International Research Journal of Materials Sciences and Applications


Abrasion Resistance of Thermally Treated Beech Wood

Research Article of International Research Journal of Materials Sciences and Applications Abrasion Resistance of Thermally Treated Beech Wood Rastislav Lagaňa Department of Wood Science, Faculty of Wood Sciences and Technology, Technical University in Zvolen, Slovakia The study focused on the abrasion resistance of beech wood thermally treated at high temperatures. A standard test for determining abradability, according to ISO 4649, was used. We studied factors such as the anatomical direction, temperature of treatment, and duration of treatment, as well as their effects on abrasion resistance performance. Four temperature levels (20 °C, 160 °C, 180 °C, and 200 °C) and three durations of treatment (1 h, 3 h, and 5 h) were used. Results showed that the anatomical direction was not a significant factor, but there was a strong influence of temperature and duration of treatment, respectively, on abrasion resistance. Due to a strong correlation between moisture content and abrasion resistance, the equilibrium moisture content of thermally treated wood could be used for the prediction of abrasion resistance Keywords: Abradability, thermal treatment, beech, abrasion resistance ...

Metallurgical Perspective of AISI 301LN (EN 1.4318) Grade Austenitic Stainless Steel for Future Transport Applications

Review Article of International Research Journal of Materials Sciences and Applications Metallurgical Perspective of AISI 301LN (EN 1.4318) Grade Austenitic Stainless Steel for Future Transport Applications Debasish Chatterjee Adjunct Assistant Professor Practice, Department of Metallurgy and Materials Engineering, VNIT Nagpur, India Recently AISI 301LN grade austenitic stainless steel shows potential applications in manufacturing metro coach, oil tankers, bus body structures and wheels etc. Extensive strain induced martensite (SIM) formation property at crack tip of this steel helps toreduce frequent failure of this material. Formation of hard phase ‘SIM’ at crack tip delay crack propagation during fracture. In this way this type of steel promotes to make safe structural components. To fulfill European commission target before the year 2030, several attempts are going to enhance the mechanical performance of this particular steel by applyingadvanced thermomechanical treatments.In this regard only cold rolling and annealing treatments were used extensively in pastto make nano/ultra-fine grain structure, so that better structural properties can be achieved. It was found that, best mechanical properties (830 MPa Y.S., 953 MPa U.T.S., 36% elongation) were achieved after 80% cold rolling of this steel at ice-water mixture and annealing at 7000C for 20 minutes due to formation of ultra-fine grain (~0.74µm) structure. So in this review article all its thermomechanical properties are explored to find a scope towards further enhancement of its mechanical properties by advanced thermomechanicaltreatment to make safe body white structure of a vehicle. Keywords: Strain Induced Martensite (SIM), Austenite, Lath and Dislocation Cell Martensite, Twin, Nano-Grains, Rail Coach ...

Characterization and Cu(II) adsorption properties of activated carbons prepared from cotton stalk by one-step H3PO4 activation.

Research Article of International Research Journal of Materials Sciences and Applications Characterization and Cu(II) adsorption properties of activated carbons prepared from cotton stalk by one-step H3PO4 activation. Pierre Gerard TCHIETA, NKANA NKANA Gilbert Romeo, Charles Melea KEDE* Bio-organic, Analytical and Structural Chemistry Laboratory, Faculty of Science, University of Douala; BP 24157 Douala, Cameroon In the present study adsorption of copper (II) ions from aqueous solution by activated carbon was produced from cotton stalks husk via thermal pretreatment preceding chemical modification with phosphoric acid was investigated under batch mode. The biosorbent was characterized by thermo-gravimetric analysis, Fourier transform infrared (FT-IR) and iodine number. The influence of copper concentration, contact time, and temperature was studied. Sorption equilibrium time was observed in 30 min. The equilibrium adsorption data were correlated with Freundlich and Langmuir adsorption isotherm models. The kinetics of the adsorption process was tested by pseudo- first-order, pseudo-second order and Intra-particle diffusion. It was shown that adsorption of copper could be described by the pseudo-second order kinetic model. Thermodynamic parameters such as Gibbs free energy (∆G0), the enthalpy (∆H0) and the entropy change of sorption (∆S0) have also been evaluated and it has been found that the adsorption process was spontaneous, feasible and endothermic in nature. The results indicated that Activated carbon was produced from cotton stalks husk can be used as an effective and low-cost adsorbent to remove copper (II) from aqueous solution. Keywords:Heavy metals, adsorption, isotherms, kinetics, thermodynamics ...

Optimizing the Surface Quality of Textile Composites for Bonded Repairs

Research Article of International Research Journal of Materials Sciences and Applications Optimizing the Surface Quality of Textile Composites for Bonded Repairs Riddhi Naik and Sunil Joshi Department of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore. With the accelerated use of woven composites in many industries like aerospace, marine, sports, construction, automobile and many more their repairs have become an inevitable part of it. The current problem with repairs is, even with precise machining there are bond failures due to inadequate surface quality. In this research, machining techniques like stepped and scarf repairs and abrasion techniques are used on the woven coupons to evaluate their influence on the surface characteristics. Preliminary evaluation of the surface characteristics is done using a surface profiler, to measure the topographical features like surface roughness and amplitude of the peaks and valleys. Further, the results obtained from the profiler are validated using microscopy and contact angle test to identify the trend between surface roughness and wettability. Finally, the results obtained from the various experiments helps us to identify an optimum surface quality needed prior to bonding in terms of surface roughness and contact angle. The results for 3K woven glass fibre shows an optimum surface roughness in the range of 2-4 µm and contact angle below 60˚ Keywords: Surface modification; Surface quality, Microscopy, Surface roughness Ra and Arithmetic mean roughness Rz ...

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International Research Journal of Materials Sciences and Applications

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