Using in-house experience with powder metallurgy, SKF has followed two approaches in the development of lightweight rolling elements. Balls have been made from both silicon nitride and a proprietary composite material using process routes based on hot isostatic compaction. The composite material consisted of titanium carbide in a superalloy matrix and the finished balls had densities of 5.4-5.75 g/cc with hardness values above 1500 Hv. The performance of siliocn nitride balls was compared with that of T1 tool steel balls in a test in which two mainshaft bearings were run at progressively increasing loads and speeds. Inspection after testing showed that there was much less distortion of raceway profiles in the bearing with silicon nitride balls indicating better kinematic behaviour. As a consequence, the silicon nitride balls showed little change in physical form, whereas there was marked deterioration of the tool steel balls for the bearing design and test conditions considered. (Puschmann)
Lightweight materials for rolling elements in aircraft bearing
Leichtwerkstoffe fuer die Waelzteile in Flugzeuglagern
1982
10 Seiten, 12 Bilder, 5 Tabellen, 7 Quellen
Conference paper
English
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