Diagnostic and Imaging
of
Industrial Processes


Laboratory DIPI
Research
European Research Area
Industrial Partership
International Cooperation

SPRAYING TECHNOLOGIES

Research activities in Spraying Technologies concern a wide range of industrial technologies from plasma spraying to cold gas spraying. The advent of nanotechnology has enabled tailoring the structure of coatings at the nanoscale targeting a radical enhancement of their performance. Nanostructured coatings demonstrate remarcable potentials for a variety of industrial applications, from heavy-duty mechanics to micro eletro-mecanical systems. A real step-forward in coatings fabrication by spraying technologies will be achieved with the mutual advancement of the deposition techniques and the special nanostructured and nanocomposite powders.

Technologies under scope

    • Cold Spraying
    • Detonation Spraying
    • HVOF
    • Plasma Spraying

Research topics and objectives

1. Cold Spraying

Cold Spraying is a relatively young process and still considerable R&D efforts are needed to both understand and control the process, as well as develop engineered coatings with desired properties for specific applications. Particularly interesting task is to process manifold powder materials at a time and to achieve this way composite coatings with enhanced and multi-functional performance. This requires advanced study of hydrodynamics (nozzle geometry), heat transfer (gas heater and powder feeding), projection phenomena (particle beam expansion). Development of process control methodology and equipment is also of a high importance for technology progress.

2. Detonation Spraying

Application of the original knowledge opened the way to much more versatile and effective process compare to currently commercialised D-gun.
Spraying in Overdriven Detonation Mode spreads the range of processed materials to hard-melting ones and, at the same time, make possible to coat such heat sensitive materials as plastics. This advanced technique can be realised by the gun considerably smaller anf lightweight than the conventional D-gun. Overall production rate is several times higher. General objective of experimental study is to realise all the potentials of the innovative techniques and to develop it into production technology.

3. Thermal Spraying (Plasma, HVOF)

The potentials of thermal spraying in nanostructured coatings fabrication are far from beeing realised. To obtain good adhesion and density of the coating, the basic material of the coating should be melted (this is particularly the case for PS and HVOF). Along with this, the nanostructured compounds should be prevented from thermal decomposition. Further progress is possible by the conjugated advancement of deposition techniques and processed nanostructured materials. Comprehensive process control shall be applied to optimise thermal spraying technologies.

Equipment

  • Original Cold Spraying system
  • Original Detonation Spraying system (under construction)
  • Industrial type spraying cabine

    • Participants

    Staff: Smurov I., Bertrand Ph., Missemer F., Bayle F., Thivillon L.
    Ph.D. students: Sova A.
    Associates: Kosarev V., Ulianitsky V., N. I. Smirnov, Ignatiev M., Movchan I.

    Selected publications

    1. V.Yu. Ulianitsky, Ph. Bertrand, I. Smurov, Recent progress in detonation spraying of protective coatings // E-MRS-2007 Spring Meeting, Strasbourg, France, May 28- June 1, Symposium Q (Protective coatings and thin films), accepted.

    2. N.I. Smirnov, I. Smurov Nanostructured wear resistant WC-Co coating fabricated by detonation spraying and by hot pressing //ibid, accepted.

    3. S.V. Klinkov, V.F. Kosarev, A.A. Sova, E.S. Sidyakina, Ph. Bertrand, I. Smurov, Influence of the spraying angle on the properties of the cold spray coatings //ibid, accepted.

    4. S.Dyshlovenko, L.Pawlowski, B.Pateyron, I. Smurov, J.H.Harding, Modelling of plasma particle interactions and coating growth for plasma spraying of hydroxyapatite // Surface and Coatings Technology, Volume 200, Issues 12-13, 31 March 2006, pp. 3757 - 3769.

    5. S.Dyshlovenko, L.Pawlowski, I. Smurov, V. Veiko. Pulsed laser modification of plasma-sprayed coatings : Experimental processing of hydroxyapatite and numerical simulation // Surface and Coatings Technology, Volume 201, 2006, pp. 2248 - 2255.