【摘要】 采用无电化学镀技术制备了Pd-Cu合金复合薄膜。复合膜的初始基体是0.2μm等级的316L多孔不锈钢圆片(PSS),经过改性的(含Pd)溶胶-凝胶ZrO2成膜技术对PSS表面进行了修饰。修饰后的PSS表面首先进行无电镀金属Pd膜,然后在Pd膜表面再镀金属Cu膜。最后把具有双金属镀层的膜片在773 K,H2气氛(101kPa)下保持5~10h进行退火热处理,通过金属间分子热扩散把不锈钢基体上的金属Pd膜和金属Cu膜合金化为均匀的Pd-Cu合金复合薄膜。XPS确定表面组成为Pd90Cu10(质量分数/%)合金薄膜,经过XRD分析结合确定为单相无序fcc结构;而Pd59Cu41合金膜是由平衡fcc相和有序bcc相组成。通过SEM观察到Pd90Cu10合金薄膜(厚度5μm)表面存在一些针孔;而Pd59Cu41合金膜(厚度10μm)没有针孔存在,这种合金复合膜应该具有极高的透H2选择性。更多还原

【Abstract】 Thin Pd-Cu/ZrO₂-PSS composite membranes were prepared by modified electroless plating technique on 0.2 μm graded 316L porous stainless steel（PSS） disks.After the surface of PSS was modified by Pd-doped zirconia,the zirconia side of the modified support was successively coated with palladium and copper by electroless plating.Finally,the as-deposited Pd-Cu/ZrO₂-PSS composite membrane was annealed in hydrogen at 773K for 5～10h in order to form a homogeneous palladium-copper alloy film by thermal diffusion.XPS analyses showed the average surface composition of the two membranes were respectively Pd₉₀Cu₁₀ and Pd₅₉Cu₄₁（mass fraction/%）.XRD analyses indicated that deposited Pd₉₀Cu₁₀ alloy film contained only fcc（face-centred cubic） phase structure whereas Pd₅₉Cu₄₁ alloy film contained a mixture of fcc and bcc（body-centred cubic phase）.Surface micrographs made by SEM showed the presence of some visible pin-holes on the 5μm thick Pd-Cu/ZrO₂-PSS membrane, and pinhole free surface for the 10μm one which should possess an excellent perm-selectivity for hydrogen.更多还原