球-平板接触下における窒化けい素の微小表面き裂進展挙動と摩耗挙動の観察

概要

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Crack growth behavior from pre-indentations and wear behavior in Si_3N_4 ceramics were investigated under ball-on-plate contact. Contact fatigue tests were carried out with the use of a newly developed apparatus under three contact conditions : sliding contact, sliding-including-rolling contact and rolling contact. A friction coefficient was monitored during the tests. It was found that the failure was strongly affected by the friction coefficient. The contact fatigue failure was dominated by the wear, for a higher friction coefficient above a threshold value of 0.13,while the failure was dominated by a crack growth than the wear for a lower friction coefficient than the threshold value. The crack growth behavior was observed under rolling contact and sliding-including-rolling contact. In the center of the contact area, the crack was found to grow only in a perpendicular direction to the motion of the ball. In the border of the contact area, on the other hand, the cracks were found to grow both in the parallel direction and in the perpendicular direction. The crack growth was accelerated by an increased friction force under rolling-including-sliding contact.
1999-04-25