Study of Reaction Kinetics of titanium hydride powder with aluminum melt

Authors

1 Department of Materials, Faculty of Engineering, Tarbiat Modaress University, Tehran, Iran, P.O.:14115-143

2 School of Metallurgy and Materials Engineering, member of Center of Excellence for Advanced Material and Processing (CEAMP), Iran University of Science and Technology, Tehran, Iran, P.O.:16844.

Abstract

In this research, the reaction kinetics of TiH2 powder in contact with pure aluminum melt at various temperatures on the basis of measuring the released hydrogen gas pressure was studied. To determine the mechanism the reaction, after Solidification of samples, interface of TiH2 powder in contact with melt was studied. The results showed that PH2-time curves had three regions. In the first and second regions, the rate of reaction conforms to zero and first order, respectively. In the third region, hydrogen gas pressure remains constant and the rate of reaction becomes zero order. In the first and second regions, the main factors controlling the rate of reaction are diffusion of hydrogen atoms within titanium lattice and chemical reaction of titanium with aluminum melt, respectively. Based on the main factors controlling the rate of reaction, three temperature ranges can be considered for reaction mechanism, a) 700-750ºC, b) 750-800ºC and c) 800-1000ºC. In the temperature range (a), the reaction is mostly chemical reaction control. In the temperature range (b), the reaction is diffusion and chemical reaction control, and in the temperature range (c), the reaction is mostly diffusion control.

Keywords

Journal of Advanced Materials in Engineering (Esteghlal)
Volume 29, Issue 1
June 2010
Pages 57-71

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