The permeation of D in various alloys (table 52) was studied by using the gas-phase breakthrough technique at temperatures of between 100 and 500C, and pressures of between 10Pa and 100kPa. It was found that the most permeable alloys were the AISI 430 and AISI 431 stainless steels. The occurrence of D-trapping within the alloys appeared to affect the bulk diffusivity values (table 53).

D.J.Mitchell, E.M.Edge: Journal of Applied Physics, 1985, 57[12], 5226-35

 

 

Table 52

Permeability of D through Various Alloys

 

Alloy

log[Po (mol/s m Pa½)]

E (eV)

AISI 431

-7.95

0.38

AISI 430

-7.38

0.45

AISI 304

-7.30

0.58

Kovar

-7.16

0.59

Ceramvar

-7.04

0.60

Carpenter 49

-6.83

0.62

 

 

 

Table 53

Diffusivity of D in Various Alloys

 

Alloy

log[Do (m2/s)]

E (eV)

AISI 431

-4.29

0.54

AISI 430

-4.77

0.46

AISI 304

-6.94

0.47

Kovar

-6.59

0.45

Ceramvar

-6.29

0.47

Carpenter 49

-6.25

0.46