Research of open porosity of gas-thermal coatings with the modifying additives
Abstract
Methods of gas-thermal dusting are effective ways of drawing powder protective coatings on a surface of details of cars and mechanisms. In the course of gas-thermal dusting the coating is formed of the separate melted and melted-off particles of powder material. Particles with a high speed collide with a surface, are cooled and stiffen, forming a protective coating. Numerous physicomechanical processes at blow, deformation, cooling, hardening of particles, their interaction with the gas environment define structure and properties of a coating. One of important characteristics of the received powder coatings is their porosity with sizes of a time in rather wide range of 10-4 – 10-8 m.
Research objects in work are the wearproof coatings received by arc metallization of a powder wire with refractory additives of corundum Al2O3, a wires with additives of tungsten W and tantalum Ta and also the flowed gas-flame coatings with the ultradisperse modifying additives of spinels of cobalt and copper.
Dependences of open porosity of the wearproof modified coatings on technical characteristics on their receiving are studied. For this purpose the method of hydrostatic weighing has determined levels of open porosity of samples of the modified coatings on substrates. It is shown that the open porosity significantly depends on a look and the maintenance of modifiers of powder material, the modes of dusting and the subsequent heat treatment of a gas-thermal coating.
About the Authors
Nikolay Fedorovich Struchkov
Institute of physical-technical problems of the North, Siberian branch of RAS
Russian Federation
Russian Federation
Dmitriy Iosifovich Lebedev
Institute of physical-technical problems of the North, Siberian branch of RAS
Russian Federation
Russian Federation
Gennadiy Georgievich Vinokurov
Institute of physical-technical problems of the North, Siberian branch of RAS
Russian Federation
Russian Federation
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Review
For citations:
Struchkov N.F., Lebedev D.I., Vinokurov G.G. Research of open porosity of gas-thermal coatings with the modifying additives. Arctic and Subarctic Natural Resources. 2018;23(1):81-86. (In Russ.)
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