Wear Behavior of Plasma-Sprayed Al-Si/TiB2/h-BN Composite Coatings

Abstract

In this study, mechanically alloyed Al-12Si/TiB 2 /h-BN composite powder was deposited onto aluminum substrates by atmospheric plasma spraying. Wear performance of the coating was investigated with respect to the structural evolution of the composite powder coating. Non-lubricated ball-on-disk tests were used to examine the wear resistance of the coatings. The worn surfaces were examined using scanning electron microscopy and energy dispersive spectroscopy to elucidate the wear mechanisms operating at the sliding interface. It has been observed that TiB 2 and in situ formed AlN and Al 2 O 3 phases in combination with h-BN solid lubricant strongly affect the wear performance of the coating.

Dry sliding friction and wear behavior of (TiB2+h-BN)/2024Al composites

“…Compared with TiB 2 /2024Al composite, it can be concluded that the addition of h-BN improved the tribological properties especially at low sliding speed and low applied load. The reason why the addition of h-BN presented better friction-reduction and anti-wear properties is that h-BN had a lamellar crystalline structure which would provide the low shear stress [21].…”

“…Moreover, h-BN possesses the features of traditional lubricant, such as low density (similar to graphite, 2.25 g/cm 3 ), high stability and especially low reactivity with Al [19]. Moreover, h-BN has a lamellar crystalline structure, which provides excellent lubricating properties [20,21]. It can Materials and Design 87 (2015) 960-968 be found that among most solid lubricant, h-BN has been demonstrated excellent compatibility with TiB 2 /Al composites with reduced density and improved lubricant property.…”

Microstructural Changes and Mechanical Response of Aluminum-Based Composites Prepared with Dispersed CeO2 Nanoparticles

“…Aluminum and its alloys are attractive alternatives to replace some ferrous materials in many industrial applications because of their intrinsic properties, such as good machinability, surface finish capabilities, damage tolerance, low density, high specific strength, and good thermal and electrical conductivity [1][2][3][4][5][6]; all the above is combined with good mechanical properties. Aluminum alloys are excellent candidates for the synthesis of metal matrix composites (MMCs).…”

Microstructure and wear properties of Al 2 O 3 -CeO 2 /Ni-base alloy composite coatings on aluminum alloys by plasma spray

“…Aluminum alloys are widely used in machine building, aerospace industry, national defense and offshore exploration due to their low density, high specific strength, and good thermal and electrical conductivity [1][2][3][4]. However, further applications of aluminum alloys in severe wear conditions are restricted owing to their low hardness and poor wear resistance.…”