SU1368599A1 - Method of manufacturing lining member - Google Patents

Abstract

The invention relates to the hardening of parts used under conditions of abrasive wear and elevated temperatures, in particular, the details of the lining of blast furnaces, which represent a wear-resistant component enclosed in a metal shell. The purpose of the invention is to increase the wear resistance of elements and the productivity of their manufacture by carrying out non-cement items. With a two-stage pressure treatment in a hot state. At the first stage, heating to 300-350 ° C is carried out at a rate of 10-30 degrees / min and squeezing with a force (2-4). The mode is selected based on the condition of maximum reactivity of the filler particles, the strength of the shell and the uniform distribution of the wear-resistant. particles in the alloy-bond. At the second stage, the part is heated until the alloy-binder is melted at a speed of 30-100 deg / min and squeezed with a force (1-5). The mode is selected from the conditions for eliminating the diffusion of hydrogen into the volume of the lining element, eliminating porosity and ensuring uniform distribution of the wear resistant particles. The method allows to obtain lining elements of stable quality with high relative wear resistance. 1 dw., 3 tab. with b (L

Description

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The invention relates to the field of the strengthening of parts operated by the E conditions of abrasive wear and high temperatures, in particular the details of the cladding of the working part of blast furnaces with wear-resistant lining elements.

The aim of the invention is to increase productivity while simultaneously increasing the wear resistance of the elements.

The essence of the method is that the steel sheath filled with the wear-resistant component and alloy-bonded steel shell is heated to 300-350 ° C (; 10-30 degree / min., Deformed by force (2-4), after which the newer is heated to melting the alloy binder at a rate of about -100 degrees / min and finally deforming with a force of (1-5) 10 Pa.

The proposed method allows the manufacture of lining elements.

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As a result, the particles of the alloy-binder and the wear-resistant component come into contact. Due to the simultaneous effect of the displacing force and chemical decomposition in the lining element, the concentration of undesirable impurities is reduced.

The magnitude of the applied force is within (2-4). When the force is below 2-10 Pa, the density is unsatisfactory, and above 4-10 Pa an uneven distribution of hard and soft particles (wear-resistant alloy-bond) occurs.

Full consolidation of the wear-resistant alloy is achieved by increasing the temperature of the lining element to the melting point of the alloy-binder. The temperature rise is carried out at a speed of 30-100 degrees / min. At a speed of rise below 30 degrees / min, conditions arise for the diffusion of an acidic geometric shape with a high 25 degrees of air into the lining volume.

The increase in speed podje1 |

The drawing shows the lining element.

The lining element consists of a steel shell 1, in which the wear-resistant component 2 and the alloy-bond 3 are implied.

When the element is heated to 300 ° C and 50 ° C, protective films of oxide-hydroxide character are formed, which form on the surface of the materials under atmospheric conditions. It was established experimentally that the most intensive decomposition occurs at t 280 ° C and is accompanied by | TC sharply increases the reactivity of the surface of the particles of the powdered material due to an increase in surface concentration. defects. When heated, there is a transition of hydroxide to oxide. The formation of an oxide film leads to an increase in the concentration of defects. The temperature rise rate is 10-30 degrees / min. At rates of elevation of temperature below 10 ° C, there occurs: diffusion of gases to the surface of the powder material, and above — destruction of its shell.

After heating, the lining element is pre-deformed, at which the initial primary stage of protection against diffusion processes begins, in

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element,

above 100 degrees / min is undesirable due to an increase in internal stresses in the volume of the finished 30 lining element.

The final deformation of the lining element is produced by force (1-5). By applying less, the element has an increased porosity, and a force above 5 to 10 Pa increases the uneven distribution of solid (center) and soft (edge) particles.

The proposed method allows the range of unified lining elements to be significantly expanded due to the lack of technological limitations associated with shaping.

Example. The shell of a lining element having one open end S dimensions in cross section and 120x25x5 mm and a length of 1000 mm was filled with a mixture of powders of a wear-resistant component and an alloy-binder with different materials with a wear-resistant component. The open end of the filled shell was closed with a paper plug and subjected to compression to complete contact of the opposite walls. Heated the element in the furnace and subjected to compression on a press, after which it was again heated to 1100 ° C and finally deformed the sample. After chilled 45

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As a result of which the particles of the alloy-bind and wear-resistance come into contact; which component. Due to the simultaneous effect of displacing force and chemical decomposition in the lining element, the concentration of undesirable impurities is reduced.

The amount of force applied is within (2-4). When the force is below 2-10 Pa, density is unsatisfactory, and above 4-10 Pa an uneven distribution of hard and soft particles occurs (wear-resistant alloy-bond component).

Full consolidation of the wear-resistant alloy is achieved by increasing the temperature of the lining element to the melting point of the alloy-binder. The temperature rise is carried out at a speed of 30-100 degrees / min. I When the lifting speed is lower than 30 degrees / min, conditions for diffusion of acid increase.

0

element,

above 100 degrees / min is undesirable due to an increase in internal stresses in the volume of the finished 0 lining element.

The final deformation of the lining element is produced by force (1-5). By applying less, the element has an increased porosity, and a force above 5 to 10 Pa increases the uneven distribution of solid (center) and soft (edge) particles.

The proposed method allows to significantly expand the range of standardized lining elements due to the lack of technological limitations associated with shaping.

Example. The shell of a lining element having one open end S dimensions in cross section and 120x25x5 mm and a length of 1000 mm was filled with a mixture of powders of a wear-resistant component and an alloy-binder with different materials with a wear-resistant component. The open end of the filled shell was closed with paper wad and subjected to compression to complete contact of the opposite walls. Heated the element in the furnace and subjected to compression on a press, after which it was again heated to 1100 ° C and finally deformed the sample. After cool5

0

five

nor received lining element | cut on an electroerosive machine and subjected to complex comparative tests,

In tab. I indicates the composition of the components used to manufacture the sample elements.

In tab. 2 shows the modes used.

In tab. 3 shows the results of testing samples.

The proposed technology for manufacturing lining elements allows the use of powders of wear-resistant components and a metal bond of the composite alloy with a fraction of less than 0.5 mm, which saves the scarce metals (tungsten, nickel, titanium, etc.). .

It is possible to obtain parts of any geometric shape and wear-resistant composite layer of less than 5 mm.

The method makes it possible to use as a wear-resistant component of the composite material both wettable metal-bonded and non-wettable materials. Everything

This allows the manufacture of multifunctional and special purpose lining elements with high performance characteristics.

Claims (1)

Invention Formula A method of manufacturing a lining element in which the steel shell is filled with a wear-resistant component and an alloy-bond and is joined to them by heating to an alloy-bond temperature, characterized in that, in order to improve performance while simultaneously increasing wear resistance, the elements are made by two-stage pressure treatment in a hot state, while heating in the first stage is carried out to a temperature of 300-350 ° C with a speed of 10-30 degrees / min, the deformation is carried out with a force of (2-4) -10 Pa, whereupon the part is heated at a speed of 30-100 degrees / min after the alloy-binder melts and is deformed with a force (1-5). Table 1 Wolfram carbide. (Relit-3) obtained by calcination in an inert atmosphere Titanium carbide boride obtained by the SHS method  Titanium carbide borosilicide Melkhior of the MNMts brand 20-20, TU TsMO 1105-56 Note: The final heating temperature was 1400K. The high content of the wear-resistant component is due to the large atomic weight of tungsten with the same volume ratio 67-33 36-64 60 The titanium carbide borosilicide is obtained by the SHS method. table 2