کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8044445 | 1518919 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydrogen pumping with a hot martensitic steel membrane
ترجمه فارسی عنوان
پمپاژ هیدروژن با یک غشای فولاد گرم مارتنزیتی
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
چکیده انگلیسی
Long-term maintenance of low pressure in vacuum thermal insulating devices is a difficult task. Even in completely tight metal envelopes, gas accumulation, due to outgassing of applied materials, represents the main problem. Among gases which are dissolved in constructional metals, hydrogen is the most harmful one, but it is also the only gas species that might permeate to the atmosphere. We present experimental work where a heated metal membrane made of martensitic steel, termed Eurofer, was studied as a selective hydrogen pump. It was built as an extended part of a tight UHV vacuum chamber. Initial hydrogen pressure was set in a wide range from 1.5â¯bar to 1â¯Ãâ¯10â3â¯mbarâ¯at temperatures from 100â¯Â°C to 400â¯Â°C. The observed hydrogen permeation flow was expressed as the specific pumping speed SA. At the initial pressure p0â¯=â¯1â¯mbar it was, SA (400â¯Â°C)â¯=â¯1.6â¯Ãâ¯10â6â¯Lâ¯sâ1â¯cmâ2. At low pressures, this attractive pump performance was overwhelmed by background outgassing of CO and CO2. At temperatures lower than 200â¯Â°C, the outgassing rate of CO and CO2 was not detectable over the first 20â¯h and pumping due to hydrogen permeation continued into the 10â4â¯mbar pressure range.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 151, May 2018, Pages 1-7
Journal: Vacuum - Volume 151, May 2018, Pages 1-7
نویسندگان
Vincenc NemaniÄ, Marko Žumer,