Diffusion coefficient
Diffusion coefficient
(OP)
hi
i require the diffusion coefficient of carbon in tungsten and tantalum.
Who can help me?
i require the diffusion coefficient of carbon in tungsten and tantalum.
Who can help me?
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RE: Diffusion coefficient
From Tracer diffusion data for metals, alloys, and simple oxides, John Askill, New York, (1970), reprinted in CRC Handbook of Chemistry and Physics, etc.
Measurements for C14 isotope. Ta & W each polycrystalline.
D = Do e-Q/RT
C in Ta: Do = 0.012 cm2/sec, Q = 40.3 kcal/mol, Temp. range 1450-2200oC.
C in W: Do = 0.00891 cm2/sec, Q = 53.5 kcal/mol, Temp. range 1200-1600oC.
Hope this helps,
Ken
RE: Diffusion coefficient