Regularities of Thick Layer Creation Coating on the Rotation Details Surface
DOI:
https://doi.org/10.20535/1810-0546.2015.2.91268Keywords:
Thick layer coating, Solid refractory compounds, Self-fluxing alloys, Centrifugal impregnation, Grain size, Structure, DensityAbstract
Background. Creation of theoretical and technological basics of obtaining thick layer coating from composite materials on the rotation details surface is actual task. In order to solve this problem, it is necessary to determine dependencies of coating properties from characteristics of material and obtaining conditions.
Objective. The purpose of this paper is conduction a model studies of thick layer coating of composite materials based on solid refractory compounds and self-fluxing alloys on the detail with a horizontal axis of rotation obtaining process. Investigation of the influence of density granules rotational angular velocity of shape, size of the particles (granules) form and size on the centrifugal force during sealing and impregnation, as a result, the density of the obtained products was assumed.
Methods. Acting stand for obtaining thick layer coatings by centrifugal impregnation of solid granules of refractory compounds melts of metals and alloys using induction heating in the external and internal surfaces of revolution was developed. Study of the properties and structure of the obtained materials was carried out using modern methods of determining the density of composite materials and optical and electron microscopy, computer technology.
Results. Physical and mathematical models of obtaining thick layer coatings on the surfaces of details of rotation were developed. It allows evaluation of the influence of pellets density, the angular velocity of shape rotation, particles (pellets) size and mold size to centrifugal force during sealing and impregnation, as a result, obtained products density. The dependence of the sealing force of the powder density is linear, the radius of the particles – cubic, the angular velocity – quadratic, and shape radius – a linear dependence. Real samples of coatings have been got and density and structure depending on the particle size distribution of solids part of coatings were studied. Obtained results are adequate for the proposed theoretical dependences in this work.
Conclusions. The regularities of structure formation and composite thick layer coatings properties, obtained by centrifugal impregnation of starting materials composition, and conditions of receipt.References
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