氢在石墨中的溶解扩散及渗透过程研究

HYDROGEN SOLUTION AND DIFFUSION IN GRAPHITE

通过对在不同氢气氛下预先气相充氢的石墨试样出氢规律的研究，得到氢在石墨中的溶解扩散及渗透过程的热力学参数如下：Ｄ＝５．７７×１０￣（－８）ｅｘｐ（－１８０００／ＲＴ）Ｓ＝２．２×１０￣（－９）ｅｘｐ（－５５００／ＲＴ）φ＝１．３×１０￣（－１６）ｅｘｐ（－２３５００／ＲＴ）其中Ｄ为扩散系数，单位ｍ￣２·ｓ￣（－１）；Ｓ为溶解度，单位；φ＝Ｄ·Ｓ，为渗透率，单位ｍ￣２·ｓ￣（－１）·Ｐａ；Ｔ为温度（Ｋ）；Ｒ＝８．３１为气体普适常数。

In order to study the solution and diffusion of hydrogen in graphite,a vacuum heating de-gassing measurement has been carried out in temperature range 550-1100K on a set of specimenspreviously hydrogen-charged under a pressure of 10￣5 Pa in temperature range 600-1300K.Thedetermined solution(S)and diffusion coefficients(D)are S=2.2 × 10￣(-9)exp(-5500/RT),Pa￣(-1/2),D=5.77× 10￣(-8)exp(-18000/RT),m￣2/s respectively.And the permeability deter-mined by the relation of φ=DS is φ=1.3× 10￣(-16)exp(-23500/RT),m￣2/s Pa￣(-1/2) where T is inK and R=8.31 J/mole.