Improvement of Surface Properties of Magnetic Shaft Material Inconel718 by HVOF Spray Coating of WC-CrCNi Powder

Abstract:

Article Preview

Micron-sized WC-CrCNi powder (WC-metal powder, WC 68%, C 0.56%, Cr 21% Ni 6%) was coated onto magnetic shaft material Inconel718 (In718) surface using HVOF thermal spraying equipment for the improvement of the surface properties of the shaft. During the HVOF coating, metal carbides, such as WC and Cr7C3 decomposed to W2C, metals and free carbon. The free carbon and the excesively sprayed oxygen formed carbon oxide gases and thus produced pores and voids in coating. The optimal coating process (OCP) that produced the lowest coating surface porosity and the highest surface hardness was determined by the Taguchi experimental program of nine processes for four spray parameters with three levels. Coatings with porosity 1.20±0.1% and hardness 1150±60 Hv were prepared using optimal coating processes. The coating was porous, but the hardness was improved approximately three times from 400±10 Hv (In718) to 1150±60 Hv (coating). Friction coefficients (FC) of the coating were lower compared with In718 at both 25°C and 450°C. FC decreased with increasing temperature from 25°C to 450°C for both In718 and the coating. Wear depths of coatings were smaller than those of In718 at both 25°C and 450°C. For the improvement of the surface properties and durability of the magnetic shaft, HVOF WC-CrCNi power coating was recommended.

Info:

Periodical:

Advanced Materials Research (Volumes 774-776)

Edited by:

Yun-Hae Kim and Prasad Yarlagadda

Pages:

1098-1102

Citation:

T.Y. Cho et al., "Improvement of Surface Properties of Magnetic Shaft Material Inconel718 by HVOF Spray Coating of WC-CrCNi Powder", Advanced Materials Research, Vols. 774-776, pp. 1098-1102, 2013

Online since:

September 2013

Export:

Price:

$41.00

[1] T.Y. Cho, J.H. Yoon, K.S. Kim, K.O. Song, Y. K Joo. W. Fang, S. H. Zhang, S.J. Youn, H.G. Chun, Y. Hwang, Surface and Coatings Technology, Vol. 202 (2008), pp.5556-5559.

DOI: https://doi.org/10.1016/j.surfcoat.2008.06.106

[2] J.R. Davis, Handbook of Thermal Spray Technology, ASM Thermal Spray Society (2004).

[3] B.D. Sartwel, R. Kestler, K.O. Legg, W. Assink, A. Nardi, J. Schell, Naval Research Laboratory Washington, DC, USA (2004).

[4] H.M. Kim, Journal of the Korean Institute of Metals and Materials, Vol. 38 (2000), p.125.

[5] T.Y. Cho, J. H. Yoon, K. S. Kim, W. Fang, Y. K. Joo, K. O. Song, S. J. Youn, S. Y. Hwang and H. G. Chun, J. Kor. Inst., Surf. Eng., Vol. 40-4 (2007), pp.170-174.

[6] T.Y. Cho, J. H. Yoon, K.S. Kim, S.J. Youn, N.K. Baek, H, G. Chun and S.Y. Park, Journal of the Korean Institute of Surface Engineering, Vol. 39 (2006), p.240.

[7] T.Y. Cho, Y.K. Joo, J.H. Yoon, H.G. Chun and S.H. Zahng, Adv. Mat. Res. Vol. 560-561 (2012) pp.1052-1058.

[8] S.H. Zhang, J. H. Yoon, Ming Xi Li, T. Y. Cho, Y. K. Joo, J. Y. Cho. Mat Chem & Phys., Vol. 119 (2010), pp.458-464.

[9] T.Y. Cho, J. H. Yoon, K. S. Kim, B. K. Park, S. J. Youn and N. K. Baek, 2006 Spring Conference, Korea Machine Tool (2006), p.291.

[10] T.Y. Cho, J.H. Yoon, S.K. Hur, H.G. Chun, Shi-hong Zhang, Materials Science Forum Vol. 686 (2011), pp.654-660.

[11] T.Y. Cho, J.H. Yoon, K.S. Kim, K.O. Song, Y.K. Joo, W. Fang, S.H. Zhang, S.J. Youn, H.G. Chun, S.Y. Hwang, Journal of Advanced Materials Research, Vol. 26–28 (2007), p.1325.

[121] T.Y. Cho, Y.G. Jung, J. H. Yoon, Y. K. Joo, H.G. Chun, Proceedings of the First Int'l Conference on Manufacturing Process Technology (ICMPT-01 2011), (2011).

[13] T.G. Massalski, J.L. Murry, L.H. Bennett, L. Kacprzak, American Society for Metals 1 (1986), p.600.

[14] H.Y. Lee, Corrosion of Metalls, " Yeujgyung Moonwha, (2004).