Mechanically stimulated outgassing from ball bearings in vacuum
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...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2002 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/346552 |
| Acceso en línea: | http://hdl.handle.net/10261/346552 |
| Access Level: | acceso abierto |
| Palabra clave: | Vacuum Ball bearing Outgassing Molybdenum disulphide Stainless steel Wear |
| Sumario: | 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. |
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