Tribological behaviour of SiC particulate reinforced aluminium alloy composites in unlubricated sliding against cast iron

• Autorzy: Gomes J. R. , Miranda A. S. , Rocha L. A. , Crnkovic S. J. , Silva V. , Silva R. F.
• Języki publikacji: EN

Abstrakty

EN

Functionally graded metal matrix composites (FGMMCs) are novel materials attractive for aircraft and automotive tribological components. A superior combination of surface and bulk mechanical properties may be pointed as one of the main advantages of this new material concept. In particular, through an adequate control of the ceramic particles distribution from the surface down to the core of the component, the wear resistance may be improved at the surface while global toughness is preserved. In this work, the tribological behaviour of a Al-9%Si alloy reinforced with SiC particles processed by gravity and centrifugal casting is compared. Wear tests were performed using the pin-on-disc configuration, the composite being the disc while pins were built in cast iron. Sliding speed (0.5-1.5ms-1) and disc temperature (22-300oC) were the main variables considered in the tests. Results suggest that formation of adherent iron-rich tribolayers in tests carried-out at room temperature is the main mechanism leading to an improvement of the wear resistance. For v=0.5ms-1 , this effect is enhanced in the material obtained by centrifugal casting in which the surface area fraction of particles is higher. Temperature (externally applied or due to frictional heating) degrades the tribological performance of the reinforced materials, promoting transfer of aluminium from the disc to the cast iron counterface.

Słowa kluczowe

EN

metal matrix composites; functionally graded materials; Al-SiC composites; cast iron; tribolayer

PL

materiałoznawstwo; kompozyty; żeliwo

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2002
• Tom: Vol. 7, no 3
• Strony: 791--802
• Opis fizyczny: Bibliogr. 7 poz., tab., wykr.

Twórcy

autor

Gomes J. R.

• Department of Mechanical Engineering, University of Minho, Campus de Azurém, P4800-058 Guimaraes, PORTUGAL

autor

Miranda A. S.

• Department of Mechanical Engineering, University of Minho, Campus de Azurém, P4800-058 Guimaraes, PORTUGAL

autor

Rocha L. A.

• Department of Mechanical Engineering, University of Minho, Campus de Azurém, P4800-058 Guimaraes, PORTUGAL

autor

Crnkovic S. J.

• Department of Materials and Technology, UNESP, Campus de Guaratingueta 12500000, Sao Paulo, BRAZIL

autor

Silva V.

• Department of Ceramics and Glass Engineering, UIMC University of Aveiro, P-3810-193 Aveiro, PORTUGAL

autor

Silva R. F.

• Department of Ceramics and Glass Engineering, UIMC University of Aveiro, P-3810-193 Aveiro, PORTUGAL

Bibliografia

• [1] Gomes J.R., Miranda A.S., Soares D., Dias A.E., Rocha L.A., Crnkovic S.J. and Silva R.F. (2001): Tribological Characterization of Al-Si/SiCp Composites: MMC’s vs. FGMys. - American Ceramic Society Transactions (accepted).
• [2] Ravikiran A. and Surappa M.K. (1997): Effect of sliding speed on wear behaviour of A356 Al-30 wt.% SiCp MMC. - Wear, vol.206, pp.33-38.
• [3] Ruhle M. (1996): Structure and composition of metal/ceramic interfaces. - J. Euro. Ceram. Soc., vol.16, pp.353-365.
• [4] Sannino A.P. and Rack H.J. (1995): Dry sliding wear of discontinuously reinforced aluminium composites: review and discussion. - Wear, vol.189, pp.1-19.
• [5] Suresh S. and Mortensen A. (1998): Fundamentals of Functionally Graded Materials. - IOM Communications Ltd., UK.
• [6] Venkataraman B. and Sundararajan G. (1996): The sliding wear behaviour of Al-SiC particulate composites-II. The characterization of subsurface deformation and correlation with wear behaviour. - Acta Mater., vol.44, No.2, pp.461-473.
• [7] Wilson S. and Alpas A.T (1996): Effect of temperature on the sliding wear performance of Al alloys and Al matrix composites. - Wear, vol.196, pp.270-278.