PdCu合金复合膜的制备与评测

Preparation and performance of the PdCu alloy layer

采用化学镀方法在非对称氧化铝管状载体上制备出3μm厚的Pd59Cu41（质量分数，％）合金复合膜．考察了合金膜在473～953K间的氢气渗透性能．在高于873K和低于723K温度区间内，氢气渗透都遵循单一的Arrhenius方程，活化能分别为30．0和9．8kJ／mol．在723～873K温度区间内，氢气渗透量随温度降低而增加的现象说明此时晶体结构为fcc和bcc的混合相，并且晶体结构正逐渐从fcc相向bcc相转变．0．5的压力指数说明在473～873K温度区间内氢气扩散都遵循Sievert’s方程．合金膜的厚度，组成和晶体结构分别用SEM，EDS和XRD进行表征．

The 3 tan PdsgCu41 （mass fraction, % ） alloy membrane was prepared onto the asymmetric alumina tube by electroless plating. The layer thickness, element composition and the phase structure were characterized by SEM, EDS and XRD, respectively. The hydrogen permeance was investigated over 473- 953 K. The hydrogen permences followed a single Arrhenius plot above 873 K and below 723 K, where the activation energies were respectively 30.0 and 9.8 kJ/mol. Over 723-873 K, the hydrogen permeances increased with the decreasing temperature, which indicated the phase structure was the mixed bee/fee phase and the phase was transiting from the fec phase to the bec phase. The 0.5 pressure exponent showed the hydrogen diffusion through the metal was the rate-determining step, which obeyed Sievert＇s equation.