SU1765113A1 - Carbon-containing mass for production of formed-carbon products - Google Patents

Description

one

(21) 4725811/26

(22) 06/08/89

(46) 30.09 92. Bull. Number 36

(72) A.N. Seleznev, I.O. Polonsky, D.A.

Trapeznikov and S.A. Surkov

(56) Copyright Certificate CCCf No. 391105, cl. From 04 To 35/54, 1971

(54) CARBON SUPPORTING MASS FOR PRODUCING CARBON PRODUCTS

(57) The invention relates to a technology for producing carbon materials. The goal is to improve the physical and mechanical properties and improve the homogeneity of the structure of finished products. The essence of the method lies in the fact that as a carbon-containing mass for the manufacture of carbon products use the mass of the following composition, wt.%: Calcined cupcake fraction 0.8-0.3 mm 11.2-18, calcined cupcake fraction 0.2 mm 59.0 -65; natural graphite fraction 0,8-0,3 mm 0,8-2, coal tar pitch - the rest. The density of the carbon material is 1730-1760 kg / m3, the ultimate compressive strength, bending and stretching 49.2-52.8 MPa, 24.5-26.3 MPa 14.6-15.3 MPa, respectively, the number of defects 2-3 per 1 cm2. 1 tab.

The invention relates to the field of carbon materials.

The aim of the invention is to improve the physico-mechanical properties and improve the homogeneity of the structure of finished products,

The carbon material is prepared as follows.

According to GOST 22898-78, petroleum coke of the KNPS grade is calcined at 1250 ° C and crushed in a ball mill and then dispersed to obtain a fraction of -1.2 + 0.3 mm, after which a fraction of the fraction over 0.8 mm. Further, it is mixed with the same way obtained natural graphite of the same fraction in the ratio of 1: 12-12, then mixed with the fine fraction of the same coke, 0.2 mm, in such quantity that the content of the large fraction was in the range of 15-25 wt.% of the entire mixture, and then mixed with coal tar pitch brand

And according to GOST 10200-83 so that its content in the mass ranged from 21 to 23 wt.% Then the mass is pressed by forcing through the mouthpiece at a pressure of 15-20 MPa. The workpieces thus obtained, with a diameter of 200 mm and a length of 500 mm, are burned to 1250 ° C for 323 hours, and then impregnated with the same pitch, pre-heated to 350 ° C to 1 MPa for 0.5 h, then pour them with pitch temperature of 200 ° C and maintaining at this temperature under a pressure of 0.6 MPa for 3 hours. After that, they are again burned in the same mode and graphitized to 2500 ° C in 40 hours. The dependence of the properties of the carbon material on the amount of components in the carbon-containing mass is shown in examples

Example 1. The content of calcined coke fraction - 0.8 + 0.3 mm is 11.2 mA% of the calcined coke fraction - 0.2 mm - 65 mA% natural content

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graphite fraction - 0.8 + 0.3 mm - 0.8 wt.% the content of the pitch with 23 wt.%. Pressing is carried out under a pressure of 15 MPa. The finished graphite has a density of 1760 kg / m3, compressive strength of 49.2 MPa, flexural strength of 24.5 MPa, tensile strength of 14.6 MPa, specific electrical resistance of 12.9 Ohm-m, homogeneity of the material structure There are 2 defects with a characteristic size of more than 1 mm per 1 cm of the surface of the workpiece.

The remaining examples are made in accordance with example 1, but with different content of the components in the mass.

Example (prototype). The mixture to produce graphite is formed by mixing artificial graphite fraction - 0.5 mm in an amount of 35% by weight of calcined coke of the same fraction in an amount of 25% by weight, nee-calcined coke fraction of 0.1 mm in an amount of 25% by weight and in charge at 25 wt.% of coal tar pitch is added to the blending. It is further pressed, calcined, impregnated, re-calcined and graphitized in accordance with the present invention. The resulting carbon material has a density of 1680 kg / m (extrusion is not in the matrix, but pierced), the compressive strength is 41 MPa, the tensile strength is 11.9 MPa, the strength is strong. The content of calcined coke fraction is 0.8 + 0.3 wt. .%

The content of calcined coke fraction - 0.2 mm, wt.%

The content of natural graphite fraction - 0.8 + 0.3 mm, wt.%

The content of stone coal pitch in mass, wt.%

Density of finished graphite, kg / m3

Compressive strength, MPa

Flexural strength, MPa

Strength at stretching, MPa

Specific resistance, m

Defect structure homogeneity per 1 cm2

Bending at 20 MPa, the resistivity of 14.8 10 Ω and the homogeneity of the structure are characterized by 3.9 defects per cm.

The results of the experiments are summarized in the table.

As follows from the analysis of the tabular data, the proposed method makes it possible to increase the level of properties of the material obtained by 13.8% compared to the prototype and to 22.1% increase the homogeneity of its structure.

Claims (1)

Invention Formula Carbonaceous mass to produce carbon products containing calcined coke, graphite and coal tar pitch, characterized in that, in order to improve the physicomechanical properties and improve the uniformity of the structure of finished products, it contains natural graphite fraction - 0.8 - 0.3 mm and calcined coke fractions of 0.8-0.3 mm 0.2 mm in the following ratio, wt.%: Calcined Coke fractions 0.8-0.3 mm -11.2-18.0; Calcined Coke fractions of 0.2 mm- 59.0-65.0; Natural graphite fractions 0,8-0,3 mm - 0,8-2,0; Coal tar is the rest. 2 18 5 j 15 61.5 eleven 62 21 52,8