Silicon carbide-calcium hexaluminate-aluminum composite refractory material

A technology of calcium hexaaluminate and refractory materials, applied in the field of refractory materials, can solve the problems of destabilizing the matrix structure, low high-temperature mechanical strength, spalling, etc., so as to improve the high-temperature flexural strength, improve the high-temperature mechanical properties, and improve the composition and structure. Effect

Active Publication Date: 2020-09-11
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Claims
  • Application Information

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Problems solved by technology

This silicon carbide-calcium hexaaluminate-aluminum composite refractory material has excellent slag resistance, but poor high-temperature mechanical properties (high-temperature flexural strength is about 2-4MPa, buried carbon for 30min at 1400°C), facing coal-water slurry gas The high temperature and high pressure of the chemical furnace and the continuous erosion of gas, liquid and solid are very prone to material wear and peeling.
The

Method used

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  • Silicon carbide-calcium hexaluminate-aluminum composite refractory material

Examples

Experimental program
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Effect test

Example Embodiment

[0015] Example 1:

[0016] Weigh the particle size range of 10μm~90μm, w (Al 2 O 3 +CaO)=99.0% dense calcium hexaaluminate powder 35kg; 5kg of coated metal aluminum powder with a particle size range of 10μm~45μm and a sphericity of 0.92, put them into a ball mill tank and mix thoroughly with a rolling ball mill for 1.5 hours; Weigh the particle size range of 0.1mm~3mm, w (SiC)=99.0% silicon carbide particles 60kg; put the silicon carbide particles into the wheel-type sand mixer and stir for 5min, add 4.5kg phenolic resin and stir for 3min, combine the pre-mixed dense calcium hexaaluminate powder and the package The coated metal aluminum powder is put into the wheel-type sand mixer and stirred together for 20 minutes. After mixing, the material is trapped for 24 hours. A friction brick press is used to form the fully trapped raw material, and the green body is dried at 180°C for 24 hours in an oven. Put the baked green body into a corundum sagger, fill it with graphite powder, an...

Example Embodiment

[0017] Example 2:

[0018] Weigh the particle size range of 10μm~45μm respectively, w (Al 2 O 3 +CaO)=99.5% dense calcium hexaaluminate powder 30kg; 7kg of coated metal aluminum powder with a particle size range of 10μm~45μm and a sphericity of 0.90, put them into a ball mill tank and mix thoroughly with a rolling ball mill for 1 hour; Weigh the particle size range of 0.1mm~3mm, w (SiC)=98.5% of silicon carbide particles 63kg. Put the silicon carbide particles into the wheel-type sand mixer and stir for 5 minutes, add 5kg of phenolic resin and stir for 3 minutes, put the pre-mixed dense calcium hexaaluminate powder and the coated metal aluminum powder into the wheel-type sand mixer In the medium, stir together for 20 minutes, mix well and wait for 24 hours to trap the material. A friction brick press is used to form the fully trapped raw material, and the green body is dried at 180°C for 24 hours in an oven. Put the baked green body into a corundum sagger, use graphite powder f...

Example Embodiment

[0019] Example 3:

[0020] Weigh the particle size range of 10μm~90μm, w (Al 2 O 3 +CaO)=98.5% dense calcium hexaaluminate powder 22kg; 8kg of coated metal aluminum powder with a particle size range of 10μm~45μm and a sphericity of 0.85, put them into a ball mill tank and mix thoroughly with a rolling ball mill for 1 hour; Weigh the particle size range of 0.1mm~3mm, w (SiC) = 99.0% silicon carbide particles 70kg. Put the silicon carbide particles into the wheel-type sand mixer and stir for 5 minutes, add 4kg of amino water-based resin and stir for 3 minutes, put the pre-mixed dense calcium hexaaluminate powder and the coated metal aluminum powder into the roller-type sand mixer In the machine, stir together for 30 minutes, mix well and wait 12 hours to trap the material. A friction brick press is used to shape the fully trapped raw material, and the green body is dried at 60°C and 110°C for 6 hours in an oven. Put the baked green body into a corundum sagger, fill it with graphi...

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Abstract

The invention belongs to the field of refractory materials, and relates to a silicon carbide-calcium hexaluminate-aluminum composite refractory material. According to the silicon carbide-calcium hexaluminate-aluminum composite refractory material, silicon carbide particles with the adding amount being 60%-75% of the total mass of raw materials serve as aggregate; a matrix is also added into the composite refractory material, wherein the matrix contains compact calcium hexaluminate fine powder or micro powder; and metal aluminum powder subjected to coating treatment is further added into the matrix, the particle size range is 10-45 microns, and the adding amount is 2%-8% of the total mass of the raw materials. By uniformly mixing the aggregate, the matrix and the binding agent, carrying outmechanical pressing molding, drying, and sintering at the highest temperature of 1500-1600 DEG C in a carbon-buried atmosphere, the silicon carbide-calcium hexaluminate-aluminum composite material isobtained. According to the invention, the phase composition of the matrix is improved, the high-temperature mechanical property and the high-temperature breaking strength of the material are improved, and meanwhile, the material has the characteristics of excellent erosion resistance, low price, excellent thermal shock resistance and the like.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a silicon carbide-calcium hexaaluminate-aluminum composite refractory material. Background technique [0002] In the field of contemporary coal gasification, the most widely used gasification technology is coal water slurry gasification technology, which utilizes the combustion of coal water slurry under high temperature and high pressure environment to prepare H 2 , CO, CO 2 Wait for gas. The operating conditions of the coal-water slurry gasification furnace designed based on the coal-water slurry gasification technology are: 1300℃~1500℃ high temperature, 2.0~8.5MPa high pressure and strong reducing atmosphere. During the operation of the gasifier, it is also accompanied by high-speed airflow, Scouring and impact of slag and solid matter on the lining material. The pressure in the furnace and the continuous erosion of gas, liquid and solid substances in the high tempe...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/565
CPCC04B35/565C04B35/66C04B2235/3222C04B2235/402C04B2235/5427C04B2235/5436C04B2235/77C04B2235/96
Inventor 李红霞杜一昊孙红刚司瑶晨赵世贤尚心莲夏淼亢一娜
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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