RU2705837C1 - Composition of additive articles production - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to powder metallurgy. It can be used for production of articles by additive technologies from cobalt-chrome powder materials under conditions of mass, serial and single production. Powder of cobalt-chrome alloy for production of additive articles has average particle size of 35.69 mcm, obtained by electro-erosion dispersion of cobalt-chrome alloy of grade KHMS in butyl alcohol at voltage on electrodes of 100-120 V, pulse repetition frequency of 100–120 Hz and capacity of discharge capacitors of 45 mcF.

EFFECT: higher physical and chemical properties.

1 cl, 3 dwg, 6 tbl, 3 ex

Description

The present invention relates to the field of powder metallurgy and can be used for the manufacture of products by additive technologies from cobalt-chrome powder materials in the conditions of mass, serial and single production.

A known method of producing a composite powder based on a titanium-niobium system, comprising placing titanium powder in an amount of 60 wt. % and niobium powder in an amount of 40 wt. % to the planetary mill. Steel grinding balls are also added to the chamber. A small amount of sodium chloride is added to the chamber to prevent powder from sticking together. Then, to ensure the so-called mechanical welding, the planetary mill rotates at a speed of 250 rpm. The process continues for 40 hours with stops every 15 minutes to cool the chamber. The result is a composite powder of the composition TiNb (40 wt.%). [2].

The main disadvantage of this method is the very long duration of obtaining a composite powder based on the TiNb system (40 wt.%) With a uniform distribution of structural components throughout the particle volume due to low-energy mechanical activation, as well as the undesirable presence of sodium chloride in the composite.

The closest technical solution is a method of preparing a charge for tungsten carbide-based carbides. The invention relates to the production of cermet carbides based on carbides of refractory metals, which are used as wear-resistant materials, cutting tools, erosion-resistant, heat-resistant coatings. A mixture of tungsten, carbon and cobalt powders, taken in proportions corresponding to the composition of VK-6 alloy, is subjected to mechanical treatment in a mechanochemical reactor at an acceleration of 40 ... 60 g for 10-30 minutes) [3].

The objective of the invention is to obtain a high-quality composition of the mixture to improve the physico-mechanical properties of products obtained by additive technologies from cobalt-chrome powder materials.

The problem is solved in that the cobalt-chrome alloy powder for the manufacture of additive products having an average particle size of 35.69 microns was obtained by electroerosive dispersion of the KHMS cobalt-chrome alloy in butyl alcohol at an electrode voltage of 100-120 V, pulse repetition rate of 100-120 Hz and capacitances of discharge capacitors 45 microfarads.

The technological plant for producing powders from conductive alloys consists of a spark source power supply, a reactor, and a control system. In the reactor between the electrodes are granules - pieces of an alloy of arbitrary shape and size. The electrodes are made of dispersible material. The interelectrode gap is filled with butyl alcohol so that the granule layer is immersed in this liquid.

In contact, the granules form many electrical contacts connected in series in parallel between the electrode gap. One discharge pulse between the electrodes causes sparking in many places in the layer of granules immersed in the working fluid. At the points of contact, the material of the granules can be not only melted, but also brought to higher temperatures, at which evaporation and explosive removal of the material is possible. In this case, the particles of the substance come off the surface of the granules and are instantly cooled by a liquid. As a result of electrical erosion, particles of a predominantly spherical shape arise.

Example 1

=100…120 Гц, емкость разрядных конденсаторов C=45 мкФ.On the installation (Pat. 2449859 Russian Federation, IPC С22F 9/14, С23Н 1/02, B82Y 40/00. Installation for producing nanodispersed powders from conductive materials [Text] / Ageev E.V. et al.; Applicant and patent holder of the Southwestern state university - No. 2010104316/02; application 08.02.2010; publ. 05/10/2012, Bull. No. 13) dispersed the KHMS alloy in butyl alcohol under the following conditions: voltage at electrodes U = 100 ... 120 V, pulse repetition rate

= 100 ... 120 Hz, the capacitance of discharge capacitors C = 45 μF.

Additive products were obtained at a temperature of 1100 ° C. The chemical composition of the product is presented in table. one.

Table 1

The elemental composition of the resulting product

Element Mass fraction,% ABOUT 2.44 Si 0.94 Mo 4.30 Cr 26.51 Fe 0.42 Co 62.13 Ni 3.26 Total: 100.00

A snapshot of the microstructure and elemental composition of the obtained product using a Quanta 600 FEG scanning electron microscope are shown in FIG. 1 and FIG. The results of the study of the porosity of the sample by the metallographic method are shown in table 2 and figure 3.

table 2

Porosity (metallographic method)

Sample, ºС Analysis area, sq. Km Porosity,% D _min D _max D _med 1100 75310.1 0.78 0.1 5.2 0.3

The results of the study of microhardness are presented in table. 3. It was found that the average microhardness is 10927 MPa.

Table 3

Vickers microhardness

Vickers hardness Sample, ºС 1100 one 963 2 963 3 1003 4 1091 5 1394 6 1175 7 1017 8 1045 nine 1307 10 1193 Average value (units) 1115 MPa 10927 GPa 10,927

For the production of additive products from cobalt-chrome powder, these installation parameters should be used, since under these conditions, high physical and mechanical properties of the product are achieved.

Example 2

=100…120 Гц, емкость разрядных конденсаторов C=45 мкФ.On the installation (Pat. 2449859 Russian Federation, IPC С22F 9/14, С23Н 1/02, B82Y 40/00. Installation for producing nanodispersed powders from conductive materials [Text] / Ageev E.V. et al.; Applicant and patent holder of the Southwestern state university - No. 2010104316/02; application 08.02.2010; publ. 05/10/2012, Bull. No. 13) dispersed the KHMS alloy in butyl alcohol under the following conditions: voltage at electrodes U = 100 ... 120 V, pulse repetition rate

= 100 ... 120 Hz, the capacitance of discharge capacitors C = 45 μF.

Additive products were obtained at a temperature of 1000 ° C. The chemical composition of the product is presented in table. 4.

Table 4

The elemental composition of the resulting product

Element Mass fraction,% ABOUT 2,32 Si 1.17 Mo 4.34 Cr 26.25 Fe 0.41 Co 62.24 Ni 3.27 Total: 100.00

A snapshot of the microstructure and elemental composition of the obtained product using a Quanta 600 FEG scanning electron microscope are presented in Figure 1. The results of the study of the porosity of the sample by the metallographic method are shown in Table 5.

Table 5

Porosity (metallographic method)

Sample, ºС Analysis area, sq. Km Porosity,% D _min D _max D _med 1060 77217.8 3.31 0.7 10.7 0.9

The results of the study of microhardness are presented in table. 6. It was found that the average microhardness is 8663 MPa.

Table 6

Vickers microhardness

Vickers hardness Sample, ºС 1000 one 950 2 976 3 1140 4 976 5 1017 6 824 7 878 8 655 nine 658 10 765 Average value (units) 884 MPa 8663 GPa 8,663

For the production of additive products from cobalt-chrome powder, these installation parameters should not be used, since under these conditions, the required physical and mechanical properties of the product are not achieved. The obtained physical and mechanical properties of the product are significantly lower than that of the first product.

Example 3

=100…120 Гц, емкость разрядных конденсаторов C=45 мкФ.On the installation (Pat. 2449859 Russian Federation, IPC С22F 9/14, С23Н 1/02, B82Y 40/00. Installation for producing nanodispersed powders from conductive materials [Text] / Ageev E.V. et al.; Applicant and patent holder of the South-West state university - No. 2010104316/02; application 08.02.2010; publ. 05/10/2012, Bull. No. 13) dispersed the KHMS alloy in butyl alcohol under the following conditions: voltage at electrodes U = 100 ... 120 V, pulse repetition rate

= 100 ... 120 Hz, the capacitance of discharge capacitors C = 45 μF.

Additive products were obtained at a temperature of 1140 ° C.

For the production of additive products from cobalt-chrome powder, these installation parameters should not be used, since under these conditions, the products undergo sintering poorly and are loose.

Information sources

1. Board, N.Yu. New technology for processing solid and heavy alloy waste // Instrument. - 1996. No. 6 - S. 47-49.

2. Zalikman, A.N. Obtaining hard alloys from regenerated WC-Co mixtures obtained from lumpy wastes by the zinc method // Non-ferrous metals. - 1993. No. 1 - S. 10.

3. Nemilov, E.F. Electroerosive processing of materials. L .: Engineering, Leningrad. Otdel, 1983. - 160 p.

Claims (1)

Cobaltochrome alloy powder for manufacturing additive products having an average particle size of 35.69 μm, characterized in that it is obtained by electroerosive dispersion of a cobalt chrome alloy of the KHMS grade in butyl alcohol at an electrode voltage of 100-120 V, pulse repetition rate of 100-120 Hz and capacitance of discharge capacitors 45 uF.

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