C-sphere Strength As An Indicator Of Rolling
Contact Performance Of Silicon Nitride
Author(s)
W. Wang, A. A. Wereszczak & M. Hadfield
Abstract
Silicon nitride material has been used as a bearing material due to its superior
performance against bearing steel. Its successful application as a bearing element
leads to the development of other rolling contact applications in the automotive
industry, especially the engine manufacturing industry. Its excellent rolling
contact performance can make significant savings on warranty costs for engine
manufactures. However, the remaining difficulty for the broader application is
the high component machining cost. Further understanding of the rolling contact
performance of silicon nitride material in relation to its surface integrity will
enable engine manufactures to produce components that meet the design
requirements while at the same time reduce the machining cost. In the present
study, the relationship between the C-sphere strengths of silicon nitride
specimens and their rolling contact fatigue life is investigated. The C-sphere test
is designed to compare the strengths of three batches of Sintered and Reaction-
Bonded Silicon Nitride (SRBSN) specimens with different subsurface quality
induced by varying the machining parameters. The rolling contact fatigue (RCF)
performance of three batches of SRBSN ball specimens are studied on a
modified four ball tester. The results show that the most aggressively machined
specimens have the weakest C-sphere strength and the shortest RCF life. This
positive relationship can give component manufactures a valuable reference
when they make selections of candidate material and finishing standards.
Keywords: ceramics, silicon nitride, flexure strength, rolling contact.
Keywords
ceramics, silicon nitride, flexure strength, rolling contact.
Related Book
Other papers in this volume
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