Resumo

RODRIGUEZ, J.; POZA, P.; MANEIRO, M. A. Garrido  e  RICO, A.. Desgaste de materiales compuestos Al-Li/SiC. C.Tecn. Mat. [online]. 2006, vol.18, n.1-2, pp.43-48. ISSN 0870-8312.

Aluminium matrix composites reinforced with ceramic particles exhibit better properties than the corresponding unreinforced alloys, particularly the wear resistance. This work presents a comparative study of the sliding wear behaviour of an aluminium-lithium (Al-8090) composite material reinforced with silicon carbide particles (15% in vol.) and the unreinforced alloy. The experimental results were obtained from pin on disc tests where the normal load and the temperature were varied. The material without reinforcement behaves better than the composite material under mild wear conditions. Nevertheless, in the severe wear regime (high temperature and high pressure) the composite wear resistance is higher than that of the unreinforced alloy. The particles of the reinforcement stabilize thermally the aluminium-lithium alloy and their mechanical properties remain at higher temperatures. For that reason, the transition temperature from mild to severe wear is higher in the composite material than in the unreinforced alloy.

Palavras-chave : sliding wear; metal - matrix composites; mechanically mixed layers (mml); temperature effect.

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