Actual Problems in Machine Building 2014 No. 1

Materials Science in Machine Building I International Scientific and Practical Conference « Actual Problems in Machine Building » ________________________________________________________________ 488 4. Ермаков С. А., Карасёв М. В., Клубникин В. С. и др. Способ плазменной обработки и плазмотрон // Патент WO 90/12123, 1990. 5. Григорьев С. Н., Ковалёв О. Б., Кузьмин В. И. и др. Новые возможности технологии плазменного напыления износостойких покрытий // Трение и износ, т. 34, № 3, 2013. С. 221-226. Plasma spraying of powder coating with gas-dynamic focusing of disperse phase V. I. Kuz'min, E.V. Kartaev, D.V. Sergachev, E.E. Kornienko, E.U. Lapushkina, A.O. Tokarev The advantages of plasma spraying with distributed annular injection of powder as compared to point injection are presented in the paper. It is shown that annular injection with gas-dynamic focusing provides for dense axisymmetric heterogeneous flow in contrast to the point injection. It promotes the maximum velocity of the plasma jet and the maximum penetration of particles of sprayed powder. It is shown that in this case physico-mechanical properties of the sprayed coatings are essentially improved. Keywords: Plasma torch with an inter-electrode insert, unit of annular injection of power materials, spraying of ceramic and metal materials, axisymmetric heterogeneous flow, sprayed coatings.