Densification and Purification of Cold Sprayed Ti Coating Layer by Using Annealing in Different Heat Treatment Environments

Abstract:

This study investigated the densification and purification properties of cold sprayed titanium coating layer by using annealing in different heat treatment environments. The annealing was conducted at 600°C/1h and three kinds of environments of vacuum, Ar gas, and 5%H2+Ar mixture gas were controlled. Cold sprayed Ti coating layer (as sprayed) represented 6.7% of porosity and 228 HV of hardness. Regardless of gas environments, all of those thermally heat treated coating layers consisted of pure α-Ti and minimal oxide. Vacuum environment during heat treatment represented superior densification properties (3.8% porosity, 156.7 HV) to those of Ar gas (5.3%, 144.5 HV) and 5%H2+Ar mixture gas (5.5%, 153.1 HV). From the results of phase analysis (XRD, EPMA, SEM, EDS), it was found that vacuum environment during heat treatment could be effective for reducing oxide contents (purification) in the Ti coating layer. The characteristic of microstructural evolution with heat treatment found to be different at three different gas environments.

• Periodical: Advanced Materials Research (Volumes 602-604)
• Pages: 1604-1608
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.602-604.1604
• Online since: December 2012
• Authors: Ji Sang Yu, Hyung Jun Kim, Ik Hyun Oh, Kee Ahn Lee
• Keywords: Cold Spraying, Densification, Gas Environment, Heat Treatment, Purification, Titanium

References

[1] Y. T. Lee: Machine & Material. Vol.21 (2009), p.74.

[2] I. N. Andijani: Desalination. Vol. 45 (2000), p.129.

[3] K. Binder, F. Gärtner and T. Kassen: 2010 International Thermal Spray Conference, ASM International, Singapore, (2010), p.264.

[4] J. Villafuerte: Metal Fishing. Vol.108 (2010), p.37.

[5] W. Wong: Adv. Mater. Res. Vol.89 (2010), p.639.

[6] J. W. Lim, J. W. Bae, Y. F. Zhu, S. Lee, K. Mimura and M. Isshiki: Surf. Coat. Technol. Vol.201 (2006), p.1899.

[7] Cold Spray Technology, A. Papyrin, V. Kosarev, S. Klinkov, A. Alkimov and V. Formin (Ed.), Elsevier, Oxford. (2007), p.49.

DOI: 10.1016/b978-008045155-8/50004-1

[8] T. H. V. Steenkiste: Key Eng. Mater. Vol.197 (2001), p.59.

[9] H. J. Kim, C. H. Lee and S. Y. Hwang: Mater. Sci. Eng. A. Vol.391 (2005), p.243.

[10] J. Voyer, T. Stoltenhoff and H. Kreye: 2003 International Thermal Spray Conference, ASM International,Ohio. (2003), p.71.

[11] R. C. McCone: 2003 International Thermal Spray Conference, ASM International, Ohio. (2003), p.63.

[12] W. Wong, Montreal/CDN, E. Irissou, J. G. Legoux, Boucherville/CDN and S. Yue, Montreal/CDN: 2011 International Thermal Spray Conference, ASM International. Hamburg. (2011), p.65.

[13] D. Borgmann, E. Hums, G. Hopfengattner, G. Wedler, G.W. Spitznagel, and I. Rademacher :J. Electron. Spectrosc. Relat. Phenom. Vol.63 (1993), p.91.

[14] S.D. Gardner, C.S.K. Singamsetty, G.L. Booth, G.R. He, and C.U. Pittman : Carbon, Vol.33 (1995), p.587.