CN114230371A - Composite coating for improving corrosion resistance of sagger surface and prolonging service life - Google Patents
Composite coating for improving corrosion resistance of sagger surface and prolonging service life Download PDFInfo
- Publication number
- CN114230371A CN114230371A CN202111423466.9A CN202111423466A CN114230371A CN 114230371 A CN114230371 A CN 114230371A CN 202111423466 A CN202111423466 A CN 202111423466A CN 114230371 A CN114230371 A CN 114230371A
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- Prior art keywords
- sagger
- composite coating
- coating
- service life
- corrosion resistance
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
- C04B41/87—Ceramics
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5076—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with masses bonded by inorganic cements
- C04B41/5089—Silica sols, alkyl, ammonium or alkali metal silicate cements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D5/00—Supports, screens, or the like for the charge within the furnace
- F27D5/0006—Composite supporting structures
- F27D5/0012—Modules of the sagger or setter type; Supports built up from them
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Charging Or Discharging (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention provides a composite coating for improving the surface corrosion resistance of a sagger and prolonging the service life, which is prepared from the following raw materials in percentage by weight: 40-50% of lithium silicate solution, 10-20% of sodium silicate solution, 2-5% of PVA solution and 35-38% of mixed refractory material. The composite coating has good strong alkali resistance, permeability resistance and high temperature resistance, and a compact lithium silicate film formed after coating can greatly improve the corrosion of lithium ions on the inner surface of the sagger, thereby greatly prolonging the service life of the sagger, effectively overcoming the problems of lithium ion permeability and thermal expansion of the existing surface coating material caused by repeated use of a kiln, and being economical and practical.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a composite coating for improving the corrosion resistance of the surface of a sagger and prolonging the service life of the sagger.
Background
With the implementation of a low-carbon policy, the demand of green energy is more and more great, the battery capacity is continuously improved in industries such as power batteries, kiln furniture-saggars must be used for loading and drying anode material powder in the treatment process of the anode material, and the saggars are huge in use amount due to strong alkalinity of lithium hydroxide in the material and high drying temperature. The sagger used in the ternary nickel battery at present has the service life of 30 times on average with high quality. According to statistics, the number of saggars scrapped by domestic battery enterprises in one year is about 3000 thousands, and with the popularization of electric automobiles, the saggars can be rapidly improved to the existing level by 3 times in the next years, the weight of each saggar is more than 4kg, and according to the calculation, the number of the saggars used in the future can be increased to hundred million, and the consumed refractory materials are 4 hundred million tons. The manufacturing process of the sagger is that refractory materials are pressed and formed, the sintering temperature in a kiln is generally 1350 ℃, and more than 2 cubes of natural gas are used in each sagger on average. Therefore, the improvement of the service life of the sagger is not only a requirement of green economy, but also a requirement of enterprise competition.
At present, part of enterprises also adopt a coating mode, zirconium silicate is added into the coating, corundum materials are added into the coating to improve the corrosion resistance of the sagger, but the effect is not obvious, the average time of a sagger is improved to 30 times, secondary feeding or secondary pressing is carried out, the material cost consumption is high, the inner surface layer of the sagger is corroded mainly due to the fact that in a high-temperature environment, lithium ions permeate to cause the general surface layer to peel, cracking causes scrapping, the sagger substrate cracks, the damage accounts for a small amount, and therefore the key is to effectively improve the strong alkali corrosion resistance.
Disclosure of Invention
In view of the above, the invention aims to provide a composite coating for improving the corrosion resistance of the surface of a sagger and prolonging the service life, the composite coating has good strong alkali resistance, permeability resistance and high temperature resistance, and a compact lithium silicate film formed after coating can greatly improve the corrosion of lithium ions to the inner surface of the sagger, so that the service life of the sagger is greatly prolonged, the problem of lithium ion permeability and the problem of thermal expansion of the existing surface coating material caused by repeated use of a kiln are effectively solved, and the composite coating is economical and practical.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a composite coating for improving the surface corrosion resistance of a sagger and prolonging the service life is prepared from the following raw materials in percentage by weight: 40-50% of lithium silicate solution, 10-20% of sodium silicate solution, 2-5% of PVA solution and 35-38% of mixed refractory material.
Furthermore, the particle size of silicon oxide in the lithium silicate solution is less than 2 microns, the solution is clear and transparent, and the total proportion of the lithium silicate solution and the sodium silicate solution in the composite coating is 60%.
Furthermore, the mixed refractory material is one or a combination of several refractory materials of zirconium silicate, zirconia, fused corundum and magnesia powder, wherein the powder of the zirconium silicate, the zirconia and the fused corundum is required to be more than 325 meshes, and the powder with smaller granularity is preferred.
Further, zirconia powder is most preferred in the mixed refractory because it does not contain silica and because of the yttria stabilizer, the coefficient of expansion is minimized so as not to damage the lithium silicate film after thermal expansion, thereby resisting lithium ion attack.
The use method of the composite coating comprises the following steps:
step (1): sequentially putting a lithium silicate solution, a sodium silicate solution, 2-5% of a PVA solution and a mixed refractory material into a stirring barrel, and uniformly stirring to prepare a composite coating;
step (2): uniformly coating the composite coating prepared in the step (1) on the inner surface of the saggar blank, and controlling to minimize the Baume degree during spraying;
and (3): and (3) drying the composite coating sprayed in the step (2) by hot air, and sintering the dried sagger blank in a kiln to finish the coating and fixing of the composite coating.
Further, the coating mode in the step (2) comprises spraying, curtain coating and brush coating, wherein the Baume degree can be reduced by adding alcohol or water, the spraying is adjusted to be 20-25 Baume degree during spraying, the Baume degree is adjusted to be 25-35 during curtain coating, and the Baume degree is adjusted to be 35-45 during brush coating, so that a film with high density is formed.
Further, the drying temperature in the step (3) is 60-200 ℃.
Compared with the prior art, the composite coating has the following advantages:
the composite coating has good strong alkali resistance, permeability resistance and high temperature resistance, and a compact lithium silicate film formed after coating can greatly improve the corrosion of lithium ions on the inner surface of the sagger, thereby greatly prolonging the service life of the sagger, effectively overcoming the problems of lithium ion permeability and thermal expansion of the existing surface coating material caused by repeated use of a kiln, and being economical and practical.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs.
The present invention will be described in detail below.
Example 1
Mixing 45% of lithium silicate solution and 15% of sodium silicate solution, then adding 2% of PVA hydrolytic solution, then adding 38% of 400-mesh zirconia powder, and stirring for 2 hours; then the mixture is sprayed on the inner surface of the sagger blank by a spraying machine, and does not flow; then the mixture is sent into a kiln hot air recovery chamber for drying, and then is put into a kiln for sintering according to the prior art after being dried; the sintered sagger has uniform film forming on the inner surface, high density, good strength, 20 percent longer service life than the prior art, lower cost than the prior art and material saving.
Example 2
Aiming at the existing sagger scrapping repair, the corrosion layer is removed by a mechanical processing mode, such as shot blasting, rough turning and the like, and the thickness of the corrosion layer is about 0.5-2 mm; then directly spraying the coating; by adopting the mode, the rejection rate can be effectively reduced, and the surface shot blasting equipment and the spraying machine can be directly added in the positive battery enterprise, so that the enterprise cost is greatly reduced, the gas consumption is indirectly reduced, and the low-carbon economy is contributed.
Example 3
The sintering temperature of part of materials of lithium cobalt oxide batteries (used for computers and the like) is higher than 1050-; coating material preparation: 50% of lithium silicate, 10% of sodium silicate, 25% of zirconium oxide, 13% of magnesium oxide and 2% of PVA solution, uniformly mixing, adjusting the Baume degree to 35, and adopting a brush coating mode; then sintering the mixture and the green body together, wherein the thickness of the sintered coating is 0.2-0.3 micron, the surface is smooth and the coating is compact, and the service life of the sagger in the environment is prolonged from 15-18 times to 30 times.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The utility model provides an improve sagger surface corrosion resistance, improve life composite coating which characterized in that: the composite coating is prepared from the following raw materials in percentage by weight: 40-50% of lithium silicate solution, 10-20% of sodium silicate solution, 2-5% of PVA solution and 35-38% of mixed refractory material.
2. The composite coating for improving corrosion resistance and prolonging service life of the surface of a sagger as claimed in claim 1, wherein: the granularity of silicon oxide in the lithium silicate solution is less than 2 microns, the solution is clear and transparent, and the total proportion of the lithium silicate solution and the sodium silicate solution in the composite coating is 60%.
3. The composite coating for improving corrosion resistance and prolonging service life of the surface of a sagger as claimed in claim 1, wherein: the mixed refractory material is one or a combination of several refractory materials of zirconium silicate, zirconia, fused corundum and magnesia powder, wherein the powder of the zirconium silicate, the zirconia and the fused corundum is required to have more than 325 meshes, and the powder with smaller granularity is preferred.
4. The composite coating for improving corrosion resistance and prolonging service life of the surface of a sagger as claimed in claim 3, wherein: the zirconia powder is most preferred in the mixed refractory because it does not contain silica and because of the yttria stabilizer, the coefficient of expansion is minimal so as not to damage the lithium silicate film after thermal expansion and thereby resist attack by lithium ions.
5. A method of using the composite coating for improving corrosion resistance and increasing service life of a sagger surface as claimed in any one of claims 1-4, wherein: the method comprises the following steps:
step (1): sequentially putting a lithium silicate solution, a sodium silicate solution, 2-5% of a PVA solution and a mixed refractory material into a stirring barrel, and uniformly stirring to prepare a composite coating;
step (2): uniformly coating the composite coating prepared in the step (1) on the inner surface of the saggar blank, and controlling to minimize the Baume degree during spraying;
and (3): and (3) drying the composite coating sprayed in the step (2) by hot air, and sintering the dried sagger blank in a kiln to finish the coating and fixing of the composite coating.
6. The use method of the composite coating for improving the corrosion resistance of the surface of the sagger and prolonging the service life of the sagger as claimed in claim 5, wherein: the coating mode in the step (2) comprises spraying, curtain coating and brush coating, alcohol or water is added to reduce the Baume degree, the Baume degree is adjusted to be 20-25 Baume degree during spraying, the Baume degree is adjusted to be 25-35 during curtain coating, and the Baume degree is adjusted to be 35-45 during brush coating, so that the film with high density is formed.
7. The use method of the composite coating for improving the corrosion resistance of the surface of the sagger and prolonging the service life of the sagger as claimed in claim 5, wherein: the drying temperature in the step (3) is 60-200 ℃.
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| CN202111423466.9A CN114230371B (en) | 2021-11-26 | 2021-11-26 | Composite coating for improving corrosion resistance of sagger surface and prolonging service life |
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| CN202111423466.9A CN114230371B (en) | 2021-11-26 | 2021-11-26 | Composite coating for improving corrosion resistance of sagger surface and prolonging service life |
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| CN114230371A true CN114230371A (en) | 2022-03-25 |
| CN114230371B CN114230371B (en) | 2023-04-18 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115286430A (en) * | 2022-08-16 | 2022-11-04 | 广东邦普循环科技有限公司 | Sagger repairing slurry, preparation method thereof, sagger and sagger repairing method |
| CN115710837A (en) * | 2022-11-11 | 2023-02-24 | 天津科技大学 | Preparation method of impregnated paper with high water vapor barrier property |
| CN116283317A (en) * | 2023-03-08 | 2023-06-23 | 湖南金铠新材料科技股份有限公司 | Sagger for sintering sodium ion battery anode material and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115286430A (en) * | 2022-08-16 | 2022-11-04 | 广东邦普循环科技有限公司 | Sagger repairing slurry, preparation method thereof, sagger and sagger repairing method |
| CN115710837A (en) * | 2022-11-11 | 2023-02-24 | 天津科技大学 | Preparation method of impregnated paper with high water vapor barrier property |
| CN115710837B (en) * | 2022-11-11 | 2023-12-01 | 天津科技大学 | Preparation method of impregnated paper with high water vapor barrier property |
| CN116283317A (en) * | 2023-03-08 | 2023-06-23 | 湖南金铠新材料科技股份有限公司 | Sagger for sintering sodium ion battery anode material and preparation method thereof |
| CN116283317B (en) * | 2023-03-08 | 2023-10-24 | 湖南金铠新材料科技股份有限公司 | Sagger for sintering sodium ion battery anode material and preparation method thereof |
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| CN114230371B (en) | 2023-04-18 |
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