Government College

About: Government College is a based out in . It is known for research contribution in the topics: Population & Ring (chemistry). The organization has 4481 authors who have published 5986 publications receiving 57398 citations.

Effects of rare earth ions (Tb, Ce, Eu, Dy) on the thermoluminescence characteristics of sol-gel derived and γ-irradiated SiO2 nanoparticles.

Abstract: Highly pure SiO2 and SiO2:RE nanoparticles were synthesized by the sol–gel method The morphological, structural and optical properties of the nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) XRD results indicate that all the samples studied were free from impurities SEM/TEM results indicate that the samples were well dispersed Surface characterization of the nanocrystals by Fourier transform infrared spectroscopy has been carried out and the structure of surface-bound SiO2 based on spectral analysis is proposed Thermoluminescence (TL) characteristics were investigated to study the influence of rare earth dopants (Tb, Ce, Eu, Dy) on SiO2 matrix subjected to 05 kG (1 h) γ-irradiation Among these rare earth elements, Eu3+ was found to be the most efficient dopant for SiO2 showing maximum thermoluminescence intensity SiO2:Eu05 seems to be a promising candidate for use as a TL dosimeter Copyright © 2013 John Wiley & Sons, Ltd

Experimental investigations on WEDM process for machining High Manganese steel

Abstract: High Manganese steel ASTM A128 is a very hard metal and production of components using a conventional machining process is very difficult and also the quality of the products are not favorable for ...

Accelerated Hot Corrosion Studies of D-Gun-Sprayed Cr 2 O 3 –50% Al 2 O 3 Coating on Boiler Steel and Fe-Based Superalloy

Abstract: In the current investigation, Cr2O3–50% Al2O3 coating was deposited on ASTM-SA213-T-22 boiler steel and Fe-based superalloy Superfer 800H by D-gun spray process. The high-temperature corrosion performance of the coated as well as bare alloys was evaluated in Na2SO4–60%V2O5 molten salt, an aggressive environment at 900 °C under cyclic conditions. The kinetics of the corrosion were analyzed by the change in weight measurements which were taken after each cycle (i.e., 1-h heating in a tube furnace followed by 20-min cooling in ambient air) for a total period of 50 cycles. The X-ray diffraction and scanning electron microscopy/energy-dispersive X-ray analysis techniques were used for the analysis of corrosion products. During investigations, it was found that both the selected bare alloys have suffered intensive spallation in the form of removal of their oxide scales, which may be attributed to the formation of non-protective Fe2O3-dominated oxide scales, whereas the coated alloys have shown lesser weight gains along with better adhesiveness of the oxide scales with the substrate till the end of the experiment. The oxides of chromium and aluminum were the main phases revealed in the oxide scales of the coated specimens, which are reported to be protective against the hot corrosion.