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High-hardness isostatic graphite and preparation method thereof

A technology of isostatic pressing and isostatic pressing, which is applied in the field of static-pressed graphite and its preparation, can solve the problems of insignificant improvement of the electrochemical properties of graphite materials and complicated operation, and achieve improved bulk density and flexural strength, uniform Good performance, improving fluidity and compressibility

Inactive Publication Date: 2013-02-06
天津市贝特瑞新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has defects such as complicated operation and insignificant improvement of the electrochemical performance of the prepared graphite material.

Method used

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  • High-hardness isostatic graphite and preparation method thereof
  • High-hardness isostatic graphite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Example 1 Preparation of isostatic graphite of the present invention

[0076] (1) Crushing and screening

[0077] Weigh petroleum coke and mesophase carbon microspheres, control their mass ratio to 5:5, place them in an airflow mill, and grind them through airflow to obtain a mixed powder with an average particle size of 3 μm. The mixed powder of the mixed powder is passed through a 1000 mesh sieve to obtain a fine raw material powder; after adding carbon black with a mass fraction of 4% in the fine raw material powder, it is put into a ball mill jar, and ball milled at a speed of 260r / min on a planetary ball mill 2h, make raw material mixture;

[0078] (2) Isostatic pressing

[0079] Preheat the raw material mixture obtained in step (1) to 80°C, put it into a rubber mold, and cold-press it under a pressure of 200Mpa for isostatic pressing. After holding the pressure for 18 minutes, it is demoulded to obtain isostatic pressing Formed body;

[0080] (3...

Embodiment 2

[0087] Example 2 Preparation of isostatic graphite of the present invention

[0088] (1) Crushing and screening

[0089] Weigh pitch coke and mesophase carbon microspheres, control the mass ratio of pitch coke:mesophase carbon microspheres to 4:6, place them in an airflow mill, and grind them through airflow to obtain an average particle size of 5 μm The mixed powder is passed through an 800-mesh sieve to obtain a raw material fine powder; after adding carbon black with a mass fraction of 6% in the raw material fine powder, it is put into a ball mill jar, and the planetary ball mill Ball milling at a speed of 260r / min for 2h to obtain a raw material mixture;

[0090] (2) Isostatic pressing

[0091] Preheat the raw material mixture prepared in step (1) to 80°C, put it into a rubber mold, and cold-press it under a pressure of 200Mpa for isostatic pressing, and release the mold after holding the pressure for 20 minutes to obtain an isostatic Pressed body;

[009...

Embodiment 3

[0099] Example 3 Preparation of isostatic graphite of the present invention

[0100] (1) Crushing and screening

[0101] Weigh pitch coke and mesophase carbon microspheres, control the mass ratio of pitch coke:mesophase carbon microspheres to 3:7, place them in an airflow mill, and grind them through airflow to obtain an average particle size of 6 μm The mixed powder is passed through an 800-mesh sieve to obtain a raw material fine powder; after adding carbon black with a mass fraction of 8% in the raw material fine powder, it is put into a ball mill jar, and the planetary ball mill Ball milling at a speed of 260r / min for 2h to obtain a raw material mixture;

[0102] (2) Isostatic pressing

[0103] Preheat the raw material mixture obtained in step (1) to 80°C, put it into a rubber mold, and cold press it under a pressure of 240Mpa for isostatic pressing. After holding the pressure for 18 minutes, the mold is released to obtain an isostatic pressing Formed body...

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Abstract

The invention relates to isostatic graphite and a preparation method of isostatic graphite. Isostatic graphite is prepared by uniformly mixing raw materials with 1-15wt% carbon black, and directly carrying out isostatic shaping, wherein the raw materials are obtained by mixing one or more of petroleum coke and pitch coke with 50-100wt% interphase carbon microspheres. According to the invention, autohesion of the interphase carbon microspheres is sufficiently utilized, an extra adhesive is not needed to be added, the defects of higher porosity, poor structure uniformity, lower mechanical strength and the like caused by volume shrinkage difference between the filler and the adhesive are overcome, the working procedures of pugging, repeatedly immersing and calcine and the like are omitted, and carbon black with adaptation mass fraction is added to the raw materials to reduce the friction between raw material fine powder is reduced, so that the porosity is reduced, the volume density and flexural strength are improved, and the fluidity and pressing property of the raw material fine powder are improved. The prepared graphite material has the advantages of compact structure, good uniformity, high mechanical strength and the like.

Description

technical field [0001] The invention belongs to the field of graphite materials, in particular to a high-hardness isostatic graphite containing mesophase carbon microspheres and a preparation method thereof. Background technique [0002] Graphite materials have the characteristics of high temperature resistance, corrosion resistance, self-lubrication, etc., and are widely used in many fields. Isostatic graphite is a new type of graphite material developed in the 1960s. It has good heat resistance. In an inert atmosphere, its mechanical strength increases with the increase of temperature. The mechanical strength at about 2500 ° C Reaching the highest value; compared with ordinary graphite, isostatic graphite has a fine and dense structure and good uniformity; the thermal expansion coefficient is very low and has excellent thermal shock resistance; excellent isotropy; strong chemical corrosion resistance; thermal conductivity and The conductivity is very good; it has the adva...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/52
Inventor 杨红强苗艳丽张俊平李花
Owner 天津市贝特瑞新能源科技有限公司
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