Tribological behaviour of colloidally processed sialon ceramics sliding against steel under dry conditions

resumo

Advanced structural ceramics are presently used in several tribological applications such as precision instrument bearings, water pumps, automotive engine parts and cutting tools inserts. In the present work, the tribological behaviours of colloidally processed and pressureless sintered sialon ceramics with different phases (alpha and beta) have been studied, aiming at increasing the industrial applications of sialon ceramics. The friction and wear behaviour of sialon ceramics against steel DIN-Ck45K were investigated using a pin-on-disk tribometer under dry conditions. Scanning electron microscopy (SEM), and energy dispersion spectroscopy (EDS) were used to analyse the worn surfaces of the sialon ceramics. Under the conditions used, sialon ceramics exhibited a typical mild wear (10(-6) mm(3) N-1 m(-1)) and the dominant wear mechanisms present were adhesive and abrasion. The results confirmed that colloidal processing and pressureless sintering are effective methods to prepare wear resistant sialon ceramic components.

palavras-chave

CUTTING-TOOL MATERIAL; MECHANICAL-PROPERTIES; WEAR BEHAVIOR; MICROSTRUCTURE; FRICTION; COMPOSITES; ADDITIVES; POLYOLS; (CA

categoria

Engineering

autores

Reis, P; Davim, J; Xu, X; Ferreira, J

nossos autores

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