Abstract
When designing the composition and structure of a composite material intended for tribological cooperation, many external and structural factors must be considered. The aim of this research was to compare the tribological properties (wear resistance and friction coefficient) of AlSi7Mg1Sr0.03/SiCp and AlSi7Mg1Sr0.03/GCsf single-reinforced composite layers with AlSi7Mg1Sr0.03/SiCp + GCsf hybrid composite layer formed in sleeves via vertical centrifugal casting. Profilometry enabled quantitative and qualitative analyses to be performed on the wear traces formed on investigated surfaces. The results show that a hybrid composite layer containing spherical glassy carbon particles had a significantly lower and more stable coefficient of friction (μ) and a higher wear resistance compared with single composite layers. The obtained effect was related to the mechanism of vitreous carbon consumption, which was crushed during operation, and then introduced between the cooperating friction surfaces. In this way, it acted as a solid lubricant, which stabilized the coefficient of friction and reduced the wear process.
Highlights
The largest group of metal matrix composites (MMCs) are based on aluminum-silicon alloy matrixes (AlMCs), mainly due to their favorable prices and properties, their low density (~2.7 g/cm3 ), high strength/weight ratio, corrosion resistance, and their ability to be formed and treated.the introduction of various ceramic components into aluminum alloys allows their properties to be tailored to a wide range of engineering applications [1]
Our research focuses on the possibility of using glassy carbon (GCp ) as an alternative lubricant to graphite particles (GRp )
The aim of this research was to compare the tribological properties of AlSi7Mg1Sr0.03/SiCp and AlSi7Mg1Sr0.03/GCsf single-reinforced composite sleeves with AlSi7Mg1Sr0.03/SiCp + GCsf hybrid composite obtained via vertical centrifugal casting at speed of 3000 rpm
Summary
The largest group of metal matrix composites (MMCs) are based on aluminum-silicon alloy matrixes (AlMCs), mainly due to their favorable prices and properties, their low density (~2.7 g/cm3 ), high strength/weight ratio, corrosion resistance, and their ability to be formed and treated.the introduction of various ceramic components into aluminum alloys allows their properties to be tailored to a wide range of engineering applications [1]. The introduction of hard Al2 O3 or SiC ceramic phases to an AlSi alloy allows the production of materials with enhanced wear resistance under friction [2,3,4,5,6,7]. The use of different dispersed phases (i.e., TiC, SiC, Al2 O3 , or intermetallic phases) increases the yield point and creep resistance, making it possible to use materials at elevated temperatures [10,11,12]. Sajjadi et al [13] and many others have reported improvements in strength and wear resistance by reducing the reinforcement size from the micro to the nano scale [14,15,16]
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