High-strength refractory material and preparation method thereof

Abstract

The invention relates to the field of refractory materials, in particular to a high-strength refractory material and a preparation method thereof, which are used for solving the problem that the existing traditional refractory material is low in strength and difficult to meet the high-standard requirement of modern industry on equipment. The high-strength refractory material comprises the following components: silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, titanium diboride and a phosphorus-containing phenyl multi-epoxy-group binding agent, according to the preparation method, silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide and titanium diboride are taken as main raw materials, the main raw materials are endowed with excellent mechanical properties, and after a phosphorus-containing phenyl polyepoxy binding agent is added, the mechanical properties of the main raw materials can be further remarkably improved, so that the prepared refractory material has the characteristics of high strength, high temperature resistance and the like. The composite material shows high durability and reliability in a high-temperature environment, and is suitable for thermal protection in the high-temperature environment and internal construction of high-temperature equipment.

Description

Technical Field

[0001] This invention relates to the field of refractory materials, specifically to a high-strength refractory material and its preparation method. Background Technology

[0002] In recent years, with the continuous advancement of industrial technology, the demand for refractory materials has also increased. Especially for equipment operating in high-temperature and high-intensity environments, such as steelmaking furnaces and pyrolysis furnaces, materials with excellent strength and refractory properties must be used to ensure the long-term stable operation of the equipment. While traditional refractory materials exhibit excellent refractory properties, their strength is generally low, making it difficult to meet the high standards required by modern industry. Therefore, developing a high-strength refractory material and its preparation method is of great significance.

[0003] To address the aforementioned technical shortcomings, a solution is proposed. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a high-strength refractory material and its preparation method, which solves the problem that existing traditional refractory materials have low strength and cannot meet the high standards of modern industry for equipment.

[0005] The objective of this invention can be achieved through the following technical solutions: In a first aspect, this application provides a high-strength refractory material, comprising the following components in parts by weight: 70-80 parts silicon carbide, 18-24 parts tabular corundum, 20-25 parts silicon powder, 1-2 parts yttrium oxide, 1-2 parts magnesium oxide, 0.4-0.8 parts titanium diboride, and 2-6 parts phosphorus-containing phenyl polyepoxy binder; The phosphorus-containing phenyl polyepoxy binder is prepared by the following steps: Step a1: Add pyromellitic aldehyde, 2-aminophenol and anhydrous ethanol to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection. Stir the reaction at 20-25℃ and 200-300 r / min for 10-20 min. Then raise the temperature to 60-70℃ and continue stirring for 2-3 h. After the reaction is complete, cool the reaction product to room temperature and then remove the solvent by rotary evaporation to obtain a polyhydroxy Schiff base compound. Step a2: Add the polyhydroxy Schiff base compound, DOPO and 1,4-dioxane to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir the reaction at 20-25℃ and 200-300 r / min for 10-20 min. Then raise the temperature to 40-50℃ and continue stirring for 15-20 h. After the reaction is completed, cool the reaction product to room temperature and then remove the solvent by rotary evaporation to obtain the polyhydroxy phosphorus-containing compound. Step a3: Add the polyhydroxy phosphorus-containing compound, epichlorohydrin, and tetramethylammonium bromide to a three-necked flask equipped with a stirrer, thermometer, and gas delivery tube. Purge with nitrogen for protection and stir the reaction at 20-25℃ and 200-300 r / min for 10-20 min. Then raise the temperature to 70-80℃ and continue stirring for 6-8 h. After that, lower the temperature to 50-55℃ and add sodium hydroxide and continue stirring for 3-4 h. After the reaction is complete, cool the reaction product to room temperature, then filter under vacuum. Wash the filtrate 3-5 times with distilled water, then dry with anhydrous magnesium sulfate, then filter under vacuum again. Rotary evaporate the filtrate to remove the solvent, and obtain the phosphorus-containing phenyl polyepoxy binder.

[0006] In a preferred embodiment of the present invention, the ratio of pyromellitic aldehyde, 2-aminophenol and anhydrous ethanol in step a1 is 10 mmol: 30 mmol: 50-60 mL.

[0007] In a preferred embodiment of the present invention, the ratio of the polyhydroxy Schiff base compound, DOPO and 1,4-dioxane in step a2 is 10 mmol: 30 mmol: 60-70 mL.

[0008] In a preferred embodiment of the present invention, the ratio of the polyhydroxy phosphorus-containing compound, epichlorohydrin, tetramethylammonium bromide and sodium hydroxide in step a3 is 10 mmol: 100-200 mmol: 0.05-0.15 g: 50-80 mmol.

[0009] Secondly, this application provides a method for preparing a high-strength refractory material, comprising the following steps: Step 1: Weigh out 70-80 parts by weight of silicon carbide, 18-24 parts by weight of tabular corundum, 20-25 parts by weight of silicon powder, 1-2 parts by weight of yttrium oxide, 1-2 parts by weight of magnesium oxide, 0.4-0.8 parts by weight of titanium diboride, and 2-6 parts by weight of phosphorus-containing phenyl polyepoxy binder, and set aside. Step 2: Add silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, titanium diboride, and phosphorus-containing phenyl polyepoxy binder into a mixer and mix for 30-50 minutes at a temperature of 40-60℃ and a stirring speed of 300-600 r / min to obtain a mixture. Step 3: Add the mixture into the mold and press it into shape under a pressure of 150-200MPa. Then place it in a vacuum drying oven and dry it at a temperature of 100-110℃ for 10-15 hours. After that, place it in a tube furnace, purge it with nitrogen for protection, and calcine it at a temperature of 1200-1400℃ for 2-3 hours. Then cool it with the furnace to obtain a high-strength refractory material.

[0010] In a preferred embodiment of the present invention, the average particle size of the silicon carbide is 0.3 mm.

[0011] In a preferred embodiment of the present invention, the average particle size of the tabular corundum is 100 μm.

[0012] In a preferred embodiment of the present invention, the average particle size of the silicon powder is 1 μm.

[0013] In a preferred embodiment of the present invention, the average particle size of the yttrium oxide is 1 μm.

[0014] In a preferred embodiment of the present invention, the average particle size of the magnesium oxide is 5 μm.

[0015] In a preferred embodiment of the present invention, the titanium diboride has an average particle size of 10 μm.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention discloses a high-strength refractory material and its preparation method. The method involves mixing silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, titanium diboride, and a phosphorus-containing phenyl polyepoxy binder to obtain a mixture. This mixture is then pressed into a mold, dried, calcined, and subsequently cooled in a furnace to obtain the high-strength refractory material. This preparation method uses silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, and titanium diboride as main raw materials, imparting excellent mechanical properties. The addition of a phosphorus-containing phenyl polyepoxy binder further significantly enhances these mechanical properties, resulting in a refractory material with high strength, high durability and reliability in high-temperature environments, suitable for thermal protection in high-temperature environments and the internal construction of high-temperature equipment.

[0017] In the preparation of high-strength refractory materials, a phosphorus-containing phenyl polyepoxy binder was first prepared. This was achieved through a reaction between trimesin and 2-aminophenol, where the aldehyde group on trimesin reacts with the amino group on 2-aminophenol to form a Schiff base structure, yielding a polyhydroxy Schiff base compound. Then, a reaction between this polyhydroxy Schiff base compound and DOPO was conducted, where the Schiff base structure of the polyhydroxy Schiff base compound reacts with the pH group on DOPO, thereby introducing DOPO and yielding a polyhydroxy phosphorus-containing compound. Finally, a reaction between this polyhydroxy phosphorus-containing compound and epichlorohydrin was conducted, where the hydroxyl groups on the polyhydroxy phosphorus-containing compound undergo a ring-opening-ring-closing reaction with the epoxy groups on epichlorohydrin, thus introducing multiple epoxy groups. A phosphorus-containing phenyl polyepoxy binder was obtained. This phosphorus-containing phenyl polyepoxy binder contains multiple epoxy groups, which can tightly bind loose raw materials, easily achieve compression molding, and the molded green body is not easy to crack or collapse. It fills the volume shrinkage gap of refractory materials at high temperatures, reduces structural looseness, and can also slowly carbonize in high-temperature environments to form a continuous carbon network structure, thereby improving its high-temperature volume stability and mechanical strength. Moreover, by introducing phosphorus and nitrogen elements, and then introducing flame-retardant groups, the high-temperature residual carbon rate is greatly improved, while enhancing the resistance to thermal oxidation, reducing carbon loss at high temperatures, improving the stability of the carbon network structure, and further improving the high-temperature volume stability and mechanical strength of refractory materials. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: This embodiment describes a method for preparing a high-strength refractory material, including the following steps: Step S1: 10 mmol of pyromellitic aldehyde, 30 mmol of 2-aminophenol and 50 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 20 °C and 200 r / min for 10 min. Then the temperature was raised to 60 °C and the mixture was stirred for 2 h. After the reaction was completed, the reaction product was cooled to room temperature and the solvent was removed by rotary evaporation to obtain a polyhydroxy Schiff base compound. Step S2: 10 mmol of polyhydroxy Schiff base compound, 30 mmol of DOPO and 60 mL of 1,4-dioxane were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 20 °C and 200 r / min for 10 min. Then the temperature was raised to 40 °C and the mixture was stirred for 15 h. After the reaction was completed, the reaction product was cooled to room temperature and the solvent was removed by rotary evaporation to obtain the polyhydroxy phosphorus-containing compound. Step S3: 10 mmol of polyhydroxy phosphorus-containing compound, 100 mmol of epichlorohydrin and 0.05 g of tetramethylammonium bromide were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 20 °C and 200 r / min for 10 min. Then the temperature was raised to 70 °C and the mixture was stirred for 6 h. The temperature was then lowered to 50 °C and 50 mmol of sodium hydroxide was added and the mixture was stirred for 3 h. After the reaction was completed, the reaction product was cooled to room temperature and then vacuum filtered. The filtrate was washed three times with distilled water and dried with anhydrous magnesium sulfate. The filtrate was then vacuum filtered and the solvent was removed by rotary evaporation to obtain a phosphorus-containing phenyl polyepoxy binder. Step S4: Weigh out 70 parts by weight of silicon carbide, 18 parts by weight of tabular corundum, 20 parts by weight of silicon powder, 1 part by weight of yttrium oxide, 1 part by weight of magnesium oxide, 0.4 parts by weight of titanium diboride, and 2 parts by weight of phosphorus-containing phenyl polyepoxy binder, and set aside. The average particle size of the silicon carbide is 0.3 mm; the average particle size of the tabular corundum is 100 μm; the average particle size of the silicon powder is 1 μm; the average particle size of the yttrium oxide is 1 μm; the average particle size of the magnesium oxide is 5 μm; and the average particle size of the titanium diboride is 10 μm. Step S5: Add silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, titanium diboride and phosphorus-containing phenyl polyepoxy binder into a mixer, and stir and mix for 30 minutes at a temperature of 40℃ and a stirring speed of 300r / min to obtain a mixture. Step S6: Add the mixture into the mold and press it into shape under a pressure of 150 MPa. Then place it in a vacuum drying oven and dry it at a temperature of 100°C for 10 hours. After that, place it in a tube furnace, introduce nitrogen for protection, and calcine it at a temperature of 1200°C for 2 hours. Then cool it with the furnace to obtain a high-strength refractory material.

[0020] Example 2: This embodiment describes a method for preparing a high-strength refractory material, including the following steps: Step S1: 10 mmol of pyromellitic aldehyde, 30 mmol of 2-aminophenol and 55 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 22 °C and 250 r / min for 15 min. Then the temperature was raised to 65 °C and the mixture was stirred for 2.5 h. After the reaction was completed, the reaction product was cooled to room temperature and the solvent was removed by rotary evaporation to obtain a polyhydroxy Schiff base compound. Step S2: 10 mmol of polyhydroxy Schiff base compound, 30 mmol of DOPO and 65 mL of 1,4-dioxane were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 22 °C and 250 r / min for 15 min. Then the temperature was raised to 45 °C and the mixture was stirred for 18 h. After the reaction was completed, the reaction product was cooled to room temperature and the solvent was removed by rotary evaporation to obtain the polyhydroxy phosphorus-containing compound. Step S3: 10 mmol of polyhydroxy phosphorus-containing compound, 150 mmol of epichlorohydrin and 0.1 g of tetramethylammonium bromide were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 22 °C and 250 r / min for 15 min. The temperature was then raised to 75 °C and the mixture was stirred for 7 h. The temperature was then lowered to 52 °C and 65 mmol of sodium hydroxide was added and the mixture was stirred for 3.5 h. After the reaction was completed, the reaction product was cooled to room temperature and then vacuum filtered. The filtrate was washed four times with distilled water and dried with anhydrous magnesium sulfate. The filtrate was then vacuum filtered and the solvent was removed by rotary evaporation to obtain a phosphorus-containing phenyl polyepoxy binder. Step S4: Weigh out 75 parts by weight of silicon carbide, 21 parts by weight of tabular corundum, 22 parts by weight of silicon powder, 1.5 parts by weight of yttrium oxide, 1.5 parts by weight of magnesium oxide, 0.6 parts by weight of titanium diboride, and 4 parts by weight of phosphorus-containing phenyl polyepoxy binder, and set aside. The average particle size of the silicon carbide is 0.3 mm; the average particle size of the tabular corundum is 100 μm; the average particle size of the silicon powder is 1 μm; the average particle size of the yttrium oxide is 1 μm; the average particle size of the magnesium oxide is 5 μm; and the average particle size of the titanium diboride is 10 μm. Step S5: Add silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, titanium diboride and phosphorus-containing phenyl polyepoxy binder into a mixer, and stir and mix for 40 minutes at a temperature of 50℃ and a stirring speed of 450r / min to obtain a mixture. Step S6: Add the mixture into the mold and press it into shape under a pressure of 180MPa. Then place it in a vacuum drying oven and dry it at a temperature of 105℃ for 12h. After that, place it in a tube furnace, purge it with nitrogen for protection, and calcine it at a temperature of 1300℃ for 2.5h. Then cool it with the furnace to obtain a high-strength refractory material.

[0021] Example 3: This embodiment describes a method for preparing a high-strength refractory material, including the following steps: Step S1: 10 mmol of pyromellitic aldehyde, 30 mmol of 2-aminophenol and 60 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 25 °C and 300 r / min for 20 min. Then the temperature was raised to 70 °C and the mixture was stirred for 3 h. After the reaction was completed, the reaction product was cooled to room temperature and the solvent was removed by rotary evaporation to obtain a polyhydroxy Schiff base compound. Step S2: 10 mmol of polyhydroxy Schiff base compound, 30 mmol of DOPO and 70 mL of 1,4-dioxane were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 25 °C and 300 r / min for 20 min. Then the temperature was raised to 50 °C and the mixture was stirred for 20 h. After the reaction was completed, the reaction product was cooled to room temperature and the solvent was removed by rotary evaporation to obtain the polyhydroxy phosphorus-containing compound. Step S3: 10 mmol of polyhydroxy phosphorus-containing compound, 200 mmol of epichlorohydrin and 0.15 g of tetramethylammonium bromide were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 25 °C and 300 r / min for 20 min. Then the temperature was raised to 80 °C and the mixture was stirred for 8 h. After that, the temperature was lowered to 55 °C and 80 mmol of sodium hydroxide was added and the mixture was stirred for 4 h. After the reaction was completed, the reaction product was cooled to room temperature and then vacuum filtered. The filtrate was washed 5 times with distilled water and then dried with anhydrous magnesium sulfate. After vacuum filtration, the solvent was removed by rotary evaporation of the filtrate to obtain a phosphorus-containing phenyl polyepoxy binder. Step S4: Weigh out 80 parts by weight of silicon carbide, 24 parts by weight of tabular corundum, 25 parts by weight of silicon powder, 2 parts by weight of yttrium oxide, 2 parts by weight of magnesium oxide, 0.8 parts by weight of titanium diboride, and 6 parts by weight of phosphorus-containing phenyl polyepoxy binder, and set aside. The average particle size of the silicon carbide is 0.3 mm; the average particle size of the tabular corundum is 100 μm; the average particle size of the silicon powder is 1 μm; the average particle size of the yttrium oxide is 1 μm; the average particle size of the magnesium oxide is 5 μm; and the average particle size of the titanium diboride is 10 μm. Step S5: Add silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, titanium diboride and phosphorus-containing phenyl polyepoxy binder into a mixer, and stir and mix for 50 minutes at a temperature of 60℃ and a stirring speed of 600r / min to obtain a mixture. Step S6: Add the mixture into the mold and press it into shape under a pressure of 200MPa. Then place it in a vacuum drying oven and dry it at a temperature of 110℃ for 15h. After that, place it in a tube furnace, introduce nitrogen for protection, and calcine it at a temperature of 1400℃ for 3h. Then cool it with the furnace to obtain a high-strength refractory material.

[0022] Comparative Example 1: This comparative example illustrates a method for preparing a high-strength refractory material, comprising the following steps: Step S1: Weigh out 80 parts by weight of silicon carbide, 24 parts by weight of tabular corundum, 25 parts by weight of silicon powder, 2 parts by weight of yttrium oxide, 2 parts by weight of magnesium oxide, and 0.8 parts by weight of titanium diboride, and set aside. The average particle size of the silicon carbide is 0.3 mm; the average particle size of the tabular corundum is 100 μm; the average particle size of the silicon powder is 1 μm; the average particle size of the yttrium oxide is 1 μm; the average particle size of the magnesium oxide is 5 μm; and the average particle size of the titanium diboride is 10 μm. Step S2: Add silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide and titanium diboride into a mixer, and mix for 50 minutes at a temperature of 60℃ and a stirring speed of 600r / min to obtain a mixture; Step S3: Add the mixture into the mold and press it into shape under a pressure of 200MPa. Then place it in a vacuum drying oven and dry it at a temperature of 110℃ for 15h. After that, place it in a tube furnace, introduce nitrogen for protection, and calcine it at a temperature of 1400℃ for 3h. Then cool it with the furnace to obtain a high-strength refractory material.

[0023] Comparative Example 2: This comparative example illustrates a method for preparing a high-strength refractory material, comprising the following steps: Step S1: Weigh out 80 parts by weight of silicon carbide, 24 parts by weight of tabular corundum, 25 parts by weight of silicon powder, 2 parts by weight of yttrium oxide, 2 parts by weight of magnesium oxide, 0.8 parts by weight of titanium diboride, and 6 parts by weight of epoxy resin E-44, and set aside. The average particle size of the silicon carbide is 0.3 mm; the average particle size of the tabular corundum is 100 μm; the average particle size of the silicon powder is 1 μm; the average particle size of the yttrium oxide is 1 μm; the average particle size of the magnesium oxide is 5 μm; and the average particle size of the titanium diboride is 10 μm. Step S2: Add silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, titanium diboride and epoxy resin E-44 into a mixer and mix for 50 minutes at a temperature of 60℃ and a stirring speed of 600r / min to obtain a mixture. Step S3: Add the mixture into the mold and press it into shape under a pressure of 200MPa. Then place it in a vacuum drying oven and dry it at a temperature of 110℃ for 15h. After that, place it in a tube furnace, introduce nitrogen for protection, and calcine it at a temperature of 1400℃ for 3h. Then cool it with the furnace to obtain a high-strength refractory material.

[0024] Comparative Example 3: This comparative example illustrates a method for preparing a high-strength refractory material, comprising the following steps: Step S1: 10 mmol of pyromellitic aldehyde, 30 mmol of 2-aminophenol and 60 mL of anhydrous ethanol were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 25 °C and 300 r / min for 20 min. Then the temperature was raised to 70 °C and the mixture was stirred for 3 h. After the reaction was completed, the reaction product was cooled to room temperature and the solvent was removed by rotary evaporation to obtain a polyhydroxy Schiff base compound. Step S2: 10 mmol of polyhydroxy Schiff base compound, 200 mmol of epichlorohydrin and 0.15 g of tetramethylammonium bromide were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 25 °C and 300 r / min for 20 min. Then the temperature was raised to 80 °C and the mixture was stirred for 8 h. The temperature was then lowered to 55 °C and 80 mmol of sodium hydroxide was added and the mixture was stirred for 4 h. After the reaction was completed, the reaction product was cooled to room temperature and then vacuum filtered. The filtrate was washed 5 times with distilled water and then dried with anhydrous magnesium sulfate. The filtrate was then vacuum filtered and the solvent was removed by rotary evaporation to obtain the polyepoxy group binder. Step S3: Weigh out 80 parts by weight of silicon carbide, 24 parts by weight of tabular corundum, 25 parts by weight of silicon powder, 2 parts by weight of yttrium oxide, 2 parts by weight of magnesium oxide, 0.8 parts by weight of titanium diboride, and 6 parts by weight of polyepoxy binder, and set aside. The average particle size of the silicon carbide is 0.3 mm; the average particle size of the tabular corundum is 100 μm; the average particle size of the silicon powder is 1 μm; the average particle size of the yttrium oxide is 1 μm; the average particle size of the magnesium oxide is 5 μm; and the average particle size of the titanium diboride is 10 μm. Step S4: Add silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, titanium diboride and polyepoxy binder into a mixer, and mix for 50 minutes at a temperature of 60°C and a stirring speed of 600 r / min to obtain a mixture. Step S5: Add the mixture into the mold and press it into shape under a pressure of 200MPa. Then place it in a vacuum drying oven and dry it at a temperature of 110℃ for 15 hours. After that, place it in a tube furnace, purge it with nitrogen and calcine it at a temperature of 1400℃ for 3 hours. Then cool it with the furnace to obtain a high-strength refractory material.

[0025] Performance testing The high-strength refractory materials of Examples 1-3 and Comparative Examples 1-3 were tested, and the test results are shown in the table below: Referring to the data in the table above, and based on the comparison between Examples 1-3 and Comparative Examples 1-3, it can be seen that the high-strength refractory material of this application has excellent mechanical strength.

[0026] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in this application, they should all fall within the protection scope of the present invention.

Claims

1. A high-strength refractory material, characterized in that, Includes the following components by weight: 70-80 parts silicon carbide, 18-24 parts tabular corundum, 20-25 parts silicon powder, 1-2 parts yttrium oxide, 1-2 parts magnesium oxide, 0.4-0.8 parts titanium diboride, and 2-6 parts phosphorus-containing phenyl polyepoxy binder; The phosphorus-containing phenyl polyepoxy binder is prepared by the following steps: Step a1: Trimethylbenzaldehyde, 2-aminophenol and anhydrous ethanol were stirred and reacted. After the reaction was completed, the reaction product was cooled and then evaporated by rotary evaporation to obtain a polyhydroxy Schiff base compound. Step a2: The polyhydroxy Schiff base compound, DOPO and 1,4-dioxane were stirred and reacted. After the reaction was completed, the reaction product was cooled and then rotary evaporated to obtain the polyhydroxy phosphorus-containing compound. Step a3: The polyhydroxy phosphorus-containing compound, epichlorohydrin and tetramethylammonium bromide are stirred and reacted. Then sodium hydroxide is added and the reaction is continued. After the reaction is completed, the reaction product is cooled and then vacuum filtered. The filtrate is washed, dried and then vacuum filtered again. The filtrate is then rotary evaporated to obtain the phosphorus-containing phenyl polyepoxy binder.

2. The high-strength refractory material according to claim 1, characterized in that, The ratio of pyromellitic aldehyde, 2-aminophenol, and anhydrous ethanol used in step a1 is 10 mmol: 30 mmol: 50-60 mL.

3. The high-strength refractory material according to claim 1, characterized in that, The ratio of the polyhydroxy Schiff base compound, DOPO, and 1,4-dioxane in step a2 is 10 mmol: 30 mmol: 60-70 mL.

4. The high-strength refractory material according to claim 1, characterized in that, The ratio of the polyhydroxy phosphorus-containing compound, epichlorohydrin, tetramethylammonium bromide, and sodium hydroxide used in step a3 is 10 mmol: 100-200 mmol: 0.05-0.15 g: 50-80 mmol.

5. A method for preparing a high-strength refractory material as described in any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Weigh out 70-80 parts by weight of silicon carbide, 18-24 parts by weight of tabular corundum, 20-25 parts by weight of silicon powder, 1-2 parts by weight of yttrium oxide, 1-2 parts by weight of magnesium oxide, 0.4-0.8 parts by weight of titanium diboride, and 2-6 parts by weight of phosphorus-containing phenyl polyepoxy binder, and set aside. Step 2: Add silicon carbide, tabular corundum, silicon powder, yttrium oxide, magnesium oxide, titanium diboride, and phosphorus-containing phenyl polyepoxy binder into a mixer and mix for 30-50 minutes at a temperature of 40-60℃ and a stirring speed of 300-600 r / min to obtain a mixture. Step 3: Add the mixture into the mold and press it into shape under a pressure of 150-200MPa. Then place it in a vacuum drying oven and dry it at a temperature of 100-110℃ for 10-15 hours. After that, place it in a tube furnace, purge it with nitrogen for protection, and calcine it at a temperature of 1200-1400℃ for 2-3 hours. Then cool it with the furnace to obtain a high-strength refractory material.

6. The method for preparing a high-strength refractory material according to claim 5, characterized in that, The average particle size of the silicon carbide is 0.3 mm; the average particle size of the tabular corundum is 100 μm.

7. The method for preparing a high-strength refractory material according to claim 5, characterized in that, The average particle size of the silicon powder is 1 μm.

8. The method for preparing a high-strength refractory material according to claim 5, characterized in that, The average particle size of the yttrium oxide is 1 μm.

9. The method for preparing a high-strength refractory material according to claim 5, characterized in that, The average particle size of the magnesium oxide is 5 μm.

10. The method for preparing a high-strength refractory material according to claim 5, characterized in that, The titanium diboride has an average particle size of 10 μm.

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