Mechanical and tribological evaluation of CrSiCN, CrBCN and CrSiBCN coatings

• Published in: Tribology international 2019-02, Vol.130, p.146-154
• Main Authors: Wang, Qianzhi, Zhou, Fei, Zhu, Lian, Zhang, Maoda, Kong, Jizhou
• Format: Article
• Language: English
• Subjects: Coating effects; Coefficient of friction; CrCN; Doping; Friction; Iron oxides; Mechanical properties; Protective coatings; Shear strength; Si-B doping; Silicon; Tribological properties; Tribology; Wear rate
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2018.09.025

To pinpoint effect of Si-B duplex doping compared to Si and B simplex doping, tribological properties of CrSiCN, CrBCN and CrSiBCN coatings were compared. It was found that CrSiCN coating was still intact after tribotest due to protection of iron oxides from GCr15 counterpart. In contrast, CrBCN coating presented the highest wear rate (4.9 × 10−6 mm3/Nm) while CrSiBCN coating showed a medium wear rate (2.3 × 10−6 mm3/Nm). For the same reason, CrSiCN/GCr15 tribopair presented the lowest friction coefficient (μm = 1.07) because of low shear strength of iron oxides. CrSiBCN/GCr15 and CrBCN/GCr15 tribopairs presented a higher friction coefficient (μm = 1.17 and μm = 1.43). The results indicated that Si-B duplex doping was superior to B simplex doping but inferior to Si simplex doping for improving tribological properties. Fig (a) Wear rate of CrSiCN/GCr15, CrBCN/GCr15 and CrSiBCN/GCr15 tribopairs (b) Contours of wear track on CrSiCN, CrBCN and CrSiBCN coatings. [Display omitted] •CrSiBCN quinary coating with a nano-composite structure was fabricated.•Si-B duplex doping is superior to B simplex doping in enhancing tribological properties.•Si simplex doping is superior to Si-B duplex doping in enhancing tribological properties.