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4050336 
Journal Article 
Mechanically stimulated outgassing from ball bearings in vacuum 
Peressadko, AG; Nevshupa, RA; Deulin, EA 
2002 
1 
Vacuum
ISSN: 0042-207X 
Elsevier 
64 
3-4 
451-456 
WOS:000173202300041 
This study investigates the outgassing of bare stainless steel and MoS2 coated ball bearings, both of which are widely used in modern high vacuum technological equipment. Three well-distinguished stages of outgassing are observed as a function of time, which correspond to different phases of a ball bearing's lifetime. For both type of bearings, hydrogen, carbon oxide and methane were the main outgassing species. Two main processes govern the outgassing from a ball bearing: (i) local heating of the contact surfaces and (ii) plastic deformation and fracture of counterfaces. Outgassing from a ball bearing is very sensitive to damage of the contacting surfaces and demonstrates a good correlation with dissipative parameters, such as self-resistant torque and vibration. The mean outgassing rate is highly sensitive to the average dissipation energy, whereas the oscillation of the outgassing signal around the mean value is dependent upon the formation of new defects on counterfaces. (C) 2002 Elsevier Science Ltd. All rights reserved. 
vacuum; ball bearing; outgassing; molybdenum disulphide; stainless steel; wear