CN117164386A - Coating for reducing carburization of graphite crucible and preparation method thereof - Google Patents
Coating for reducing carburization of graphite crucible and preparation method thereof Download PDFInfo
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- CN117164386A CN117164386A CN202311140687.4A CN202311140687A CN117164386A CN 117164386 A CN117164386 A CN 117164386A CN 202311140687 A CN202311140687 A CN 202311140687A CN 117164386 A CN117164386 A CN 117164386A
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- graphite crucible
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- calcium aluminate
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 85
- 239000010439 graphite Substances 0.000 title claims abstract description 85
- 238000000576 coating method Methods 0.000 title claims abstract description 51
- 239000011248 coating agent Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 22
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000001354 calcination Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 7
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 238000005507 spraying Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 26
- 239000011247 coating layer Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 28
- PTXMVOUNAHFTFC-UHFFFAOYSA-N alumane;vanadium Chemical compound [AlH3].[V] PTXMVOUNAHFTFC-UHFFFAOYSA-N 0.000 description 28
- 238000003723 Smelting Methods 0.000 description 21
- 229910045601 alloy Inorganic materials 0.000 description 15
- 239000000956 alloy Substances 0.000 description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 238000010304 firing Methods 0.000 description 6
- 239000011268 mixed slurry Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 229910001069 Ti alloy Inorganic materials 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 229910003923 SiC 4 Inorganic materials 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000006255 coating slurry Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- 241001062472 Stokellia anisodon Species 0.000 description 2
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Abstract
The invention discloses a coating for reducing carburization of a graphite crucible and a preparation method thereof, wherein the preparation method comprises the following steps: s1, taking high-purity alumina as a coating material, taking high-purity calcium aluminate as a binder, and mixing to prepare slurry; s2, spraying the slurry prepared in the step S1 on the inner surface of the unfired graphite crucible; s3, drying at normal temperature, and calcining the crucible at high temperature to obtain the graphite crucible with the coating inside. According to the invention, the coating material and the adhesive are mixed to prepare slurry and coated on the inner surface of the graphite crucible, so that the service life of the graphite crucible is prolonged, the carburization rate of the graphite crucible is slowed down, and the product quality is improved.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to a coating for reducing carburization of a graphite crucible and a preparation method thereof.
Background
The vanadium-aluminum alloy is a main intermediate alloy for preparing titanium alloys Ti-6Al-4V and Ti-8Al-1Mo-1V of an aircraft skeleton and an engine, vanadium in the titanium alloy is added in the form of the vanadium-aluminum alloy, and the vanadium-aluminum alloy is mainly used for preparing the Ti-6Al-4V in China. The quality of the vanadium-titanium alloy prepared by remelting the vanadium-aluminum alloy and the metallic titanium directly influences the performance of the titanium alloy for aerospace.
Most of vanadium-aluminum alloy adopts self-propagating combustion reaction of vanadium flakes and aluminum particles, smelting adopts a graphite crucible, and a method of standing and cooling in air is adopted after the smelting is finished. And a graphite crucible is adopted to smelt the high-quality vanadium-aluminum alloy, and the alloy is rapidly cooled in the high-heat-conductivity graphite, so that the segregation of the alloy is reduced, and the alloy is more compact. Meanwhile, the graphite crucible is carburized in the smelting process, so that the carbon content of the high-quality vanadium-aluminum alloy exceeds the standard, and the product quality is reduced.
At present, studies on graphite protection, such as CN112707733a, are made by oxidation of Al at high temperatures 4 SiC 4 Dispersing ceramic into graphite crucible with regenerated graphite powder as raw material, and in high-temperature oxidizing atmosphere, non-oxide Al on the surface of graphite crucible 4 SiC 4 The ceramic particles are oxidized to form oxide Al at 1300 DEG C 2 O 3 Film, formation of oxide Al at 1600 DEG C 2 O 3 And aluminosilicate SiO 2 -Al 2 O 3 A film covering the surface of the graphite crucible and at the same time, being non-oxide of Al 4 SiC 4 The volume expansion generated when the ceramic particles are oxidized can fill and seal the gas channel in the material, and the graphite crucible material is effectively protected through the isolation of the film and the sealing of the gas channel, so that the graphite crucible achieves the technical effects of self-healing and oxidation resistance; CN111440010a relates to a high purity graphite tool with an alumina coating, and a method for making and using the same, the high purity graphite tool comprising a high purity graphite substrate and an alumina coating, the oxidationThe aluminum coating is coated on the surface of the high-purity graphite substrate, the graphite purity of the high-purity graphite substrate is more than or equal to 4N, wherein the aluminum oxide coating is prepared by adopting a spraying method, and the high-purity graphite substrate is particularly suitable for smelting and casting high-purity aluminum with the purity of more than or equal to 5N. The high-purity graphite tool has the advantages that the bonding strength of the alumina coating and the high-purity graphite matrix is high, the alumina coating is not easy to peel off, the contact between the high-purity graphite matrix and the high-purity aluminum liquid is effectively prevented, and the purity of the high-purity aluminum liquid is ensured to be always above 5N; in addition, even if the high-purity graphite matrix is contacted with the high-purity aluminum liquid after long-term use, the impurity elements of the high-purity graphite matrix are very trace, so that the purity of the high-purity aluminum liquid is further ensured; CN113981277B proposes a lining material of a vanadium-aluminum alloy smelting furnace, a production method and a vanadium-aluminum alloy smelting method, wherein the lining material comprises vanadium-aluminum alloy powder, and the chemical composition of the vanadium-aluminum alloy powder comprises 43-76 wt% of V and 24-57 wt% of Al.
Although the above methods have been used for preparing coatings on crucibles, the coatings prepared by these methods do not solve the problem of carburization of graphite crucibles, and therefore development of an efficient and low-cost method for preparing anti-carburization coatings on graphite crucibles is highly desired.
Disclosure of Invention
The invention mainly aims to provide a coating for reducing carburizing of a graphite crucible and a preparation method thereof, wherein vanadium-aluminum alloy powder with specific chemical components is used as a lining material to be filled at the bottom and around a magnesia knotting furnace or a graphite crucible smelting furnace, a novel vanadium-aluminum alloy smelting furnace is manufactured, the phenomenon that an alloy melt is directly contacted with an O-or C-containing furnace body to introduce impurities in the smelting process can be avoided, meanwhile, the lining material can absorb O and N by itself to prevent the O and N from diffusing into the alloy in the cooling process, so that the content of O and N in the alloy can be effectively reduced, and the quality of the vanadium-aluminum alloy is improved.
According to some embodiments of the present invention, a method for preparing a coating for reducing carburization of a graphite crucible is provided, comprising the steps of:
s1, taking high-purity alumina as a coating material, taking high-purity calcium aluminate as a binder, and mixing to prepare slurry;
s2, spraying the slurry prepared in the step S1 on the inner surface of the unfired graphite crucible;
s3, drying at normal temperature, and calcining the crucible at high temperature to obtain the graphite crucible with the coating inside.
In the embodiment of the invention, in the step S1, al in the high-purity alumina is calculated according to the mass percent 2 O 3 ≥99.5％，Fe≤0.1％，Si≤0.1％，Mg≤0.1％。
In the embodiment of the invention, in the step S1, the content of the Al in the high-purity calcium aluminate is 49 percent or less in percentage by mass 2 O 3 ≤53％，29％≤CaO≤31％，Fe≤0.1％，Si≤0.1％。
In an embodiment of the invention, the granularity of the high-purity aluminum oxide and the high-purity calcium aluminate is 200-380 meshes.
In the embodiment of the invention, the mass ratio of the high-purity aluminum oxide to the pure calcium aluminate is 1:0.4-1.2.
In an embodiment of the present invention, the thickness of the coating layer on the surface of the graphite crucible is 0.2 to 20mm.
In the embodiment of the invention, the drying time at the normal temperature is 12-72 h.
In an embodiment of the present invention, the high temperature condition is 600 ℃ to 1400 ℃.
In an embodiment of the present invention, the calcination time under the high temperature condition is 6 to 24 hours.
In addition, the embodiment of the invention also discloses a coating for reducing carburization of the graphite crucible, which is prepared by adopting any one of the preparation methods.
By adopting the technical scheme, the invention has at least the following beneficial effects:
according to the coating for reducing carburization of the graphite crucible and the preparation method thereof, vanadium-aluminum alloy powder with specific chemical components is used as a lining material to be filled at the bottom and around a magnesia knotting furnace or a graphite crucible smelting furnace, a novel vanadium-aluminum alloy smelting furnace is manufactured, impurities can be prevented from being introduced due to direct contact between an alloy melt and an O-or C-containing furnace body in the smelting process, meanwhile, the lining material can absorb O and N by itself to prevent the O and N from diffusing into the alloy in the cooling process, so that the content of O and N in the alloy can be effectively reduced, and the quality of the vanadium-aluminum alloy is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 illustrates a process flow diagram of a method of preparing a coating for reducing carburization of a graphite crucible in accordance with some embodiments of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
It should be noted that, in the embodiments of the present invention, all the expressions "first" and "second" are used to distinguish two entities with the same name but different entities or different parameters, and it is noted that the "first" and "second" are only used for convenience of expression, and should not be construed as limiting the embodiments of the present invention, and the following embodiments are not described one by one.
Most of vanadium-aluminum alloy adopts self-propagating combustion reaction of vanadium flakes and aluminum particles, smelting adopts a graphite crucible, and a method of standing and cooling in air is adopted after the smelting is finished. And a graphite crucible is adopted to smelt the high-quality vanadium-aluminum alloy, and the alloy is rapidly cooled in the high-heat-conductivity graphite, so that the segregation of the alloy is reduced, and the alloy is more compact. Meanwhile, the graphite crucible is carburized in the smelting process, so that the carbon content of the high-quality vanadium-aluminum alloy exceeds the standard, and the product quality is reduced.
Some embodiments of the invention disclose a method of preparing a coating for reducing carburization of a graphite crucible, comprising the steps of:
s1, taking high-purity alumina as a coating material, taking high-purity calcium aluminate as a binder, and mixing to prepare slurry;
s2, spraying the slurry prepared in the step S1 on the inner surface of the unfired graphite crucible;
s3, drying at normal temperature, and calcining the crucible at high temperature to obtain the graphite crucible with the coating inside.
In the step S1, the high-purity alumina contains Al in percentage by mass 2 O 3 ≥99.5％，Fe≤0.1％，Si≤0.1％，Mg≤0.1％。
In the step S1, the content of Al in the high-purity calcium aluminate is less than or equal to 49% by mass 2 O 3 ≤53％，29％≤CaO≤31％，Fe≤0.1％，Si≤0.1％。
The vanadium-aluminum alloy powder has the characteristics of low impurity content, high hardness and high melting point, and can obviously improve the high temperature resistance of the coating slurry when being used as the coating material.
The high-purity calcium aluminate is used as a binder, so that the adhesiveness of the coating slurry can be improved, the adhesiveness of the coating slurry and the graphite crucible is improved, meanwhile, the influence on the components of the alloy in the high-temperature aluminothermic reduction reaction process is small, and the calcium aluminate is high in melting point and not easy to melt, so that the calcium aluminate cannot be doped in the alloy.
The granularity of the high-purity aluminum oxide and the high-purity calcium aluminate is 200-380 meshes. Crushing to proper granularity can raise the reaction speed and speed.
The mass ratio of the high-purity aluminum oxide to the pure calcium aluminate is 1:0.4-1.2.
The thickness of the coating on the surface of the graphite crucible is 0.2-20 mm.
The drying time at normal temperature is 12-72 h.
The high temperature condition is 600-1400 ℃.
The calcination time under the high temperature condition is 6-24 hours.
In addition, the embodiment of the invention also discloses a coating for reducing carburization of the graphite crucible, which is prepared by adopting any one of the preparation methods.
According to the invention, the coating material and the adhesive are mixed to prepare slurry, and the slurry is coated on the inner surface of the graphite crucible, so that the service life of the graphite crucible is prolonged, the carburization rate of the graphite crucible is slowed down, and the product quality is improved.
Example 1
1. The high-purity alumina and the high-purity calcium aluminate which are raw materials with the granularity of 240 meshes are mixed according to the weight ratio of 1:0.8, and then a proper amount of water is added for mixing to form the slurry.
2. The mixed slurry was coated on the inner surface of a graphite crucible to form a coating layer having a thickness of 5 mm.
3. The coating was dried at room temperature for 48h.
4. And firing the graphite crucible at 1200 ℃ for 8 hours to obtain the graphite crucible with the coating inside.
5. And smelting the vanadium-aluminum alloy by adopting a graphite crucible with a lining containing a coating, wherein the content of C is 0.07%.
Example 2
1. The high-purity alumina and the high-purity calcium aluminate which pass through the raw materials with 240 meshes are mixed according to the weight ratio of 1:0.9, and then a proper amount of water is added for mixing to form the slurry.
2. The mixed slurry was coated on the inner surface of a graphite crucible to form a coating layer having a thickness of 8 mm.
3. The coating was dried at room temperature for 72h.
4. And firing the graphite crucible at 1200 ℃ for 8 hours to obtain the graphite crucible with the coating inside.
5. And smelting the vanadium-aluminum alloy by adopting a graphite crucible with a lining containing a coating, wherein the content of C is 0.05 percent.
Example 3
1. The high-purity alumina and the high-purity calcium aluminate which are raw materials with the granularity of 240 meshes are mixed according to the weight ratio of 1:1, and then a proper amount of water is added for mixing to form slurry.
2. The mixed slurry was coated on the inner surface of a graphite crucible to form a coating layer having a thickness of 5 mm.
3. The coating was dried at room temperature for 48h.
4. And firing the graphite crucible at 1200 ℃ for 8 hours to obtain the graphite crucible with the coating inside.
5. And smelting the vanadium-aluminum alloy by adopting a graphite crucible with a lining containing a coating, wherein the content of C is 0.06%.
Example 4
1. The high-purity alumina and the high-purity calcium aluminate which are raw materials with the granularity of 240 meshes are mixed according to the weight ratio of 1:0.8, and then a proper amount of water is added for mixing to form the slurry.
2. The mixed slurry was coated on the inner surface of a graphite crucible to form a coating layer having a thickness of 8 mm.
3. The coating was dried at room temperature for 72h.
4. And placing the graphite crucible into a graphite crucible with a lining containing a coating layer after firing at 1200 ℃ for 8 hours.
5. And smelting the vanadium-aluminum alloy by adopting a graphite crucible with a lining containing a coating, wherein the content of C is 0.06%.
Comparative example 1
1. Raw materials of high-purity alumina with the granularity of 240 meshes and high-purity calcium aluminate are mixed according to the weight ratio of 1:0.8, and then a proper amount of water is added for mixing to form slurry.
2. The mixed slurry was coated on the inner surface of a graphite crucible to form a coating layer having a thickness of 0mm.
3. The coating was dried at room temperature for 72h.
4. And firing the graphite crucible at 1200 ℃ for 8 hours to obtain the graphite crucible with the coating inside.
5. And smelting the vanadium-aluminum alloy by adopting a graphite crucible with a lining containing a coating, wherein the content of C is 0.15%.
Comparative example 2
1. The high-purity alumina and the high-purity calcium aluminate which are raw materials with the granularity of 240 meshes are mixed according to the weight ratio of 1:0.8, and then a proper amount of water is added for mixing to form the slurry.
2. The mixed slurry was coated on the inner surface of a graphite crucible to form a coating layer having a thickness of 1 mm.
3. The coating was dried at room temperature for 72h.
4. And firing the graphite crucible at 1200 ℃ for 8 hours to obtain the graphite crucible with the coating inside.
5. And smelting the vanadium-aluminum alloy by adopting a graphite crucible with a lining containing a coating, wherein the content of C is 0.12%.
TABLE 1 content/%of vanadium-aluminum alloys examples and comparative examples C
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | |
| C content | 0.07 | 0.05 | 0.06 | 0.06 | 0.15 | 0.12 |
It should be noted that, each component or step in each embodiment may be intersected, replaced, added, and deleted, and therefore, the combination formed by these reasonable permutation and combination transformations shall also belong to the protection scope of the present invention, and shall not limit the protection scope of the present invention to the embodiments.
The foregoing is an exemplary embodiment of the present disclosure, and the order in which the embodiments of the present disclosure are disclosed is merely for the purpose of description and does not represent the advantages or disadvantages of the embodiments. It should be noted that the above discussion of any of the embodiments is merely exemplary and is not intended to suggest that the scope of the disclosure of embodiments of the invention (including the claims) is limited to these examples and that various changes and modifications may be made without departing from the scope of the invention as defined in the claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Those of ordinary skill in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the invention, including the claims, is limited to such examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of an embodiment of the invention, and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, and the like, which are made within the spirit and principles of the embodiments of the invention, are included within the scope of the embodiments of the invention.
Claims (10)
1. The preparation method of the coating for reducing carburization of the graphite crucible is characterized by comprising the following steps of:
s1, taking high-purity alumina as a coating material, taking high-purity calcium aluminate as a binder, and mixing to prepare slurry;
s2, spraying the slurry prepared in the step S1 on the inner surface of the unfired graphite crucible;
s3, drying at normal temperature, and calcining the crucible at high temperature to obtain the graphite crucible with the coating inside.
2. The method according to claim 1, wherein in step S1, al in the high purity alumina is calculated by mass percent 2 O 3 ≥99.5％，Fe≤0.1％，Si≤0.1％，Mg≤0.1％。
3. According to claim 2The preparation method is characterized in that in the step S1, the content of Al in the high-purity calcium aluminate is less than or equal to 49% by mass 2 O 3 ≤53％，29％≤CaO≤31％，Fe≤0.1％，Si≤0.1％。
4. The method according to claim 1, wherein the high purity alumina and high purity calcium aluminate have a particle size of 200 to 380 mesh.
5. The preparation method according to claim 1, wherein the mass ratio of the high-purity alumina to the pure calcium aluminate is 1:0.4-1.2.
6. The method according to claim 1, wherein the thickness of the coating layer on the surface of the graphite crucible is 0.2 to 20mm.
7. The method according to claim 1, wherein the drying time at room temperature is 12 to 72 hours.
8. The method according to claim 1, wherein the high temperature condition is 600 ℃ to 1400 ℃.
9. The method according to claim 1, wherein the calcination time under high temperature conditions is 6 to 24 hours.
10. A coating for reducing carburization of a graphite crucible, characterized in that it is produced by the method of any one of claims 1 to 9.
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| CN202311140687.4A CN117164386A (en) | 2023-09-05 | 2023-09-05 | Coating for reducing carburization of graphite crucible and preparation method thereof |
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| CN202311140687.4A CN117164386A (en) | 2023-09-05 | 2023-09-05 | Coating for reducing carburization of graphite crucible and preparation method thereof |
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| CN117164386A true CN117164386A (en) | 2023-12-05 |
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