阅读说明：本技术 一种抗压、抗折强度高的等静压石墨制品及其成型方法 (Isostatic pressing graphite product with high compression strength and high breaking strength and forming method thereof ) 是由 狄志宇 姚鑫 武晨洁 于 2021-09-29 设计创作，主要内容包括：本发明涉及一种抗压、抗折强度高的等静压石墨制品的成型方法,具体包括以下步骤：获取满足指标条件的各组分-干混-湿混-等静压成型后制得体积密度大、机械强度高的石墨制品。本发明通过对等静压制品的成型配料进行调整后,制备的等静压制品的体积密度大幅度提高；且在下一步焙烧过程中,由于该等静压制品的收缩很大,可在一次焙烧后直接进入石墨化工序,免去了多次浸渍和多次焙烧,大大解决了成本的同时也降低了生产周期,达到了使用高端石墨的要求,延长了在各行业的使用寿命；本发明制成的等静压制品在经过焙烧后,形成的石墨制品的强度也大幅提升,重要的是其制品的抗压、抗折强度大幅提升。(The invention relates to a method for molding an isostatic pressing graphite product with high compressive strength and high flexural strength, which specifically comprises the following steps: obtaining each component which meets the index condition, dry mixing, wet mixing, isostatic pressing and preparing the graphite product with large volume density and high mechanical strength. After the forming ingredients of the equal static pressed product are adjusted, the volume density of the prepared equal static pressed product is greatly improved; in the next roasting process, because the static pressing products shrink greatly, the graphitization process can be directly carried out after one-time roasting, multiple times of dipping and multiple times of roasting are omitted, the production period is reduced while the cost is greatly reduced, the requirement of using high-end graphite is met, and the service life of each industry is prolonged; after the isostatic pressing product prepared by the method is roasted, the strength of the formed graphite product is greatly improved, and importantly, the compressive strength and the flexural strength of the product are greatly improved.)

1. A forming method of an isostatic pressing graphite product with high compression strength and high rupture strength is characterized by comprising the following steps:

(1) obtaining components meeting index conditions, wherein the components comprise asphalt coke powder with the particle size of 10 mu m, carbon black powder with the particle size of 15 mu m and petroleum coke powder with the particle size of 15 mu m;

(2) dry mixing, namely uniformly mixing the components obtained in the step (1) in parts by weight to prepare a dry mixture;

60 portions of asphalt coke powder

5 portions of carbon black

5 parts of petroleum coke

Wherein the dry mixing temperature is 200-240 ℃, and the dry mixing time is 100-130 min;

(3) wet mixing, namely uniformly mixing the dry mixture prepared in the step (2) with a binder according to the following weight part to prepare a wet mixture, and naturally cooling to room temperature for later use;

70 parts of dry blend

30 portions of adhesive

Wherein the wet mixing temperature is 170 ℃, and the wet mixing time is 70-90 min;

(4) isostatic compaction, namely grinding the wet mixed material prepared in the step (3) into powder with the particle size of 40 mu m, then putting the powder into a sealed package, vacuumizing, carrying out isostatic compaction, and preparing the powder with the volume density of 1.52-1.53g/cm under the pressure of 150-200MPa³The graphite article of (1).

2. The method for forming an isostatic pressed graphite product with high compressive and flexural strength as claimed in claim 1, wherein: the binder is modified asphalt.

3. The method for forming an isostatic pressed graphite product with high compressive and flexural strength as claimed in claim 1, wherein: and (4) vacuumizing for 2 h.

4. An isostatic graphite product with high compressive and flexural strength, which is prepared by the method of any one of claims 1 to 4, and the volume density of the prepared isostatic graphite product is 1.52 to 1.53g/cm³。

Technical Field

The invention belongs to the field of molding of graphite products, particularly relates to an isostatic pressing graphite product and a molding method thereof, and particularly relates to an isostatic pressing graphite product with high compressive strength and high flexural strength and a molding method thereof.

Background

At present, after the isostatic pressing graphite product is molded, the strength of the graphite product obtained by a roasting process often cannot meet the requirement, the volume density is lower than that of the traditional graphite material, and meanwhile, the internal structure of the graphite product is not compact enough, so that the isostatic pressing graphite product can reach various indexes only by being soaked and roasted for multiple times, the cost of the graphite product is increased, and the production period is prolonged.

Disclosure of Invention

In view of the above, the present invention aims to provide an isostatic pressing graphite product with high compressive strength and high flexural strength and a molding method thereof, and aims to overcome the defects of low strength, small volume density and insufficiently compact internal structure of the graphite product in the prior art.

In order to achieve the purpose of the invention, the technical scheme is as follows:

a method for molding an isostatic pressing graphite product with high compression strength and high rupture strength comprises the following steps:

(1) obtaining components meeting index conditions, wherein the components comprise asphalt coke powder with the particle size of 10 mu m, carbon black powder with the particle size of 15 mu m and petroleum coke powder with the particle size of 15 mu m;

(2) dry mixing, namely uniformly mixing the components obtained in the step (1) in parts by weight to prepare a dry mixture;

60 portions of asphalt coke powder

5 portions of carbon black

5 parts of petroleum coke

Wherein the dry mixing temperature is 200-240 ℃, and the dry mixing time is 100-130 min;

(3) wet mixing, namely uniformly mixing the dry mixture prepared in the step (2) with a binder according to the following weight part to prepare a wet mixture, and naturally cooling to room temperature for later use;

70 parts of dry blend

30 portions of adhesive

Wherein the wet mixing temperature is 170 ℃, and the wet mixing time is 70-90 min;

(4) isostatic pressing, namely grinding the wet mixture prepared in the step (3) into granulesAfter the powder with the diameter of 40 mu m is put into a sealed package, vacuumized and subjected to isostatic compaction to prepare the powder with the bulk density of 1.52-1.53g/cm under the pressure of 150-200Mpa³The graphite article of (1).

Further, the binder in the invention is modified asphalt.

Further, the time for vacuumizing in the step (4) is 2 hours.

In addition, the invention also provides an isostatic pressing graphite product with high compression resistance and high breaking strength, which is prepared by the method, and the volume density of the prepared isostatic pressing graphite product is 1.52-1.53g/cm³。

The invention has the beneficial effects that:

after the forming ingredients of the equal static pressed product are adjusted, the volume density of the prepared equal static pressed product is greatly improved; in the next roasting process, because the static pressing products shrink greatly, the graphitization process can be directly carried out after one-time roasting, multiple times of dipping and multiple times of roasting are omitted, the production period is reduced while the cost is greatly reduced, the requirement of using high-end graphite is met, and the service life of each industry is prolonged; after the isostatic pressing product prepared by the method is roasted, the strength of the formed graphite product is greatly improved, and importantly, the compressive strength and the flexural strength of the product are greatly improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the application and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.

FIG. 1 is a flow chart of the preparation method of the present invention.

Detailed Description

Based on the background technology, after the isostatic pressing graphite product is molded, the strength of the graphite product obtained by the roasting process often cannot meet the requirement, the volume density is lower than that of the traditional graphite material, and meanwhile, the internal structure of the graphite product is not compact enough.

The isostatic pressing graphite product is a high-end product of graphite products at home and abroad, the performance index of the isostatic pressing graphite product is dozens of times or even hundreds of times higher than that of the product for conveying fine-particle graphite products, the selected raw materials and auxiliary materials are very important, the ingredients are more and more critical, and the formula determines the performance index of the isostatic pressing graphite product in all directions.

The inventor of the application finds that after the molding ingredients of the isostatic pressing product are adjusted, the volume density of the graphite product after isostatic pressing is greatly improved, and the strength of the baked graphite product is also greatly improved.

The above prior art solutions have drawbacks that are the results of practical and careful study, and therefore, the discovery process of the above problems and the solutions proposed by the following embodiments of the present application to the above problems should be the contributions of the applicant to the present application in the course of the present application.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.

Some embodiments of the present application are described in detail below.

As shown in fig. 1, a method for forming an isostatic pressing graphite product with high compressive and flexural strength comprises the following steps:

(1) obtaining each component meeting index conditions

The components comprise asphalt coke powder with the grain diameter of 10 mu m, carbon black powder with the grain diameter of 15 mu m and petroleum coke powder with the grain diameter of 15 mu m.

The function of the carbon black powder is to enhance the strength of the graphite product; the petroleum coke powder has the function of increasing the shrinkage of the graphite product.

(2) Dry blending

Uniformly mixing the components obtained in the step (1) in parts by weight to prepare a dry mixture;

60 portions of asphalt coke powder

5 portions of carbon black

5 parts of petroleum coke

Wherein the dry mixing temperature is 200-240 ℃, and the dry mixing time is 100-130 min;

(3) wet mixing

Uniformly mixing the dry mixture prepared in the step (2) with an adhesive according to the following weight part to prepare a wet mixture, and naturally cooling to room temperature for later use;

70 parts of dry blend

30 portions of adhesive

Wherein the wet mixing temperature is 170 ℃, and the wet mixing time is 70-90 min; the binder is modified asphalt;

(4) isostatic compaction

Grinding the wet mixed material prepared in the step (3) into powder with the particle size of 40 mu m, then placing the powder into a sealed package, vacuumizing for 2h, carrying out isostatic compaction, and preparing the powder with the volume density of 1.52-1.53g/cm under the pressure of 150-200Mpa³The graphite article of (1).

After the forming ingredients of the equal static pressed product are adjusted, the volume density of the prepared equal static pressed product is greatly improved; in the next roasting process, because the static pressing products shrink greatly, the graphitization process can be directly carried out after one-time roasting, multiple times of dipping and multiple times of roasting are omitted, the production period is reduced while the cost is greatly reduced, the requirement of using high-end graphite is met, and the service life of each industry is prolonged; after the isostatic pressing product prepared by the method is roasted, the strength of the formed graphite product is greatly improved, and importantly, the compressive strength and the flexural strength of the product are greatly improved.

In addition, the invention also provides an isostatic pressing graphite product with high compression strength and high breaking strength, which adopts the technical schemeThe volume density of the prepared isostatic pressing graphite product is 1.52-1.53g/cm³。

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement, component separation or combination and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.