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Method for preparing special graphite blank for silicified graphite by vacuum gas phase deposition reaction

A technology of silicided graphite and deposition reaction, which is used in the preparation/purification of carbon, chemical instruments and methods, carbon compounds, etc. problems, to achieve the effect of good compatibility, good generalizability, and small internal stress

Active Publication Date: 2018-07-24
四川海承碳素制品有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing a special graphite blank for silicified graphite by a vacuum vapor deposition reaction method, so as to solve the problem of poor thermal stability, poor mechanical strength, anisotropy and internal stress of the existing graphite blank. Poor, leading to problems such as easy breakage and damage, high temperature cracking, and difficult control of open porosity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Dry mix 45 parts of carbon black N339 and 2 parts of earthy graphite in a kneader for 60 minutes, then add 53 parts of molten pitch and heat mix at about 180 ° C for 60 minutes to obtain a mixture, cool to room temperature, and ball mill the mixture powder and pass through a 320-mesh sieve to obtain a primary powder, then press the primary powder into shape, then place the formed powder in a downdraft kiln for 7 days at 1200°C, and finally grind it in a ball mill and pass through a 320 Mesh sieve to obtain a stage of carbon black.

[0029] 2) Take 83 parts of the first-stage carbon black obtained in step 1), 9 parts of pitch coke, 3 parts of earthy graphite and 5 parts of ammonium chloride and mix evenly to obtain a secondary powder, and use a ball mill to grind the secondary powder Grind the powder and pass through a 320-mesh sieve, then press it into a blank on an isostatic press with a pressing pressure of 20MPa, then place the formed blank in a downdraft kiln at ...

Embodiment 2

[0031] 1) Dry mix 44 parts of carbon black N339 and 1 part of earthy graphite in a kneader for 60 minutes, then add 55 parts of molten pitch and heat mix for 60 minutes at about 180 ° C to obtain a mixture, cool to room temperature, and ball mill the mixture powder and pass through a 320-mesh sieve to obtain a primary powder, then press the primary powder into shape, then place the formed powder in a downdraft kiln for 7 days at 1200°C, and finally grind it in a ball mill and pass through a 320 Mesh sieve to obtain a stage of carbon black.

[0032] 2) Take 85 parts of the first-stage carbon black obtained in step 1), 10 parts of pitch coke, 2 parts of earthy graphite and 6 parts of ammonium chloride and mix them evenly to obtain a secondary powder, and use a ball mill to grind the secondary powder Grind the powder and pass through a 320-mesh sieve, then press it into a blank on an isostatic press with a pressing pressure of 18MPa, then place the formed blank in a downdraft kil...

Embodiment 3

[0034] 1) Dry mix 44 parts of carbon black N339 and 2 parts of earthy graphite in a kneader for 60 minutes, then add 51 parts of molten pitch and heat mix at about 180°C for 60 minutes to obtain a mixture, cool to room temperature, and ball mill the mixture powder and pass through a 320-mesh sieve to obtain a primary powder, then press the primary powder into shape, then place the formed powder in a downdraft kiln for 7 days at 1200°C, and finally grind it in a ball mill and pass through a 320 Mesh sieve to obtain a stage of carbon black.

[0035] 2) Take 85 parts of the first-stage carbon black obtained in step 1), 9 parts of pitch coke, 2 parts of earthy graphite and 4 parts of ammonium chloride and mix them evenly to obtain a secondary powder, and use a ball mill to grind the secondary powder Grind the powder and pass through a 320 mesh sieve, then press it into a blank on an isostatic press, the pressing pressure is 22MPa, then place the formed blank in a downdraft kiln at...

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Abstract

The invention discloses a method for preparing a special graphite blank for silicified graphite by a vacuum gas phase deposition reaction. The method comprises the following steps: 1) thoroughly mixing carbon black N339 and earthy graphite, adding molten asphalt, hot-mixing at 170-185 degrees, and obtaining one-stage carbon black by ball milling, compression molding, roasting and ball milling; 2)mixing the one-stage carbon black, pitch coke, the earthy graphite and ammonium chloride, obtaining secondary powder materials, pressing the second materials into a blank, placing the shaped blank ina downdraft kiln, roasting at a temperature of 1000-1300 degrees for 6-8 days, and obtaining a semi-graphitized graphite blank. The graphite blank, prepared with the method, has good mechanical properties and stability, good thermal stability, good isotropic properties, small internal stress and the like, and has a wide application prospect.

Description

technical field [0001] The invention relates to silicified graphite, in particular to a method for preparing a special graphite blank for silicified graphite by a vacuum vapor deposition reaction method, and belongs to the technical field of inorganic non-metallic materials. Background technique [0002] Silicified graphite is also called silicon carbide coated graphite or silicon infiltrated graphite. It is a new type of silicon carbide / graphite composite material composed of silicon carbide, graphite, and free silicon, which is formed by infiltrating silicon or silicon carbide on the surface or deep layer of graphite as the matrix. The thickness of the silicon carbide layer is about 1-3mm, and it is closely combined with the carbon graphite matrix. At the same time, a certain amount of graphite is also distributed in the silicon carbide layer. Siliconized graphite combines the characteristics of carbon and silicon carbide. It not only has the self-lubricating properties o...

Claims

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Application Information

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IPC IPC(8): C01B32/205C01B32/05
Inventor 彭达鸿李新跃罗松罗宏曾宪光
Owner 四川海承碳素制品有限公司
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