The kinetics and mechanism of titanium hydride formation

A. Efron; Y. Lifshitz; I. Lewkowicz; M. H. Mintz

doi:10.1016/0022-5088(89)90529-8

The kinetics and mechanism of titanium hydride formation

A. Efron
, Y. Lifshitz
, I. Lewkowicz
, M. H. Mintz

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

The kinetics and mechanism of titanium hydride formation were studied by measurements of overall reaction rates combined with metallographic examinations of partially hydrided samples. The main part of the reaction involves the formation of a continuous protective hydride layer which progresses into the sample. Paralinear rate equations fit the kinetic behaviour over a pressure range of 30-450 Torr H₂ and temperatures of 100-250 °C. The reaction rate is controlled by the diffusion of hydrogen through the protective thickening product layer which finally reaches an apparently constant thickness for diffusion as a result of cracking on the outer surface. This maximum thickness is temperature dependent and increases abruptly above approximately 150 °C. A corresponding apparent deviation from Arrhenius dependence is observed in the linear rate constants. Morphological aspects of hydride development are described. The effect of the metal microstructure on the hydriding kinetics is discussed.

Original language	English
Pages (from-to)	23-34
Number of pages	12
Journal	Journal of The Less-Common Metals
Volume	153
Issue number	1
DOIs	https://doi.org/10.1016/0022-5088(89)90529-8
State	Published - 15 Jul 1989
Externally published	Yes

ASJC Scopus subject areas

General Engineering

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10.1016/0022-5088(89)90529-8

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AU - Efron, A.

AU - Lifshitz, Y.

AU - Lewkowicz, I.

AU - Mintz, M. H.

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Y1 - 1989/7/15

N2 - The kinetics and mechanism of titanium hydride formation were studied by measurements of overall reaction rates combined with metallographic examinations of partially hydrided samples. The main part of the reaction involves the formation of a continuous protective hydride layer which progresses into the sample. Paralinear rate equations fit the kinetic behaviour over a pressure range of 30-450 Torr H2 and temperatures of 100-250 °C. The reaction rate is controlled by the diffusion of hydrogen through the protective thickening product layer which finally reaches an apparently constant thickness for diffusion as a result of cracking on the outer surface. This maximum thickness is temperature dependent and increases abruptly above approximately 150 °C. A corresponding apparent deviation from Arrhenius dependence is observed in the linear rate constants. Morphological aspects of hydride development are described. The effect of the metal microstructure on the hydriding kinetics is discussed.

AB - The kinetics and mechanism of titanium hydride formation were studied by measurements of overall reaction rates combined with metallographic examinations of partially hydrided samples. The main part of the reaction involves the formation of a continuous protective hydride layer which progresses into the sample. Paralinear rate equations fit the kinetic behaviour over a pressure range of 30-450 Torr H2 and temperatures of 100-250 °C. The reaction rate is controlled by the diffusion of hydrogen through the protective thickening product layer which finally reaches an apparently constant thickness for diffusion as a result of cracking on the outer surface. This maximum thickness is temperature dependent and increases abruptly above approximately 150 °C. A corresponding apparent deviation from Arrhenius dependence is observed in the linear rate constants. Morphological aspects of hydride development are described. The effect of the metal microstructure on the hydriding kinetics is discussed.

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DO - 10.1016/0022-5088(89)90529-8

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EP - 34

JO - Journal of The Less-Common Metals

JF - Journal of The Less-Common Metals

IS - 1

ER -

The kinetics and mechanism of titanium hydride formation

Abstract

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