Engineering:Cold spray additive manufacturing

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Cold spray additive manufacturing (CSAM) (also called cold spray 3D printing) is a particular application of cold spraying, able to fabricate freestanding parts or to build features on existing components. During the process, fine powder particles are accelerated in a high-velocity compressed gas stream, and upon the impact on a substrate or backing plate, deform and bond together creating a layer. Moving the nozzle over a substrate repeatedly, a deposit is building up layer-by-layer, to form a part or component. If an industrial robot or computer controlled manipulator controls the spray gun movements, complex shapes can be created. To achieve 3D shape, there are two different approaches. First to fix the substrate and move the cold spray gun/nozzle using a robotic arm, the second one is to move the substrate with a robotic arm, and keep the spray-gun nozzle fixed. There is also a possibility to combine these two approaches either using two robotic arms[1] or other manipulators.[2] The process always requires a substrate and uses only powder as raw material. This technique is distinct from selective laser melting or electron-beam additive manufacturing or other additive manufacturing process using laser or electron beam for melting the feedstock materials.

History

The origins of the cold spray process go back to the beginning of the 20th century, when it was developed and patented by Thurston.[3] The process was further investigated by in the 1950s by Rocheville[4][3] and was re-discovered in the 1980s at the Institute of Theoretical and Applied Mechanics of the Russian Academy of Science[5] and developed as a coating technology. The process started to be employed for additive repair and fabrication of freeform structures, that can be considered as additive manufacturing, at the beginning of the 21st century, when the first commercial cold spray system was introduced in the market.[6]

Process

Additive manufacturing employing the process of cold spraying and its benefits can be considered as a deposition process, capable to build freeform parts and structures at high rates. Since it is a solid-state coating deposition process, during the process no melting of the feedstock material (metal powder) occurs, there are no heat related distortion and no protective atmosphere required, which enables to build up structures layer-by-layer. Theoretically, it allows for manufacture without size limitations for fabricating individual components or repairing damaged components.

The largest 3D printer or Additive Manufacturing machine utilizing cold spray can build parts up to 9×3×1.5 m.[7] During the cold spray process, the impacting particles create the layer, whose thickness can differ, based on the spray gun travel speed against the substrate and the feedstock material feed rate, building the structure layer-by-layers.

Materials

In cold spraying, the principle of the process is based on plastic deformation of the feedstock powder particles, therefore it is suitable to deposit with this technique mainly pure metals and alloys, but also metallic glasses, metal matrix composites and in some cases polymers.[4] The research and development activities recently focusing on a few most challenging materials for the aircraft, space and defence industry such as aluminum alloys,[8] nickel base superalloys,[9][10] different steel grades[11][12] and titanium alloys[13][14]

Applications

Space and aerospace applications

  • Propellant tank additive manufacturing, exploiting the advantage of the process to deposit titanium and titanium alloys without melting the feedstock material.[15]
  • Thrust chambers, combustion chambers and rocket nozzles, where the process gives the benefit of unlimited dimensions and combination of different materials, which is also utilized to create the channels for conformal cooling of these components.[16]
  • The additive manufacturing repair developed for aircraft engine components is utilizing the solid state of the cold spray process, using 2 robotic arms and on-line 3D scanning to apply the deposit onto the complex geometry of a fan blade.[1]
  • The cold spray additive manufacturing process is also applied for additive repair of gearboxes and other aircraft components.[17]

Tool and mould making

Forming, casting and stamping tools with conformal cooling and heating conducting elements, enabling shorter cycle times and significantly longer lifetime of these tools[18][19]

Defence applications

Titanium drones. Titomic built a 1.8 meter quadcopter at their R&D Bureau in Melbourne, Australia using their version CSAM. The article also talks about Titomic being contracted to make test parts for Boeing.[20]

Other applications

  • Titanium tubes and other direct manufactured components[21]
  • Permanent magnets for electric motors, deposited directly to the motor housing using the cold spray additive manufacturing technique, leading to reduced cost and providing greater freedom in the design process[22]

Difference from other AM methods

The most significant differences between the cold spray additive manufacturing process and other additive manufacturing processes are the low temperature, solid state of the process, avoiding melting the feedstock material.

Benefits

  • Very high deposition rates, up to 20 kg/h depending on the material density.
  • No protective atmosphere required.
  • Possibility to connect or combine dissimilar materials, such as metals with different melting point.
  • Build-up dimensions limited only by the spray-gun and/or component manipulator.
  • Capable to deposit almost all metals & alloys.
  • The process has low energy consumption and produces no toxic waste.
  • Possibility to collect and reuse 100% of particles (actual recovery rates unknown).
  • Application of several powder feeders permits to perform separate injection of different materials in case of deposition of multicomponent deposits.
    [23]

Drawbacks

  • The process resolution is limited due to the "spray spot" size, which is usually of several millimeter.
  • Due to the severe plastic deformation of the particles, residual stresses in the deposit can accumulate, leading to distortion, deformation or cracks.
  • To reach the mechanical properties of the additive manufactured components, comparable to bulk material properties, post treatment of the component might be required.

Equipment producers

See also

3D printing
Electron-beam freeform fabrication
Selective laser sintering
Selective laser melting

References

  1. ↑ 1.0 1.1 Alhart, Todd (15 December 2017). "Brothers In Arms: These Robots Put A New Twist On 3D Printing". https://www.ge.com/reports/brothers-arms-robots-put-new-twist-3d-printing/. 
  2. ↑ 2.0 2.1 "Maschinenfabrik Berthold Hermle AG - Hermle MPA Technology – additive manufacturing, milling at its best" (in en). 4 July 2019. https://www.hermle.de/en/services/additive_manufacturing?file=..%252Fablage%252Fmed_00000090_1432125612_flyer_mpa_technology_v10_14_en.pdf&filename=flyer_mpa_technology_v10_14_en.pdf&filetitle=Info+leaflet+about+Hermle+MPA+technology+(german)&basis=..%252F. 
  3. ↑ 3.0 3.1 Morgan, R. H. (2003). "Cold Gas Dynamic Manufacturing - A new approach to Near-Net Shape Metal Component Fabrication". Mat. Res. Soc. Symp. Proc. 758 (Mat. Res. Soc. Symp. Proc): 73–84. https://apps.dtic.mil/dtic/tr/fulltext/u2/p014221.pdf. Retrieved 3 July 2019. 
  4. ↑ 4.0 4.1 Raoelison, R.N. (2017). "Cold gas dynamic spray additive manufacturing today: Deposit possibilities, technological solutions and viable applications". Materials and Design 133 (133): 266–287. doi:10.1016/j.matdes.2017.07.067. 
  5. ↑ Papyrin, Anatolii (2007). Cold spray technology. Elsevier. p. 336. ISBN 978-0-08-045155-8. https://www.sciencedirect.com/book/9780080451558/cold-spray-technology. 
  6. ↑ Morgan, R. H; Sutcliffe, C. J.; Pattison, J.; Gallagher, C.; Fox, P.; O'Neill, W.; Murphy, M. (2003). "Cold Gas Dynamic Manufacturing - A new approach to Near-Net Shape Metal Component Fabrication". Mat. Res. Soc. Symp. Proceedings 758. https://apps.dtic.mil/dtic/tr/fulltext/u2/p014221.pdf. Retrieved 5 July 2019. 
  7. ↑ "AUS - World's Largest 3D Printer Prints 1.8 Metre Titanium Drone" (in en). 4 July 2019. https://www.foundry-planet.com/equipment/detail-view/aus-worlds-largest-3d-printer-prints-18-metre-titanium-drone/?cHash=a2de7eea27a8fdacf6978ccd1468eff6. 
  8. ↑ Petráčková, K.; Kondás, J.; Guagliano, M. (25 September 2017). "Mechanical Performance of Cold-Sprayed A357 Aluminum Alloy Coatings for Repair and Additive Manufacturing". Journal of Thermal Spray Technology 26 (8): 1888–1897. doi:10.1007/s11666-017-0643-5. Bibcode: 2017JTST...26.1888P. 
  9. ↑ Bagherifard, Sara; Monti, Stefano; Zuccoli, Maria Vittoria; Riccio, Martina; Kondás, Ján; Guagliano, Mario (April 2018). "Cold spray deposition for additive manufacturing of freeform structural components compared to selective laser melting". Materials Science and Engineering: A 721: 339–350. doi:10.1016/j.msea.2018.02.094. 
  10. ↑ Bagherifard, Sara; Roscioli, Gianluca; Zuccoli, Maria Vittoria; Hadi, Mehdi; D’Elia, Gaetano; Demir, Ali Gökhan; Previtali, Barbara; Kondás, Ján et al. (23 May 2017). "Cold Spray Deposition of Freestanding Inconel Samples and Comparative Analysis with Selective Laser Melting". Journal of Thermal Spray Technology 26 (7): 1517–1526. doi:10.1007/s11666-017-0572-3. Bibcode: 2017JTST...26.1517B. 
  11. ↑ Chen, Chaoyue; Yan, Xingchen; Xie, Yingchun; Huang, Renzhong; Kuang, Min; Ma, Wenyou; Zhao, Ruixin; Wang, Jiang et al. (January 2019). "Microstructure evolution and mechanical properties of maraging steel 300 fabricated by cold spraying". Materials Science and Engineering: A 743: 482–493. doi:10.1016/j.msea.2018.11.116. 
  12. ↑ Yin, Shuo; Cizek, Jan; Yan, Xingchen; Lupoi, Rocco (July 2019). "Annealing strategies for enhancing mechanical properties of additively manufactured 316L stainless steel deposited by cold spray". Surface and Coatings Technology 370: 353–361. doi:10.1016/j.surfcoat.2019.04.012. 
  13. ↑ MacDonald, D.; Fernández, R.; Delloro, F.; Jodoin, B. (9 December 2016). "Cold Spraying of Armstrong Process Titanium Powder for Additive Manufacturing". Journal of Thermal Spray Technology 26 (4): 598–609. doi:10.1007/s11666-016-0489-2. 
  14. ↑ Chen, Chaoyue; Xie, Yingchun; Yan, Xingchen; Yin, Shuo; Fukanuma, Hirotaka; Huang, Renzhong; Zhao, Ruixin; Wang, Jiang et al. (May 2019). "Effect of hot isostatic pressing (HIP) on microstructure and mechanical properties of Ti6Al4V alloy fabricated by cold spray additive manufacturing". Additive Manufacturing 27: 595–605. doi:10.1016/j.addma.2019.03.028. 
  15. ↑ "TWI expert delivers cold spray talk to European Space Agency". https://www.twi-global.com/media-and-events/press-releases/2019/twi-expert-delivers-cold-spray-talk-to-european-space-agency. 
  16. ↑ Gradl, Paul R (25 July 2016). Rapid Fabrication Techniques for Liquid Rocket Channel Wall Nozzles. https://ntrs.nasa.gov/search.jsp?R=20160009709. Retrieved 4 July 2019. 
  17. ↑ Bovalino, Yari M. (15 November 2017). "Secret Weapon: This Supersonic Blaster Rebuilds Jet Parts With Flying Powder". https://www.ge.com/reports/secret-weapon-supersonic-blaster-rebuilds-jet-parts-flying-powder/. 
  18. ↑ "Maschinenfabrik Berthold Hermle AG - Applications of Hermle generative MPA technology" (in en). 4 July 2019. https://www.hermle.de/en/services/additive_manufacturing/applications_mpa/getPrm/entry/conformal_cooling/. 
  19. ↑ "HERMLE MPA - Additive fretigen". https://www.th-owl.de/fb7/fileadmin/download/labore/konstruktion/06_Tagungen/01_RP_Tagungen/23_RP/Derntl_Hermle.pdf. 
  20. ↑ Smith, Phillip (8 May 2019). "AUS - World's Largest 3D Printer Prints 1.8 Metre Titanium Drone" (in en). https://dronebelow.com/2019/05/08/worlds-largest-3d-printer-prints-1-8-metre-titanium-drone/. 
  21. ↑ Jahedi, Mahnaz Z.; Zahiri, Saden H.; Gulizia, Stefan; Tiganis, Bill; Tang, C.; Fraser, Darren (April 2009). "Direct Manufacturing of Titanium Parts by Cold Spray". Materials Science Forum 618-619: 505–508. doi:10.4028/www.scientific.net/MSF.618-619.505. 
  22. ↑ Davies, Sam (29 January 2018). "Canadian researchers utilise cold spray additive manufacturing for electric motor magnets" (in en-gb). https://www.tctmagazine.com/3d-printing-news/researchers-cold-spray-additive-manufacturing-magnets/. 
  23. ↑ Sova, A.; Grigoriev, S.; Okunkova, A.; Smurov, I. (2 August 2013). "Potential of cold gas dynamic spray as additive manufacturing technology". The International Journal of Advanced Manufacturing Technology 69 (9–12): 2269–2278. doi:10.1007/s00170-013-5166-8. 
  24. ↑ "SPEE3D". https://www.spee3d.com/. 
  25. ↑ "Titomic - Industrial Scale Additive Manufacturing, 3D Printing, Titanium, Innovative, Melbourne, Australia". https://www.titomic.com/. 
  26. ↑ "CenterLine Supersonic Spray Technology". https://www.supersonicspray.com/. 
  27. ↑ "Impact Innovations - Global technology leader for industrial cold spray". https://impact-innovations.com/en/. 
  28. ↑ "Kinetic Metallization: Coatings Once Thought Impossible". https://www.inovati.com/. 
  29. ↑ "Cold Spray System PCS-1000". http://www.plasma.co.jp/en/products/coldspray.html. 
  30. ↑ "VRC Metal Systems – Making Metals Work". https://vrcmetalsystems.com/. 
  31. ↑ "Powders on Demand". https://www.powdersondemand.com/solvus/. 
  32. ↑ "BaltiCold Spray". http://www.dymet.ee/. 



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