Preparation method of high-performance ultra-fine structure carbon graphite product

A graphite product and high-performance technology, applied in the field of carbon graphite, can solve problems such as cost increase, raw material shortage, cracking, etc., and achieve the effect of increasing density and strength, reducing anisotropy, and good overall performance

Pending Publication Date: 2020-01-10
青岛瀚博电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the domestically produced carbon graphite products use petroleum coke and pitch coke as raw materials. Due to energy shortages, environmental pollution and other issues, petroleum coke, pitch coke and other energy materials are in short supply. The increase in cost and the shortage of raw materials have seriously restricted the development of the industry.
Second, petroleum coke and other coke products, due to their special structure, cause problems such as cracking and damage due to the exclusion of volatile components in the process of carbonization and graphitization, which seriously affects the performance of fine-structure graphite
Third, petroleum coke and other coke products are still prone to complex shapes during the pulverization process, and it is difficult to process them into spherical powder materials, resulting in the anisotropy of fine-structure carbon graphite products, which further affects the fine-structure carbon graphite products. performance
Fourth, at present, carbon graphite products mostly use kneading to mix masterbatch, adhesive and other additives. Due to the large particle size of primary particles, the isotropy of fine structure carbon graphite products is poor, which eventually leads to fine structure Differences in performance of carbon graphite products
Among them, kneading is a kind of dry mixing, and the adhesive has a certain viscosity. The way of kneading can easily lead to uneven distribution of material components, and the shrinkage of various components due to uneven mixing under temperature changes The difference in ratio and shrinkage speed leads to internal cracking of ultra-fine structure carbon graphite products during the production process, which eventually leads to the scrapping of ultra-fine structure carbon graphite products, which greatly increases the production cost of ultra-fine structure carbon graphite products

Method used

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  • Preparation method of high-performance ultra-fine structure carbon graphite product

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preparation example Construction

[0020] The embodiment of the present invention discloses a method for preparing a high-performance ultra-fine structure carbon graphite product, which includes the following steps: composite graphite powder and a first binder in a granulated manner, and carbonize to obtain a composite granular material; The composite granular material is mixed with the second binder, additives, and graphitization accelerator in liquid phase, then dried, shaped, impregnated and roasted repeatedly for 3-8 times, and graphitized to obtain high-performance ultra-fine structure carbon graphite products.

[0021] As a preferred solution, the particle size of the graphite micropowder used in the present invention is ≤3 microns. This raw material solves a series of problems caused by energy materials such as shortage of raw materials, rising costs, and environmental pollution. At the same time, after composite carbonization, the material forms isotropic aggregates to reduce the anisotropy of subsequent...

Embodiment 1

[0039] 1. Granulation:

[0040] Add 40kg of asphalt with a softening point of 90°C to 400kg of alcohol, stir evenly and add 200kg of graphite powder with a particle size below 3 microns;

[0041] Granulating and drying by means of spray drying;

[0042] After drying, it is carbonized at 500°C, and the granulation is finalized. The particle size is about 30 μm, and the maximum particle size is less than 70 μm.

[0043] figure 1 It is the SEM figure of the raw material graphite powder that the present embodiment adopts. It can be seen from the figure that the single particle size of graphite micropowder is less than or equal to 3 μm, and the graphite particles are mostly flakes, so it is difficult to make fine-structured graphite by direct use, and the isotropy is very poor.

[0044] figure 2 This is the SEM image of graphite after secondary granulation in this example, the secondary particle size after granulation is about 30 μm, and the maximum particle size is less than ...

Embodiment 2

[0068] 1. Granulation:

[0069] Add 40kg of asphalt with a softening point of 90°C to 400kg of alcohol, add 40kg of asphalt, stir well and add 200kg of graphite powder below 2μm;

[0070] It is dried by freeze-drying, and then granulated by kneading and granulation. After granulation, it is carbonized at 800 ° C to shape the granules. The particle size is about 30 μm, and the maximum particle size is less than 70 μm.

[0071] 2. Made of extremely fine structure carbon graphite products:

[0072] Weigh 400kg of alcohol, add 2kg of PVA and stir for 30 minutes, add 40kg of asphalt with a softening point of 280°C, and 10kg of iron oxide for stirring;

[0073] After uniform dispersion, add 200kg of granulated main material and mix evenly;

[0074] to dry the liquid;

[0075] Isostatic pressing using an isostatic press;

[0076] Use low temperature asphalt (softening point less than 70) for impregnation;

[0077] Carry out roasting at 900 degrees Celsius, the roasting time is: ...

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Abstract

The invention provides a preparation method of a high-performance ultra-fine structure carbon graphite product, which comprises the following steps: compounding and carbonizing graphite micropowder and a first adhesive in a granulation manner to obtain a composite particle material; subjecting the composite particle material, a second adhesive, additive and graphitization accelerator to liquid phase mixing, then drying and molding, performing 3-8 times repeated dipping and roasting, graphitization treatment to obtain high-performance ultra-fine structure carbon graphite products. Compared withthe prior art, the invention uses graphite micropowder as a raw material, thus saving energy and protecting the environment; isotropic composite particle materials are obtained after granulation, which greatly reduces the anisotropy of subsequent ultra-fine structure carbon graphite products; third, problems such as internal cracking caused by elastic deformation caused by temperature change areavoided, the density and strength of ultra-fine structure carbon graphite products are improved, and the comprehensive performance is good.

Description

technical field [0001] The invention relates to the technical field of carbon graphite, in particular to a preparation method of a high-performance ultrafine structure carbon graphite product. Background technique [0002] Carbon graphite products are a kind of high-temperature and anti-oxidation products made of coke such as petroleum coke and pitch coke as raw materials, coal tar pitch as binder, and processed by crushing, batching, kneading, molding, sintering, impregnating, graphitization, machining and other processes. Conductive materials are widely used in different fields such as metallurgy, chemical industry, aerospace, electronics, machinery, building materials, nuclear energy, etc., such as bearings and sealing rings for wear resistance; electrodes for EDM, electrodes for electrolytic machining; crystallization for continuous casting Devices; heaters, crucibles, furnace linings for semiconductor production; sintering molds and aerospace vehicle gas rudders and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/532C04B35/626C04B35/622
CPCC04B35/522C04B35/532C04B35/622C04B35/6267C04B2235/3272C04B2235/5436C04B2235/616C04B2235/656C04B2235/6567C04B2235/77C04B2235/96
Inventor 王金枝刘成全魏洪文谷亦杰
Owner 青岛瀚博电子科技有限公司
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