Production technology of large-specification extraordinary isotropic graphite material

A graphite material and production process technology, which is applied in the production process field of large-scale special homogeneity graphite materials, can solve the problems of difference in volume shrinkage of filler and binder, poor structural uniformity, reduced mechanical strength, etc., to shorten production cycle, The structure is fine and dense, and the effect of improving mechanical properties

Inactive Publication Date: 2012-10-17
HUNAN CHANGYU NEW CARBON MATERIALS
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Problems solved by technology

However, in the above process, more than one-third of the binder decomposes and develops during the roasting process, resulting in a difference in volume shrinkage between the filler and the binder, which

Method used

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  • Production technology of large-specification extraordinary isotropic graphite material
  • Production technology of large-specification extraordinary isotropic graphite material

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Embodiment Construction

[0022] The present invention is described in detail with examples below.

[0023] In this example, the binder is modified asphalt, and its main performance indicators are: carbon residue rate: 53%, softening point: 79.5°C, volatile matter: 58.6%.

[0024] The impregnating agent is medium-temperature asphalt and high-temperature asphalt, and its main properties are as follows:

[0025] Medium temperature asphalt: carbon residue rate: 50.2%; softening point: 79.5°C; volatile matter: 58.6%;

[0026] High-temperature asphalt: carbon residue rate: 56.6%; softening point: 97.0°C; volatile matter: 54.1%.

[0027] The filler is calcined petroleum coke, and its main performance indicators are: ash content: 0.26%; moisture: 0.38%.

[0028] see figure 1 , the production process is carried out in the following steps:

[0029] 1. Jet crushing: after coarse crushing, the calcined petroleum coke or pitch coke is crushed with a jet mill to make coke powder with an average particle size of...

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Abstract

A production technology of a large-specification extraordinary isotropic graphite material comprises the following steps: preparing coke powder with the average particle size of 6-20mum through utilizing airflow crushing, carrying out kneading, rolling and extrusion molding on the coke powder, rapidly charring, carrying out secondary kneading and rolling after charring, pre-molding the material subjected to the secondary kneading and rolling, and carrying out sequent processes of isopressing molding, dipping, roasting, graphitization and the like on pre-molded green body to prepare isopressed graphite; and carrying out cold molding and pressure holding stripping, and roasting and dipping many times to prepare the extraordinary isotropic graphite material. The extraordinary isotropic graphite material prepared through the method of the invention has the advantages of high mechanical strength, low porosity and excellent surface processing characteristic.

Description

technical field [0001] The invention relates to a graphite processing technology, in particular to a production technology of a large-scale special isotropic graphite material. Background technique [0002] Graphite material has been widely used in many fields because of its high temperature resistance, corrosion resistance, self-lubrication and other characteristics. With the development of science and technology, the performance of graphite materials in various application fields has put forward higher requirements. Graphite materials are usually prepared by using calcined coke as aggregate carbon and modified pitch as binder, after mechanical mixing, molding, impregnation and graphitization heat treatment. However, in the above process, more than one-third of the binder decomposes and develops during the roasting process, resulting in a difference in volume shrinkage between the filler and the binder, which ultimately results in graphite materials with high porosity, poo...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/205
Inventor 彭轩
Owner HUNAN CHANGYU NEW CARBON MATERIALS
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