RU2832900C1 - Charge for producing glass light-reflecting spherical materials - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: proposed invention relates to development and production of mixture for obtaining glass light-reflecting spherical materials (glass-metal microspheres) and can be used in road construction, electronics, biotechnology, as well as in jewellery industry. Mixture for producing glass light-reflecting spherical materials includes metal and glass-containing components. Aluminium powder is used as metal component. Glass-containing component is represented by finely dispersed scrap glass powder at ratio of 1:3 wt.pts. respectively, the mixture additionally contains water to moisture content of 7-9%.

EFFECT: improved quality of light-reflecting spherical materials (glass-metal microspheres).

1 cl, 2 tbl, 1 ex

Description

The invention relates to the development and production of a batch for obtaining glass reflective spherical materials (glass-metal microspheres) and can be used in road construction, electronics, biotechnology, and also in the jewelry industry.

The compositions of the batch for obtaining glass reflective spherical materials (glass-metal microspheres) are known, the disadvantage of which is the low quality of the finished product.

The closest technical solution adopted as a prototype is the composition of the batch for obtaining glass-metal microspheres, described in the patent (Patent of the Russian Federation No. 2455118), which includes a metal component of copper and aluminum in the form of wire, crushed glass and a binding additive. The disadvantage of this composition is the low quality of the finished product.

The technical result of the proposed invention consists in improving the quality indicators of reflective spherical materials (glass-metal microspheres).

The technical result is achieved in that the batch for obtaining glass reflective spherical materials includes metallic and glass-containing components, wherein aluminum powder is used as the metallic component, and finely dispersed glass cullet powder is used as the glass-containing component in a ratio of 1:3 parts by weight, respectively, in addition, the mixture additionally contains water to a humidity of 7-9%.

The proposed batch differs from the prototype in that aluminum powder is used as the metal component, and finely dispersed cullet powder is used as the glass-containing component in a ratio of 1:3 parts by weight, respectively; in addition, the mixture additionally contains water to a humidity of 7-9%.

A comparative analysis of the proposed and known methods is presented in Table 1.

Table 1

Comparative analysis of the known and proposed methods and quality indicators

Well-known raw material mixture,
(Patent of the Russian Federation No. 2455118
"Glass-metal microspheres and the method for their production") The proposed raw material mixture The raw material mixture consists of a metal component of copper and aluminum in the form of wire, crushed glass, and a binding additive.

Mixing glass powder with a binding additive in a ratio of 10:1 and grinding together

Application of glass powder paste with a binding additive to the surface of a metal wire, followed by drying

Spraying rods in a plasma torch

Production of glass-metal microspheres ∅ 0.3-1.1 mm The raw material mixture consists of aluminum powder and finely dispersed broken glass powder in a ratio of 1:3, respectively.

Mixing of mixture components and averaging

Granulation of the batch to the size
granules 2-4 mm

Melting of the charge in a plasma torch with the formation of spherical molten particles

Obtaining glass-metal microspheres
∅ 0.4-3.0 mm Diffuse reflectance coefficient
72-75% Diffuse reflectance coefficient 84% Percentage of defects
8-10% Percentage of defects
1.4%

As can be seen from Table 1, in the prototype, when rods based on metal wire and ground glass paste and a binding additive are introduced into the plasma torch, intensive melting of the composite occurs, which contributes to the formation of up to 10% of defects in the form of "beads", a characteristic known from literary sources, in particular Demidenko, L.M. Highly refractory composite coatings: monograph. - M .: Metallurgy, 1979. - 216 p. In addition, the known raw material mixture and technology for producing glass-metal microspheres (prototype, Russian Federation Patent No. 2455118) does not allow for uniform distribution of metal particles in the glass melt, which reduces the quality indicators of the finished product compared to the proposed technology. In the proposed technology, during the preparation of the granulated batch, metal particles are uniformly distributed throughout the volume, which increases the diffuse reflection coefficient to 84% and, as a result, increases the quality indicators of the glass-metal microspheres.

Characteristics of components

1. Crushed sheet glass of the following chemical composition (mass%): _SiO2 - _72.0 ; _Na2O - 14.5; CaO - 6.8; _Al2O3 - 3.2; MgO - 3.4; _Fe2O3 - _0.05 ; _SO3 - 0.5.

2. Aluminum powder (GOST - 6058-2022).

3. Water (GOST 17.1.1.04-80).

Aluminum powder 25% and finely dispersed glass powder with a humidity of 7-9% were averaged in a mixer for 10 minutes. The charge was granulated in a laboratory granulator to obtain granules of 2-4 mm. The granules were placed in a powder feeder of an electric arc plasma torch UPU-8m. The arc was ignited and the plasma-forming gas argon and charge were fed into the plasma torch at a flow rate of 3.5 g/s.

In a plasma torch with an average mass temperature of the plasma torch of 6500°C, instantaneous melting of the charge occurs with the formation of spherical molten particles. Under the influence of the outgoing plasma-forming gas argon, the particles were transformed into the accumulator zone, where they were cooled and accumulated in the receiving collector.

The obtained samples were then analyzed. The results of the studies are presented in Table 2.

Table 2

Qualitative characteristics of the obtained samples of glass-metal microspheres

Ratio of copper powder to cullet, % Diffuse reflectance coefficient (DRC), % Percentage of defects, % aluminum broken glass 35 65 78 2,3 25* 75* 84* 1.4* 20 80 79 2.6 * - the best option

The amount of perfectly spherical particles of glass-metal microspheres with a size of 0.4-3 mm µm was 98.6%.

The diffuse reflection coefficient, carried out on the POS-1 device using the standard method, was 84%.

Example

Aluminum powder 0.25 kg and glass powder finely ground in a ball mill 0.75 kg were moistened to 6%, averaged in a laboratory mixer for 10 minutes. The charge was granulated in a laboratory granulator to obtain granules of 2-4 mm. Granules were placed in a powder feeder of the electric arc plasma torch UPU-8m. The arc was ignited and plasma-forming gas argon and charge were fed into the plasma torch at a flow rate of 3.5 g/s.

In a plasma torch with an average mass temperature of the plasma torch of 6500°C, instantaneous melting of the charge occurred with the formation of spherical molten particles. Under the influence of the outgoing plasma-forming gas argon, the particles were transformed into the accumulator zone, where they were cooled and accumulated in the collector.

The number of ideal spherical particles of glass-metal microspheres measuring 0.4-30 mm was 98.6%, the number of defects was 1.4%.

The diffuse reflection coefficient, carried out on the POS-1 device using the standard method, was 84%.

Thus, with the developed composition of the batch for obtaining glass-metal microspheres, high-quality glass-metal microspheres were obtained, with a low amount of defects, without the use of any additional binding components.

Claims (1)

A charge for obtaining glass reflective spherical materials, including metallic and glass-containing components, characterized in that aluminum powder is used as the metallic component, and finely dispersed glass cullet powder is used as the glass-containing component in a ratio of 1:3 parts by weight, respectively; in addition, the mixture additionally contains water to a moisture content of 7-9%.