Friction and wear behaviour of beta-silicon nitride-steel couples under unlubricated conditions

resumo

The friction and wear behaviour of colloidally processed and pressureless sintered beta-silicon nitride (Si3N4) ceramics against steel DIN Ck45K under unlubricated condition were investigated using a pin on disk tribometer. beta-silicon nitride (Si3N4) ceramics consolidated by slip casting from suspensions with different solid loading have been studied, aiming at increasing the use of beta-Si3N4 as cutting tools in industrial applications. The morphology of the worn surfaces of beta-silicon nitride ceramics was analysed by scanning electron microscopy (SEM) and energy dispersion spectroscopy (EDS). Under the conditions used, it was found that beta-Si3N4 ceramics exhibited a low wear rate (10(-6) mm(3) N-1 m(-1)) and the frictional behaviour of beta-Si3N4 ceramics-steel couples depended on a metallic layer transferred from the steel disk to the beta-Si3N4 ceramic pin.

palavras-chave

CUTTING-TOOL MATERIAL; MECHANICAL-PROPERTIES; TRIBOLOGICAL BEHAVIOR; STRUCTURAL CERAMICS; SIALON SUSPENSIONS; COMPOSITES; MICROSTRUCTURE; GRAINS; WATER; DRY

categoria

Materials Science; Metallurgy & Metallurgical Engineering

autores

Reis, P; Davim, JP; Xu, X; Ferreira, JMF

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