Die Gasdurchlässigkeit von Vakuummaterialien

This work presents investigations on the gas permeability of materials for use in unmanned space vehicles. The measurement system for determining the gas permeation coefficients of composite materials is designed on the basis of a helium leak detector. Due to permeation through the Vi-ton sealing the smallest flow that can be correctly measured by the system is 10^?10 Pa · m³/s. The system was assessed with a PTFE polymer sample with a known helium permeability value. Furthermore, the gas perme-abilities of three composite materials were studied. The steady-state helium permeation coefficient in Pa · m³/s] · m/(m² · bar)] for high molecular weight polyethylene (HM-WPE) with 100 nm copper coating is 3.1 · 10^?8, for high density polyethy lene (HDPE 209-07) with 100 nm copper coating it is 1.9 · 10^?7; for vacuum-tight ceramics VK94-1 with glue K400 layer it is 2.2 · 10^?9. Authors will be glad to measure the gas permeability of new materials that can be provided by readers of this publication.