm
Journal of Metals, Materials and Minerals
Calcium phosphate film on titanium substrate was achieved by electrochemical method in four different kinds of electrolyte. The pure titanium metal (99.99%) with 0.8 cm in width and 2 cm in length was used as a substrate and it was subsequently etched by 2M HF for 1 minute before electrochemical deposition. Calcium phosphate film could form at a different current density for each kind of electrolyte as follows: 10 mA/cm2 for MCPM based aqueous solution, 20 mA/cm2 for MCPM based aqueous solution with ions addition, 10 mA/cm2 and 20 mA/cm2 for MCPM based 20%V/V ethanol and 50%V/V ethanol solution, respectively. …
Surface Modification Of Bricks By Chitosan Coatings, S Nilpairach, S T. Dubas
Surface Modification Of Bricks By Chitosan Coatings, S Nilpairach, S T. Dubas
Journal of Metals, Materials and Minerals
Bricks were successfully modified by application of a chitosan coating in order to provide their surface with a water repellant character. The chitosan coating was prepared by depositing solutions of variable chitosan concentration (1% or 2.5% w/w) onto the brick surface and let to dry under ambient condition. In order to improve the water repellant property, the films were cross-linked with a 1% solution of sodium citrate, sodium sulfate or sodium tri - polyphosphate. The effect of the chitosan concentration on the morphology of the coating at the brick surface was observed by scanning electron microscope (SEM). It was found …
Improved L-929 Cell Growth From Self Assembled Pdadmac/Gelatin Thin Films, P Kittitheeranun, P Potiyaraj, T Bunaprasert, N Sanchavanakit, S T. Dubas
Improved L-929 Cell Growth From Self Assembled Pdadmac/Gelatin Thin Films, P Kittitheeranun, P Potiyaraj, T Bunaprasert, N Sanchavanakit, S T. Dubas
Journal of Metals, Materials and Minerals
This article demonstrates the advantages of using PDADMAC/gelatin over chitosan/gelatin multilayer thin films to improve L-929 mouse fibroblast growth. Although chitosan-based materials are often preferred in cell culture, we put in evidence the problematic low stability and decomposition of chitosan based film under physiological pH. Two kinds of coating were assembled using either chitosan or Poly(diallyldimethylammonium chloride) (PDADMAC) as polycationic polyelectrolyte and gelatin as the anionic counterpart. The non-toxic nature of each coating was confirmed by MTT assay for cell viability and cell proliferation. Using optical microscopy, it was observed that the L-929 fibroblast spread preferentially on the PDADMAC/gelatin surface …
Improvement Of Mechanical Properties For En Aw 6082 Aluminium Alloy Using Equal-Channel Angular Pressing (Ecap) And Post-Ecap Aging, M Fujda, T Kvačkaj, K Nagyová
Improvement Of Mechanical Properties For En Aw 6082 Aluminium Alloy Using Equal-Channel Angular Pressing (Ecap) And Post-Ecap Aging, M Fujda, T Kvačkaj, K Nagyová
Journal of Metals, Materials and Minerals
The mechanical properties and microstructure of EN AW 6082 aluminium alloy subjected to severe plastic deformation and aging treatment were compared with those of the extruded and artificially aged state (initial state). The initial state of alloy subjected to solution annealing and quenching was severely deformed at ambient temperature by equal channel angular pressing (ECAP) following route C up to three passes. Polyedric microstructure of initial state was considerably changed by the repetitive ECA-pressing. Deformation bands with different density of slip lines were observed in microstructure of ECAPed and aged states, which indicated non-uniform deformation across the cross-section of ECAPed …
Effect Of Limestone Dust On The Properties Of Thai Pottery Sintering At Low Temperature, S Sangsuk, S Khunthon, S Saenapitak, S Nilpairach
Effect Of Limestone Dust On The Properties Of Thai Pottery Sintering At Low Temperature, S Sangsuk, S Khunthon, S Saenapitak, S Nilpairach
Journal of Metals, Materials and Minerals
Limestone dust from a limestone crushing plant was used as an additive in pottery clay for this experiment. After the limestone dust was sieved through a 35 mesh stainless steel sieve, it was mixed with Angthong pottery clay at various contents. Samples with and without limestone dust were sintered at 600, 700, 900, and 1000o C. Because of limestone blowing for samples with limestone dust sintered at 900 and 1000o C, physical property measurement was performed only for samples sintered at 600 and 700o C. While sintering at low temperatures (600 and 700o C), physical properties of samples with limestone …
Morphology Controlled Calcium Ortho Phosphates Induced By Chemical Additions Under Hydrothermal Reaction, D P. Kashima, E Kongkul, T Daopradubwon
Morphology Controlled Calcium Ortho Phosphates Induced By Chemical Additions Under Hydrothermal Reaction, D P. Kashima, E Kongkul, T Daopradubwon
Journal of Metals, Materials and Minerals
Morphology controlled calcium orthophosphates under hydrothermal reaction was achieved using saturated solution of monocalcium phosphate monohydrate (MCPM) as a starting material. MCPM saturated solution was hydrothermally treated at 180°C for 4 and 12 hrs. Citric acid as a chelating agent and a mixed solution of NaNO3 and NaF were individually added into the reactor. The morphologies, phases and microstructures of the obtained products were characterized by optical microscope (OM), X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. Irregular shape crystals were obtained when a saturated solution of MCPM was autoclaved at 180°C for 4 hrs. Though citric acid was …
Effects Of Tin Powder On Properties Of Sintered Stainless Steels, N Tosangthum, P Muangtong, O Coovattanachai, M Morakotjinda, T Yodkaew, P Wila, R Krataitong, B Vetayanugul, R Tongsri
Effects Of Tin Powder On Properties Of Sintered Stainless Steels, N Tosangthum, P Muangtong, O Coovattanachai, M Morakotjinda, T Yodkaew, P Wila, R Krataitong, B Vetayanugul, R Tongsri
Journal of Metals, Materials and Minerals
It was found that addition of 4 wt.% of gas-atomized tin (Sn) powder to stainless steel powders could alter sintered properties of P/M stainless steels. For stainless steel series 300 powders, Sn powder addition resulted in improved tensile properties and hardness. It was speculated that the liquid Sn, formed during sintering process, acted as either a sintering activator or a solvent for nickel (Ni) dissolution. Sintering activation existed because the liquid Sn acted as a diffusion path for powder particle constituent atoms. Dissolution of Ni in Sn was simply due to diffusion of Ni atoms from stainless steel series 300 …
Sintered Properties Of 409l Powder Compacts Influenced By Metal Powder Additives, O Coovattanachai, T Yodkaew, M Morakotjinda, N Tosangthum, R Krataitong, A Daraphan, B Vetayanugul, R Tongsri
Sintered Properties Of 409l Powder Compacts Influenced By Metal Powder Additives, O Coovattanachai, T Yodkaew, M Morakotjinda, N Tosangthum, R Krataitong, A Daraphan, B Vetayanugul, R Tongsri
Journal of Metals, Materials and Minerals
Sintering of powder compacts, prepared by admixing of 409L powder with 2-6 wt.% of copper and nickel powders was investigated. It was observed that the strength of the 409L-Cu specimens increased with increasing Cu content. In contrast, sintered density and elongation decreased with increasing Cu content due to swelling effect. When 2 wt.% of Ni powders were added, sintered density and strengths were maximized. When Ni contents higher than 2 wt.% , the decrease of sintered density and strengths were attributed to the number of pores left by the original sites of Ni powder particles.
Sintered Fe-Al2o3and Fe-Sic Composites, T Yodkaew, M Morakotjinda, N Tosangthum, O Coovattanachai, R Krataitong, P Siriphol, B Vetayanugul, S Chakthin, N Poolthong, R Tongsri
Sintered Fe-Al2o3and Fe-Sic Composites, T Yodkaew, M Morakotjinda, N Tosangthum, O Coovattanachai, R Krataitong, P Siriphol, B Vetayanugul, S Chakthin, N Poolthong, R Tongsri
Journal of Metals, Materials and Minerals
The presence of non-reactive (Al2O3) and reactive (SiC) hard particles affected properties of sintered Fe-base composites. With the same compacting and sintering conditions, addition of Al2O3 particles caused reduction of sintered densities. Tensile strengths, elongation and hardness of the sintered Fe-Al2O3 materials decreased with increasing Al2O3 particle amounts. The presence of Al2O3 particles prohibited compacting and sintering processes of the Fe powder. In contrast, addition of SiC particles resulted in reaction between Fe and SiC particles. Sintered density of the sintered Fe-SiC composites was significantly lower than that of the sintered Fe-Al2O3 materials. However, tensile strengths and hardness, except elongation, …
Diffusion Bonding Of Stainless Astm A240 Grade 304 In Double Side Flux Cored Arc Welding, S Pitaknorachon, B Poopat
Diffusion Bonding Of Stainless Astm A240 Grade 304 In Double Side Flux Cored Arc Welding, S Pitaknorachon, B Poopat
Journal of Metals, Materials and Minerals
Double side flux cored arc welding (DS-FCAW) has been developed from conventional flux cored arc welding (FCAW). DS-FCAW, dual torches are used by placing an opposite to each other and welding on both sides simultaneously. The objective of this research paper is to investigate diffusion bonding effect due to DS-FCAW. Stainless steel ASTM A240 Grade 304 was studied. Other welding parameters were set constant except welding current and voltage. Diffusion bonding was observed even though weld profiles from macro inspection showed lack of penetration by weld metal in all experiments. It can be concluded that, at certain conditions, the welds …
Sintered Materials Prepared From Stainless Steel Series 300 And 400 Powders, M Morakotjinda, N Kuljittipipat, N Poolthong, N Tosangthum, P Wila, R Krataitong, T Yodkaew, O Coovattanachai, B Vetayanugul, R Tongsri
Sintered Materials Prepared From Stainless Steel Series 300 And 400 Powders, M Morakotjinda, N Kuljittipipat, N Poolthong, N Tosangthum, P Wila, R Krataitong, T Yodkaew, O Coovattanachai, B Vetayanugul, R Tongsri
Journal of Metals, Materials and Minerals
Some sintered materials were prepared from mixtures of stainless steel series 300 and series 400 powders. The sintered stainless steels consisted of both austenitic and ferritic phases so they were designated as sintered duplex stainless steels (SDSSs). Microstructures and properties of the SDSSs were characterized and tested. Most SDSSs, except the 310L powder-base SDSSs, showed improved tensile strengths and hardness but exhibited inferior ductility, compared to those of the sintered stainless steels series 300. The 304L-410L SDSS showed promising mechanical properties. This SDSS were further investigated by varying weight ratio of 304L and 410L powders. It was found that sintered …