本研究利用電泳(EPD)及無電鍍(EP)技術製備鈀銀合金/多孔不銹鋼(PdAg Alloy/PSS)複合膜，並探討複合膜之微結構及熱處理條件對於氫、氮氣體透過之影響。
　　首先，在修飾過之多孔不鏽鋼基材上直接電泳沈積鈀銀層，形成EPD PdAg/PSS複合膜，電泳時在外加定電壓50V下，鍍覆10分鐘，可得一厚度約5μm之鈀銀膜層;再經過10%氫氮混合氣氛、400℃下鍛燒3小時後，可得鈀銀合金相。另外，由氣體透過結果可知，在上游壓力為40~180kPa，氣體透過溫度為300℃時，此複合膜之氫/氮選擇率在3.21-3.45間，顯示鈀銀合金膜層有針孔(pinhole)存在，故氫氣透過複合膜之機制仍以Knudsen擴散和黏性流動(viscous flow)為主。
其次，以電泳法取代傳統敏化活化程序來鍍覆鈀活化層(約0.1μm)，再利用無電鍍法逐次鍍覆鈀、銀層，形成EP PdAg/ EPD Pd/PSS複合膜，並經10%氫氮混合氣氛、500℃下鍛燒24小時，以使鈀銀膜層形成合金相。實驗結果發現，表面鈀銀膜層仍有針孔(pin-hole)存在，其氫/氮選擇率大抵在3.15-3.84之間，與前述直接電泳鈀銀層之EPD PdAg/PSS複合膜相當。由此推論，電泳活化層之鈀晶粒雖降至奈米尺寸，但並未能明顯提高後續鈀銀膜層之緻密性，其原因帶進一步探討。

　　In this study, palladium-silver alloy/ porous stainless steel (PdAg alloy/PSS) composite membranes were prepared by electrophoretic deposition (EPD) and electroless plating (EP). The influences of microstructure and heat treatment of the prepared membranes were investigated.
At first, the EPD PdAg/PSS composite membrane was obtained by electrophoretically depositing PdAg layer onto the modified PSS substrate. At bias of 50 V for 10 minutes, a PdAg layer was formed with a thickness of 5μm, which was then annealed to become PdAg alloy layer at 400oC for 3 hours in a 10% H2/N2 atmosphere. Furthermore, H2/N2 permselectivities of the composite membranes were in the range of 3.21-3.45 at 300oC and upstream pressures of 40-180 kPa. However, the existence of many pinholes in the PdAg layer causes the permeation of gases by Knudsen diffusion and Poiseuille flow, leading to the low H2/N2 permselectivity.
　　Alternatively, instead of conventional sensitization-activation process, the EPD technique was employed to deposit an activation layer of Pd onto the modified PSS substrate. Then, the PdAg layer was deposited by the sequential EP technique to obtain the EP PdAg/EPD Pd/PSS composite membrane. Similarily, a PdAg alloy layer was formed after annealng the membrane at 500oC in a 10% H2/N2 atmosphere for 24 hours. The experimental result showed that the H2/N2 permselectivities were almost in the range of 3.15-3.84 with the fact of many voids left in the surface of PdAg alloy layer. This result was very close to that obtained from the EPD PdAg/PSS composite membrane. Eventually, the Pd grain of the activated EPD Pd layer was reduced to the size of nanometer, the denseness of the following deposited PdAg layer could not be obviously increased. The true reason needs to be investigated in advance.

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