Diagnostics of Cold-Sprayed Particle Velocities Approaching Critical Deposition Conditions

Mauer G, Singh R, Rauwald KH, Schrüfer S, Wilson S, Vassen R (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Journal of Thermal Spray Technology ASM International

Book Volume: 26

Pages Range: 1423-1433

Journal Issue: 7

DOI: 10.1007/s11666-017-0596-8

Abstract

In cold spraying, the impact particle velocity plays a key role for successful deposition. It is well known that only those particles can achieve successful bonding which have an impact velocity exceeding a particular threshold. This critical velocity depends on the thermomechanical properties of the impacting particles at impacting temperature. The latter depends on the gas temperature in the torch but also on stand-off distance and gas pressure. In the past, some semiempirical approaches have been proposed to estimate particle impact and critical velocities. Besides that, there are a limited number of available studies on particle velocity measurements in cold spraying. In the present work, particle velocity measurements were performed using a cold spray meter, where a laser beam is used to illuminate the particles ensuring sufficiently detectable radiant signal intensities. Measurements were carried out for INCONEL® alloy 718-type powders with different particle sizes. These experimental investigations comprised mainly subcritical spray parameters for this material to have a closer look at the conditions of initial deposition. The critical velocities were identified by evaluating the deposition efficiencies and correlating them to the measured particle velocity distributions. In addition, the experimental results were compared with some values estimated by model calculations.

Authors with CRIS profile

Stefan Schrüfer

Additional Organisation(s)

Lehrstuhl für Werkstoffwissenschaften (Polymerwerkstoffe)

Involved external institutions

OC Oerlikon Corporation AG CH Switzerland (CH) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE) Rolls-Royce Deutschland Ltd & Co KG DE Germany (DE)

How to cite

APA:

Mauer, G., Singh, R., Rauwald, K.-H., Schrüfer, S., Wilson, S., & Vassen, R. (2017). Diagnostics of Cold-Sprayed Particle Velocities Approaching Critical Deposition Conditions. Journal of Thermal Spray Technology, 26(7), 1423-1433. https://dx.doi.org/10.1007/s11666-017-0596-8

MLA:

Mauer, G., et al. "Diagnostics of Cold-Sprayed Particle Velocities Approaching Critical Deposition Conditions." Journal of Thermal Spray Technology 26.7 (2017): 1423-1433.

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