Wear mechanism of silicon nitride in rolling-sliding contact

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Abstract

The microscopic wear mechanism of silicon nitride in unlubricated rolling-sliding contact was investigated by using a ring on ring test machine at room temperature. The tangential coefficient φ was changed from 0.04 to 0.89 and the slip ratio S was changed from 0% to 100% by changing the combination of contact stress and shear stress. With these conditions, the value of wear coefficient K obtained was on the order of 10-7 -10-3. The wear coefficient increased with increasing tangential coefficient and increasing slip ratio. The observed drastic change of wear coefficient related closely to the change of microscopic wear mode which was evident by the inspection of the wear surface with an SEM. When S>10%, the wear surface became very rough and showed many cracks and marks of deramination of flakes, and K was larger than 10-5. When S<10% and φ >0.3, wear surface showed partial fracture on a scale similar to the pore size, and K was 10-6 order. When S<10% and φ <0.3, wear surface remained initial pores clearly and crack was not observed, and K was less than 10-6.

Original languageEnglish
Pages (from-to)333-338
Number of pages6
JournalWear of Materials: International Conference on Wear of Materials
Volume1
Publication statusPublished - 1991 Jan 1
EventInternational Conference on Wear of Materials - Orlando, FL, USA
Duration: 1991 Apr 71991 Apr 11

ASJC Scopus subject areas

  • Mechanics of Materials

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