Abstract:Purpose
The purpose of this paper is to evaluate the influence of temperature, load and sliding speed on wear and friction behavior of LM25/SiC composites in as-cast and heat-treated conditions.
Design/methodology/approach
The LM25/SiC aluminum matrix composites (AMCs) were prepared using the stir casting process. The wear tests were carried out using a pin-on-disc setup in dry condition. The three levels of each parameter, i.e. 100, 150 and 200°C operating temperature; 15, 25 and 35 N load; 0.8, 1.6 and 2.4… Show more
“…Figure 2(a) shows the sliding wear behaviour of A356 alloy with and without 0.7%Mg addition under different normal pressures. It is evident that the wear rate (weight loss per unit sliding distance) is dependent on the applied load (normal pressure) and it increases with applied pressure (load) [32][33][34][35][36]. From Figure 2(a) it is clear that, wear rate of A356 alloy increases with an increase in normal pressures in all the cases studied at the tested temperature of 300°C and correlates with Archard's wear law.…”
In this paper, effect of minor additions of magnesium content in the form of master alloys on the high-temperature dry sliding wear behaviour for A356 alloy has been reported. Alloy composition, normal pressures and sliding distances on A356 alloy at constant temperature of 300 °C was studied. The cast alloys and worn surfaces were characterized by SEM/EDX microanalysis. The results indicate that the wear rate of A356 alloy increases with an increase in normal pressures and sliding distances in all the cases and decreases when 0.7% Mg is added to A356 alloy. The decrease in wear rate after the addition of Mg is mainly due to changes in microstructure which lead to improvement in mechanical properties. Further, worn surface study indicates that the formation of iron-rich oxide layer between the mating surfaces during sliding improves sliding wear performance.
“…Figure 2(a) shows the sliding wear behaviour of A356 alloy with and without 0.7%Mg addition under different normal pressures. It is evident that the wear rate (weight loss per unit sliding distance) is dependent on the applied load (normal pressure) and it increases with applied pressure (load) [32][33][34][35][36]. From Figure 2(a) it is clear that, wear rate of A356 alloy increases with an increase in normal pressures in all the cases studied at the tested temperature of 300°C and correlates with Archard's wear law.…”
In this paper, effect of minor additions of magnesium content in the form of master alloys on the high-temperature dry sliding wear behaviour for A356 alloy has been reported. Alloy composition, normal pressures and sliding distances on A356 alloy at constant temperature of 300 °C was studied. The cast alloys and worn surfaces were characterized by SEM/EDX microanalysis. The results indicate that the wear rate of A356 alloy increases with an increase in normal pressures and sliding distances in all the cases and decreases when 0.7% Mg is added to A356 alloy. The decrease in wear rate after the addition of Mg is mainly due to changes in microstructure which lead to improvement in mechanical properties. Further, worn surface study indicates that the formation of iron-rich oxide layer between the mating surfaces during sliding improves sliding wear performance.
“…At higher testing temperatures, the Al10G composite yields minimum wear loss. For graphite-reinforced composites, the effects of solid lubricant and wear protective layer comes into play, which reduced the wear from the composite materials [29]. Also, as the sliding between the composite material and hardened ball started, the material from the composite material starts shearing off by the asperities of balls.…”
The present work discusses the wear and friction studies of aluminium graphite fly ash composite. Three aluminium composites, Al with 10 wt. % fly ash, Al with 10 wt. % graphite, and Al with 5 wt. % fly ash & 5 wt. % graphite were fabricated using the stir casting technique. A linear reciprocating tribometer was used to evaluate the wear and frictional behavior at two distinctive temperatures of 36 °C and 100 °C in dry and lubricated conditions. The aluminium with 10 wt. % fly ash resulted in the least amount of mass loss and coefficient of friction in dry as well as a lubricated condition at 36 °C, however, at a higher temperature of 100 °C the aluminium with 10% graphite exhibits the lowest mass loss and coefficient of friction value. It is concluded that for dry sliding conditions, aluminium fly ash composite could be used as a potential material for applications that are to be operated at room temperature and for high-temperature applications aluminium graphite composite is more suitable.
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