This paper shall present a survey on a vacuum or space related effect, which is referred to as "cold welding", "adhesion" or "sticking". It refers to "welding or sticking" of contacting bodies which shall open vertically (no sliding), i.e. ace. to ECSS "separable contact surfaces". Starting from a reported failure on a spacecraft, test facilities were developed and a verification study was done to show relevance between the test results and the reported failure. In the following, a standardised test method was set-up, in order to compare different space relevant materials and coatings for their tendency to cold welding. Within several studies, common experience and numerical results were gained on space relevant combinations of materials and coatings. Based on this knowledge, recommendations for use of certain combinations will be drawn. Adhesion forces under fretting were found to exceed the loading forces. As example, nickel containing stainless steels shall be avoided. An assessment of coatings for steels and Aluminium (e.g. hard anodising, Keronite) is given.
Influence of coatings and alloying on cold welding due to impact and fretting
2003
8 Seiten, 13 Quellen
Aufsatz (Konferenz)
Englisch
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