CN113913812A - Preparation method of wear-resistant coating of hood - Google Patents
Preparation method of wear-resistant coating of hood Download PDFInfo
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- CN113913812A CN113913812A CN202111177911.8A CN202111177911A CN113913812A CN 113913812 A CN113913812 A CN 113913812A CN 202111177911 A CN202111177911 A CN 202111177911A CN 113913812 A CN113913812 A CN 113913812A
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- 238000000576 coating method Methods 0.000 title claims abstract description 64
- 239000011248 coating agent Substances 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000005253 cladding Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 17
- 239000011812 mixed powder Substances 0.000 claims abstract description 10
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 8
- 150000001875 compounds Chemical class 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 15
- 239000011324 bead Substances 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 239000002932 luster Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 229910003470 tongbaite Inorganic materials 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000011195 cermet Substances 0.000 abstract 1
- 239000011651 chromium Substances 0.000 description 32
- 239000012071 phase Substances 0.000 description 18
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 239000000956 alloy Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/06—Alloys based on chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
Abstract
The invention discloses a preparation method of a wear-resistant coating of a hood, which is characterized in that simple substance powder of Cr, Al and C or mixed powder of binary compounds of the simple substance powder is cladded with carbide (Cr) on the easy-to-wear part of the hood by a plasma cladding technology7C3) And cermet (Cr)2AlC) as the main component. The coating has good cladding process performance, can be metallurgically bonded with a blast cap base material, has low porosity, and has high hardness and good wear resistance.
Description
Technical Field
The invention belongs to the technical field of metal material plating, and particularly relates to a preparation method of a wear-resistant coating of a hood, which relates to a plasma cladding technology.
Background
The blast cap is an important accessory in a combustion system of a circulating fluidized bed boiler, is arranged on an air distribution plate and is mainly used for uniformly feeding air required by fluidized fuel into a boiler hearth so as to ensure that furnace charge in the boiler is normally fluidized.
The working condition of the blast cap is severe, the bed temperature of the circulating fluidized bed boiler is 800-900 ℃, even if fluidized air is cooled, the blast cap is averagely at a high temperature of about 500-600 ℃, and the local area is even close to the bed temperature; in addition, it must be able to withstand the erosion of the charge and the primary air. In the starting process of the boiler, under the working conditions of burning inferior coal and large-load operation, the corrosion and the abrasion of the blast caps are more serious, and the service life of part of the blast caps is less than one year. Therefore, the material for manufacturing the blast cap must comprehensively consider the high-temperature strength, the oxidation resistance and the abrasion resistance to ensure the stable operation of the blast cap so as to ensure the uniform air distribution and fluidization of the bed layer.
In order to ensure the stable operation of the blast cap, the common solution is to periodically inspect and replace the worn blast cap, or to manufacture the blast cap from a more wear-resistant and corrosion-resistant high alloy material. Both replacement and use of higher grade high alloy materials can add significant cost to the operation. The common materials of the hood comprise high-chromium heat-resistant stainless steel materials such as ZG30Cr26Ni5Re, ZG4Cr26Ni4Mn3NRe, A297HK and the like, so that the cost is high, and the common manufacturing process is casting with high energy consumption and high emission.
One effective way to solve this problem is to coat the surface of the hood with an abrasion-resistant coating of a specific composition and structure to improve the performance and prolong the service life of the hood. Most of the common powder materials for preparing the wear-resistant coating are metals and compounds thereof, the prepared coating is also a corresponding metal coating, the normal working condition temperature of the blast cap reaches or approaches the use limit of most of metal materials, and the common metal coating is not suitable for the severe working conditions of the blast cap. The metal ceramic composite coating, especially the metal ceramic composite coating taking carbide and boride as reinforcing phases, has wide application in the manufacturing and repairing of wear-resistant parts in the fields of aviation, aerospace, metallurgy, mines, petroleum, chemical industry and the like. The MAX phase material is ternary nano-layered high-performance carbide or nitride with a hexagonal lattice structure, and has a plurality of excellent characteristics of metal and ceramic, such as excellent electric and heat conduction, machining, thermal shock resistance, damage resistance, high temperature, oxidation resistance, corrosion resistance and the like. The common preparation process of the metal ceramic composite coating is prefabricated on the surface of a base material in an additional compounding mode, but the preparation process has the characteristics of complexity and high technical requirement, so that the performance and the application range of the coating are greatly influenced.
Disclosure of Invention
The invention aims to provide a preparation method of a wear-resistant coating of a hood, which can improve the wear resistance and corrosion resistance of the hood on the premise of not greatly increasing the cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a wear-resistant coating of a blast cap comprises the following steps:
1) cleaning the blast cap and preheating;
2) and cladding the elementary substance powder of Cr, Al and C or the mixed powder of binary compounds thereof on the preheated blast cap base material by a plasma cladding method.
In the above technical scheme:
in the step 1) of the process,
the method for cleaning the blast cap comprises the step of polishing the part needing cladding coating by using abrasive paper until the metallic luster is exposed. The iron-based material (such as 15CrMoG and 12Cr1MoVG) of the low alloy steel is used as the base material of the blast cap, the manufacturing cost of the blast cap is further reduced under the condition of ensuring high temperature resistance, the surface of the part to be clad is cleaned, and impurities such as rust and water can be prevented from being mixed into the coating to influence the performance of the coating.
The preheating method adopts plasma arc preheating to 100-150 ℃, prevents welding defects such as unfused and air holes, particularly near a starting welding point, reduces temperature difference stress between a base body and a welding bead, and avoids defects such as cracks.
In the step 2) of the process,
the mixed powder is preferably Cr: Al: C: 2 (0.75-0.95): 1 in molar ratio; preferably, the mixed powder is Cr or Cr3C2And a mixture of Al. Therefore, Cr is selected3C2Because the melting point of the simple substance C is higher, the simple substance C is not easy to melt during plasma cladding, a large amount of energy is consumed for melting, and the retention time period of a molten pool is not beneficial to fully performing the in-situ reaction; in addition, the density of the simple substance C is low, the uniformity of powder feeding is difficult to ensure, and meanwhile, the content of C finally entering the coating is low due to the fact that the C is easy to react with oxygen in the air to be ablated, and the MAX phase cannot be formed.
The particle size of the mixed powder is preferably 100-200 meshes. When cladding, the excessive granularity easily causes incomplete in-situ reaction and Cr2The defects of uneven powder feeding, poor coating (welding line) forming and no fusion between the coating (welding line) and the base material are easily caused by insufficient AlC MAX phase content and excessively small granularity.
The process conditions of the plasma cladding method are as follows: argon is used as ion gas, protective gas and powder feeding gas; the distance between the nozzles is 6-10 mm to ensure the rigidity of the plasma arc, the welding current is 240-280A, the ion gas flow is 3-5L/min, and the protective gas flow is 10-12L/min. Under the process condition, the proper welding heat input and fusion between coatings (welding beads) can be ensured; the argon is inert gas, so that the molten pool can be protected from being oxidized.
Furthermore, the plasma cladding method adopts a multi-layer and multi-channel welding bead arrangement mode, the thickness of each welding bead is 0.5-1.0 mm, 2-3 layers of welding are carried out, and the thickness of the finally obtained coating is 1-3 mm. Because the multilayer and multi-pass surfacing welding is adopted, and certain mutual diffusion (mutual diffusion of alloy elements of each layer of welding bead and the matrix) exists between the coating material and the matrix during plasma cladding, the content of the matrix elements contained in the coating is gradually reduced along the direction from the matrix to the outside, and the components and the tissues of the prepared coating are ensured to be in gradient distribution.
The invention has the beneficial effects that:
1) the coating prepared by the invention can be metallurgically bonded with the blast cap base material, the plasma cladding process performance is good, and the preparation process is simple; the coating structure is in dendritic growth characteristic, and the microhardness is 420-460 HV0.2 (an outermost overlaying layer); the coating has low porosity, high hardness and good wear resistance. By controlling Cr as hard phase in the coating7C3And Cr having a slightly low hardness and a high damage capacity2The ratio of AlC MAX phases to Cr can be obtained7C3Is a skeleton, Cr2The AlC MAX phase is a filled high-temperature-resistant, corrosion-resistant and wear-resistant coating with higher hardness and high toughness.
2) Cr prepared by the invention7C3、Cr2The AlC MAX phase functional gradient protective coating has uniform components and structure, large thickness and easily controlled process, thereby further reducing the microscopic defects in the coating, improving the compactness of the coating, reducing the internal stress of the coating and improving the bonding force of the protective coating.
3) The invention creatively adopts Cr and Cr with relatively low cost3C2Al powder as a deposition material. Does not need to prepare expensive Cr in advance2The AlC MAX phase powder material is used as a deposition material, and MAX phase powder does not need to be filled into a metal tube or an alloy tube, so that the wire rod with the MAX phase powder coated by the metal or the alloy is prepared. Thereby greatly reducing the cost of powder materials and correspondingly reducing the preparation cost of the coating. In addition, the MAX phase coating is formed by high-temperature annealing solid-phase reaction without depositing an original coating in advance. Simplifies the preparation process of the coating and reduces the uncontrollable property and cost of the preparation of the coating.
Drawings
FIG. 1 is an XRD pattern of the coating obtained in example 1.
FIG. 2 is a scanning electron micrograph (lower magnification) of the cross-sectional morphology of the coating obtained in example 1.
FIG. 3 is a scanning electron micrograph (high magnification) of the cross-sectional morphology of the coating obtained in example 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only preferred embodiments of the present invention, and not all embodiments.
Example 1
The preparation method of the wear-resistant coating of the blast cap comprises the following steps:
1) mixing Cr and Cr with the molar ratio of Cr to Al to C being 2:0.90:13C2Uniformly mixing the Al powder, and baking at 200 ℃ for 1 hour for later use, wherein the granularity of each powder is 100-200 meshes;
2) selecting a blast cap with a base material of an iron-based material (15CrMoG), cleaning the surface of a part to be clad, and exposing metallic luster;
3) adopting plasma cladding equipment to clad the mixed powder on a base material of the blast cap, and the main process comprises the following steps: the cladding distance is 7mm, the welding current is 250A, the ionic gas flow is 4L/min, and the protective gas flow is 12L/min; argon is adopted for ion gas, protective gas and powder feeding gas;
4) a multi-layer and multi-channel welding bead arrangement mode is adopted, namely the thickness of a welding bead is 0.5-1.0 mm, 3 layers are welded, and the thickness of a finally obtained coating is 1.5-3 mm.
FIG. 1 is an XRD pattern of the coating obtained in example 1, showing Cr in the coating2The AlC MAX phase is the main peak. FIGS. 2 and 3 are SEM pictures of the cross-sectional shapes of the coatings obtained in example 1, and as can be seen from FIG. 1, Cr of the outermost third coating2The AlC MAX phase content is high, the hardness is moderate (420-460 HV0.2), and the toughness is good; middle second layer coating Cr2Reduced AlC MAX phase content, Cr7C3The content is increased, and the hardness is increased; the first layer of the lower part is fully coatedThe diffusion zone has low hardness and good toughness, is beneficial to providing the bonding strength of the coating, and the three welding passes form a step coating. The key to control the welding process is Cr7C3Carbide and Cr2Relative content of AlC MAX phase, too high Cr7C3The carbide content can cause the brittleness of the coating to be increased, cracks to be increased and even the coating to be peeled off; cr (chromium) component2An excessively high AlC MAX content is advantageous for improving the toughness of the coating, but leads to insufficient hardness and reduced wear resistance.
Example 2
The present embodiment is different from embodiment 1 in that: in the step 1), the molar ratio of Cr to Al to C is adjusted to 2:0.75:1, so as to obtain the step coatings with different components. In the process of this example, the Al content is slightly low to suppress Cr2The content of AlC MAX phase is increased, and Cr is increased7C3And thereby adjusting the hardness of the step coating.
Example 3
The present embodiment is different from embodiment 1 in that: in the step 1), the molar ratio of Cr to Al to C is adjusted to 2:0.95:1, so as to obtain the step coatings with different components. In the process of this example, the Al content is slightly high to suppress Cr2The content of AlC MAX phase is increased, and Cr is increased7C3And thereby adjusting the hardness of the step coating. .
Example 4
The present embodiment is different from embodiment 1 in that: in the step 3), the cladding distance is 9mm, and the welding current is 280A. In the process of the embodiment, the welding heat input is high, and although the energy consumption is improved, the element diffusion is more uniform, so that the hardness of the step coating is adjusted.
Example 5
The present embodiment is different from embodiment 1 in that: in the step 3), the cladding distance is 6mm, and the welding current is 240A. In the process of this example, the weld heat input was low, but the hardness of the coating was still guaranteed to be within the expected range.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. The preparation method of the wear-resistant coating of the hood is characterized by comprising the following steps of:
1) cleaning the blast cap and preheating;
2) and cladding the elementary substance powder of Cr, Al and C or the mixed powder of binary compounds thereof on the preheated blast cap base material by a plasma cladding method.
2. The method of claim 1, wherein:
the method for cleaning the blast cap comprises the step of polishing the part needing cladding coating by using abrasive paper until the metallic luster is exposed.
3. The method of claim 1, wherein:
the preheating method is characterized in that plasma arcs are adopted for preheating to 100-150 ℃.
4. The method of claim 1, wherein:
the mixed powder is prepared from Cr: Al: C (2: 0.75-0.95: 1) in a molar ratio.
5. The method of claim 4, wherein:
the mixed powder is Cr or Cr3C2And a mixture of Al.
6. The production method according to claim 4 or 5, characterized in that:
the particle size of the mixed powder is 100-200 meshes.
7. The method of claim 1, wherein:
the process conditions of the plasma cladding method are as follows: argon is used as ion gas, protective gas and powder feeding gas; the nozzle distance is 6-10 mm, the welding current is 240-280A, the ion gas flow is 3-5L/min, and the protective gas flow is 10-12L/min.
8. The method of claim 1, wherein:
the plasma cladding method adopts a multi-layer and multi-channel welding bead arrangement mode, the thickness of each welding bead is 0.5-1.0 mm, 2-3 layers of welding are carried out, and the thickness of a finally obtained coating is 1-3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111177911.8A CN113913812B (en) | 2021-10-09 | Preparation method of wear-resistant coating of hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111177911.8A CN113913812B (en) | 2021-10-09 | Preparation method of wear-resistant coating of hood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113913812A true CN113913812A (en) | 2022-01-11 |
| CN113913812B CN113913812B (en) | 2024-04-26 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104496477A (en) * | 2014-12-17 | 2015-04-08 | 陕西科技大学 | Method for preparing high-purity Cr2AlC ceramic powder |
| CN109182951A (en) * | 2018-09-21 | 2019-01-11 | 河北工业大学 | A kind of plasma spraying prepares chromium-aluminium-carbon composite coating method |
| CN109869715A (en) * | 2019-02-22 | 2019-06-11 | 刘沁昱 | Slag leak-proof funnel cap and preparation method thereof and circulating fluidized bed boiler |
| CN112010307A (en) * | 2020-08-20 | 2020-12-01 | 电子科技大学 | Cr (chromium)2Application method of AlC material |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104496477A (en) * | 2014-12-17 | 2015-04-08 | 陕西科技大学 | Method for preparing high-purity Cr2AlC ceramic powder |
| CN109182951A (en) * | 2018-09-21 | 2019-01-11 | 河北工业大学 | A kind of plasma spraying prepares chromium-aluminium-carbon composite coating method |
| CN109869715A (en) * | 2019-02-22 | 2019-06-11 | 刘沁昱 | Slag leak-proof funnel cap and preparation method thereof and circulating fluidized bed boiler |
| CN112010307A (en) * | 2020-08-20 | 2020-12-01 | 电子科技大学 | Cr (chromium)2Application method of AlC material |
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