RU2565296C1 - Method to produce rods for production of glass-metal microballs - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: in the method to produce rods intended for production of microballs they use glass tubes with diameter of 2-4 mm, one end of which is sealed with paraffin, a mixture of glass powder and power of at least two metals. Then the second end is soldered, and treated with a plasma torch at temperature of 7000-9000 K.

EFFECT: increased quality of rods, reduced labour intensiveness of manufacturing, possibility to use two and more metals.

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Description

The invention relates to the field of production of rods for the manufacture of composite glass-metal microspheres, which can be used in road construction as reflective elements of road marking.

A known method of producing rods for producing microspheres, including weighing and mixing the components of the mixture, mixing with PVA glue in a ratio of 10: 1 (weight parts), followed by molding and drying [V. Krokhin, Immortal BC, O. V. Puchka, Nikiforov V.M. The synthesis of yttrium aluminum glasses and minerals // Glass and Ceramics, 1997, No. 9, p. 6].

The closest technical solution is a method for producing rods for producing glass-metal microspheres, including preliminary grinding and sieving of glass powder into fractions of 50-100 microns, preparation of plastic paste, forming into a metal wire paste and drying [RF Patent 2455118. Immortal BC, Simachev A.V. , Dyumina P.S. et al. B22F 9/06; C03B 9/00, submission date - 05.24.2010, publication date - 10.07.2012].

The disadvantages of this method of producing rods are their low quality, the complexity of manufacturing, the use of only one type of metal, significant losses from marriage when entering the rods into a plasma torch upon receipt of glass-metal microspheres. So, according to the patent of the Russian Federation No. 2455118, when the rods are introduced into the plasma torch, self-peeling of the coated paste on a metal wire can occur, which subsequently does not allow to obtain glass-metal microspheres.

Significant laboriousness is the technological operation of molding metal wire into a paste.

The objective of the invention is to create a method for producing rods for the production of glass-metal microspheres, by using which the quality of the rods will increase, as a result of which there will be no losses from rejects, the labor input of manufacture will decrease, and it will be possible to use two or more metals.

The problem is solved due to the fact that in the proposed method for the manufacture of rods designed to produce glass-metal microspheres, glass tubes with a diameter of 2-4 mm are used, which are filled with a mixture of glass powder and powders of at least two metals in a ratio of 2: 1: 3, then the second end the tubes are sealed with paraffin and treated with a plasma torch at a temperature of about 7000-9000 K.

The technical effect of the invention is to improve the quality of the rods, reduce the complexity of manufacturing, eliminate losses from marriage and the ability to use two or more metals.

Thus, the main distinguishing feature of the present invention is the use in plasma spraying of glass tubes with a diameter of 2-4 mm, pre-filled with a mixture of glass powder and powders of at least two metals.

The inventive step is confirmed by the fact that the change in the composition of the rods, in particular the lack of the use of a binder in comparison with the known method, the use of tubes and powders of two or more metals, allows to obtain high-quality rods for plasma spraying, to reduce rejects during plasma spraying and to reduce the complexity of manufacturing rods due to eliminate the time-consuming operation of molding a metal wire into a paste.

The analysis of the known methods for producing rods for the production of glass-metal microspheres allows us to conclude that the claimed invention meets the criterion of "novelty."

A comparative analysis of the technological operations of the known and proposed methods allowed us to determine the novelty of the latter (table 1).

Thus, in the known method, labor-intensive and time-consuming technological operations are required for mixing the glass powder with a binder additive and applying the glass powder paste on the surface of a metal wire. In the proposed method, these technological operations are absent. In the known method, in the process of subsequent technological drying of the rods, internal stresses are formed in them at the metal-paste interface.

This can lead to bending of the rods and self-peeling of the paste from the metal wire.

In the proposed method due to the use of glass tubes, this disadvantage is eliminated.

One of the distinguishing features of the proposed method is a fundamentally new technological operations of filling glass tubes with a mixture of glass powder with powders of at least two metals.

The composition and quality indicators of the rods of the known and proposed manufacturing methods are presented in table 2.

As can be seen from the table. 2, the recommended diameter of the glass tube is 2-4 mm. When using a glass tube of less than 2 mm, the operation of filling it with a mixture of glass powder and metal powders is time-consuming and time-consuming.

When using a glass tube more than 4 mm in the subsequent plasma spraying of the rods, a significant number of substandard microspheres are formed.

Example 1

The starting material was a sheet glass battle, which was ground in a 10 L ball china mill and dispersed on sieves with fractions of 50-100 μm.

Depending on the goals, objectives and necessary properties of glass-metal microspheres, it is recommended to add a certain amount of metal powders to the glass powder.

In this particular case, glass powder, aluminum powder of grade PA4 and copper powder of grade M1 were taken and mixed in a laboratory paddle mixer in a ratio of 2: 1: 3 (weight parts).

Then they took a glass tube 300 mm long and 3 mm in diameter, sealed one end of the tube with paraffin, filled it with a mixture of glass powder and aluminum and copper powders and sealed the second end of the glass tube with paraffin.

Example 2

The starting material was taken from a battle of blue cobalt glass, which was ground in a 10 L ball china mill and dispersed on sieves at a fraction of 50-100 μm.

The glass powder of blue cobalt glass was mixed with aluminum powder of the ADS-4 brand and powder of the brass of the L-1 brand in a ratio of 2: 1: 3.

Then they took a glass tube 250 mm long with a diameter of 2 mm, sealed one end of the tube with paraffin, filled it with a mixture of glass powder, aluminum and brass powders and sealed the second end of the tube with paraffin.

Example 3

The starting material was a battle of green chrome glass, which was ground in a 10 L ball china mill and dispersed on sieves into fractions of 50-100 μm.

The glass powder of green chrome glass was mixed with aluminum powder of the ADS-4 brand and copper powder of the M-1 brand at a ratio of 2: 1: 3.

Then they took a glass tube 300 mm long and 4 mm in diameter sealed one end of the tube with paraffin, filled with a mixture of glass powder, aluminum, copper and zinc powders, sealed the second end of the tube with paraffin.

Due to the high temperatures of the plasma torch, of the order of 7000-9000 K, with the subsequent use of the rods to obtain glass-metal microspheres, paraffin burned out.

The rods for producing glass-metal balls were obtained for the first time and have no analogues in world practice.

Claims (1)

A method of producing rods for producing glass-metal microspheres, including grinding glass, sieving glass powder into fractions, characterized in that glass rods with a diameter of 2-4 mm are used to obtain the rods, one end of which is sealed with paraffin, filled with a mixture of glass powder and powders of at least two metals in the ratio 2: 1: 3, then the second end of the tubes is sealed with paraffin and treated with a plasma torch at a temperature of about 7000-9000 K.