CN115557732A - Special crucible forming preparation process for cathode powder - Google Patents
Special crucible forming preparation process for cathode powder Download PDFInfo
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- CN115557732A CN115557732A CN202211534878.4A CN202211534878A CN115557732A CN 115557732 A CN115557732 A CN 115557732A CN 202211534878 A CN202211534878 A CN 202211534878A CN 115557732 A CN115557732 A CN 115557732A
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- 239000000843 powder Substances 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000011810 insulating material Substances 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 35
- 239000000203 mixture Substances 0.000 claims abstract description 32
- 238000005496 tempering Methods 0.000 claims abstract description 26
- 238000003825 pressing Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 238000005255 carburizing Methods 0.000 claims abstract description 18
- 239000010426 asphalt Substances 0.000 claims abstract description 16
- 238000005303 weighing Methods 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 238000010791 quenching Methods 0.000 claims description 25
- 230000000171 quenching effect Effects 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 claims description 17
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 10
- 238000004321 preservation Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
Classifications
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
- B29C67/242—Moulding mineral aggregates bonded with resin, e.g. resin concrete
- B29C67/243—Moulding mineral aggregates bonded with resin, e.g. resin concrete for making articles of definite length
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
A forming preparation process of a crucible special for negative electrode powder belongs to the field of crucibles special for negative electrode powder and comprises the following steps: A. selecting raw materials, weighing graphitized heat-insulating materials with different fineness according to the parts by mass, mixing 12-20 parts of large materials, 26-34 parts of middle materials, 16-24 parts of small materials and 30-38 parts of fine powder according to the parts by mass to obtain a primary mixture, weighing 20-28 parts of modified liquid asphalt, and mixing the modified liquid asphalt with the primary mixture to obtain a secondary mixture; B. tempering and carburizing the crucible mold; C. and pouring the mixture into a crucible mold for heating and pressing for forming to obtain the crucible special for the cathode powder. The invention improves the performance of the crucible by matching the graphitized heat-insulating materials with various finenesses, improves the performance of the crucible mold through heat treatment, further improves the performance of the crucible, and ensures that the surface of the crucible has high hardness, good homogeneity and prolonged service life.
Description
Technical Field
The invention belongs to the field of negative electrode powder special crucibles, and particularly relates to a forming preparation process of a negative electrode powder special crucible.
Background
The negative electrode powder is used for the battery, the material of the negative electrode powder is graphite, and the negative electrode powder needs to be heated to about 1000 ℃ when the battery is prepared, so that the performance requirement of the crucible special for the negative electrode powder is high.
The existing crucible special for the cathode powder mainly considers the wear resistance and the bending resistance, but the homogeneity of the crucible is poor, the surface layer of the crucible is easy to crack under the action of high temperature in the process of multiple use, the use frequency is short, only 3-5 times, and the crucible needs to be frequently replaced, so that the preparation cost of the battery is increased.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a process for preparing a special crucible for cathode powder by molding. According to the invention, the performance of the crucible is improved by matching the graphitized heat-insulating materials with various finenesses, and the performance of the crucible mold is improved by carrying out heat treatment on the crucible mold, so that the performance of the crucible is improved, and the prepared crucible special for the negative electrode powder has high surface hardness, excellent homogeneity and increased use times.
The invention adopts the specific technical scheme that:
a forming preparation process of a crucible special for negative electrode powder comprises the following steps:
A. selecting raw materials, weighing graphitized heat-insulating materials with different fineness, wherein the graphitized heat-insulating materials comprise 12-20 parts of large materials with the fineness of 3-6mm, 26-34 parts of medium materials with the fineness of 2-3mm, 16-24 parts of small materials with the fineness of 1-2 mm and 30-38 parts of fine powder with the fineness of 0.075-1mm in parts by weight, uniformly mixing the large materials, the medium materials, the small materials and the fine powder for one time to obtain a primary mixture, weighing 20-28 parts of modified liquid asphalt, and uniformly mixing the modified liquid asphalt and the primary mixture for the second time to obtain a secondary mixture;
B. carrying out heat treatment on the crucible mold, and carrying out quenching and tempering and carburizing on the crucible mold, wherein the quenching temperature of the quenching and tempering is 820-880 ℃, the quenching time is 3-4h, the tempering temperature is 540-680 ℃, and the tempering time is 2-3h; carburizing at 900-950 ℃ for 12-16h to obtain a crucible mold special for the cathode powder;
C. and C, pouring the secondary mixture obtained in the step A into the special crucible mold for the negative electrode powder obtained in the step B, heating and pressing to form at the forming temperature of 140-145 ℃ to obtain the special crucible for the negative electrode powder.
Furthermore, in the step A, the graphitized heat preservation material has the volatile content of less than 1.3%, the ash content of less than 1.2%, the sulfur content of less than 0.3%, and the resistivity of less than 160.
Further, the temperature of the first mixing in the step A is 160-170 ℃, and the temperature of the second mixing is 160-170 ℃.
And furthermore, the crucible mold in the step B is made of chromium molybdenum steel.
Further, the chromium-molybdenum steel is 42 chromium-molybdenum steel.
Further, the wall thickness of the crucible mold in the step B is more than or equal to 10cm.
Further, the pressing and forming in the step C adopt mechanical pressing equipment, and a pressing head of the mechanical pressing equipment adopts 42 chromium molybdenum steel
The invention has the beneficial effects that:
1. the crucible special for the cathode powder prepared by the crucible forming preparation process is increased in use times, the use times of the existing crucible are usually 3-5 times, and the use times of the crucible in the invention are more than 8 times, the surface hardness is higher, and the uniformity is more excellent. The invention relates to a crucible special for cathode powder, which is characterized in that the mass ratio of a graphitized heat preservation material adopted by the existing crucible special for cathode powder is large material, medium material, small material and fine powder, the graphitized heat preservation material with large particle size is taken as a main body, the graphitized heat preservation material with small particle size is taken as an auxiliary body, the gaps of the graphitized heat preservation material are filled step by step, so that the gaps in the crucible are reduced, and the wear resistance, hardness and other properties of the crucible are further improved.
2. According to the invention, the crucible mold is subjected to heat treatment, so that the performance of the crucible mold is improved, the performances such as hardness, homogeneity and wear resistance of the crucible mold are improved, and in the process of pressing and forming the crucible, the hardness of the crucible mold is improved, so that the deformation of the crucible mold in the pressing process is reduced, and the crucible mold is more attached to the outer surface of the crucible, so that the crucible is more compact, the contact area among powder particles is increased, and the strength of the crucible is improved; because the homogeneity of the crucible mold is improved, the hardness of each part of the crucible mold is basically consistent, so that the stress of each part is consistent in the compression molding process of the crucible, the condition that a certain area is raised or sunken is avoided, the surface is more uniform, the crucible is uniformly heated in the use process, and the crucible is not easy to generate micro-cracks; the wear resistance of the crucible mold is improved, the service life of the crucible mold is prolonged from 1 year to 3-5 years, and the production cost of the crucible is reduced.
3. In the invention, 42 chromium molybdenum steel is adopted as the material of the crucible grinding tool, the crucible mould in the existing crucible forming process usually adopts No. 45 steel, and as a certain temperature is required in the pressing forming process, and the No. 45 steel has overhigh heat dissipation and needs to be reheated to keep the working temperature, a jacket for heating heat-conducting oil is arranged at the crucible mould, but the performance of the product is influenced by the easy oil leakage of the jacket. The 42 chromium molybdenum steel is adopted as the material of the crucible grinding tool, the heat dissipation performance of the 42 chromium molybdenum steel is low, reheating is not needed in the pressing forming process, in addition, the strength and the toughness of the 42 chromium molybdenum steel are high, the wall thickness of the die is increased, the wall thickness of the die is more than or equal to 10cm, the die is not easy to damage in the long-term pressing process, and the service life of the die is prolonged.
4. The crucible special for the negative powder has low wall-hanging rate, the negative powder is heated at 800-1000 ℃ to enable the negative powder to have high viscosity, the wall-hanging rate of a traditional crucible is about 15% after the negative powder is heated, and after the crucible is used, the inner wall of the crucible needs to be scraped, so that the damage to the inner wall of the crucible is large.
5. The graphitized heat-insulating materials with different fineness are heated to 160-170 ℃ for mixing in a high-temperature mixing mode when being mixed for one time, the proportion of the conventional graphitized heat-insulating materials is large in fineness, so that the heat-insulating materials with small fineness and the heat-insulating materials with large fineness are adhered to each other and cannot well fill gaps if being mixed at high temperature, but the heat-insulating materials with small fineness are taken as main bodies, enough heat-insulating material fine powder wraps the graphitized heat-insulating materials with large granularity, the adhesion degree among the heat-insulating materials can be increased by heating, the heat-insulating materials with small fineness can be prevented from sinking, and the components of a crucible are layered, so that the performance of the crucible is influenced.
6. The quenching and tempering temperature and the carburizing temperature in the invention are different from the process parameters of the traditional heat treatment process, namely time and temperature, and because the crystal structure of graphite is different from that of metal, the specific process parameter range is adopted, and the crystal structure of graphite is beneficially changed based on the process parameter range, so that the performances of hardness, homogeneity, wear resistance and the like of a crucible mold are improved, and the performances and the service life of the crucible are further improved.
Detailed Description
1. Detailed description of the preferred embodiments
Example 1
A. Selecting raw materials, weighing 16 parts of a large graphitized heat-insulating material, 30 parts of a medium graphitized heat-insulating material, 20 parts of a small graphitized heat-insulating material and 34 parts of fine graphitized heat-insulating material in parts by mass, mixing the raw materials at 165 ℃ for the first time to obtain a primary mixture, weighing 25 parts of asphalt, and mixing the asphalt and the primary mixture at 160 ℃ for the second time to obtain a secondary mixture;
B. carrying out heat treatment on the crucible mold, and quenching and tempering and carburizing the crucible mold, wherein the quenching temperature of quenching and tempering is 860 ℃, the quenching time is 3.5 hours, the tempering temperature is 620 ℃, and the tempering time is 2.5 hours; the carburizing temperature is 920 ℃, the carburizing time is 14 hours, a special crucible mold for the cathode powder is obtained,
wherein the crucible mold is made of 42 chromium molybdenum steel, and the wall thickness of the crucible mold is 12cm;
C. and C, pouring the secondary mixture obtained in the step A into the special crucible mold for the negative electrode powder obtained in the step B, heating and pressing to form at the forming temperature of 142 ℃ to obtain the special crucible for the negative electrode powder.
Example 2
A. Selecting raw materials, weighing 20 parts of a large graphitized heat-insulating material, 34 parts of a medium graphitized heat-insulating material, 24 parts of a small graphitized heat-insulating material and 38 parts of fine graphitized heat-insulating material in parts by mass, mixing the raw materials at 160 ℃ for the first time to obtain a primary mixture, weighing 28 parts of asphalt, and mixing the asphalt and the primary mixture at 170 ℃ for the second time to obtain a secondary mixture;
B. carrying out heat treatment on the crucible mold, and quenching and tempering and carburizing the crucible mold, wherein the quenching temperature of the quenching and tempering is 820 ℃, the quenching time is 4 hours, the tempering temperature is 540 ℃, and the tempering time is 3 hours; the carburizing temperature is 900 ℃, the carburizing time is 16h, a special crucible mold for the cathode powder is obtained,
wherein the crucible mold is made of 42 chromium molybdenum steel, and the wall thickness of the crucible mold is 10cm;
C. and C, pouring the secondary mixture obtained in the step A into the special crucible die for the negative electrode powder obtained in the step B, heating and pressing to form at the forming temperature of 140 ℃ to obtain the special crucible for the negative electrode powder.
Example 3
A. Selecting raw materials, weighing 12 parts of a large graphitized heat-insulating material, 26 parts of a medium graphitized heat-insulating material, 16 parts of a small graphitized heat-insulating material and 30 parts of fine graphitized heat-insulating material powder according to parts by mass, mixing the raw materials at 170 ℃ for the first time to obtain a primary mixture, weighing 20 parts of asphalt, and mixing the asphalt and the primary mixture at 165 ℃ for the second time to obtain a secondary mixture;
B. carrying out heat treatment on the crucible mold, and carrying out quenching and tempering and carburizing on the crucible mold, wherein the quenching temperature of the quenching and tempering is 880 ℃, the quenching time is 3 hours, the tempering temperature is 680 ℃, and the tempering time is 2 hours; the carburizing temperature is 950 ℃, and the carburizing time is 12 hours, so that a special crucible mold for the negative electrode powder is obtained;
wherein the crucible mold is made of 42 chromium molybdenum steel, and the wall thickness of the crucible mold is 12cm;
C. and D, pouring the secondary mixture obtained in the step A into the special crucible mold for the negative electrode powder obtained in the step B, heating and pressing to form at the forming temperature of 145 ℃ to obtain the special crucible for the negative electrode powder.
Comparative example 1
Comparative example 1 is different from example 1 only in that the crucible mold for negative electrode powder in comparative example 1 is not heat-treated,
A. selecting raw materials, weighing 16 parts of a large graphitized heat-insulating material, 30 parts of a medium graphitized heat-insulating material, 20 parts of a small graphitized heat-insulating material and 34 parts of fine graphitized heat-insulating material in parts by mass, mixing the raw materials at 165 ℃ for the first time to obtain a primary mixture, weighing 25 parts of asphalt, and mixing the asphalt and the primary mixture at 160 ℃ for the second time to obtain a secondary mixture;
B. and D, pouring the secondary mixture obtained in the step A into a crucible mold, heating and pressing to form at the forming temperature of 142 ℃ to obtain the crucible special for the cathode powder.
Wherein the crucible mold is made of 42 chromium molybdenum steel, and the wall thickness of the crucible mold is 12cm;
comparative example 2
The comparative example 2 is different from the example 1 only in that the particle diameter of the graphitized insulating material in the crucible raw material for negative electrode powder in the comparative example 2 is different from that in the example 1,
A. selecting raw materials, weighing 38 parts of graphitized heat-insulating material, 30 parts of middle material, 18 parts of small material and 14 parts of graphitized heat-insulating material according to parts by mass, mixing the raw materials at 165 ℃ for the first time to obtain a primary mixture, weighing 25 parts of asphalt, and mixing the asphalt and the primary mixture at 160 ℃ for the second time to obtain a secondary mixture;
B. carrying out heat treatment on the crucible mold, and quenching and tempering and carburizing the crucible mold, wherein the quenching temperature of quenching and tempering is 860 ℃, the quenching time is 3.5 hours, the tempering temperature is 620 ℃, and the tempering time is 2.5 hours; the carburizing temperature is 920 ℃, the carburizing time is 14 hours, a special crucible mold for the cathode powder is obtained,
wherein the crucible mold is made of 42 chromium molybdenum steel, and the wall thickness of the crucible mold is 12cm;
C. and D, pouring the secondary mixture obtained in the step A into the crucible die special for the negative electrode powder obtained in the step B, heating and pressing to form at the forming temperature of 142 ℃ to obtain the crucible special for the negative electrode powder.
2. Performance test
Comparing the performances of the special crucibles for the negative electrode powder prepared in the above examples and comparative examples, wherein the hardness is measured by randomly taking 10 points on the surface of the crucible; the wall hanging prevention property is that the crucible is adopted to heat the negative electrode powder at 900 ℃, after the negative electrode powder is poured out, the percentage of the mass of the negative electrode powder stuck on the inner wall of the crucible to the mass of the heated negative electrode powder is calculated; the wear resistance is represented by the difference between the actual weight of the scraped negative electrode powder and the ideal weight of the negative electrode powder adhered to the inner wall; number of uses the crucibles prepared in the different examples and comparative examples were heated several times at the same temperature and the number of uses before cracks appeared was recorded and the results are shown in table 1.
TABLE 1
As can be seen from Table 1, the crucible special for the negative electrode powder has the advantages that the average surface hardness is not less than 55HCR, the difference between the maximum surface hardness and the minimum surface hardness is not more than 3HCR, the wear resistance is not more than 34g, the bending strength is not less than 113MPa, the wall built-up rate is not more than 6.8%, the use times are not less than 8 times, and the performances are excellent.
It can be seen from comparison between comparative example 1 and example 1 that the crucible formed by pressing the crucible mold subjected to heat treatment in example 1 has different improvements in hardness, homogeneity, service life and other properties, because the crucible mold is subjected to heat treatment, the properties of the crucible mold are improved, the hardness, homogeneity and other properties of the mold are improved, and because the hardness and homogeneity of the crucible mold are improved, the deformation of the crucible mold in the pressing process is reduced, the inner surface of the crucible mold is smoother, and the condition that a certain area protrudes or is recessed cannot occur in the pressing process, so that the outer surface of the crucible and the inner surface of the crucible mold are compacted more tightly and the outer surface is uniform, and the crucible mold is heated uniformly in the using process and is not easy to crack.
It can be seen from comparison between comparative example 2 and example 1 that, in example 1, the crucible formed by matching graphitized heat insulating materials with various finenesses is more excellent in performance, because in example 1, the large material, the medium material, the small material and the fine powder are matched with each other, and the fine powder and the medium material are used as main bodies to wrap the large material and the small material, so that the graphitized crucible on the surface layer of the crucible is more uniform in fineness, the crucible is excellent in homogeneity, the surface is more flat, the crucible is uniformly heated in use, and is not easily abraded when scraping materials after use, and meanwhile, the gaps inside the crucible are further reduced by the large amount of small-fineness graphitized heat insulating materials, so that the hardness of the crucible is improved.
Claims (7)
1. A forming preparation process of a crucible special for negative electrode powder is characterized by comprising the following steps:
A. selecting raw materials, weighing graphitized heat-insulating materials with different fineness, wherein the graphitized heat-insulating materials comprise 12-20 parts of large materials with the fineness of 3-6mm, 26-34 parts of medium materials with the fineness of 2-3mm, 16-24 parts of small materials with the fineness of 1-2 mm and 30-38 parts of fine powder with the fineness of 0.075-1mm in parts by weight, uniformly mixing the large materials, the medium materials, the small materials and the fine powder for one time to obtain a primary mixture, weighing 20-28 parts of modified liquid asphalt, and uniformly mixing the modified liquid asphalt and the primary mixture for the second time to obtain a secondary mixture;
B. carrying out heat treatment on the crucible mold, and quenching and tempering and carburizing the crucible mold, wherein the quenching temperature of quenching and tempering is 820-880 ℃, the quenching time is 3-4h, the tempering temperature is 540-680 ℃, and the tempering time is 2-3h; carburizing at 900-950 ℃ for 12-16h to obtain a crucible mold special for the cathode powder;
C. and C, pouring the secondary mixture obtained in the step A into the special crucible mold for the negative electrode powder obtained in the step B, heating and pressing to form at the forming temperature of 140-145 ℃ to obtain the special crucible for the negative electrode powder.
2. The forming preparation process of the crucible special for the negative electrode powder as claimed in claim 1, wherein the graphitized heat insulating material in the step A has a volatile content of less than 1.3%, an ash content of less than 1.2%, sulfur content of less than 0.3%, and a resistivity of less than 160.
3. The forming preparation process of the crucible special for the negative electrode powder as claimed in claim 1, wherein the temperature of the primary mixing in the step A is 160-170 ℃, and the temperature of the secondary mixing is 160-170 ℃.
4. The forming preparation process of the crucible special for the cathode powder as claimed in claim 1, wherein the crucible mold in the step B is made of chromium molybdenum steel.
5. The forming preparation process of the crucible special for the cathode powder as claimed in claim 4, wherein the chromium molybdenum steel is 42 chromium molybdenum steel.
6. The forming preparation process of the crucible special for the cathode powder as claimed in claim 1, wherein the wall thickness of the crucible mold in the step B is more than or equal to 10cm.
7. The forming preparation process of the crucible special for the negative electrode powder as claimed in claim 1, wherein the pressing and forming in the step C adopts mechanical pressing equipment, and a pressing head of the mechanical pressing equipment adopts 42 chromium molybdenum steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211534878.4A CN115557732A (en) | 2022-12-02 | 2022-12-02 | Special crucible forming preparation process for cathode powder |
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| CN202211534878.4A CN115557732A (en) | 2022-12-02 | 2022-12-02 | Special crucible forming preparation process for cathode powder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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