AVS 47th International Symposium
    Vacuum Technology Wednesday Sessions
       Session VT-WeP

Paper VT-WeP6
Friction Force Measurement of Type 304 Stainless Steel in a High Vacuum

Wednesday, October 4, 2000, 11:00 am, Room Exhibit Hall C & D

Session: Poster Session
Presenter: A. Kasahara, National Research Institute for Metals, Japan
Authors: A. Kasahara, National Research Institute for Metals, Japan
M. Goto, National Research Institute for Metals, Japan
M. Tosa, National Research Institute for Metals, Japan
K. Yoshihara, National Research Institute for Metals, Japan
Correspondent: Click to Email
Vacuum friction measurement system based on Bowden-Leben type system was successfully developed. The system can evaluate sliding friction coefficient under changing load from 0.2N to 0.98mN and at changing atmospheric pressure from 1E+5Pa to 1E-8 Pa. The friction measurement was carried out on typical vacuum materials samples as type 304 austenitic stainless steel sheets after such surface treatments as chemical polishing, mechanical polishing or electrochemical buffing. Chemically polished steel shows the lowest friction coefficient as the decrease of the vacuum pressure and as the decrese of the load due to low desorption of adsobate on the surface. The friction measurement especially under the load less than about 10mN in an atomosheric pressure shows that surface adosobate changed by surface roughness of polished steels could have an large effect on friction force. While, the measurement under the pressure less than 1E-5Pa shows little effect by surface absobate on friction force. The measurement results therefore conclude that Amonton-Coulomb's law is valid in measuring friction force under low load in a high vacuum.