CN113896534A - Isostatic pressing graphite product with high compression strength and high breaking strength and forming method thereof - Google Patents
Isostatic pressing graphite product with high compression strength and high breaking strength and forming method thereof Download PDFInfo
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- CN113896534A CN113896534A CN202111154087.4A CN202111154087A CN113896534A CN 113896534 A CN113896534 A CN 113896534A CN 202111154087 A CN202111154087 A CN 202111154087A CN 113896534 A CN113896534 A CN 113896534A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 239000010439 graphite Substances 0.000 title claims abstract description 46
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 46
- 238000000462 isostatic pressing Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000006835 compression Effects 0.000 title claims description 6
- 238000007906 compression Methods 0.000 title claims description 6
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 238000007580 dry-mixing Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 12
- 239000010426 asphalt Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 239000006229 carbon black Substances 0.000 claims description 7
- 239000002006 petroleum coke Substances 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 5
- 238000005056 compaction Methods 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000003068 static effect Effects 0.000 abstract description 9
- 238000000465 moulding Methods 0.000 abstract description 7
- 239000004615 ingredient Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000007598 dipping method Methods 0.000 abstract description 3
- 238000005087 graphitization Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 43
- 239000007770 graphite material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/528—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/003—Pressing by means acting upon the material via flexible mould wall parts, e.g. by means of inflatable cores, isostatic presses
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/522—Graphite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
- C04B2235/424—Carbon black
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/608—Green bodies or pre-forms with well-defined density
Abstract
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.
Description
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.
Claims (4)
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。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111154087.4A CN113896534A (en) | 2021-09-29 | 2021-09-29 | Isostatic pressing graphite product with high compression strength and high breaking strength and forming method thereof |
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| CN202111154087.4A CN113896534A (en) | 2021-09-29 | 2021-09-29 | Isostatic pressing graphite product with high compression strength and high breaking strength and forming method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115626826A (en) * | 2022-11-11 | 2023-01-20 | 湖南大学 | Low-density wear-resistant carbon graphite material with independent micropores and preparation method thereof |
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Application publication date: 20220107 |