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Diffusion of hydrogen in hafnium and titanium

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Abstract

We measured the coefficients of diffusion of hydrogen in the hydride phases of hafnium and titanium at 1073–1273°K on the basis of the solutions of Fick's second law for diffusion in a finite cylinder and in a sector of it.

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Abbreviations

Co :

initial concentration of gas in the metal, ncm3/cm 3Me

C(r,ϕ, z, t):

instantaneous gas concentration in the finite cylinder

i, k, m, n:

ordinal numbers (indices)

Jn(μn ir/R):

Bessel function of order n

μn i :

i-th root of the Bessel function of order n

R,l :

radius and thickness of the specimen, cm

D:

diffusion coefficient, cm2/sec

t:

time, sec

V:

calibrated volume above specimen, cm3

F:

admittance of gas pumping channels, ncm3/sec

dQre1/dt:

rate of gas release, ncm3/sec

p:

pressure of released gas, torr

dp/dt:

change in released-gas pressure per unit time, torr/sec

tan η:

tangent of the angle of inclination of the straight line in equation (6), 1/sec

IH2 :

ion current of hydrogen

Γ(n):

gamma function

W:

coefficient of variation, %

σ:

mean-square deviation

Do :

preexponent, cm2/sec

E:

activation energy, kJ/mole

T:

absolute temperature of specimens

B:

universal gas constant, kJ/ deg·mole

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Authors
  1. V. M. Katlinskii
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  2. L. L. Kotlik
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  3. V. M. Egorova
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  4. A. M. Viktorova
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Additional information

Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 39, No. 4, pp. 643–648, October, 1980.

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Katlinskii, V.M., Kotlik, L.L., Egorova, V.M. et al. Diffusion of hydrogen in hafnium and titanium. Journal of Engineering Physics 39, 1079–1083 (1980). https://doi.org/10.1007/BF00822138

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  • DOI: https://doi.org/10.1007/BF00822138

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