Abstract
Al–SiC composites containing four different weight percentages 5%, 10%, 20% and 25% of SiC have been fabricated by liquid metallurgy method. Friction and wear characteristics of Al–SiC composites have been investigated under dry sliding conditions and compared with those observed in pure aluminium. Dry sliding wear tests have been carried out using pin-on-disk wear test rate normal loads of 5, 7, 9 and 11 Kgf and at constant sliding velocity of 1.0m/s. Weight loss of samples was measured and the variation of cumulative wear loss with sliding distance has been found to be linear for both pure aluminium and the composites. It was also observed that the wear rate varies linearly with normal load but lower in composites as compared to that in base material. The wear mechanism appears to be oxidative for both pure aluminium and composites under the given conditions of load and sliding velocity as indicated by scanning electron microscope (SEM) of the worn surfaces. Further, it was found from the experimentation that the wear rate decreases linearly with increasing weight fraction of silicon carbide and average coefficient of friction decreases linearly with increasing normal load and weight fraction of SiC. The best results have been obtained at 20% weight fraction of 320 grit size SiC particles for minimum wear.
Highlights
A composite material is a ‘material system’ composed of a combination of two or more micro or macro constituents that differ in form, chemical composition and which are essentially insoluble in each other.The motto to design MMCs is to combine the metals & ceramics i.e. addition of high strength, high modulus refractory particles to ductile metal matrix to get tailor made properties.In the present work, an effort has been made to study wear properties with varying weight fraction of SiC in particle reinforced MMCs developed with the help of two - step mixing method of stir casting technique
Al and decreases with increasing volume fraction of SiC up to 20% as is evident from Fig. 3 and there after for 25% SiC wear loss again increases slightly & reverses the trend of decreasing wear volume loss with increase in SiC weight %
Wear volume loss is maximum for pure aluminium &
Summary
A composite material is a ‘material system’ composed of a combination of two or more micro or macro constituents that differ in form, chemical composition and which are essentially insoluble in each other.The motto to design MMCs is to combine the metals & ceramics i.e. addition of high strength, high modulus refractory particles to ductile metal matrix to get tailor made properties.In the present work, an effort has been made to study wear properties with varying weight fraction of SiC in particle reinforced MMCs developed with the help of two - step mixing method of stir casting technique. A composite material is a ‘material system’ composed of a combination of two or more micro or macro constituents that differ in form, chemical composition and which are essentially insoluble in each other. The motto to design MMCs is to combine the metals & ceramics i.e. addition of high strength, high modulus refractory particles to ductile metal matrix to get tailor made properties. An effort has been made to study wear properties with varying weight fraction of SiC in particle reinforced MMCs developed with the help of two - step mixing method of stir casting technique
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