Prof. A.N. Papyrin is a specialist in gas-dynamics, combustion in high-speed two-phase flows, and new technologies based on the Cold Spray process. He is one of the inventors of the Cold Spray process and for the last twenty years he has performed extensive research in this field leading to advancing the Cold Spray for a broad diffusion to commercial markets. He has over 160 papers, 6 books, and 12 patents.Dr.Sc. V.F. Kosarev is a specialist in gas-dynamics and new technologies based on the Cold Spray process. He is one of the inventors of Cold Spray process. For the last twenty years he has carried out studies allowing to optimize the Cold Spray process and equipment and to develop various technologies. He has over 85 papers, 4 books, and 15 patents.Dr. S.V. Klinkov is an expert in gas dynamics of heterogeneous flows. His contribution in the book is modelling of high speed interaction of solid particles with a substrate as well as gas-dynamic processes taking place under Cold Spraying. He is an author and co-author of over 30 papers and 1 book in field of Cold Spray.Prof. A.P. Alkhimov is an expert in physical and chemical mechanics of high-speed heterogeneous flows, new technologies, and optic methods of diagnostics. He is one of the inventors of Cold Spray process and he developed various technologies in the field of Cold Spray. He has over 165 papers, 4 books and 18 patents.Prof. V.M. Fomin is a specialist in mathematical modelling in continuum mechanics. His scientific activity is connected with physics-mathematics modelling of the processes of high-speed collision of bodies. In the field of Cold Spray he has performed extensive research related to gas-dynamics and study of high speed particles impact. He is the author and co-author of more than 250 scientific publications, 7 monographs, and 6 patents.