Synthesis and hydrogen absorption kinetics of V4Cr4Ti alloy
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V4Cr4Ti alloy is synthesized by aluminothermy process followed by electron beam refining. Hydrogen absorption characteristics of the alloy have been evaluated by measuring the pressure composition isotherm (PCIT) at 57 °C temperature. Two plateau pressures are observed in the PCIT curve. Substantial decrease in the hydrogen absorption capacity of the alloy as compared to vanadium has been recorded. Hydrogen absorption kinetics of the alloy was investigated in the temperature range of 200–500 °C. Three-dimensional diffusion appears to be the rate controlling step of the hydrogen absorption. The apparent activation energy was calculated as 0.16 eV/atom-hydrogen.
KeywordsIsothermal TG Activation energy Diffusion process Hydrogen storage Aluminothermy
The authors record their sincere appreciation of Dr. Anamika Singh, Research Associate, Department of Biotechnology, Government of India, Mr. Samarjeet Kumar of Tata Consultancy Services, Mumbai and Amit Tirpude from IIT Bombay for their technical assistance during the data analysis.
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