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Publications (31)
Molybdenum is a strategic and high temperature refractory metal which is not found in nature in free state, it is predominantly found in earth’s crust in the form of MoO3/MoS2. The main disadvantage of the industrial treatment of Mo concentrate is that the process contains many stages and requires very high temperature. Almost in every step many ga...
Direct reduced iron (DRI) is obtained from iron ore by reduction using microwave assisted low temperature hydrogen plasma. The process includes steps of: (a) loading iron ore onto a sample holder (b) placing the sample holder inside a chamber followed by evacuating the chamber; (c) introducing hydrogen gas in the chamber at flow rate ranging betwee...
This article reports on feasibility experiments carried out with oxy-acetylene spray system with various oxygen to fuel ratios using two different tungsten carbide powders and powder feeding methods, to evaluate the newly developed fused WC, synthesised by transferred arc thermal plasma method. Transferred arc thermal plasma method is more economic...
Density variations of the superconductor core during the powder-in-tube (PIT) fabrication of Ag/BPSCCO monolayer tapes have been studied. The PIT procedure involved steps such as filling the tubes with precursor powder, rich in 2212 phase, with packing densities in the range 20 - 55% of theoretical density, groove rolling, flat rolling and finally...
Coexistence of pyrochlore phase is one of the major problems in the preparation of lead magnesium niobate (PMN) based perovskites
as it leads to deterioration of the dielectric and piezoelectric properties. Although the columbite precursor method substantially
reduces the formation of pyrochlore phase, the success of this process depends on various...
Polycrystalline tin oxide films were obtained by post-oxidation annealing of tin films in oxygen atmosphere at a temperature of 873 K for 60 min. The surface texture and physical properties of the tin oxide films were found to be influenced by the rate of cooling of the annealed tin films. A rapid cooling to room temperature of the tin films after...
Coexistence of pyrochlore phase is one of the major problems in the preparation of lead magnesium niobate (PMN) based perovskites as it leads to deterioration of the dielectric and piezoelectric properties. Although the columbite precursor method substantially reduces the formation of pyrochlore phase, the success of this process depends on various...
Silver clad Bi-2223 tapes with consistently high critical current densities of over 30,000 A/cm2 at 77 K and zero field were prepared by powder-in-tube (PIT) technique. Powder XRD, electron microscopy, a.c. susceptibility
and critical current measurements were used to study the phase assemblage, microstructure and transport properties of these
tape...
Stoichiometric polycrystalline tin oxide thin films were deposited by the reactive evaporation of tin and the SnO2 formation was found to be strongly dependent on the deposition parameters. The preferred orientation of the SnO2 films deposited on different substrates was varying due to the dislocation defects arising during the thin film formation....
The effect of the initial stoichiometry variation (variation in Bi, Pb, Sr, Ca and Cu) on various structural and superconducting properties of Pb-doped Bi-based superconductor has been studied. The sample having the initial stoichiometry of (Bi1.8Pb0.4)Sr2Ca2.2Cu3O10 was found to give best structural and superconducting properties. The most importa...
The influence of oxygen partial pressure and temperature on oriented grain growth of YBa2Cu3O7- delta has been investigated. A faster growth at low oxygen partial pressures and the requirement of a higher processing temperature for a similar growth at higher oxygen partial pressures were observed. A possible mechanism for this is suggested along th...
Work of fracture (WOF) of unidirectionally aligned sisal-glass hybrid laminates, especially glass core — sisal shell (SGS) laminates, have been studied using flat charpy test. Keeping the volume fraction of sisal at about 0.4, the WOF of SGS laminates linearly increased from 80.2 to 228 kJ m–2 by varying the volume fraction of glass at the core (V...
The aim of the investigation is to evaluate the enhancement in the proper ties of coir-polyester composites by incorporating glass as intimate mix with coir. Addi tion of relatively small volume fraction (0.05) of glass enhances the tensile strength by about 100%, flexural strength by more than 50 % and impact strength by more than 100 % . Coir-gla...
There is a growing interest in the development of new materials which enhance optimal utilization of natural resources, and particularly, of renewable resources. Natural fibres such as jute, coir and sisal belong to this category. This paper describes systematic work carried out so far on the structure-property relationship of these fibres includin...
Superconducting silver composite of BiPbSrCaCuO system having Ag content 4–37 wt% were prepared by sintering in air. The Tc(0) for all the composites were found to be between 107–110 K. It was observed that the room temperature resistivity and contact resistance decrease drastically by the silver addition. The effects of Ag addition on the for...
BiPbSrCaCuO superconductor was prepared. XRD and SEM were used to study the oriented grain growth. Oriented grain growth was found to increase with sintering time.
YBCO compound was prepared at different oxygen partial pressures. XRD, SEM and particle size analyser were used to study the oriented grain growth. Oriented grain growth was found maximum at oxygen partial pressure about 17–20%.
Oriented grain growth has been observed in YBCO superconducting material by cold pressing and heat treatment in specific temperature range. The degree of orientation was found to depend on the pressure, period of pressing and heat treatment cycle. Specimens having different degrees of oriented grains have been prepared. Critical current density has...
The structural changes accompanying small stoichiometric variations around 1–2–3 composition in the Y-Ba-Cu-O compound have been investigated. Ba-deficient composition is found to give considerable orientation along (001). This oriented powder gives a higher current density compared to the unoriented powder. The temperature has been correlated with...
Little analysis has been made to correlate the impact behavior of natural fiber composites with the fiber properties. It is with this view that the present study on the impact properties of natural fiber composites has been undertaken. Unidirectionally aligned fiber/polyester composites containing ca. 0. 5 volume fraction of sisal, pineapple, banan...
An attempt is made in this paper to arrive at an empirical relationship between the structure and properties of lignocellulosic fibres through computer analysis. Significant regression equations for ultimate tensile strength (UTS) and percentage elongation of these fibres with structural parameters such as chemical composition, microfibril angle et...
Natural fibers are an abundantly available resource in many developing and less developed countries, but they are presently underutilized due to a lack of understanding of their structure and properties. This paper describes a systematic study of the physical and mechanical properties of some natural fibers, together with their fracture mode.
The stress-strain curves for pineapple leaf fibre have been analysed. Ultimate tensile strength (UTS), initial modulus (YM), average modulus (AM) and elongation of fibres have been calculated as functions of fibre diameter test length and test speed. UTS, YM, and elongation lie in the range of 362 to 748 MN m–2, 25 to 36 GN m–2, and 2.0 to 2.8%, re...
The mechanical properties of palmyrah and talipot fibres have been evaluated. Like other natural fibres, these fibres were also found to be viscoelastic in nature. The variation of the initial modulus (YM), ultimate tensile strength (UTS) and elongation (%) values were determined as a function of fibre fineness, test length and speed of testing. Ch...
The stress-strain curve for sisal fibres has been experimentally determined. Ultimate tensile strength (UTS), initial modulus (YM), average modulus (AM) and per cent elongation at break of fibres have been measured as function of fibre diameter, test length and test speed. UTS, YM, AM and per cent elongation lie in the range 530 to 630 MN m–2, 17 t...
Anisotropy of X-ray structural parameters of the three phase model proposed by Mitra and Mukherjee (ref.2), has been investigated in the case of cellulose fibres of ramie, hemp and jute. The structural parameters have been determined separately from each of the observable equatorial reflections. It has been found that the parameter degree of crysta...
