Berlin 2005 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
VA: Vakuumphysik und Vakuumtechnik
VA 4: Vakuumverfahren und Komponenten 2
VA 4.3: Talk
Monday, March 7, 2005, 16:25–16:45, TU E20
Study of adhesive features and adhesive wear of challenging materials for sealing elements of Ultra High Vacuum valves — •Mikhail Kosinsky1,2, Wolfram Hild1, Eugeniy A. Deulin2, and Juergen A. Schaefer1 — 1TU Ilmenau, Institut für Physik und ZMN, Postfach 100565, 98694 Ilmenau, Germany — 2BMSTU, MT-11, 2nd Baumanskaya 5, 105005 Moscow, Russia
One of the main problems of designing reliable vacuum valves, which are capable to stand heating up to 450∘C, implies an appropriate selection of materials for the mating surfaces, i.e. a sealing plate and a valve seat, to provide low adhesion and wear of the contacting surfaces.
The main purpose of this work is to study the adhesive features and adhesive wear of pairs of challenging materials for the development of reliable ultra high vacuum seals, such as SiO2, Al2O3, Cu, stainless steel and others.
Investigations were carried out for a sphere-on-flat contact pair in atmospheric pres-sure and in vacuum. The adhesion force was estimated by static friction of various friction pairs during their mutual movement. The dependences of the static friction force on various parameters, such as normal load, temperature, and relative humidity, were obtained. These investigations permit us to lay the basis for further study and development of reliable ultra high vacuum seals.