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4. Powder
Even more so than in other thermal spray processes, the powder that ultimately leads to the coating plays a major role in cold spray, due to the specific characteristics of this deposition method: low temperature and very high spray velocity. Low temperature means that the particle's microstructure imposes a high degree of metallurgical heredity on the deposit, while the particle's shape and size (summarized under the Goethian term morphology) strongly influence the spraying speed, and therefore the conditions of deposit formation and, consequently, its properties. Some might call this the nobility of the particle. More generally, knowledge of the characteristics of particles/powders is essential to the development and control of their processing conditions.
Given the size of the particles, certain characteristics may require the use of special techniques to determine...
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Powder
Deposition mechanisms
Bibliography
Standardization
- Metallic materials – Rotary bar bending fatigue tests. - BS ISO 1143 :2010 - Décembre 2010
- Essai d'adhérence par traction de revêtements projetés thermiquement. - ASTM C633-13 - 2017
- Thermal spraying – Tensile adhesion testing. - NF EN ISO 14916 - Mai 2017
- Particle size analysis – Laser diffraction methods. - ISO 13320 - Janvier 2020
- Environmental management – Lifecycle analysis – Principles...
Regulations
ATEX Directive 201/34/EU on equipment and protective systems intended for use in potentially explosive atmospheres.
Patents
DANTIN (B.) et al. – Airbus Group SAS, Structure with electrically conductive lines on the surface and process for producing electrically conductive lines by cold spray, Patent WO 2016/107918 A1, 2016.
CHOHRA (M.) et al. – Dassault-Aviation, Composite part featuring a functional layer and a polymer binder, and associated cold spray manufacturing process. French patent # 3 006 914, 2013.
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Directory
Manufacturers – Suppliers – Distributors (non-exhaustive list)
For high-pressure cold spray: Impact Innovations/Rattenkirchen-Germany
https://impact-innovations.com
For low-pressure cold spray: CenterLine Ltd./Windsor-Canada.
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