In the present paper, on the basis of our previous studies, we outline the physical fundamentals of the cold gas spraying technology. Main results of experimental and numerical studies of the interaction of one-component flows of metal microparticles with substrate surface are presented. Upon impacts of ductile metal microparticles, with increase of particle velocity, a transition from a destruction of the substrate to the formation of a coating (erosion-adhesion transition) occurs. At particle sizes 30 to 50 μm, the threshold velocity for the transition is minimal (∼ 500 m/s), and it increases to about 1300 m/c with increase or decrease of particle sizes. Specific features of the high-velocity impact interaction of particle mixtures “metal + ceramics” and “metal + metal” are analyzed. The high-velocity impact interaction of heterogeneous mixtures formed by dissimilar particles with substrate surface can lead to enhanced deposition efficiency and reduced threshold particle velocity for the erosion-adhesion transition.


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    Title :

    Fundamentals of cold spraying


    Contributors:

    Conference:

    INTERNATIONAL CONFERENCE ON THE METHODS OF AEROPHYSICAL RESEARCH (ICMAR 2016): Proceedings of the 18th International Conference on the Methods of Aerophysical Research ; 2016 ; Perm, Russia


    Published in:

    Publication date :

    2016-10-13


    Size :

    10 pages





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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