Chemical pumping in vacuum technology

Hydrogen Sorption Property of Zr<SUB>55</SUB>V<SUB>29</SUB>Fe<SUB>16</SUB> Nanopowder Synthesized by the Plasma Arc Discharge Process

“…10,22) Thus, the formation of the mixed-phase structure of the zirconium solid solution and intermetallic compound is very important for preparing the zirconiumbased getter. The synthesized Zr 55 V 29 Fe 16 powder by the plasma arc discharge process in this study has a mixed-phase structure of the Zr, ZrH 2 , FeV and Zr(V 1-x Fe x ) 2 phases as shown in Fig.…”

“…Generally, the conventionally prepared Zr-V-Fe-based getter material, Zr 57 V 36 Fe 7 , has a mixed phase structure of -Zr and Zr(V 1-x Fe x ) 2 phases. 10,22) The Zr(V 1-x Fe x ) 2 phase was formed by the addition of Fe to ZrV 2 . For the application of the Zr-V-Fe-based alloys as a getter in vacuum technology, a high gas sorption property and a low activation temperature are needed.…”

“…Activation of the getter creates a fresh getter surface ready to react with the active gases usually present in vacuum devices (H 2 , H 2 O, CO, CO 2 , N 2 and O 2 ). 10) In the case of Zr-V-Fe-based getters, the activation is carried out by properly heating the getter material and promoting the bulk diffusion of oxygen of the passivated surface layer until the surface is sufficiently clean to begin sorbing the active gases. The activation process is not only related to the temperature but also to time, even though it is more strongly dependent on the temperature, as is to be expected for the diffusion mechanism.…”

“…[5][6][7][8] Zirconium-based alloy powders are of particular interest for hydrogen storage and ''get'' the active gases in vacuum technology, i.e.,''getters''. [10][11][12][13] The zirconium-based alloy powders for hydrogen storage and getters have multi-element systems, for example, Zr-V-Fe, Zr-Ti-V, Zr-Al-Ni, etc. Generally, these powders have been made by the hydridedehydride method, i.e., a combination of casting, hydrogenation-dehydrogenation and mechanical grinding processes.…”

The Newest Getter Technologies: Materials, Processes, Equipment

“…These new gas sorbents do not need heating or cooling; they are more economical to use in production, more convenient in their operation and much more effective in sorption. These new materials outperform the current getter materials by orders of magnitude in sorption capacity [1] [2].…”