Tantalum Based High-Pressure Cold Spray Coatings on Stainless Steel Substrate

Abstract:

Tantalum as a transition element possesses good corrosion resistant properties, along with ductility and hardness. It is also one of the best heat-resistant material (melting point 2996°C) and is known for its high heat and electrical conductivity. In this research, Tantalum is deposited on stainless steel substrate using high-pressure cold spray (HPCS) method. Cold spray coating technology enables the deposition of powder feedstock without melting. Feedstock particles are propelled through a nozzle at supersonic velocities and they deform plastically on impact, resulting in good bonding strength to the substrate. The low temperature and solid-state deposition associated with cold spray allows refractory materials such as Ta, Mo, and W to be deposited without high temperature requirements. The objective of this work is to achieve a dense and nonporous coating microstructure with a high deposition efficiency. The hardness of as-received tantalum particles is found to be 279 HV_0.3 and the microstructure is very dense. Tensile testing carried on the sample coated at a stagnation gas pressure of 50 bar and gas inlet temperature of 900°C exhibited an ultimate tensile strength of 442 MPa and adhesion strength of 77 MPa. Further mechanical properties of the coating in terms of hardness is carried out by nanoindentation. These results will be correlated with microstructural imaging and elemental analysis including morphology and composition using scanning electron microscopy and X-ray diffraction techniques.

• Periodical: Key Engineering Materials (Volume 813)
• Pages: 429-434
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.813.429
• Online since: July 2019
• Authors: Jagannadh V.S.N. Sripada, Megil F. Gallant, Gobinda C. Saha*, Reeti Singh, Jan Kondas
• Keywords: Adhesion Strength, Coating, Feedstock Particle, High-Pressure Cold Spray, Tantalum

References

[1] H. Koivuluoto, Corrosion properties of Cold-Sprayed Tantalum Coatings, Journal of Thermal Spray Technology. 18 (2009) 75-82.

DOI: 10.1007/s11666-008-9281-2

[2] T. Goyal, R.S. Walia, T.S. Sidhu, Effect of Parameters on Coating Density for Cold Spray Process, Materials and Manufacturing Processes. 27 (2012) 193-200.

DOI: 10.1080/10426914.2011.566906

[3] J. VSN Sripada, M.F. Gallant, G.C. Saha, Study the effect of milling parameters on HE-MA nanostructured Al-Graphene cermet particles, Proceedings of 1st Coatings and Interfaces Web Conference (2019).

DOI: 10.3390/ciwc2019-06160

[4] R.P. Singh, U. Batra, Effect of Cold Spraying Parameters and Their Interaction on Hydroxyapatite Deposition, Journal of Applied Fluid Mechanics 6 (2013) 555-561.

[5] R.C. Dykhuizen, R.A. Neiser, Optimizing the Cold Spray Process, Thermal Spray: Advancing the Science and Applying the Technology, B.R. Marple and C. Moreau, Ed. (Orlando, Fl), ASM International, May 5-8, 2003, 79-83.

DOI: 10.31399/asm.cp.itsc2003p0019

[6] T. Stoltenhoff, H. Kreye, H. J. Richter, An analysis of the cold spray process and its coatings, Journal of Thermal Spray Technology. 11 (2002) 542–550.

DOI: 10.1361/105996302770348682

[7] W. Wong, E. Irissou, A.N. Ryabinin, J.-G. Legoux, S. Yue, Influence of Helium and Nitrogen Gases on the Properties of Cold Gas Dynamic Sprayed Pure Titanium Coatings, Journal of Thermal Spray Technology. 20 (2011) 213- 226.

DOI: 10.1007/s11666-010-9568-y

[8] O.C. Ozdemir, C.A. Widener, D. Helfritch, F. Delfanian, Estimating the Effect of Helium and Nitrogen Mixing on Deposition Efficiency in Cold Spray, Journal of Thermal Spray Technology. 25 (2016) 660-671.

DOI: 10.1007/s11666-016-0394-8