3107. Fabrication of high-strength unsupported metal membranes

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 263 KB
• Volume: 27
• Category: Article
• ISSN: 0042-207X
• DOI: 10.1016/s0042-207x(77)80573-3

✦ Synopsis

modified orbitron pump by using the two-gauge calibrated conductance method for helium, argon, and xenon with the temperatures of the pump body at 288 K (lYC), 323 K (50 C), and 418 K (145 C). Improvemcnts in the maximum speed in comparison with the conventional orbitron pump are by factors varying from 1.15 to 1.88. Increase in speed for helium with pressure is attribt, ted to the concentration of helium atoms at some trapping sites in titanium films. Increase in speed for helium at 323 K (50 C) temperature indicates that the pumping of helium is governed by a diffusioncontrolled process before the entrapment. Deterioration in the speeds for argon and xenon at 323 K (50:C) and for helium at 418 K (145~C) is believed to be due to thermal release of the trapped gas. (India)