RU2595074C2 - Method for producing decorative coatings on glass kremnezite - Google Patents

Abstract

FIELD: glass.

SUBSTANCE: invention relates to methods for producing decorative coatings on articles from glass, particularly on glass kremnezite. Method for producing decorative coating on glass kremnezite involves crushing and sieving of colored glass, glass powder fed into the plasma burner and plasma spattering. Glass powder is produced by particle size of 20-80 mcm by colored glass crushing and sieving, mechanical mixture of said glass powder and non-ferrous metal powder or alloy is obtained at a ratio of 1:1, obtained mixture is fed into a powder feeder of the plasmatron plasma burner, plasma sputtering is performed at plasmatron power of 9.0 kW and plasma-forming gas flow rate of 0.6 m³/min.

EFFECT: reduced power consumption higher quality of the end product with improved aesthetic-consumer properties of decorative coating.

1 cl, 2 tbl, 1 ex

Description

The invention relates to methods for decorative coatings on glass products, in particular on silica fume.

There is a method of producing glass silica fume with a fiery polished surface [Budov V.M., Sarkisov P.D. Production of building and technical glass. - M .: Higher school. - 1991. - 319 S.], including melting, sintering, partial crystallization and annealing with simultaneous surface polishing.

The disadvantage of this method is the low aesthetic and consumer properties of the decorative coating, the complexity of the process and the inability to obtain a multi-color coating, which reduces the competitiveness of the products.

A known method of producing decorative coatings on glass products [Immortal B.C., Krokhin V.P., Panasenko V.A., Dryzh N.A., Dyumin P.S., Kolgina OM Plasma core decoration of varietal tableware // Glass and Ceramics. 2001. No.6. P. 21-22], including the operation of manufacturing colored glass rods, an overlay on a stencil product, the introduction of rods into a plasma torch and plasma spraying.

The disadvantages of this method are the low productivity of the decoration process and the high energy intensity, and as a result, the high cost of the final product.

The closest solution to the proposed method according to the technical nature and the achieved result is a method of decorating glass and glassware by plasma spraying [Krokhin V.P., Immortal B.C., Panasenko V.A., Drizh N.A., Nikiforov V.M. Decoration of glass and products from it by plasma spraying // Glass and Ceramics. 1999. No. 3, p. 12-14], which consists in pre-grinding colored varietal glasses, sieving them in fractions of 80-250 mm, feeding the powder into a plasma torch, plasma spraying the glass powder on glass products.

The disadvantage of this method is the low aesthetic and consumer properties due to the low value of the coefficient of diffusion reflection (BWW), high energy intensity of the process and the relatively low quality of the decorative coating.

The technical result of the invention is to reduce the energy intensity of the process, improving the quality of the final product while improving the aesthetic and consumer properties of the decorative coating.

The technical result is achieved by the fact that a mechanical mixture of non-ferrous glass and non-ferrous metal powders in a ratio of 1: 1 is introduced into the plasma torch and plasma spraying is performed with a plasma torch operating power of 9.0 kW and a plasma-forming gas flow rate of 0.6 m ³ / min.

The inventive step is confirmed by the fact that a change in the method of preparation of the sprayed powder followed by plasma spraying on glass products, including glass silica fume, can significantly increase the BWW due to the high reflectivity of non-ferrous metals, as well as reduce the power of the plasma torch, since it melts the mixture sprayed glass powder with metal requires less energy than glass powder.

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

Example:

As starting materials, a fiberglass tile of standard sizes 300 × 300 × 15 mm was taken.

To obtain a decorative coating, PA-4 aluminum powder was taken in accordance with GOST 6058-73 with a specific surface of 0.008-0.10 m ³ / g, bulk density of 1050-1100 kg / m ³ with an impurity content of not more than 1.0 wt. %

For plasma spraying, glass “selenium ruby” was used with the following chemical composition (wt.%): SiO ₂ - 56.5; Al ₂ O ₃ - 0.5; Na ₂ O - 1.0; K ₂ O - 15.0; ZnO - 1.8; B ₂ O ₃ - 1.2; Cd - 0.5; Se is 0.5.

Glass “selenium ruby” was crushed and scattered on sieves. For plasma spraying, a fraction of 20-80 microns was used. Such a fraction melts faster than the fraction by a known method (80-250 mm).

In the proposed method, using a laboratory vane mixer, a mechanical mixture of aluminum powder and glass powder was obtained. This mixture was fed into a powder feeder of the UPU-3M electric arc plasmatron, and from it into the GN-5p plasma torch.

A glass-siliceous tile was installed on a plate conveyor with a speed of 0.15 m / s. The plasma torch used a special mechanism to reciprocate on a plate conveyor at a speed of 0.10 m / s.

The plasma torch operation parameters: operating voltage = 30 V, current = 300 A. Argon served as the plasma-forming gas, the flow rate of which was 0.6 m ³ / min.

The optimal parameters of plasma spraying are presented in table 1.

Under the influence of high temperatures, the GN-5p plasma torch rapidly melts the particles of glass powder and aluminum powder and coagulates with the formation of larger particles than the initial powders. Coagulated particles consisting of a melt of aluminum with glass, 100-150 microns in size, in the process of plasma spraying collided with a substrate with newly dusted layers. In the contact zone, diffusion processes of the metal occurred in the heated glass of the substrate (glass silica fume). This provided a higher adhesion strength of the coating to the substrate than in the known method.

Composite coating based on selenium ruby and aluminum had a higher BWW than in known methods. This significantly increases the aesthetic and consumer properties of glass-silica-decorative with decorative coating and its competitiveness.

After plasma spraying, the glass-silica-cement tile was removed from the plate conveyor, and the quality and durability of the product were controlled. The durability and reliability of the coating is characterized by the adhesion of the coating to the base. The quality indicators of glass-silica with decorative coating are presented in table 2.

Quality control example:

To determine the adhesion strength of the coating to the base, a metal rod 150 mm long and 1 cm ^{2 in} area was glued to the front surface with an epoxy resin. After polymerization of the epoxy resin for 24 hours, we proceeded to determine the adhesion strength to the substrate on an R-0.5 tensile testing machine.

The product and the rod were fixed in special clamps of the tensile testing machine R-0.5. After uniform loading, the coating detached from the base. For testing, 5 samples were taken.

The adhesion strength of the decorative coating was determined as the arithmetic mean:

δ _rz. = (13.8 + 14.5 + 15.0 + 15.5 + 16.2) / 5 = 15.0 MPa.

For plasma spraying, the proposed method involves the use of such powders of metals and alloys, such as aluminum, copper, bronze, brass. These metals and alloys have a high BWW.

Claims (1)

A method of obtaining a decorative coating on glass silica fume, including grinding and sieving colored glass, feeding the glass powder into a plasma torch and plasma spraying, characterized in that the glass powder is obtained in a particle size of 20-80 μm by grinding colored glass and dispersion on the sieves, then a mechanical mixture of the above glass powder is obtained and non-ferrous metal or alloy powder at a ratio of 1: 1, the resulting mixture is fed into a powder feeder of a plasma torch of a plasma torch, and plasma spraying is carried out at the power of the plasma torch is 9.0 kW and the plasma gas flow rate is 0.6 m ³ / min.