This work highlights new research into the fundamental properties of palladium-gold alloy membranes. Two types of self-supported palladium-gold foils were studied; membranes produced by magnetron sputtering and membranes produced by cold-working. The cold-worked membranes had thicknesses of 25 microns and gold contents from 0–40 wt% Au, while the sputtered films ranged from 10–31 microns in thickness and 5–10 wt% Au. These films were characterized by single-gas permeation testing in the temperature range of 473–773K and at pressures of up to 772 kPa. Membranes were studied before and after testing by XRD, XPS, XRF, and SEM/EDS.Hydrogen permeability in the 0–20 wt Au% range was found to be a function of synthesis technique as much as alloy content, with no single alloy having superior permeability at all temperatures. Sputtered materials had generally higher permeability than cold-worked materials of equivalent composition, although the thicker sputtered membrane had reduced hydrogen permeability compared to its thinner counterparts. In this composition range, the addition of gold generally acted to reduce activation energy of hydrogen permeation. The differences in membrane permeability by fabrication technique are primarily attributed to preferential orientation effects. These effects also appear to contribute to other permeation phenomena, such as low-temperature hydrogen embrittlement, the dependence of flux on feed pressure, and the formation of long range ordered surface phases.

中文翻译：

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制备工艺对钯金合金氢分离膜材料性能和渗透特性的影响

这项工作突出了对钯金合金膜基本特性的新研究。研究了两种类型的自支撑钯金箔；磁控溅射生产的膜和冷加工生产的膜。冷加工膜的厚度为 25 微米，金含量为 0-40 wt% Au，而溅射膜的厚度为 10-31 微米，金含量为 5-10 wt%。这些薄膜的特点是在 473-773K 的温度范围内和高达 772 kPa 的压力下进行单一气体渗透测试。在通过 XRD、XPS、XRF 和 SEM/EDS 测试前后对膜进行了研究。发现 0-20 wt% Au% 范围内的氢渗透率与合成技术和合金含量有关，没有单一合金具有在所有温度下均具有优异的渗透性。溅射材料通常比同等成分的冷加工材料具有更高的渗透性，尽管与较薄的对应物相比，较厚的溅射膜具有降低的氢渗透性。在这个组成范围内，金的加入通常起到降低氢渗透活化能的作用。制造技术的膜渗透性差异主要归因于优先取向效应。这些影响似乎也有助于其他渗透现象，例如低温氢脆、通量对进料压力的依赖性以及长程有序表面相的形成。尽管与较薄的对应物相比，较厚的溅射膜降低了氢渗透性。在这个组成范围内，金的加入通常起到降低氢渗透活化能的作用。制造技术的膜渗透性差异主要归因于优先取向效应。这些影响似乎也有助于其他渗透现象，例如低温氢脆、通量对进料压力的依赖性以及长程有序表面相的形成。尽管与较薄的对应物相比，较厚的溅射膜降低了氢渗透性。在这个组成范围内，金的加入通常起到降低氢渗透活化能的作用。制造技术的膜渗透性差异主要归因于优先取向效应。这些影响似乎也有助于其他渗透现象，例如低温氢脆、通量对进料压力的依赖性以及长程有序表面相的形成。