RU2591909C1 - Method of glass cremnezite metallization - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to methods of metal coating of various articles from glass cremnezite, including construction materials. Method involves preliminary application of intermediate layer on front surface of the article from glass cremnezite, plasma sputtering of coating from metals or alloys and quality control, wherein intermediate layer is applied from paste consisting of a mixture of metal powder, liquid glass and finely ground glass powder in weight ratio 2:1: 2 respectively, and plasma sputtering of metal is carried out at plasmatron operating power of 4.0 kW and plasma-forming gas flow rate of 0.6 m³/min.

EFFECT: technical result is reduction of stresses in substrate and coating with high adhesion strength of coating with substrate.

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Description

The invention relates to methods for metallization of various products, including building materials.

The prior art method for metallization of concrete products [Fedosov S.V., Akulova M.V. Plasma metallization of concrete. - M.: DIA. 2003. 122 S.], including sandblasting the front surface and subsequent plasma spraying of a wire of aluminum, zinc, copper and nichrome.

The disadvantage of this method is the low adhesion strength of the coating to the substrate, the duration of the process and its high energy intensity.

The closest solution to the proposed method according to the technical essence and the achieved result is the “Method of wood metallization”, RF patent No. 2509826, which consists in pretreating the wood surface with a layer of liquid glass, powdering aluminum powder and plasma spraying of metals and their alloys with compressed air.

The disadvantage of this method is the high energy intensity and low quality products.

The technical result of the invention is to reduce the stresses in the substrate and the coating while increasing the adhesion strength of the coating to the substrate.

The technical result is achieved by the fact that the method of metallization of glass-silica fume, including preliminary applying an intermediate layer to the front surface of the material, plasma spraying of metals and alloys, quality control, and the intermediate layer is a paste prepared from a mixture of metal powder, liquid glass and finely ground glass powder in a mass ratio 2: 1: 2, respectively, and plasma metal deposition was carried out with a plasma torch operating power of 4.0 kW and a plasma-forming gas flow rate of 0.6 m ³ / mi n

A distinctive feature of the proposed method is the preparation of a paste from a mixture of metal powder, liquid glass and finely ground glass powder in a mass ratio of 2: 1: 2, respectively, applied as an intermediate layer on the front surface of the material.

In the proposed method, the preliminary deposition of a layer of a mixture of metal powder, liquid glass and finely ground glass powder helps to reduce stresses in the coating and substrate, compensates for significant differences in the values of the thermal coefficient of linear expansion of fiberglass and metals, which allows to obtain high-quality material without internal stresses, reduce the process and simplify the metallization method, as well as reduce energy intensity.

The analysis of the known methods of metallization of products allows us to conclude that the claimed invention meets the criterion of "novelty."

Glass metallization example

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

In a laboratory mixer, a paste was prepared from aluminum powder PA-4 according to GOST 6058-73, sodium liquid glass, and finely ground container glass powder in a mass ratio of 2: 1: 2, respectively. With this ratio of components, the paste fits well. A paste with a thickness of 2-3 mm was applied to the front surface of the glass-siliceous and compacted with a rubber roller.

For plasma spraying, aluminum wire ⌀ 1.5 mm grade AD-1 (GOST 7871-63) and copper wire ⌀ 1.0 mm grade M 1 (GOST 2112-62) were used.

The prepared glass-silica-cement tile was fixed in a device for the mutual movement of the tiles and the plasma torch GN-5r of the UPU-3M electric arc plasmatron. The spraying distance was 120-150 mm. Argon grade A (GOST 19157-62) was used as a plasma-forming gas.

For the above example, the following modes of operation of the electric arc plasmatron were selected: current = 133 A; voltage = 30 V (Power W = 133 * 30 = 3999 W ≈ 4.0 kW).

We determined the optimal parameters of the plasma metallization of glass-siliceous, at which the maximum strength of the coating with the base is achieved (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 of the glass-silica-cement. After polymerization of the epoxy resin for 24 hours, we proceeded to determine the adhesion strength of the coating to the tensile strength in the machine R - 0.5.

The product and the rod were fixed in special clamps of the tensile testing machine. After uniform loading, the coating detached from the base. At least 5 samples were taken for testing. The adhesion strength of the coating to the base was determined as the arithmetic mean:

δ _pg = (2.5 + 2.4 + 2.6 + 2.8 + 2.7) / 5 = 2.6 MPa.

Claims (1)

A method of metallization of glass-silica-silicite, including preliminary application of an intermediate layer on the front surface of the material, plasma spraying of a coating of metals or alloys and quality control, characterized in that the intermediate layer is applied from a paste consisting of a mixture of metal powder, liquid glass and finely ground glass powder in a mass ratio of 2 : 1: 2, respectively, and plasma spraying of the coating is carried out at a plasma torch power of 4.0 kW and a plasma-forming gas flow rate of 0.6 m ³ / min.