RU2458872C1 - Method of producing coatings on blocked foam glass - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to producing coatings on blocked foam glass. Glase powder is fed by a powder feeder into the plasma burner of a plasmatron. Plasma sputtering of the glase onto the front surface of the blocked foam glass is carried out. Plasma sputtering of the glase powder is carried out at plasmatron power of 10 kW, speed of propagation of the plasma burner of 0.1 m/s and glase powder consumption rate of 3.00-3.25 g/s.

EFFECT: high coating quality, faster process of obtaining coating and low power consumption.

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Description

The invention relates to the field of producing coatings on block foam glass and can be used in the building materials industry.

Currently, there are a number of methods for producing coatings on block foam glass, the main of which are single-stage and two-stage.

A known method of manufacturing foams, including obtaining coatings on the front surface of a block of foam glass from a mixture of 98.9 wt.% Battle of container glass; 0.2 wt.% Chalk and 1.0% silicate overglaze paint [1] [AC 1604767. A method of manufacturing foams. Krasko K.F., Rozhkov V.A., Hainovskaya T.S., Demidovich B.K. From 11/07/90. Byul.41]. However, despite the good quality of the final product, the method has the following disadvantages: high energy intensity of the process, low productivity due to joint additional grinding of the charge components; a time-consuming technological operation of laying a coating layer of a charge 2 mm thick and, as a result, the high cost of the final product.

The closest technical solution is a method for producing coatings on block foam glass, including applying glaze powder on the front surface of block foam glass and melting in a muffle furnace when the temperature rises to 750 ° C for 250 min [2] (p.146) [Foam glass. Scientific fundamentals and technology [text]: monograph / N.I. Minko, O.V. Puchka, B.C. Immortal, S.V. Semenenko, V. B. Krakht, R. G. Melkonyan. - Voronezh: Scientific book, 2008. - 168 p. (p.143-146)].

The disadvantages of this method are the duration, complexity and energy consumption of the process, as well as the relatively low quality of the coating [2] (p. 147) [Foam glass. Scientific fundamentals and technology [text]: monograph / N.I. Minko, O.V. Puchka, B.C. Immortal, S.V. Semenenko, V. B. Krakht, R. G. Melkonyan. - Voronezh: Scientific book, 2008. - 168 p. (p.143-146)].

The aim of the proposed method is to improve the quality of the final product, accelerate the process of obtaining coatings, reduce the energy intensity of the process and, as a result, obtain high-quality competitive products.

This goal is achieved by the fact that the glaze powder is fed by a powder feeder into the plasma torch and plasma spraying of the glaze powder is carried out at a plasma torch power of 10 kW, the plasma torch has a velocity of 0.1 m / s on the surface of the block foam glass and a powder flow rate of 3.00-3.25 g / s

A distinctive feature of the proposed method is the plasma spraying of glaze powder on the front surface of block foam glass. As a result, the speed of obtaining coatings on block foam glass is increased, the complexity and energy consumption of the process are reduced, and the quality of the final product is increased.

The inventive step is confirmed by the fact that the supply of the powder by the powder feeder to the plasma torch of the plasma torch and the plasma spraying of the glaze powder on the front surface of the block foam glass allows not only to obtain a high-quality final product, but also to reduce the time for obtaining the coating, as well as reduce energy consumption.

The analysis of the known methods for producing coatings on block foam glass allows us to conclude that the claimed invention meets the criterion of "novelty."

The optimal conditions for producing coatings on block foam glass, experimentally obtained, are a plasma torch power of 10 kW at a plasma torch passage speed of 0.1 m / s and a glaze powder flow rate of 3.00-3.25 g / s (Table 1 and Table 2) .

Table 1 Optimal plasma spraying parameters and coating quality indicators No. p / p Power of plasma torch, kW The consumption of plasma-forming gas, m ³ / hour The speed of plasma processing, m / s Adhesion Strength, MPa one 8 2.5 0.04 0.33 0.06 0.37 0.08 0.41 0.10 0.47 0.12 0.42 2 9 2.5 0.04 0.37 0.06 0.39 0.08 0.43 0.10 0.49 0.12 0.45 3 10* 2.5 0.04 0.41 0.06 0.45 0.08 0.48 0.10 * 0.52 * 0.12 0.49 four eleven 2.5 0.04 0.39 0.06 0.41 0.08 0.46 0.10 0.50 0.12 0.47 * - optimal mode

table 2 The effect of the consumption of glaze powder on the quality of the coating (power 10 kW, plasma processing speed 0.10 m / s) No. p / p Glaze powder consumption, g / s Coating Condition (visual) Porosity (spot method) one 2.00 Tuberous Porous 2 2,50 Tuberous Porous 3 2.75 Flat spill Porous four 3.00 * Flat spill Non-porous 5 3.25 * Flat spill Non-porous 6 3,50 Sagging Non-porous 7 3.75 Sagging Porous * - optimal consumption of glaze powder

Example: Obtaining a plasma spray coating.

To obtain the coating used block foam glass (prototype) 60 × 60 × 15 mm Block foam glass was placed on a plate conveyor, the speed of which was 0.10 m / s.

A plasma torch GN-5r of an electric arc plasma torch UPU-8m was stationary installed above the plate conveyor. The parameters of the plasma torch were as follows: power 10 kW, plasma-forming gas flow rate 2.5 m ³ / h. Powder of blue cobalt glass with a grain composition of 80-150 μm was used as a glaze powder. Glaze powder was poured into the powder feeder of the UPU-8m plasma torch and plasma spraying was performed on the front surface of the block foam glass.

After plasma spraying of the glaze powder, the quality indicators of the final product were determined.

Comparative data of quality indicators, technological parameters and operations of the proposed and known methods are presented in table.3.

An example of quality control.

To determine the adhesion strength of the glaze layer to the base, a metal rod 150 mm long and 1 cm ² in area was glued to the surface with epoxy resin.

After polymerization of the epoxy resin for 24 hours, we proceeded to determine the adhesion strength of the coating to the base on a tensile testing machine K-0.5. Products and the rod were fixed in special clamps of the tensile testing machine. After uniform loading, the coating peeled off. At least 5 samples were taken for testing.

The adhesion strength of the coating to the base was determined as the arithmetic average of five measurements (with the optimal plasma spraying mode):

Porosity was determined by the "spot" method. Test results showed that the coating is non-porous.

Table 3 Quality indicators of coated block foam glass, technological parameters and operations No. p / p Indicators Units rev. The proposed method The known method [2] one Process flow Glaze powder supply by a powder feeder to a plasma torch Application of glaze powder on the front surface of block foam glass ↓ ↓ Plasma spraying Reflow ↓ ↓ Quality control Quality control 2 Dimensions of block foam glass mm 60 × 60 × 15 60 × 60 × 15 3 Glaze Consumption g / s 3.00-3.25 - four Grip strength MPa 0.52 - 5 Coating quality Flat spill The surface is deformed, surface tears 6 Energy costs: - heating and holding time min - 150-410 - max temperature ° C - 750 - power of the plasma torch kw 10 - 7 The duration of the process: - processing speed m / s 0.10 - - heating time to 750 ° C min - 250 - heating rate ° C / min - 12.9

Claims (1)

A method for producing coatings on block foam glass, comprising applying glaze powder to the front surface of block foam glass, melting it and controlling the quality of finished products, characterized in that the glaze powder is fed by a powder feeder to the plasma torch of a plasma torch and plasma spraying of the glaze powder is carried out with a plasma torch power of 10 kW and a plasma torch travel speed of 0.1 m / s and a glaze powder flow rate of 3.00-3.25 g / s.