Novel compound additive for producing high-strength carbon-graphite material and preparation method of carbon-graphite material

A composite additive, carbon-graphite technology, applied in the field of carbon-graphite materials, can solve problems such as affecting the mechanical properties of graphite products, and achieve the effects of promoting the graphitization process, inhibiting gas expansion, and inhibiting expansion.

Inactive Publication Date: 2017-08-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, iron is an element harmful to graphite products, too much addition will affect the mechanical properties of graphite products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Adopt 1% ​​of sulfur content, 1t of coal-based needle coke with nitrogen content of 0.5%, 0.25t of modified coal tar pitch, 4kg of diboron trioxide powder, and 1kg of lanthanum oxide for batching, wherein the coal-based needle coke particle size ratio ( Mass percentage) is: 12.5% ​​for 1-2mm, 22.5% for 0.5-1mm, 30% for 0.15-0.5mm, 25% for 0.076-0.15mm, 10% for 3 Above, the flexural strength is as high as 15MPa.

Embodiment 2

[0026] Adopt 1% ​​of sulfur content, 1t of coal-based needle coke with nitrogen content of 0.5%, 0.25t of modified coal tar pitch, 4kg of boron trioxide powder, and 2kg of cerium oxide for batching, wherein the coal-based needle coke particle size ratio ( Mass percentage) is: 12.5% ​​for 1-2mm, 22.5% for 0.5-1mm, 30% for 0.15-0.5mm, 25% for 0.076-0.15mm, 10% for 3 Above, the flexural strength is as high as 15MPa.

Embodiment 3

[0028] Adopt 1% ​​of sulfur content, 1t of coal-based needle coke with nitrogen content of 0.5%, 0.25t of modified coal tar pitch, 3kg of diboron trioxide powder, and 2kg of praseodymium oxide for batching, wherein the coal-based needle coke particle size ratio ( Mass percentage) is: 12.5% ​​for 1-2mm, 22.5% for 0.5-1mm, 30% for 0.15-0.5mm, 25% for 0.076-0.15mm, 10% for <0.076mm; the softening point of modified coal tar pitch is 115°C ; The particle size of praseodymium oxide and boron trioxide is less than 76 μm. The above raw materials are kneaded, shaped, roasted, impregnated twice - roasted, graphitized and other processes by the usual graphite preparation process to make carbon graphite material. Among them, the resistivity of carbon and graphite materials is lower than 6.1μΩ·m, the bulk density is above 1.78g / cm3, and the flexural strength is as high as 15MPa.

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Abstract

The invention discloses a novel compound additive for producing a high-strength carbon-graphite material and a preparation method of the carbon-graphite material. The novel compound additive is a mixture of rare-earth metal powder or a rare-earth compound and a boron compound, wherein the two substances are mixed at a mass ratio ranging from (1 to 1) to (1 to 5); the rare-earth compound is selected from one or more of a rare-earth organic compound and a rare-earth inorganic compound; the boron compound is selected from one or more of a boron organic compound and a boron inorganic compound.

Description

technical field [0001] The invention relates to the technical field of carbon-graphite materials, in particular to a novel composite additive for producing high-strength carbon-graphite materials and a preparation method for the high-strength carbon-graphite materials. Background technique [0002] One of the key factors affecting the performance of graphite products during the graphitization process is gas expansion. When the baked product is in the graphitization furnace, when the temperature rises above 1400 ° C, elements such as hydrogen, sulfur, and nitrogen will be converted into H 2 、H 2 S, N 2 , NH 3 Among them, the nitrogen element is mainly released at 1400-1900°C, and the sulfur element is concentrated in the range of 1700-2100°C. At this time, the pore wall of the coke in a plastic state is under the pressure of the exhaust gas, and the volume expands and decreases. The physical and chemical properties of graphite products. By adding a gas expansion inhibitor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52
CPCC04B35/521C04B2235/3224C04B2235/3227C04B2235/3409C04B2235/40C04B2235/42C04B2235/48C04B2235/5427C04B2235/5436C04B2235/77C04B2235/96
Inventor 路贵民王榕艳于建国
Owner EAST CHINA UNIV OF SCI & TECH
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