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653 results on '"Mudali, U. Kamachi"'

106. Enthalpy measurements on rare earth hafnates RE2O3·2HfO2 (s) (RE = Sm, Eu, Dy).

Author

Kandan, R., Prabhakara Reddy, B., Panneerselvam, G., and Mudali, U. Kamachi

Subjects
NUCLEAR reactor control, HEAT of reaction, BORON carbides, SAMARIUM, EUROPIUM, GADOLINIUM, BOILING water reactors
Abstract

Compounds of the general formula RE2O3·2HfO2 with RE = Sm, Eu, Gd, Dy, etc., are considered potential candidate materials for use in the control rods of future nuclear reactors. Sm2O3·2HfO2, Eu2O3·2HfO2, and Dy2O3·2HfO2 were prepared by solid-state route and characterized by XRD technique. Enthalpy increment measurements have been carried out on these compounds in the temperature range 730–1679 K by inverse drop method by using a high-temperature differential calorimeter. From the enthalpy values, other thermodynamic functions, namely heat capacity, entropy, and Gibbs energy functions, were computed. The polynomial expressions of enthalpy increments obtained for rare earth hafnate in the temperature range 298–1700 K is given as:HT0-H2980/J mol-1=259.890T+21.610×10-3T2+32.389×105T-1-90,271—Sm2O3·2HfO2HT0-H2980/Jmol-1=261.134T+22.273×10-3T2+25.988×105T-1-88,553—Eu2O3·2HfO2HT0-H2980/Jmol-1=255.016T+18.030×10-3T2+29.332×105T-1-87,474—Dy2O3·2HfO2 [ABSTRACT FROM AUTHOR]

Published
2018
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107. Corrosion resistance of pyrolytic graphite in LiCl-KCl-UCl3 molten salt for pyrochemical reprocessing application.

Author

Madhura, B., Rao, Ch. Jagadeeswara, Vetrivendan, E., Ningshen, S., Mallika, C., and Mudali, U. Kamachi

Subjects
ELECTRIC properties of materials, PYROLYTIC graphite, FUSED salts, OXIDATION, HIGH temperatures, X-ray diffraction
Abstract

Pyrolytic graphite (PyG) is a highly oriented, dense and crystalline form of graphite, which exhibits superior air oxidation resistance, corrosion resistance, and favourable mechanical, thermal, and electrical properties compared to conventional graphite materials. It is proposed as the material of construction for high-temperature molten LiCl-KCl for pyrochemical reprocessing of metallic fuel. In the present study, long-term corrosion behaviour of PyG in LiCl-KCl molten salt with 5 wt-% UCl3 was evaluated by immersion studies at 873 K for 2000 h, under inert argon atmosphere. Characterisation of PyG before and after molten salt exposure was carried out using X-ray diffraction technique, scanning electron microscope with energy dispersive spectroscopy, laser Raman spectroscopy and X-ray photo-electron spectroscopy. The results revealed the superior corrosion resistance and excellent phase stability of PyG with negligible weight change and no appreciable change in the surface chemistry and morphology up to the exposure time of 2000 h. [ABSTRACT FROM AUTHOR]

Published
2018
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142. Superhydrophobic Coating on Mod.9Cr-1Mo Ferritic Steel for Enhancing Corrosion Resistance and Antibacterial Activity.

Author

Vizhi, M. Ezhil, Vanithakumari, S. C., George, R. P., Vasantha, S., and Mudali, U. Kamachi

Abstract

A novel and facile approach like polishing as well as etching followed by dip coating using low surface energy material, perfluoro octyl tri ethoxy silane was attempted to create superhydrophobic (SHP) surface modification on Mod.9Cr-1Mo. A water contact angle (CA) of 150° ± 1° was achieved with advancing angle (θadv) as 163°, Receding Angle (θrec) as 148°, contact angle hysteresis (CAH) as 15º and tilting angle (TA) as 7º. Characterization of the surface by atomic force microscopy and surface profilometer revealed the micro–nano topography on the surface ranging between 63.5 nm and 4.3 µm. The enhanced corrosion performance and the antibacterial properties were confirmed using electrochemical impedance spectroscopy (EIS) and epifluorescence microscopy. [ABSTRACT FROM AUTHOR]

Published
2016
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143. Nanocontainer Impregnated Self-Healing Coatings for Active Corrosion Protection of Modified 9Cr-1Mo Ferritic Steel.

Author

Chenan, Arunchandran, George, R. P., and Mudali, U. Kamachi

Abstract

This study displays the influence of TiO2 nanocontainers loaded with corrosion inhibitor 2-mercaptobenzothiazole into hybrid organic-inorganic coatings on the active corrosion protection of modified 9Cr-1Mo ferritic steels. The corrosion resistance and the self-healing effects of this hybrid passive barrier coating with and without the addition of inhibitor-loaded TiO2 nanocontainers were studied using electrochemical impedance spectroscopy (EIS). EIS analysis revealed that inhibitor-loaded nanocontainer impregnated coatings showed enhanced corrosion protection as a result of the release of inhibitor molecules from the nanocontainers. Later these titania nanocontainers were used to fabricate inhibitor-loaded nanocontainer mixed hybrid coating with epoxy topcoating. Along with the reference (plain top epoxy) coating, these samples were exposed to neutral salt spray test in a salt spray cabinet in order to investigate the long-term corrosion protection and the self-healing efficiency of the nanocontainer mixed epoxy coating. The salt spray chamber test showed sufficient protection even after 1,000 h of exposure for inhibitor-loaded nanocontainer mixed epoxy coating compared to that of reference coating. An enhancement in the corrosion protection performance of the coatings resulting from the loaded nanocontainers was observed from the results of the present study. [ABSTRACT FROM AUTHOR]

Published
2016
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