CN110981511A - High-temperature-corrosion-resistant sagger and preparation method thereof - Google Patents
High-temperature-corrosion-resistant sagger and preparation method thereof Download PDFInfo
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- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
Abstract
The invention discloses a high-temperature corrosion resistant sagger and a preparation method thereof, belonging to the field of materials. Comprises 5-10 parts of mullite, 30-50 parts of silicon carbide, 20-30 parts of silicon dioxide, 1-5 parts of nano titanium, 5-10 parts of ceramic particles, 1-5 parts of zirconia, 3-5 parts of silicon boride and 1-5 parts of alumina. The preparation method comprises the steps of melting silicon dioxide; adding mullite, silicon carbide, nano titanium and ceramic particles in parts by weight under the protection of nitrogen, and fully mixing zirconia, silicon boride and alumina to obtain high-temperature slurry; and forming, sintering and cooling the high-temperature slurry to obtain the high-temperature-resistant high-performance ceramic material. The high-temperature-resistant sagger has good corrosion-resistant and high-temperature-resistant effects, can effectively improve the thermal stability of the material, greatly reduces the re-burning linear shrinkage rate of the refractory material, improves the fire resistance of the sagger, and prolongs the service life of the sagger; the service life of the sagger is 2.8-3 times longer than that of the conventional common sagger.
Description
Technical Field
The invention relates to the field of materials, in particular to a high-temperature corrosion resistant sagger and a preparation method thereof.
Background
Silicon carbide is chemically stable, has a high thermal conductivity, a small thermal expansion coefficient and good wear resistance, for example: the silicon carbide powder is coated on the inner wall of a water turbine impeller or a cylinder body by a special process, so that the wear resistance of the water turbine impeller or the cylinder body can be improved, and the service life of the water turbine impeller or the cylinder body is prolonged by 1-2 times; the high-grade refractory material has the advantages of thermal shock resistance, small volume, light weight, high strength and good energy-saving effect. The low-grade silicon carbide (containing SiC about 85%) is an excellent deoxidizer, and can be used for speeding up steel-making, easily controlling chemical composition and raising steel quality. In addition, silicon carbide is also used in great quantity to make silicon carbide rod for electric heating element. Therefore, in order to improve the high-temperature resistance, silicon carbide is often used for preparing the saggar of the lithium battery positive electrode material, so that the high-temperature resistance of the saggar is improved. However, the sagger of the lithium battery positive electrode material still has the problem of poor erosion resistance, the lithium battery positive electrode material for roasting is mostly in a powder shape and has strong permeability, lithium ions in the material belong to strong alkaline substances, the strong alkaline substances have strong erosion to the sagger material, and in the roasting process of the lithium battery positive electrode material, because the lithium ions can separate out ions such as Si, Al and Mg in the sagger in the contact process of the lithium ions and the sagger, the microstructure of the sagger is damaged, the sagger is eroded, and the service life of the sagger is obviously shortened. Meanwhile, the saggar is repeatedly used at the high temperature of 2000-2500 ℃, and can be discarded after being used for 20-30 times. Meanwhile, because the oxidation performance of the oxide in the sagger is high, and the sagger also has the characteristics of strong acid and strong alkali, the sagger is easy to corrode. The service life of the sagger is greatly reduced due to high-temperature strong corrosion.
At present, in order to improve the corrosion resistance of the sagger, a common mode is to coat a layer of anticorrosive material on the surface of the sagger; the silicon carbide coating disclosed in publication No. CN110452605A comprises 30-40% of silicon carbide powder, 20-30% of waterborne polyurethane, 10-20% of polyacrylate, 5-15% of organic metal salt, 1-10% of attapulgite, 1-5% of cellulose derivative, 1-5% of water-based wetting agent and 1-5% of methanol. In the high temperature reaction of the sagger, the crystal water in the organic matter is easy to evaporate, and the organic matter is in a molten state; the coating is easy to fall off, and the anti-corrosion effect is influenced; meanwhile, the dropped coating affects the conductivity of the electrode. The sagger material mainly comprises 8-10 parts of kaolin, 7-9 parts of talc, 4-6 parts of alumina, 22-28 parts of corundum with the particle size of 10-40 mu m, 45-58 parts of corundum with the particle size of 0.1-0.8mm, 18-30 parts of 500-mesh silicon carbide with the particle size of 300-; the talc contains 55% by mass of silica and 35% by mass of magnesium oxide. The preparation method comprises the steps of mixing water, and simultaneously adding a bonding agent, wherein the bonding agent is pulp waste liquid or polyvinyl alcohol or dextrin. Although the binding agent has the standing function at normal temperature, the binding agent is easy to be pasted at high temperature, inorganic matters are difficult to be bonded together, and the quality of the sagger is reduced.
In summary, in the prior art, although silicon carbide is used for corrosion prevention and high temperature resistance of the saggar, the silicon carbide corrosion-resistant material used as a coating mode is easy to fall off, and the corrosion prevention effect is influenced; the additive sagger has poor adhesive effect, and gaps and bubbles are easily generated, so that the quality of the sagger is influenced.
Disclosure of Invention
In order to solve the above problems, the present invention proposes a sagger capable of withstanding ultra-high temperatures while improving corrosion resistance.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the high-temperature corrosion resistant sagger comprises the following components in parts by weight: 5-10 parts of mullite, 30-50 parts of silicon carbide, 20-30 parts of silicon dioxide, 1-5 parts of nano titanium, 5-10 parts of ceramic particles, 1-5 parts of zirconium oxide, 3-5 parts of silicon boride and 1-5 parts of aluminum oxide.
Further, the high-temperature corrosion resistant sagger comprises the following components in parts by weight: 8-10 parts of mullite, 40-50 parts of silicon carbide, 25-30 parts of silicon dioxide, 2-3 parts of nano titanium, 5-8 parts of ceramic particles, 1-3 parts of zirconium oxide, 3-4 parts of silicon boride and 2-3 parts of aluminum oxide.
Further, the high-temperature corrosion resistant sagger comprises the following components in parts by weight: 10 parts of mullite, 45 parts of silicon carbide, 28 parts of nano silicon dioxide, 2.5 parts of nano titanium, 6 parts of ceramic particles, 2 parts of zirconia, 3.5 parts of silicon boride and 2 parts of alumina.
Further, the particle size of the mullite is 400-500 meshes.
Further, the particle size of the silicon carbide is 400-500 meshes.
Further, the particle size of the ceramic particles is 150-180 meshes.
The preparation method of the high-temperature corrosion resistant sagger comprises the following steps:
(1) melting silicon dioxide; adding mullite, silicon carbide, nano titanium and ceramic particles in parts by weight under the protection of nitrogen, and fully mixing zirconia, silicon boride and alumina to obtain high-temperature slurry;
(2) and pouring the high-temperature slurry into a sagger mold for molding, firing the molded green blank in a sintering furnace under the protection of nitrogen to obtain the sagger, and cooling to room temperature.
Further, the sintering temperature in the step (2) is 1350-.
The high-temperature corrosion resistant sagger and the preparation method thereof have the beneficial effects that:
(1) the method takes silicon carbide as a base material, and mullite, nano titanium, zirconia and silicon boride are added simultaneously; the coating has good anti-corrosion effect and can bear high temperature of more than 1500 ℃;
(2) in the preparation method, fused silicon dioxide is used as a solvent and is mixed with other materials; good fluidity, uniform mixing, good connectivity among the substances after cooling, less air bubbles and excellent sagger quality.
(3) The added material has good anticorrosion effect and high temperature resistance, and particularly has the advantages of effectively improving the thermal stability of the material, greatly reducing the re-firing line shrinkage rate of the refractory material, improving the refractory performance of the sagger and prolonging the service life of the sagger by mixing silicon carbide, zirconium oxide and silicon boride; the service life of the sagger is 2.8-3 times longer than that of the conventional common sagger.
Detailed Description
The present invention will be described in further detail with reference to the following examples.
Example 1
The high-temperature corrosion resistant sagger comprises the following components in parts by weight: 5 parts of mullite, 30 parts of silicon carbide, 20 parts of nano silicon dioxide, 1 part of nano titanium, 5 parts of ceramic particles, 1 part of zirconia, 3 parts of silicon boride and 1 part of alumina.
The grain diameter of the mullite is 500 meshes;
the grain diameter of the silicon carbide is 500 meshes;
the particle size of the ceramic particles is 150 meshes;
the preparation method of the high-temperature corrosion resistant sagger in the embodiment comprises the following steps:
(1) melting silicon dioxide; adding mullite, silicon carbide, nano titanium and ceramic particles in parts by weight under the protection of nitrogen, and fully mixing zirconia, silicon boride and alumina to obtain high-temperature slurry;
(2) and pouring the high-temperature slurry into a sagger mold for molding, sintering the molded green body in a sintering furnace at the temperature of 1350-1400 ℃ in a nitrogen environment to obtain the sagger, and cooling to room temperature.
Example 2
The high-temperature corrosion resistant sagger comprises the following components in parts by weight: 10 parts of mullite, 50 parts of silicon carbide, 30 parts of nano silicon dioxide, 5 parts of nano titanium, 10 parts of ceramic particles, 5 parts of zirconia, 5 parts of silicon boride and 1 part of alumina.
The grain diameter of the mullite is 500 meshes;
the grain diameter of the silicon carbide is 500 meshes;
the particle size of the ceramic particles is 150 meshes;
the preparation method of the high-temperature corrosion resistant sagger in the embodiment comprises the following steps:
(1) melting silicon dioxide; adding mullite, silicon carbide, nano titanium and ceramic particles in parts by weight under the protection of nitrogen, and fully mixing zirconia, silicon boride and alumina to obtain high-temperature slurry;
(2) and pouring the high-temperature slurry into a sagger mold for molding, sintering the molded green body in a sintering furnace at the temperature of 1350-1400 ℃ in a nitrogen environment to obtain the sagger, and cooling to room temperature.
Example 3
The high-temperature corrosion resistant sagger comprises the following components in parts by weight: 6 parts of mullite, 35 parts of silicon carbide, 22 parts of nano silicon dioxide, 4 parts of nano titanium, 8 parts of ceramic particles, 4 parts of zirconia, 5 parts of silicon boride and 2 parts of alumina.
The grain diameter of the mullite is 500 meshes;
the grain diameter of the silicon carbide is 500 meshes;
the particle size of the ceramic particles is 150 meshes;
the preparation method of the high-temperature corrosion resistant sagger in the embodiment comprises the following steps:
(1) melting silicon dioxide; adding mullite, silicon carbide, nano titanium and ceramic particles in parts by weight under the protection of nitrogen, and fully mixing zirconia, silicon boride and alumina to obtain high-temperature slurry;
(2) and pouring the high-temperature slurry into a sagger mold for molding, sintering the molded green body in a sintering furnace at the temperature of 1450 and 1500 ℃ in a nitrogen environment to obtain the sagger, and cooling to room temperature.
Example 4
The high-temperature corrosion resistant sagger comprises the following components in parts by weight: 8 parts of mullite, 40 parts of silicon carbide, 25 parts of nano silicon dioxide, 2 parts of nano titanium, 5 parts of ceramic particles, 3 parts of zirconia, 4 parts of silicon boride and 2 parts of alumina.
The grain diameter of the mullite is 500 meshes;
the grain diameter of the silicon carbide is 500 meshes;
the particle size of the ceramic particles is 150 meshes;
the preparation method of the high-temperature corrosion resistant sagger in the embodiment comprises the following steps:
(1) melting silicon dioxide; adding mullite, silicon carbide, nano titanium and ceramic particles in parts by weight under the protection of nitrogen, and fully mixing zirconia, silicon boride and alumina to obtain high-temperature slurry;
(2) and pouring the high-temperature slurry into a sagger mold for molding, sintering the molded green body in a sintering furnace at the temperature of 1350-1400 ℃ in a nitrogen environment to obtain the sagger, and cooling to room temperature.
Example 5
The high-temperature corrosion resistant sagger comprises the following components in parts by weight: 10 parts of mullite, 45 parts of silicon carbide, 28 parts of nano silicon dioxide, 2.5 parts of nano titanium, 6 parts of ceramic particles, 2 parts of zirconia, 3.5 parts of silicon boride and 2 parts of alumina.
The grain diameter of the mullite is 500 meshes;
the grain diameter of the silicon carbide is 500 meshes;
the particle size of the ceramic particles is 150 meshes;
the preparation method of the high-temperature corrosion resistant sagger in the embodiment comprises the following steps:
(1) melting silicon dioxide; adding mullite, silicon carbide, nano titanium and ceramic particles in parts by weight under the protection of nitrogen, and fully mixing zirconia, silicon boride and alumina to obtain high-temperature slurry;
(2) and pouring the high-temperature slurry into a sagger mold for molding, sintering the molded green body in a sintering furnace at the temperature of 1400-1450 ℃ in a nitrogen environment to obtain the sagger, and cooling to room temperature.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (8)
1. A high temperature corrosion resistant sagger is characterized in that: the paint comprises the following components in parts by weight: 5-10 parts of mullite, 30-50 parts of silicon carbide, 30-40 parts of silicon dioxide, 1-5 parts of nano titanium, 5-10 parts of ceramic particles, 1-5 parts of zirconium oxide, 3-5 parts of silicon boride and 1-5 parts of aluminum oxide.
2. The high temperature corrosion resistant sagger of claim 1, wherein: the paint comprises the following components in parts by weight: 8-10 parts of mullite, 40-50 parts of silicon carbide, 25-30 parts of silicon dioxide, 2-3 parts of nano titanium, 5-8 parts of ceramic particles, 1-3 parts of zirconium oxide, 3-4 parts of silicon boride and 2-3 parts of aluminum oxide.
3. The high temperature corrosion resistant sagger of claim 1, wherein: the paint comprises the following components in parts by weight: 10 parts of mullite, 45 parts of silicon carbide, 28 parts of silicon dioxide, 2.5 parts of nano titanium, 6 parts of ceramic particles, 2 parts of zirconia, 3.5 parts of silicon boride and 2 parts of alumina.
4. The high temperature corrosion resistant sagger of any one of claims 1-3, wherein: the grain diameter of the mullite is 400-500 meshes.
5. The high temperature corrosion resistant sagger of any one of claims 1-3, wherein: the grain diameter of the silicon carbide is 400-500 meshes.
6. The high temperature corrosion resistant sagger of any one of claims 1-3, wherein: the particle size of the ceramic particles is 150-180 meshes.
7. A method for preparing the high temperature corrosion resistant sagger according to claim 1, wherein: the method comprises the following steps:
(1) melting silicon dioxide; adding mullite, silicon carbide, nano titanium and ceramic particles in parts by weight under the protection of nitrogen, and fully mixing zirconia, silicon boride and alumina to obtain high-temperature slurry;
(2) and pouring the high-temperature slurry into a sagger mold for molding, firing the molded green blank in a sintering furnace under the protection of nitrogen to obtain the sagger, and cooling to room temperature.
8. The method of making a high temperature corrosion resistant sagger as claimed in claim 7, wherein: the sintering temperature is 1350-.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111848199A (en) * | 2020-08-11 | 2020-10-30 | 长兴鑫原耐火材料科技有限公司 | High-thermal-shock long-service-life sagger and preparation method thereof |
| CN112456982A (en) * | 2020-12-16 | 2021-03-09 | 刘永杰 | Formula and method for preparing sagger for lithium battery positive electrode material |
| CN112897995A (en) * | 2020-11-21 | 2021-06-04 | 江阴誉球耐火材料有限公司 | Anhydrous fire-resistant stemming and preparation method thereof |
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| CN101486586A (en) * | 2009-02-26 | 2009-07-22 | 冯维银 | Formula for manufacturing lithium battery material calcination sagger |
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| 杜景红等著: "《无机非金属材料学》", 31 August 2016, 北京：冶金工业出版社 * |
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| CN111848199A (en) * | 2020-08-11 | 2020-10-30 | 长兴鑫原耐火材料科技有限公司 | High-thermal-shock long-service-life sagger and preparation method thereof |
| CN112897995A (en) * | 2020-11-21 | 2021-06-04 | 江阴誉球耐火材料有限公司 | Anhydrous fire-resistant stemming and preparation method thereof |
| CN112456982A (en) * | 2020-12-16 | 2021-03-09 | 刘永杰 | Formula and method for preparing sagger for lithium battery positive electrode material |
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