Two-body dry abrasive wear of [Cr.sub.3][C.sub.2]-Ni cermets/ [Cr.sub.3][C.sub.2]-Ni kermiste kuiv abrasiivkulumine

The paper considers two-body dry abrasive wear of a series of chromium carbide base cermets with different amounts of Ni binder (10-50 wt%) using a "block on abrasive grinding wheel" test machine. The wear coefficient of the cermets reduces with the increase of [Cr.sub.3][C.sub.2] content in the composite, which corresponds to an increase in the bulk hardness. The volume wear increases approximately linearly with increasing sliding distance. The wear tracks of the worn blocks after run were analysed using SEM to determine the wear mechanisms. The wear mechanism of [Cr.sub.3][C.sub.2]-Ni cermets depends on the carbide/binder ratio. Material is actually removed by several processes, which include groove formation and the formation of cracks by fatigue under repeated abrasion. Key words: chromium carbide, cermets, two-body abrasive wear. On uuritud [Cr.sub.3][C.sub.2]-Ni kermiste abrasiivkulumist kahe keha meetodil. Kermised on valmistatud tava- ja uudse tehnoloogia--reaktsioonpaagutuse--abil. On naidatud, et sideaine sisalduse kasvades vaheneb kermiste kovadus ja sellest tulenevalt suureneb nende kulumine. Kulumine on vaiksem reaktsioonpaagutuse teel valmistatud kermistel. Kermiste mahuline kulumine kasvab lineaarselt teepikkuse suurenedes. Materjali eemaldumise pohjuseks on vagude tekkimine pinnale ja materjali vasimuslik eemaldumine.