Avtomaticheskaya Svarka (Automatic Welding), #10, 2017, pp. 28-34
Efficiency of process of coating spraying using multichamber detonation unit
O.V. Kolisnichenko1, Yu.N. Tyurin1 and R. Tovbin2
E.O. Paton Electric Welding Institute of the NAS of Ukraine
11 Kazimir Malevich Str., 03150, Kiev, Ukraine. E-mail: email@example.com
Sputtek Inc. 1 Goodmark Place, Unit 4, Toronto, Ontario, Canada M9W 6M1
A multichamber detonation unit is designed for coating deposition using powder materials. Heating and acceleration of powders is carried out by detonation combustion products of gas mixture of propane, oxygen and air with 20 Hz frequency and more. A difference of multichamber detonation unit is a presence of additional combustion chamber, which rises gas-dynamic parameters of the detonation products and efficiency of spraying process. Effect of unit design peculiarities on gas-dynamic parameters of detonation products was determined. Velocity of detonation products reaches 1520 m/s, detonation wave pressure makes approximately 3.5 MPa. Velocity of the sprayed particles using this unit reaches 1200 m/s. The unit is equipped with a valveless system for gas and powder feeding. This provides reliable operation at high frequency of detonation initiation (up to 50 Hz). A spraying deposition efficiency at that reaches 82 and 67 % for cermet powders and oxide ceramics, respectively. Coatings received at that are characterized with small porosity (< 1 %) and high adhesion to substrate. 13 Ref., 1 Table, 6 Figures.
multichamber detonation unit, velocity and pressure of detonation products, spraying deposition efficiency, velocity and extention of powder jet
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