CN116332650A - Short-process near-net-shape manufacturing method of graphite product - Google Patents
Short-process near-net-shape manufacturing method of graphite product Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 60
- 239000010439 graphite Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 38
- 239000002994 raw material Substances 0.000 claims abstract description 46
- 238000005056 compaction Methods 0.000 claims abstract description 10
- 238000003754 machining Methods 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 63
- 239000000047 product Substances 0.000 claims description 43
- 238000011049 filling Methods 0.000 claims description 22
- 239000013067 intermediate product Substances 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 238000000462 isostatic pressing Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 8
- 239000000571 coke Substances 0.000 claims description 8
- 238000005087 graphitization Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 7
- 229920001568 phenolic resin Polymers 0.000 claims description 7
- 239000005011 phenolic resin Substances 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 239000003575 carbonaceous material Substances 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 239000011593 sulfur Substances 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 5
- 238000004898 kneading Methods 0.000 claims description 5
- 239000002006 petroleum coke Substances 0.000 claims description 5
- 230000003064 anti-oxidating effect Effects 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000004886 process control Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 claims description 2
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 238000007730 finishing process Methods 0.000 claims description 2
- 238000010304 firing Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 239000006253 pitch coke Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 235000019580 granularity Nutrition 0.000 description 22
- 238000000465 moulding Methods 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000002036 drum drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003405 preventing effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
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- 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
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Abstract
The invention discloses a short-process near-net-shape manufacturing method of a graphite product, which comprises the following process steps: raw material selection, raw material preparation, isostatic compaction, roasting, finish machining and finished product production. The method of the invention has short production period in the aspect of manufacturing the graphite product, so that the produced graphite product can rapidly respond to the demands of various end user forms and various performances, and has various product forms and reliable quality.
Description
Technical Field
The invention belongs to the technical field of preparation of graphite products, and particularly relates to a short-process near-net-shape manufacturing method of a graphite product.
Background
Graphite has many excellent performances, and graphite products have good adsorptivity, thermal conductivity, chemical stability, corrosion resistance, oxidation and reduction preventing effects, and are widely applied to industrial departments of metallurgy, machinery, electricity, chemical industry, textile, national defense and the like. The traditional processing and manufacturing process flow of the graphite product comprises the following steps: raw material selection, stirring and kneading, molding, primary roasting, primary soaking, secondary roasting, secondary soaking, tertiary roasting, graphitization/purification, machining and finished product, wherein the process flow is usually a period of 30 days to 45 days. For example, patent document CN112194488B (hereinafter referred to as document 1) discloses an isostatic pressing graphite preparation process for processing craft articles, the process flow of which is a traditional process, and the innovation is that vibration and vacuumizing treatment are carried out before static pressure molding in a molding process, air between powder of the mixture is removed, the density of molded graphite products is improved, and the technical problem that the graphite products cannot be applied to the processing of craft articles due to density factors is solved. Patent document CN108529612B (hereinafter referred to as document 2) discloses an isostatic pressing graphite product and a production method thereof, wherein the technological process is a traditional process, and the innovation is that the optimization of manufacturing technological parameters comprises mixing, roasting, machining and the like, and the end product is a cylindrical or cuboid graphite blank. Patent document CN114014656B (hereinafter referred to as document 3) discloses a production system for manufacturing graphite products by utilizing recycled graphite materials, which innovates and reasonably recycles a large amount of graphite particles and graphite powder generated in the processing process of graphite blanks, and manufactures new graphite products for heat exchangers and chemical fields. Throughout the graphite product processing industry, long-flow discontinuous operations (e.g., documents 1-3 above) are still being observed, and the products of carbon production plants are mainly cylindrical and rectangular graphitized billets. Graphitized blanks are sold to downstream customers and then processed by a machining process to form graphite articles of various forms and specifications. However, with the expansion of application of graphite products in various industrial fields, end users are urgent to need end products with various forms and various performances to meet the requirements of quick change of the graphite products, the traditional long processing flow is slow in demand information transmission, and the supply and demand conversion links are many, so that the requirements of various industries on the diversity, the high efficiency and the reliability of the graphite products cannot be met.
Disclosure of Invention
In view of the problems existing in the prior art, one aspect of the present invention provides a short-process near-net-shape manufacturing method for graphite products, which comprises the following process steps: raw material selection, raw material preparation, isostatic compaction, roasting, finish machining and finished product production; wherein:
in the raw material selection process step, the raw material is graphitized carbon material, specifically, the carbon content is more than or equal to 99%, the molecular structure of the carbon material is a layered hexagonal lattice structure, the heat-resistant temperature is more than 3500 ℃, the graphitization degree is more than or equal to 85%, the ash content is less than or equal to 0.5%, the volatile component is less than or equal to 0.5%, the moisture content is less than or equal to 0.2%, and the sulfur content is less than or equal to 0.2%; if the graphitization degree is low and the ash content is large, the performance of the graphite product prepared by the method, such as heat conduction, resistivity and the like, is poor, and the use requirement cannot be met; the quality problems such as cracks and the like easily occur in the production process of the graphite product using the method of the invention due to the excessive moisture, volatile matters and sulfur;
the raw material preparation process comprises the following steps: batching, mixing and drying to finally obtain pug for the isostatic compaction process step;
in the isostatic pressing process step, the pug is directly filled into a rubber mold with a preset shape, and is pressed and formed by using an isostatic press, and the process requirements are as follows: the pressure range is 40-150MPa, the dwell time is 5-30min, the pressure increasing and pressure releasing rate is less than 10MPa/min, and finally an intermediate product is obtained;
in the roasting process step, the intermediate product is put into a shuttle kiln or a tunnel kiln and N is introduced 2 Or carbon is buried to realize oxidation-resistant roasting, wherein in the roasting, the roasting temperature is as follows: the roasting time is 900-1200 ℃, and the roasting time is: 30-240h, the temperature rising rate is as follows: 4-40 ℃/h, the highest temperature heat preservation time is as follows: 2-5h; wherein N is introduced into 2 The process control for realizing the antioxidation roasting is as follows: adopts a nitrogen storage tank to supply gas, N 2 The purity NZ of the catalyst is more than or equal to 99 percent, the moisture is less than or equal to 0.5 percent, and the air supply pressure is more than or equal to 0.3Mpa; the process control for realizing the anti-oxidation roasting by adopting the carbon burying protection is as follows: and placing the intermediate product into a crucible, and using metallurgical coke particles or other carbon particles as a filler, wherein the dosage of the filler can be determined according to the graphite product.
In some embodiments, wherein the graphitized carbon material is selected from graphitized petroleum coke, pitch coke, metallurgical coke, spent isostatic graphite articles, or carbon-carbon composite articles.
In some embodiments, in the batching step, the raw materials are crushed to prepare a 1# material with the granularity of 4 meshes, a 2# material with the granularity of 18 meshes, a 3# material with the granularity of 80 meshes, a 4# material with the granularity of 200 meshes and a 5# material with the granularity of 325 meshes respectively, and the raw materials with different granularities are uniformly mixed according to different proportions according to different types of products to obtain a first intermediate raw material; wherein the mixing proportion is 1# material: 2# material: 3# material: 4# material: 5# material=5 to 10:10 to 20:10 to 20:40 to 60.
In some embodiments, in the mixing procedure, the first intermediate raw material and phenolic resin serving as a binder are simultaneously mixed in a kneader, wherein the mixing time is 10-30min, the mixing temperature is 30-60 ℃, and the phenolic resin accounts for 5-15% of the total amount of the mixed materials, so as to obtain the second intermediate raw material.
In some embodiments, in the drying process, the second intermediate feedstock is dried at a temperature of 60-100 ℃ for 5-15 minutes (e.g., using a drum drying apparatus or a drying bed) to obtain a pug for the isostatic compaction process step having a volatile content of 4% or less.
In some embodiments, in the firing process step, a filler is used having a particle size of 6-2mm in a ratio of 80%: the filling material with the weight less than or equal to 2mm accounts for 20 percent.
In some embodiments, the filling method of the filling material is as follows: firstly, paving a layer of filling material with the thickness of 10-30mm on the bottom of a crucible, putting intermediate products to be roasted into the crucible, densely filling the filling material with the thickness of 10-30mm between the intermediate products to be roasted, and finally paving the filling material with the particle size of less than or equal to 2mm on the upper part of the intermediate products to be roasted by 50-100mm.
In some embodiments, in the finishing process step, the user-desired external dimensions are machined using a numerically controlled machine tool.
In some embodiments, the finished product comprises a graphite crucible, a graphite electrode, a graphite sagger, a graphite block, a graphite plate. And the internal quality of the finished product is inspected by adopting an X-ray flaw detection mode, and no cracks are required on the surface and the inside of the product.
In another aspect, the present invention provides a graphite article produced by the above-described production method.
Based on the technical scheme, the invention provides a short-process near-net-shape manufacturing method of a graphite product through an original processing technology, which utilizes specific raw materials to pass through key control parameters in each process of the invention, and can realize the following process flows provided by the invention: raw material selection, raw material preparation, isostatic compaction, roasting, finish machining and obtaining a product with proper quality compared with the traditional flow: raw material selection, stirring and kneading, molding, primary roasting, primary soaking, secondary roasting, secondary soaking, tertiary roasting, graphitization/purification, machining and finished product, and the simplification of the process flow, namely the short-flow manufacturing process, is realized. The method provided by the invention is a novel manufacturing process flow of the artificial graphite product with the characteristic of short flow, can enrich the processing industry chain of the graphite product, realizes the efficient and energy-saving short-flow near-net-shape manufacturing of the multi-variety, multi-specification and multi-performance graphite product, shortens the production period, reduces the production cost, can solve the contradiction between market supply and demand and improves the social benefit compared with the above documents 1-3.
Drawings
FIG. 1 is a graphite crucible article made using the method of the present invention.
FIG. 2 is a photograph of a kneading apparatus employed in the method of the present invention.
FIG. 3 is a photograph of an isostatic pressing apparatus employed in the present invention.
FIG. 4 is a photograph of a calcination apparatus used in the present invention.
Detailed Description
The following describes the invention in detail by way of specific examples, which are intended to aid in understanding the invention and are not intended to limit the invention.
Example 1: short-process near-net-shape manufacturing method of graphite product
The production practice of graphite crucibles is implemented by Qingdao new materials limited company in the method of the invention, and the method specifically comprises the following steps:
1) The raw materials are graphitized petroleum coke and metallurgical coke with the carbon content of 99.56%, the graphitization degree of 88%, the ash content of 0.12%, the volatile matter of 0.22% and the sulfur content of 0.10%.
2) Pulverizing raw materials to obtain a 1# material with a granularity of 4 meshes, a 2# material with a granularity of 18 meshes, a 3# material with a granularity of 80 meshes, a 4# material with a granularity of 200 and a 5# material with a granularity of 325 meshes, and mixing raw materials with different granularities according to the 1# material: 2# material: 3# material: 4# material: the ratio of 5# material=10:15:15:15:45 was uniformly mixed to obtain a first intermediate material.
3) Phenolic resin binder was used in an amount of 8.5% of the total amount of the mix. And simultaneously placing the prepared first intermediate raw material and the binding agent into a kneader to mix, wherein the mixing time is 20min, and the mixing temperature is 60 ℃ to obtain the second intermediate raw material.
4) And drying the uniformly mixed second intermediate raw material for 10min at the temperature of 100 ℃ by adopting roller drying equipment to obtain mud for isostatic compaction, wherein the volatile content is 3.5%.
5) And (3) directly filling the uniformly mixed pug obtained in the step (4) into a rubber mold of a graphite crucible, and pressing and forming by using an isostatic pressing machine, wherein the pressure is 60MPa, the pressure maintaining time is 5min, and the pressure increasing and pressure releasing rates are kept to be 8MPa/min.
6) Filling the intermediate product subjected to isostatic pressing into a crucible and filling with metallurgical coke, wherein the mixture ratio of the filling materials is as follows: the filling material with the granularity of 6-2mm accounts for 80 percent: the filling material with the weight less than or equal to 2mm accounts for 20 percent. Then placing the mixture into a shuttle kiln, wherein the highest roasting temperature is 1100 ℃, the heating time is 36h, the mixture is kept at 1100 ℃ for 2h, and naturally cooling to room temperature.
7) The intermediate product after roasting and forming is processed into the external dimension required by the user by using a numerical control machine tool, and the product is subjected to X-ray flaw detection. The quality of the inner part and the outer part of the product is good after inspection.
The graphite crucible produced in this example has a bulk density of 1.70g/cm, as measured by performance 3 The apparent porosity was 13.32%, the electrical resistivity was 16.68. Mu. Ω. M, the flexural strength was 14.75MPa, and the compressive strength was 22.75MPa. The performance of the graphite crucible can meet the actual use needs of customers, and can replace the existing long-process technologyAnd (5) producing the product.
Example 2: short-process near-net-shape manufacturing method of graphite product
The Qingdao new material Co., ltd. Has implemented the practice of producing graphite blocks by the method of the invention, and specifically comprises the following steps:
1) The raw materials are graphitized petroleum coke and metallurgical coke with the carbon content of 99.43 percent, the graphitization degree of 89 percent, the ash content of 0.13 percent, the volatile component of 0.20 percent and the sulfur content of 0.11 percent.
2) Pulverizing raw materials to obtain a 1# material with a granularity of 4 meshes, a 2# material with a granularity of 18 meshes, a 3# material with a granularity of 80 meshes, a 4# material with a granularity of 200 and a 5# material with a granularity of 325 meshes, and mixing raw materials with different granularities according to the 1# material: 2# material: 3# material: 4# material: the ratio of 5# material=10:15:15:15:45 was uniformly mixed to obtain a first intermediate material.
3) Phenolic resin binder was used in an amount of 10.0% of the total amount of the mix. And simultaneously placing the prepared first intermediate raw material and the binding agent into a kneader to mix, wherein the mixing time is 30min, and the mixing temperature is 60 ℃ to obtain the second intermediate raw material.
4) And drying the uniformly mixed second intermediate raw material for 10min at the temperature of 100 ℃ by adopting roller drying equipment to obtain mud for isostatic compaction, wherein the volatile content is 3.8%.
5) And (3) directly filling the uniformly mixed pug obtained in the step (4) into a rubber mold of a graphite crucible, and pressing and forming by using an isostatic pressing machine, wherein the pressure is 120MPa, the pressure maintaining time is 30min, and the pressure increasing and pressure releasing rates are kept to be 5MPa/min.
6) Placing the intermediate product subjected to isostatic pressing into a tunnel kiln, and adopting a nitrogen storage tank to supply air, N 2 Purity nz=99.9%, moisture 0.3%, air feed pressure 0.52MPa; the highest temperature of the tunnel kiln is 1100 ℃, the heating time is 60h, the heat is preserved for 4h at 1100 ℃, and the tunnel kiln is naturally cooled to the room temperature.
7) The intermediate product after roasting and forming is processed into the external dimension required by the user by using a numerical control machine tool, and the product is subjected to X-ray flaw detection. The quality of the inner part and the outer part of the product is good after inspection.
The graphite block produced in this example had a bulk density of 1 as measured by performance.72g/cm 3 The apparent porosity is 10.32%, the flexural strength is 22.75MPa, and the compressive strength is 35.75MPa. The graphite block can meet the actual use needs of customers and can replace products produced by the existing long-flow technology.
Comparative example 1:
the Qingdao new material limited also adopts the following method to manufacture graphite blocks, and specifically comprises the following steps:
1) The raw materials are graphitized petroleum coke and metallurgical coke with the carbon content of 99.35%, the graphitization degree of 81%, the ash content of 0.23%, the volatile matter of 0.25% and the sulfur content of 0.15%.
2) Pulverizing raw materials into powder, respectively preparing a No. 1 material with granularity of 200 meshes and a No. 2 material with granularity of 325 meshes, and mixing raw materials with different granularities according to the No. 1 material: the ratio of 2# material=45:55 was uniformly mixed to obtain a first intermediate material.
3) Phenolic resin binder was used in an amount of 9.5% of the total mix. And simultaneously placing the prepared first intermediate raw material and the binding agent into a kneader to mix, wherein the mixing time is 20min, and the mixing temperature is 30 ℃ to obtain the second intermediate raw material.
4) And drying the uniformly mixed second intermediate raw material for 10min at the temperature of 100 ℃ by adopting roller drying equipment to obtain mud for isostatic compaction, wherein the volatile content is 4.4%.
5) And (3) directly filling the uniformly mixed pug obtained in the step (4) into a rubber mold of a graphite crucible, and pressing and forming by using an isostatic pressing machine, wherein the pressure is 90MPa, the pressure maintaining time is 2min, and the pressure increasing and pressure releasing rates are kept to be 10MPa/min.
6) Placing the intermediate product subjected to isostatic pressing into a tunnel kiln, and adopting a nitrogen storage tank to supply air, N 2 The purity nz=99.9%, the moisture content is 0.3%, and the air supply pressure is 0.52MPa. The highest temperature of the tunnel kiln is 1100 ℃, the heating time is 20h, the heat is preserved for 1h at 1100 ℃, and the tunnel kiln is naturally cooled to the room temperature.
7) The intermediate product after roasting and forming is cracked, has low strength and can not meet the use requirement. The specific performance data are as follows: the bulk density of the graphite block is 1.52g/cm 3 The apparent porosity is 22.32%, the flexural strength is 5.75MPa, and the compressive strength is 12.75MPa。
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or that equivalents may be substituted for part of the technical features thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A short-process near-net-shape manufacturing method of a graphite product, comprising the following process steps: raw material selection, raw material preparation, isostatic compaction, roasting, finish machining and finished product production; wherein:
in the raw material selection process step, the raw material is graphitized carbon material, specifically, the carbon content is more than or equal to 99%, the molecular structure of the carbon material is a layered hexagonal lattice structure, the heat-resistant temperature is more than 3500 ℃, the graphitization degree is more than or equal to 85%, the ash content is less than or equal to 0.5%, the volatile component is less than or equal to 0.5%, the moisture content is less than or equal to 0.2%, and the sulfur content is less than or equal to 0.2%;
the raw material preparation process comprises the following steps: batching, mixing and drying to finally obtain pug for the isostatic compaction process step;
in the isostatic pressing process step, the pug is directly filled into a rubber mold with a preset shape, and is pressed and formed by using an isostatic press, and the process requirements are as follows: the pressure range is 40-150MPa, the dwell time is 5-30min, the pressure increasing and pressure releasing rate is less than 10MPa/min, and finally an intermediate product is obtained;
in the roasting process step, the intermediate product is put into a shuttle kiln or a tunnel kiln and N is introduced 2 Or carbon is buried to realize oxidation-resistant roasting, wherein in the roasting, the roasting temperature is as follows: the roasting time is 900-1200 ℃, and the roasting time is: 30-240h, the temperature rising rate is as follows: 4-40 ℃/h, the highest temperature heat preservation time is as follows: 2-5h; wherein N is introduced into 2 The process control for realizing the antioxidation roasting is as follows: adopts a nitrogen storage tank to supply gas, N 2 Purity NZ of (2)More than or equal to 99%, less than or equal to 0.5% of water, and more than or equal to 0.3Mpa of air supply pressure; the process control for realizing the anti-oxidation roasting by adopting the carbon burying protection is as follows: the intermediate product is placed in a crucible, and metallurgical coke particles or other carbon particles are used as filling materials.
2. The method of manufacture of claim 1, wherein the graphitized carbon material is selected from graphitized petroleum coke, pitch coke, metallurgical coke, spent isostatic graphite articles, or carbon-carbon composite articles.
3. The production method according to claim 1 or 2, wherein in the proportioning step, the raw materials are crushed to prepare a 1# material having a particle size of 4 mesh, a 2# material having a particle size of 18 mesh, a 3# material having a particle size of 80 mesh, a 4# material having a particle size of 200 mesh and a 5# material having a particle size of 325 mesh, respectively, and the raw materials having different particle sizes are uniformly mixed according to different proportions according to different types of products to obtain a first intermediate raw material; wherein the mixing proportion is 1# material: 2# material: 3# material: 4# material: 5# material=5 to 10:10 to 20:10 to 20:40 to 60.
4. The production method according to claim 3, wherein in the mixing step, the first intermediate raw material and a phenolic resin as a binder are mixed in a kneader at the same time, wherein the kneading time is 10 to 30 minutes, the kneading temperature is 30 to 60 ℃, and the phenolic resin is used in an amount of 5 to 15% of the total amount of the mixture, to obtain a second intermediate raw material.
5. The manufacturing method according to claim 4, wherein in the drying process, the second intermediate raw material is dried at a temperature of 60-100 ℃ for 5-15min to obtain a pug for the isostatic pressing process step, the volatile content of which is 4% or less.
6. The production method according to any one of claims 1 to 5, wherein in the firing process step, a filler having a particle size of 6 to 2mm is used in a filler ratio of 80%: the filling material with the weight less than or equal to 2mm accounts for 20 percent.
7. The manufacturing method according to claim 6, wherein the filling method of the filler is: firstly, paving a layer of filling material with the thickness of 10-30mm on the bottom of a crucible, putting intermediate products to be roasted into the crucible, densely filling the filling material with the thickness of 10-30mm between the intermediate products to be roasted, and finally paving the filling material with the particle size of less than or equal to 2mm on the upper part of the intermediate products to be roasted by 50-100mm.
8. The manufacturing method according to any one of claims 1 to 7, wherein in the finishing process step, a user-requested external dimension is machined using a numerical control machine tool.
9. The manufacturing method according to any one of claims 1 to 8, wherein the finished product comprises a graphite crucible, a graphite electrode, a graphite sagger, a graphite block, a graphite plate.
10. A graphite article manufactured by the manufacturing method according to any one of claims 1 to 9.
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