کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5468433 | 1518934 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A numerical solution of density distribution function of water adsorption sites on vacuum technical metal surfaces
ترجمه فارسی عنوان
یک راه حل عددی از تابع توزیع تراکم از سایت های جذب آب در سطوح فلزات فنی خلاء
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
چکیده انگلیسی
During the pump-down process of technical metal vacuum systems without bakeout after air exposure, water makes up most of the desorbed gas in a short term. The desorbed water comes from the near-surface regions (inside the oxide layers and their surfaces) of the vacuum metal materials. If the thickness of the oxide layer is very small, and the surface is smooth, then the outgassing will be dominated by the mechanism of adsorption and desorption of water on the surface, and the molecular diffusion inside the oxide layer could be negligible. In some previous works, different isotherms were used to predict the pump-down curves, and to understand the mechanism of adsorption and desorption of water on the surfaces. The theoretical results with adjusted parameters often agreed well with the experimental phenomena. However, using these isotherms with known distributions to express the unknown densities of adsorption sites with different binding energies is an a priori method. In the present work, a numerical method is proposed to obtain a solution of density function of surface adsorption sites from the experimental data of pump-down reported by Edwards [J. Vac. Sci. Technol. 14, 606 (1977)].
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 136, February 2017, Pages 14-19
Journal: Vacuum - Volume 136, February 2017, Pages 14-19
نویسندگان
Detian Li, Yongjun Cheng, Yanwu Li, Lan Zhao, Wenjun Sun, Yongjun Wang,