DE1646658B2 - Process for the production of carbon moldings of different, from the porous to the dense state reaching microstructure from modified pitch - Google Patents

Description

9 10

had easily graphitizable properties, as one of the corresponding objects of the preceding

by X-rays, and had examples similar and had the following properties

have the following properties:

Shore hardness (Hs) 50 Shore hardness (Hs) 115 to 128

Porosity 16% ⁵ porosity 13%

Flexural strength 290 kg / cm ² shrinkage 9%

Specific resistance 6 · ΙΟ " ⁴ Ohm · cm. Specific bulk density ... 1.50

Carbonization yield 88%

Example 7 ₁₀ Flexural strength 850kg / cir ² .

Coal tar pitch with a softening point of. .

85 ⁰ C was ground to a fine powder and in this example 9

^{Form heated to 250 0} C in a chlorine gas atmosphere. 500 g coal tar pitch with a softening

The resulting material had a water point of 85 ° C and was kept at 400 ° C for 90 minutes

material / carbon atomic ratio of 0.38, and up to 15 dry distilled, the pitch being blown off with air

a temperature of 360 ^° C. was no softening. A modified pitch was obtained with a

point to be determined. Softening point from 23S to 245 ° C and with a

This material was then converted into a fine hydrogen / carbon atomic ratio of 0.46.

Powder was ground, which was then ground at a pressure of This pitch was ground and at a pressure of

400 kg / cm ² pressed into the same article, 20,400 kg / cm ^{2 was} molded into an article. Dei

as in example 4. The object was in air at a temperature

This object was heated to 300 ° C. with a temperature increase of 0.3 ° C./min

increase of 2 to 3 ° C / min in nitrogen gas to 300 ⁰ C followed by a further heating to 28OO ° C with a

heated and then heat-treated by using a temperature rise of 5 ^: C / min. A disc-shaped egg

a temperature rise of 5 ° C / min to a higher object with a diameter of 40 mm and

Temperature was brought. a thickness of 10 mm had a Shore hardness

The resulting article had the same 95%, a porosity of 12%, and a flexural strength

external appearance like the corresponding counterpart of 600 kg / cm ² .

The lattice spacing was 3.39 A.

the following properties: 30 moods the X-ray 002 diffraction line

Shore hardness (Hs) 75 to 85 Tf ^ u * ' ^ ^? Ψ ^ α ^W _t ^idersta ? ^{d 1} ^

Porosity 20 ° / ' ^cm ' End product was a carbon

_{Shrinkage lg} o / material material with difficult graphitization.

Specific bulk density ... 1.35 Example 10

Carbonization yield .... 70% ³⁵ . ,,. ., """, -, _A ..

Bieeefestiekeit 400 ke / cm ² Petroleum asphalt was blown at 390 ° C

EgeresugKeit ^{U Kg / m} 'dry-distilled from air. The resulting material

. . rial was ground and left in a chlorine gas atmosphere

^For example 8 heat-treated _{at a} temperature of up to 25O ^{0 C.}

The chloroform-insoluble constituent of a 40 The modified pitch obtained in this way

Coal tar pitch was used as the starting material. proposed a hydrogen / carbon atomic ratio

This material was powdered well ausgebrei- 0.42, and up to a temperature of 36O ⁰ C was keir

tet so that it came into contact with air and determined by the softening point.

Heat oxidized at 220 ⁰ C. A This pitch was obtained at a pressure of 300 kg / cnr

Pitch with a hydrogen / carbon atomic ratio 45 pressed into an article of pronounced shape, the

nis of 0.50 and with a softening point of in air with a temperature rise of 1 ° C / min aul

245 to 250 ° C. 300 ° C and then in nitrogen to 2800 ° C

This pitch was ground into a fine powder which was heated. The coal obtained in this way

at a pressure of 450 kg / cm ² to a disk with fabric material had a Shore hardness of 68, a Poro

a diameter of 20 mm and a thickness of 50 sity of 48%, a flexural strength of 78 kg / cm ² unc

7 mm was pressed. The disk was found to have a resistivity of 13 x 10 ^-3 ohm-cm

heat-treated under the same conditions as in the Further, it was found by X-rays that dai

Example 5 is given. The resulting counter material has difficult to graphitize properties

stood had an outward appearance similar to that of one.

Claims (4)

Claim: Process for the production of carbon moldings of different, from the porous to the dense state reaching microstructure from modified pitch, which is obtained from tars or pitches, the 1) in order to achieve easy graphitization in an inert gas atmosphere of a heat treatment, 2) in order to achieve a difficult graphitability in one or more oxidizing Gases such as oxygen, ozone, halogens or sulfur, a heat treatment, 3) for the purpose of making it easy to graphitize a solvent extraction or 4) following one or more of the above-mentioned process steps 1) to 3) subjected to a dry distillation in order to achieve a corresponding graphitability will, wherein the bodies formed from the modified pitch are carbonized or graphitized after carbonization, characterized in that a modified pitch with a hydrogen / carbon atomic ratio of 0.2 to 0.6 and with a softening point of at least 170 ⁰ C to powdery fine particles crushed, the pulverized pitch is pressed under a pressure ranging from ICO to 3000 kg / cm ² into a desired shape and then heated, the shaped body produced in this manner in an oxygen containing atmosphere to a temperature between 200 ° C and 33O ⁰ C , based on a temperature rise of 0.1 to 3 ° C / min. 40