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  • 1
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    Isoconversional and Isokinetic Studies of 2605SA1 Metglass (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-02-18
    Description: Isoconversional methods (KAS,OFW,Li-Tang,and Vyazovkin) as well as isokinetic methods ((IKP) and CR) are used to determine the activation energy for crystallization (E), pre-exponential factor (A) and the conversion function f(α), for Fe-based 2605SA1 metallic glass.The non-isothennal differential scanning calorimetry data obtained at different heating rates ranging from 2 to 10 K/min are utilized for the analysis. The E for the peak I and II obtained by the IKP method are in good agreement with the values obtained from various isoconversional methods. The calculated kinetic triplets from IKP for peak I is: E = 445.6 ± 24 kJ/mol, A = 9.4 × 10 22 sec −1 and f(α) = [-ln(l-α)] 1/4 and for peak II is : E=325.7 ± 8 kJ/mol, A= 7.1 × 10 15 sec −1 and f(α) = α 1/4 . All the above mentioned methods are summarized and discussed elaborately from the point of view of their applicability and correctness.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
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    Hydrogen as fuel carrier in PEM fuelcell for automobile applications (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-02-18
    Description: The present work focuses the application of nanostructured materials for storing of hydrogen in different carbon materials by physisorption method. To market a hydrogen-fuel cell vehicle as competitively as the present internal combustion engine vehicles, there is a need for materials that can store a minimum of 6.5wt% of hydrogen. Carbon materials are being heavily investigated because of their promise to offer an economical solution to the challenge of safe storage of large hydrogen quantities. Hydrogen is important as a new source of energy for automotive applications. It is clear that the key challenge in developing this technology is hydrogen storage. Combustion of fossil fuels and their overuse is at present a serious concern as it is creates severe air pollution and global environmental problems; like global warming, acid rains, ozone depletion in stratosphere etc. This necessitated the search for possible alternative sources of energy. Though there are a number of primar...
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  • 3
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    Preparation and characterization of perovskite Cu doped LaFeO 3 semiconductor ceramics (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-02-18
    Description: Orthorhombic structured polycrystalline Cu doped LaFeO 3 perovskite ceramics were prepared by sol-gel route and characterized by X-ray diffraction (XRD), differential thermal analysis (DTA), Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopic (FT-IR) techniques. The complex dielectric properties for these ceramic samples investigated as function of temperature, in the range 80K – 300K, and frequency, in the range 20 Hz -1MHz. These samples exhibiting colossal dielectric constant value of 10 4 near room temperature at low frequencies. The response is similar to that observed for relaxor ferroelectrics. Impedance spectroscopy (IS) data analysis indicates the ceramics to be electrically heterogeneous semiconductors consisting of semiconducting grains with dielectric constant below 100. We conclude, therefore that grain boundary effects is the primary source for the high effective dielectric constant in Cu doped LaFeO 3 ceram...
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  • 4
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    Crystallization kinetics of Fe based amorphous alloy (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-02-18
    Description: Differential Scanning Calorimetry(DSC) experimental data under non-isothermal conditions for Fe based Metglas 2605SA1 (wt% Fe=85-95, Si=5-10, B=1-5) metallic glass ribbons are reported and discussed. The DSC Scans performed at different heating rates showed two step crystallization processes and are interpreted in terms of different models like Kissinger, Ozawa, Boswell, Augis & Bennett and Gao & Wang. From the heating rate dependence of the onset temperature (T o ) and the crystallization peak temperature (T p ), the kinetic triplet, activation energy of crystallization (E), Avrami exponent (n) and the frequency factor (A) are determined. The determined E for peak I is 354.5 ± 2.5 kJ/mol and for the peak II is 348.2 ± 2.2 kJ/mol, respectively. The frequency factor for peak I is 1.1 × 10 23 sec −1 and for peak II is 6.1 × 10 20 sec −1 .
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  • 5
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    Upconversion luminescence in Er 3+ /Yb 3+ codoped PbO-Bi 2 O 3 -AI 2 O 3 -B 2 O 3 glasses (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-02-18
    Description: Er 3+ /Yb 3+ co-doped glasses with the composition PbO-Bi 2 O 3 -Al 2 O 3 -B 2 O 3 were prepared by melt quenching method. Optical absorption (OA) and photoluminescence (PL) and FT-IR spectra of all the glasses were recorded at room temperature. Green and red upconversion emissions centered at 525, 545 and 654 nm corresponding to 2 H 11/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 and 4 F 9/2 → 4 I 15/2 transitions of Er 3+ ions have been obtained under the excitation of 980 nm laser at room temperature. From emission spectra it was observed that the intensity of red emission increases with increasing the concentration of Er 3+ ions upto 0.8 mol% and decreases with the further increase in the concentration of Er 3+ ions. The spectra have been analyzed in the light of str...
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  • 6
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    Dielectric studies of Fe Doped SmCrO 3 Perovskites (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-02-18
    Description: Polycrystalline Fe doped SmCrO 3 perovskite ceramics were prepared by sol-gel route and characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), dielectric and Impedance measurements. Single-phase perovskite Fe doped SmCrO 3 obtained has been confirmed from the XRD pattern with orthorhombic structure. The dielectric properties of perovskite Fe doped SmCrO 3 ceramics were studied in the frequency range of 100Hz – 1MHz in the temperature range from 80 K to 300 K. These materials exhibited colossal dielectric constant value of ~ 10 4 at room temperature. The response is similar to that observed for relaxor-ferroelectrics. To get the detailed information, IS data analysis was performed.
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  • 7
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    Optimizing Bursting Effect of Submarine Pressure Hull Under Radial Stresses (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-12-20
    Description: Pressure hulls are the main load bearing structures of naval submarines, and autonomous underwater vehicles (AUVs). A pressure hull is a structure that is designed to withstand the compressive forces associated with hydrostatic pressure. The most efficient geometries for resisting these compressive forces are circular cross-sections, and thus, pressure hulls are typically composed of a combination of ring-stiffened cylinders and cones, with spherical or torispherical domes at either end. The design and manufacturing process of a pressure hull is a cumbersome engineering challenge because of the extreme pressure conditions and extremely low tolerances required. Now a days Burst effect in cylindrical components form a worst loss in manufacturing sector. Burst effect is a failure condition which occurs a cylindrical components subjected to huge amount of internal pressure (Radial stresses). Reduction of Burst effect is a best solution for making safe pressure hull under huge amount...
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  • 8
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    Bond Strength of HYSD Bars and SCC with and without Recycled Aggregate-An Experimental Study (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-09
    Description: Self Compacting Concrete (SCC) has become inevitable in the current scenario of construction of large and complex structures with heavy reinforcement and complicated shapes. Using normal concrete in such situation may often result in inadequate compaction, affecting performance and long-term durability of structures. In addition, the use of Recycled Concrete Aggregate (RCA) is gaining importance throughout the globe due to the depleting sources of natural aggregate and disposal problem of demolished waste. There is a little work done on the behaviour of SCC with RCA. Therefore, a comprehensive experimental investigation on bond strength and modes of failure of Self Compacting Concrete (SCC) with and without Recycled Concrete Aggregate (RCA) was carried out and the results are presented. The variables studied include grade of concrete (M20, M40 and M60), Percentage of RCA (0% to 100%), diameter of bar (10, 12 and 16) and percentage embedment length. All specimens were tested by c...
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  • 9
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    Impedance spectroscopy and permittivity investigation of NdCrO 3 perovskite ceramic nanoparticles (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-10-24
    Description: The NdCrO 3 Perovskite Ceramic Compound has prepared by Sol-gel auto-combustion technique. The X-ray diffraction analysis confirmed that single-phase orthorhombic structure. The average size of the grain has estimated and it has found to be ∼50nm. The impedance and permittivity investigations of NdCrO 3 Perovskite Ceramic Nanoparticles have performed in the frequency range 20Hz-1MHz and temperature range 150-300K. Impedance spectroscopy studies indicate the presence of grain and grain boundary relaxations in the compound. The polarization mechanism is suggests for change in the dielectric constant and loss with temperature. The Impedance analysis supports the typical behavior NTCR of material. The temperature dependent relaxation time for both grain and grain boundary follows the Arrhenius law.
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  • 10
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    Experimental investigation on Utilization of RCA in Low, Medium and High Strength Self Compacting Concrete (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-09
    Description: Self Compacting Concrete (SCC), owing to its advantages, is now a buzz word in the present construction industry. The application of recycled aggregates in concrete mixes is widely investigated. The present investigation focuses on the use of RCA in SCC. The variables of study include grade of concrete (Normal, standard grade and high strength), RCA content (0 to 100%) and age of concrete (7 and 28 days). The parameters of investigation are fresh and hardened state properties, viz. compressive, split tensile and flexural strengths. The mix design was carried out based on modified Nan Su method. The fresh state properties were satisfied for all RCA contents in all the three grades of concretes tested. The test results were encouraging and the target mean strength could be attained in M30 concrete even with 50% RCA as replacement of natural aggregate. However, a reduction in strength was observed as the grade of concrete increased. Optimum RCA content was arrived at based on the s...
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