“…These findings indicated that h-BN reinforcement acted as a lubricant between the A 2 O 3 ball and the surface during dry sliding wear. In a similar study, it was observed that SiC and graphite reinforcement improved the wear properties of ZA27 hybrid composites and reduced the specific wear rate [12].…”
Section: Average Frictional Coefficient and Wear Ratementioning
confidence: 73%
“…Miloradovic et al studied the wear behavior of hybrid composites reinforced by the addition of SiC and graphite to the ZA27 matrix material in a dry friction environment. They found that the additive of SiC and graphite significantly improved the abrasion resistance of the composites [12]. Surya and Prasanthi et al examined the tribological properties of Al7075 and SiC composites produced by the powder metallurgy method in the pin-on-disc wear mechanism.…”
Within the scope of this study, silicon carbide (SiC) and hexagonal boron nitride (h-BN) powders were added as reinforcement into zinc-aluminum (ZA40) matrix powders, and the powder metallurgy (PM) method, which is an advanced technique in material production, was used to fabricate ZA40/SiC/h-BN hybrid composites. In the milling process, the asreceived powders were mechanically milled at 400 rpm under a protective argon atmosphere for 2 h at room temperature. The hybrid composite powders were consolidated under 700 MPa pressure at 515 • C for 3 h by hot pressing. Weight losses, friction coefficients, and wear rates were calculated by traveling 100 and 200 m at 250 rpm in a ball-on-disc abrasion test setup under 5 and 10 N loads. According to the results, it was seen that SiC and increased h-BN reinforcement changed the mechanical and physical properties of the composites and made significant contributions to the wear resistance and load-carrying capacity. K e y w o r d s : ZA40, silicon carbide, boron nitride, wear, hot pressing
“…These findings indicated that h-BN reinforcement acted as a lubricant between the A 2 O 3 ball and the surface during dry sliding wear. In a similar study, it was observed that SiC and graphite reinforcement improved the wear properties of ZA27 hybrid composites and reduced the specific wear rate [12].…”
Section: Average Frictional Coefficient and Wear Ratementioning
confidence: 73%
“…Miloradovic et al studied the wear behavior of hybrid composites reinforced by the addition of SiC and graphite to the ZA27 matrix material in a dry friction environment. They found that the additive of SiC and graphite significantly improved the abrasion resistance of the composites [12]. Surya and Prasanthi et al examined the tribological properties of Al7075 and SiC composites produced by the powder metallurgy method in the pin-on-disc wear mechanism.…”
Within the scope of this study, silicon carbide (SiC) and hexagonal boron nitride (h-BN) powders were added as reinforcement into zinc-aluminum (ZA40) matrix powders, and the powder metallurgy (PM) method, which is an advanced technique in material production, was used to fabricate ZA40/SiC/h-BN hybrid composites. In the milling process, the asreceived powders were mechanically milled at 400 rpm under a protective argon atmosphere for 2 h at room temperature. The hybrid composite powders were consolidated under 700 MPa pressure at 515 • C for 3 h by hot pressing. Weight losses, friction coefficients, and wear rates were calculated by traveling 100 and 200 m at 250 rpm in a ball-on-disc abrasion test setup under 5 and 10 N loads. According to the results, it was seen that SiC and increased h-BN reinforcement changed the mechanical and physical properties of the composites and made significant contributions to the wear resistance and load-carrying capacity. K e y w o r d s : ZA40, silicon carbide, boron nitride, wear, hot pressing
“…Alipour et al reported that, the increase in GNP % in AA7068 matrix decreases the wear loss [ 41 ]. From the previous literatures it is evident that, the addition of hard reinforcements like SiC and Silicon nitride influenced the WR of the metal matrix composites fabricated by various routes [ 42 , 43 ]. Fig.…”
“…Guidance for the optimal design of surface textures in practical engineering applications has been provided. Different studies related to the tribological properties of ZA27/SiC/Gr hybrid composite materials that can be used as a bearing material have been performed experimentally [31] and analytically [32].…”
This study presents a numerical study of the effect of microridges on the performance of the three-lobe journal bearing considering lubricant compressibility and cavitation effects. A mathematical model based on the Reynolds equation that has been modified to take into account the effects of lubricant compressibility and cavitation has been proposed to achieve the primary goal of this work. Lubricant compressibility is considered by using lubricating oils with different bulk moduli while Elord's algorithm was used to consider the effect of cavitation. The governing equations for finite length journal bearing lubricated with Newtonian oil in laminar flow and isothermal condition are numerically discretised using the finite difference method and solved by using a suitable prepared computer program. The performance of the rough and smooth bearings was compared for plain and three-lobe journal bearings. The numerical model was demonstrated by comparing the pressure distribution for smooth and microridges three-lobe journal bearing with that published by El-Said et al. and they were found in good agreement. It was found that the pressure and the load were considerably enhanced and the coefficient of friction decreased by 15 % for three-lobe journal bearing with microridges in comparison with that of smooth surfaces.
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