Abstract
Abstract BCN coatings with different chemical compositions were prepared using RF magnetron sputtering via adjusting N2 flow. The influence of N2 flow on the bonding structure, mechanical and tribological properties of coating was studied. The structural analysis indicated the coexistence of B-N, B-C, and N-C bonds, suggesting the formation of a ternary BCN hybridization. The maximum Vickers hardness of 1614.7 HV was obtained at the low N2 flow (5 sccm), whereas the adhesion strength of BCN coatings on 316L stainless steel was improved with an increase of N2 flow. The friction behavior of BCN coatings sliding against different materials (acerbic, beech and lauan wood) was performed using ball-on-disk tribo-meter in air. The low friction coefficient was easier to obtain as sliding against hardwood i.e. acerbic balls. BCN-5 and BCN-10 coatings presented better wear resistance regardless of softwood or hardwood, whilst other two coatings were more suitable for mating softwood i.e. beech and lauan.
Highlights
Ternary boron-carbo-nitride (B-C-N) coating attracts much attention due to its potential applications as tool or antiwear material [1, 2]
The low friction coefficient was easier to obtain as sliding against hardwood i.e. acerbic balls
The following conclusions are obtained: (1) The boron content decreased from 14.3 at.% to 7.2 at.% with an increase of N2 flows
Summary
Ternary boron-carbo-nitride (B-C-N) coating attracts much attention due to its potential applications as tool or antiwear material [1, 2]. Researchers tried to control the chemical composition of B-C-N coatings to improve their mechanical and tribological properties [6,7,8,9,10,11], For example, the increased boron content could improve the hardness as well as the residual stress of BCN coatings, while the lubrication of graphitized carbon transfer layer at 300 ∘C was critical to reduce the friction coefficient (~0.1) [6]. The increase of sp2C-C and sp2C-N bonds in coatings could enhance the hardness (11→ 18 GPa) and reduce the friction coefficient (μ = 0.4→ 0.2) of BCN coatings [7]. [9] found that the hardness of BCN coatings fluctuated in the range of 14.8~25.2 GPa as a function of nitrogen pressure (2.5~5.0 Pa). The highest hardness was obtained at the nitrogen pressure of 3.5 Pa due to a high fraction of C-B and sp3N-C bonds as well as a low fraction of sp2h-B-N bond
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