Abstract
The models of measuring the velocity and temperature of particles using the processing of their track images are introduced. The method of brightness pyrometry of moving objects uses the calibration procedure based on the static temperature standard. Performance of the statistical analysis of thermal data by means of optical control system of the particles properties in gas-thermal spraying flow equals to 2200-2700 particles per second. Investigation of stationary plasma spraying process allowed to obtain the distributions of velocity and temperature of particles over the volume of spraying jet. The error in determining the velocity of the particles was 1%, and the error in determining the temperature is 3%.
Highlights
The effective way of deposition of protective and functional coatings onto the machine parts is realized by means of the various thermal spraying technologies [1, 2]
Velocity and temperature of the particles are the "key" physical parameters that define the basic characteristics and quality of the coating as a whole. The control of these parameters allows to maintained of the required quality of spraying coatings, optimize the operation modes of the processing station to improve the efficiency of use of raw materials, and to carry out the adaptation process of technological mode at the transition to processing station of another class
Experiments were conducted in Khristianovich Institute of Theoretical and Applied Mechanics SB RAS at the spraying facility using 50 kW DC plasma torch for production of hollow ceramic spheres [14] from yttria-stabilized zirconia (YSZ) feedstock powders of 50-56 mkm diameter (204B, Sultzer Metco)
Summary
The effective way of deposition of protective and functional coatings onto the machine parts is realized by means of the various thermal spraying technologies [1, 2]. Velocity and temperature of the particles are the "key" physical parameters that define the basic characteristics and quality of the coating as a whole. The control of these parameters allows to maintained of the required quality of spraying coatings, optimize the operation modes of the processing station to improve the efficiency of use of raw materials, and to carry out the adaptation process of technological mode at the transition to processing station of another class. The solution of this task requires the development of new methods with high resolution [5,6,7,8,9,10]
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