Device for precipitation of coatings in fluidised bed

FIELD: chemistry.

SUBSTANCE: invention relates to the field of obtaining pyrocarbon and carbide coatings in a fluidised bed (FB) of particles with a polyfractional composition, changing in the process of the coating precipitation, and can be used in nuclear and electronic equipment. A device for the coating precipitation in FB contains a chemical reactor and a system for the supply of fluidising gas in it. The chemical reactor is made in the form of a right parallelepiped with rounded edges and a rectangle-shaped base. One lateral face of the reactor has a square shape, another lateral face has a shape of a rectangle, whose area equals the area of the base. The ratio of areas of the lateral faces constitutes 1:(1.8-2), with the rectangular faces being provided with convexities in the places where diagonals cross.

EFFECT: increased stability of a totality of particles in the chemical reactor is provided which results in the prevention of a carryover of the particles, which the coating is applied on.

2 cl, 1 dwg

 

The invention relates to the field of production of pyrocarbon and coating in the fluidized bed (PS) particles molefractions composition, changing in the process of deposition, and can be used in atomic and electronic engineering.

Upon receipt of the coatings in the PS, the main difficulty lies in the destruction of the SS as the masses of particles, their density and diameter.

The stability of the fluidized bed (no stratification layer size and density of the particles, the absence of dead zones and entrainment of fines) provides ravnoudalennostj deposited coatings, uniformity and other characteristics (anisotropy, the microstructure of the coating.

The stability of the PS when changing the characteristics of the coated particles can be increased by changing the pressure in the zone substation. A device for deposition of the coatings described in the method of deposition of silicon carbide, comprising a pressure control unit in the range of 0.1 to 200 Torr (application for Japan patent No. 03130366 And from 21.01.97, IPC SW 38/00). The disadvantage of this device lies in the fact that the increase in pressure can stabilize PS only by increasing the mass of the particles is not higher than 50%.

Known apparatus for the deposition of coatings in the PS, including the chemical reactor of cylindrical shape, the heating unit and the gas supply system (U.S. patent No. 3 399 969 AND SW 31/00, 1968).

The disadvantage of this device lies in a small range of variation of the mass of the coated particles while maintaining the stability of the PS.

The closest technical solution adopted for the prototype is a device for deposition in the fluidized bed of carbon and carbides containing the reactor has a cylindrical shape and the system of gas supply and the source of the particles, and the inner surface of the cylindrical reactor made with vertical grooves (RF patent No. 2 274 498, IPC 05D 1/22 05D 3/04, SS 16/26, publ. 20.04.2006).

The known device provides increased stability of the fluidized layer, when changing the weight 10 times. However, the disadvantages described device should include the inability to provide stable operation of the reactor during the deposition of coatings on the particles, characterized by the equivalent diameter of more than 5 times. Indeed, at the optimum speed liquefaction of large particles small particles will be carried away from the reactor.

The basis of the offer of the invention is to prevent entrainment of particles, which are applied coating.

According to the invention, this task is solved in that the device for deposition in the fluidized bed containing the chemical reactor and the feed system siraudeau gas, chemical reactor done the n in the form of direct parallelepiped with rounded edges and a base in the form of a rectangle, one side face of the reactor has the shape of a square and the other side face, the shape of a rectangle, the area of which is equal to the area of the base, the ratio between the areas of the lateral faces is 1: (1.8 to 2), and rectangular faces at the intersection of the diagonals provided with protuberances, for example in the form of a dome with a diameter and height components respectively of 0.2-0.3 and 0.1-0.2 sides of the square.

The proposed device is shown schematically in the drawing, where: 1 - a great difference in the shape of a rectangle, 2 - less face in the shape of a square, 3 - convexity, 4 - input siraudeau gas, 5 - adapter.

The device operates as follows. At low speeds siraudeau gas particles are in the adapter 5, and then with the growth rate of rise in the reactor, and the form is not the standard mode of liquefaction (up-down), and rotational movement of the toroid ("harness"that collects the whole set of small and large particles).

The proposed device provides resistance mode liquefaction for particles with sizes differing by 2-3 times, and sets of masses of particles that differ in 3-4 times.

The design features of the proposed device are:

- performance of the reactor in the form of a direct box that allows you to ensure smooth rotation of the toroid with particles. The performance of the reactor in the form to the BA does not allow for the rotation of the particles, the performance of the reactor with the deviation of the areas of the faces of more than 2.0 slows down the speed of rotation of the toroid (with 1 turnover/sec to 0.2-0.4 turnover/s) with the appropriate stratification of the donut on the fine and coarse fraction and ash fines;

- rounding on the contact faces with a radius of 0.02-0.04 size of the edge of the square faces eliminates runout (moving along the vertical axis) of the entire toroid;

the presence of bumps on the large faces due to the fact that the toroid during the rotation does not concern small faces (the distance between them is great), but applies to large faces (the distance between them is less). It is experimentally shown that for the totality of microtool (the diameter of a core of nuclear fuel to 0.2 mm, the diameter of MICROTEL with outer shell of pyrocarbon - 0.5 mm) weight 150 g per rotation 2 min (the characteristic time of coating deposition of pyrocarbon) reducing the mass of microtalon amounted to 0.4 g for the reactor in the form of a parallelepiped, the abrasion of microtalon visually observed as black spots pyrocarbon at the intersection of the diagonals of large faces.

If there are bumps for 2 min experiment black spots are not detected, and the decrease in sample mass was less than 0.1 g (limit of sensitivity of the weights). It should be added that all the experiments were carried out in the reactors, will the United Plexiglas at room temperature with argon as siraudeau gas. Add that reducing the size of the bumps leads to weak abrasion particles, increasing the stability of rotation of the toroid.

Thus, the proposed device allows to increase the stability of the aggregate particles in the chemical reactor and thereby to prevent release of particles, which are applied coating.

1. Device for deposition in the fluidized bed containing the chemical reactor and the feed system it fluidizing gas, wherein the chemical reactor is designed as a straight parallelepiped with rounded edges and a base in the form of a rectangle, with one side face of the reactor has the shape of a square and the other side face, the shape of a rectangle, the area of which is equal to the area of the base, the ratio between the areas of the lateral faces is 1:(1.8 to 2), and rectangular faces at the intersection of the diagonals provided with protuberances.

2. The device according to p. 1, wherein the bump is made in the form of a dome with a diameter and height components respectively of 0.2-0.3 and 0.1-0.2 sides of the square.



 

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FIELD: chemistry.

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EFFECT: reduction of anisotropy coefficient of coating, precipitated from pyrocarbon.

4 ex

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41 cl, 7 dwg, 8 ex, 1 tbl

FIELD: nanotechnologies.

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FIELD: physics.

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12 cl, 9 dwg

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FIELD: chemistry.

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4 ex

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FIELD: chemical industry; food industry; pharmaceutical industry; other industries; methods of deposition of coatings on the particles of the bulk materials.

SUBSTANCE: the invention is pertaining to the method of deposition of coatings on the particles of the bulk materials and may be used in chemical, food, pharmaceutical and other industries. The technical result of the invention is the increased efficiency and the improved quality of the product. The method of deposition of coatings on the particles of the bulk materials provides for the coating melt atomization of a melt of cover by the gas heated above the fusion point of the coating material into the liquated layer of the particles of the bulk material. The bulk material preliminary is heated up to the temperature of 0.5-0.6 of the fusion points of the coating material by the flow of the fluidizing agent. At dosage of the melt the temperature in the liquefied layer of the bulk material makes no more than 0.6-0.8 of the temperature of the coating materials fusion points. After termination of the batching of the melt conduct the gradual reduction of the temperature of the layer of the material up to the temperature of the environment.

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3 cl, 1 ex

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1 cl, 1 dwg

FIELD: the invention refers to application of covers in a liquefying layer particular to an arrangement for settling covers in a liquefying layer.

SUBSTANCE: the arrangement for settling covers in a liquefying layer has a chemical reactor of a cylindrical form and a system of feeding with liquefiable gas, the inner surface of the cylindrical reactor is provided with vertical grooves located on ribs of regular polygons inscribed into the inner diameter of the reactor. At that the number of grooves is chosen in the limits 3-20, the grooves in the section have a form of an equilateral triangle and for a reactor with a diameter of 20-100 mm the relation of squares of transversal sections of the reactor and of all grooves is in the limits 100-200.

EFFECT: the invention provides stability of a liquefying layer at essential increasing of the particles' mass in the process of applying a cover.

1 cl, 1 dwg

FIELD: chemical industry; food industry; pharmaceutical industry; other industries; methods of deposition of coatings on the particles of the bulk materials.

SUBSTANCE: the invention is pertaining to the method of deposition of coatings on the particles of the bulk materials and may be used in chemical, food, pharmaceutical and other industries. The technical result of the invention is the increased efficiency and the improved quality of the product. The method of deposition of coatings on the particles of the bulk materials provides for the coating melt atomization of a melt of cover by the gas heated above the fusion point of the coating material into the liquated layer of the particles of the bulk material. The bulk material preliminary is heated up to the temperature of 0.5-0.6 of the fusion points of the coating material by the flow of the fluidizing agent. At dosage of the melt the temperature in the liquefied layer of the bulk material makes no more than 0.6-0.8 of the temperature of the coating materials fusion points. After termination of the batching of the melt conduct the gradual reduction of the temperature of the layer of the material up to the temperature of the environment.

EFFECT: the invention ensures the increased efficiency and the improved quality of the products.

3 cl, 1 ex

FIELD: process engineering.

SUBSTANCE: invention relates to production of construction materials. Proposed method comprises application of dye powder on processed article and heat treatment. Protective decorative coating is performed in two layers. First layer is primer to be applied without preliminary heating. Second layer is made from polymer material and applied at temperature not exceeding 50 degrees Centigrade.Temperature of isothermal holding in heat-treatment chamber makes 175-205°C and 190-220°C. Holding time makes 10-25 min. Time of application of first and second layer makes 15-35 min.

EFFECT: higher density, adhesion strength, smooth surface, uniform layers.

5 cl

FIELD: chemistry.

SUBSTANCE: precipitation of pyrocarbon on fuel particles is carried out by supply of hydrocarbon and inert gas mixture into precipitation zone for time τ, increase of the total expenditure of gas mixture by 1.1-1.4 times in comparison with initial value. At time moment, equal τx=(0,45τ-0,55τ), supplied of hydrocarbon is stopped for 1-3 s, and in order to provide optimal mode of fluidisation of fuel particles, consumption of inert gas is increased by value, equal to the product of hydrocarbon consumption at time moment τx and ratio of hydrocarbon and inert gas molecular weights.

EFFECT: reduction of anisotropy coefficient of coating, precipitated from pyrocarbon.

4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to the field of obtaining pyrocarbon and carbide coatings in a fluidised bed (FB) of particles with a polyfractional composition, changing in the process of the coating precipitation, and can be used in nuclear and electronic equipment. A device for the coating precipitation in FB contains a chemical reactor and a system for the supply of fluidising gas in it. The chemical reactor is made in the form of a right parallelepiped with rounded edges and a rectangle-shaped base. One lateral face of the reactor has a square shape, another lateral face has a shape of a rectangle, whose area equals the area of the base. The ratio of areas of the lateral faces constitutes 1:(1.8-2), with the rectangular faces being provided with convexities in the places where diagonals cross.

EFFECT: increased stability of a totality of particles in the chemical reactor is provided which results in the prevention of a carryover of the particles, which the coating is applied on.

2 cl, 1 dwg

FIELD: metal science; protection of materials against external and corrosive attacks.

SUBSTANCE: proposed method for producing diamond-like films designed for encapsulating solar photocells to protect them against chemical, radiation, and mechanical damage includes variation of ion kinetic energy, plasma discharge current, and spatial density distribution of plasma incorporating C+, H+, N+, and Ar+ ions by acting upon ion current from radial source with electric field built up by stop-down, neutralizing, and accelerating electrodes. Spatial plasma distribution is checked for uniformity by measuring plasma current density on solar photocell surface whose temperature is maintained not to exceed 80 oC. In the process substrate holder makes complex axial movement in three directions within vacuum chamber. Diamond-like films produced in the process on solar photocell surface area over 110 cm2 are noted for uniformity, difference in their optical parameters variable within desired range is not over 5%.

EFFECT: enhanced adhesive property, microhardness, and resistance of films to corrosive attacks.

5 cl, 12 dwg, 2 tbl

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