A Study of Laser Cladding on the NiCr/Cr₃C₂-WS₂-CaF₂ Coating

Abstract:

NiCr/Cr3C2-WS2-CaF2 mixed powders were prepared on 1Cr18Ni9Ti stainless steel substrate to fabricate high-temperature self-lubrication wear resistant composite coating by laser cladding. The microstructure of the coating was examined by means of XRD, SEM and EDS. The high-temperature dry sliding friction and wear behavior of the composite coating were evaluated by using a ball-on-block wear tester at room temperature, 300 and 600 , respectively. The results showed that the composite coating had a unique microstructure consisting of γ-(Ni,Fe) solid solution matrix, Cr7C3/WC reinforcement and CrS/WS2 lubricant particles. The hardness of NiCr/Cr3C2-WS2-CaF2 coating by laser cladding was lower than NiCr/Cr3C2 coating, but higher than stainless steel substrate significantly. It was because of the addition of solid lubricant. In the wear process, elevated temperature was helpful to form a lubricating transfer film. As a result, the NiCr/Cr₃C₂-WS₂-CaF₂ coating exhibited a notable anti-friction and wear resistance at 300 and 600 .

• Periodical: Materials Science Forum (Volumes 747-748)
• Pages: 146-151
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.747-748.146
• Online since: February 2013
• Authors: Shu Fa Chen, Cheng Long Feng, Jin Yang, Jin Song Chen
• Keywords: Composite Coating, High-Temperature Wear, Laser Cladding, Solid Lubrication

References

[1] H. M. Wang, Y. L. Yu and S. Q. Li. Microstructure and tribological properties of laser clad CaF2/Al2O3 self-lubrication wear-resistant ceramic matrix composite coatings[J]. Scripta Materialia, 2002, 47: 57-61.

DOI: 10.1016/s1359-6462(02)00086-6

[2] S.T. Zhang, J.S. Zhou, B.G. Guo, et al. Friction and wear behavior of laser cladding Ni/hBN self-lubricating composite coating[J]. Materials Science and Engineering A, 2008, 491: 47-54.

DOI: 10.1016/j.msea.2007.12.015

[3] X.F. Zhang, X.L. Zhang, A.H. Wang, et al. Microstructure and properties of HVOF sprayed Ni-based submicron WS2/CaF2 self-lubricating composite coating[J]. Trans. Nonferrous Met. Soc. China, 2009, 19: 85-92.

DOI: 10.1016/s1003-6326(08)60233-2

[4] C.B. Huang, L.Z. Du, W.G. Zhang. Preparation and characterization of atmospheric plasma-sprayed NiCr/Cr3C2-BaF2·CaF2 composite coating[J]. Surface & Coatings Technology, 2009, 203: 3058-3065.

DOI: 10.1016/j.surfcoat.2009.03.027

[5] X.L. Zhang, X.F. Zhang ,A.H. Wang, et al. Microstructure of Metal-based Solid Self-lubrication Coating by Laser Cladding[J]. China Mechanical Engineering, 2006, 17(19): 2084-(2088).

[6] D.S. Xiong. Lubrication behavior of Ni-Cr-based alloys containing MoS2 at high temperature[J]. Wear, 2001, 255: 1094-1099.

DOI: 10.1016/s0043-1648(01)00803-1

[7] T. Rajnesh, D.S. Xiong and J.L. Li. Effect of load and sliding speed on friction and wear behavior of silver/h-BN containing Ni-base P/M composites[J]. Wear, 2011, 270: 423-430.

DOI: 10.1016/j.wear.2010.08.013

[8] Y.J. Dong , H.M. Wang. Microstructure and dry sliding wear resistance of laser clad TiC and reinforced Ti-Ni-Si intermetallic composite coating[J]. Surface & Coatings Technology, 2009, 204: 731-735.

DOI: 10.1016/j.surfcoat.2009.09.024

[9] W. L. Ma, J. J. Lu. Effect of surface texture on transfer layer formation and tribological behaviour of copper-graphite composite[J]. Wear, 2011, 270: 218-229.

DOI: 10.1016/j.wear.2010.10.062

[10] Y. Liu, H.M. Wang. Elevated temperature wear behaviors of a Co-Mo-Si ternary metal silicide alloy[J]. Scripta Materialia, 2005, 52: 1235-1240.

DOI: 10.1016/j.scriptamat.2005.03.002