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Sialon-graphite composite silicon carbide material and preparation method thereof

A technology of compounding silicon carbide and silicon carbide is applied in the field of blast furnace lining refractory materials, which can solve the problems of high requirements for equipment sealing and pressure resistance, relatively high requirements for high temperature resistance, and is not suitable for large-scale production, and achieves easy mass production. , Low production cost, reducing the effect of furnace body joints

Inactive Publication Date: 2013-03-06
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The maximum firing temperature of this patent is 2200°C, which requires relatively high temperature resistance for equipment lining materials, and relatively high energy consumption. The atmosphere contains 5-40vol% carbon monoxide, and the overall pressure is 0.1-5MPa. It has high requirements on the airtightness and pressure resistance of the equipment, and is not suitable for large-scale production in general industrial kilns

Method used

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  • Sialon-graphite composite silicon carbide material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] According to the ratio of mass content 6%, 3%, 6%, 10%, 10%, 45%, 20%, silicon powder, aluminum powder, alumina powder, flake graphite (45 μm) and silicon carbide coarse (1.43~ 2.5mm), medium (0.5-1.43mm), and fine particles (0.1-0.5mm) are weighed for later use. Among them, silicon powder, aluminum powder, and alumina powder are co-ground for 30 minutes to prepare mixed fine powder for later use.

[0023] Mix coarse, medium and fine silicon carbide particles in a kneader for 3 minutes, then add 5% binder phenolic resin and 0.5% solvent absolute ethanol and mix for 2 minutes to make the binder form on the surface of silicon carbide particles To form a uniform film, add graphite and knead for 5 minutes to ensure that the graphite is evenly coated on the surface of the silicon carbide particles, and finally add the pre-prepared mixed fine powder and knead for 10 minutes to prepare a billet. Press the billet into 25×25×125mm with a pressure of 120MPa on a hydraulic press ...

Embodiment 2

[0025] According to the ratio of mass content 8%, 2%, 8%, 8%, 12%, 42%, 20%, silicon powder, aluminum powder, alumina powder, flake graphite (325 μm) and silicon carbide coarse (1.43~ 2.5mm), medium (0.5-1.43mm), and fine particles (0.1-0.5mm) are weighed for later use. Among them, silicon powder, aluminum powder and alumina powder are co-ground for 20 to 30 minutes to prepare mixed fine powder for later use.

[0026] Mix the coarse, medium and fine particles of silicon carbide in a kneader for 3 minutes, then add 4.5% of the total amount of raw materials as a binder phenolic resin and 0.5% solvent ethylene glycol and mix for 2 minutes to make the binder on the surface of the silicon carbide particles Form a uniform film, then add graphite and knead for 6 minutes to ensure that the graphite is evenly coated on the surface of the silicon carbide particles, and finally add the pre-prepared mixed fine powder and knead for 15 minutes to prepare a billet. Press the billet into 230...

Embodiment 3

[0028] According to the ratio of mass content 10%, 1%, 5%, 6%, 15%, 45%, 18%, silicon powder, aluminum powder, alumina powder, flake graphite (75 μm) and silicon carbide coarse (1.43~ 2.5mm), medium (0.5-1.43mm), and fine particles (0.1-0.5mm) are weighed for later use. Among them, silicon powder, aluminum powder and alumina powder are co-ground for 20 to 30 minutes to prepare mixed fine powder for later use.

[0029] Mix the coarse, medium and fine particles of silicon carbide in the kneader for 4 minutes, then add 1% of the binder dextrin, 2% of the water-soluble amino resin and 2% of the solvent water and knead for 2 minutes to make the binder Form a uniform film on the surface of silicon carbide particles, then add graphite and knead for 8 minutes to ensure that the graphite is evenly coated on the surface of silicon carbide particles, and finally add the pre-prepared mixed fine powder and knead for 12 minutes to prepare a billet. Press the billet into 230×150×75mm with a...

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Abstract

The invention relates to a Sialon-graphite composite silicon carbide material and a preparation method thereof, which belong to the technical field of fire-resistant materials. The Sialon-graphite composite silicon carbide material is prepared at a temperature of between 1,450 and 1,550 DEG C, under the 0.1MPa nitrogen atmosphere, and by adopting silica powder, aluminum powder, alumina powder, crystalline flake graphite and coarse, medium and fine particles of silicon carbide as raw materials. The material has good thermal shock resistance, corrosion resistance and oxidation resistance, and can replace an alternative masonry construction formed by beta-SiAlON-Sic and graphite on the middle-upper part of a furnace shaft of a blast furnace. Moreover, because the variety of the material in the construction process is reduced, the workload of furnace body masonry workers is greatly reduced; the work efficiency is improved; and the production cost is reduced. Furthermore, the Sialon-graphite composite silicon carbide material can also reduce furnace body joints generated by alternative masonry, improves the integrity of a furnace body, and improves the service life of the blast furnace.

Description

technical field [0001] The invention relates to a blast furnace lining refractory material, in particular to a sialon-graphite composite silicon carbide material and a preparation method thereof. key refractories. Background technique [0002] With the development of ironmaking technology, large-scale blast furnaces generally adopt new technologies such as fine material, high wind temperature, high-pressure furnace roof, and oxygen-rich large coal injection to strengthen smelting. The operating conditions of blast furnaces are becoming increasingly harsh, and refractory materials with better performance are required to Meet the needs of longevity. Nitride-bonded silicon carbide refractory materials represented by β-SiAlON-SiC are widely used because of their high-temperature strength, good thermal shock resistance, alkali resistance, slag erosion resistance and high-temperature wear resistance. It is widely used in furnace waist, shaft and bosh, etc., and has achieved good...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 王文武曹会彦李付龚剑锋杨洋张新华黄志刚吴吉光
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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