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Reciprocating ball-on-flat tests were conducted on prepared sections cut from cast iron, silicon nitride, and silicon nitride/12.5 vol% graphite composite valve guides over a range of temperatures, normal loads, speeds, and lubrication conditions. The purpose of this work was to ascertain whether the latter ceramic composite would produce a beneficial lubricating film on the opposing surface and serve...
This study addresses the influence of grinding-induced roughness, subsurface damage and residual stress on the repeated impact behavior of silicon nitride, a leading material for diesel poppet-valves. A ball-on-flat repeated impact tester was used to evaluate the impact wear of GS-44 silicon nitride coupons machined in three different conditions: coarsely ground (with 80-grit wheel), finely ground...
The relationship between two significantly different surface grinding conditions and the reciprocating ball-on-flat friction and wear behavior of a high-quality, structural silicon nitride material (GS-44) was investigated. The slider materials were silicon nitride NBD 200 and 440C stainless steel. Two machining conditions were selected based on extensive machining and flexural strength test data...
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