Abstract
Oxygen is shown to be a factor in the wear of silicon nitride against cast iron and steel. Pin-on-disk tests show that the wear of silicon nitride against cast iron and steel is reduced when the oxygen concentration of the atmosphere is reduced. A relationship between pin-on-disk and machining tests is shown. Machining data are presented to indicate how the wear of the silicon nitride tool is reduced when the oxygen concentration at the toolworkpiece interface is reduced with a stream of nitrogen.
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