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A kind of lightweight corundum-silicon carbide refractory material and preparation method thereof

A technology of refractory materials and silicon carbide, which is applied in the field of lightweight corundum-silicon carbide refractory materials and its preparation, can solve the problems of thermal shock stability, slag resistance and oxidation resistance of products, and low bond strength of aggregate/matrix interface , Low product strength and other issues, to achieve the effect of improving interface compatibility, reducing heat loss, improving strength and thermal shock stability

Active Publication Date: 2022-07-05
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are still some deficiencies in the existing corundum-silicon carbide refractory materials: (1) the products are made of dense aggregates such as corundum and brown corundum, which have high density, the thermal conductivity of the products is too high, the heat loss is fast, and energy is wasted; (2) the products are dense The surface of corundum aggregate is relatively smooth, and the interface compatibility with the matrix, especially the non-oxide in the matrix, leads to low bonding strength of the aggregate / matrix interface, which not only has low strength of the product, but also limits the thermal shock stability of the product , anti-slag performance and anti-oxidation performance; (3) It is difficult for silicon carbide particles in the product to form neck connections with corundum aggregate and oxide fine powder in the matrix, and the product strength is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0046] The preparation method of the modified solution is as follows: according to the mass ratio of deionized water:catalyst of 100:2.6-4.1, the deionized water and the catalyst are mixed and stirred evenly to obtain a modified solution.

[0047] Step 1.5, crushing and sieving the modified porous corundum ceramic material to obtain modified porous corundum ceramic particles I, modified porous corundum ceramic particles II and modified porous corundum ceramic fine powder, respectively.

[0048] The particle size of the modified porous corundum ceramic particles I is less than 3.2 mm and greater than or equal to 1.3 mm, and the particle size of the modified porous corundum ceramic particles II is less than 1.3 mm and greater than or equal to 0.6 mm. The particle size of the powder is less than 0.088mm.

[0049] Step 2. Preparation of Lightweight Corundum-Silicon Carbide Refractory

[0050] Using 25-32wt% modified porous corundum ceramic particles I and 23-30wt% modified porous...

Embodiment 1

[0066] A lightweight corundum-silicon carbide refractory material and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0067] Step 1. Preparation of modified porous corundum ceramic particles and modified porous corundum ceramic fine powder

[0068] Step 1.1. Place the aluminum hydroxide fine powder in a high-temperature furnace, raise the temperature to 340°C at a rate of 3°C / min, keep the temperature for 4.5 hours, and naturally cool to obtain alumina powder with high porosity.

[0069] Step 1.2. According to the mass ratio of the alumina powder with high porosity: light-burned magnesite powder: water to 100: 1.7: 2, the alumina powder with high porosity and the light-burned magnesite The magnesium ore fine powder was placed in a mixer, the water was added and mixed, and stirred for 15 min to obtain a mixture.

[0070] Step 1.3, press the mixture under the condition of 200MPa, and then dry the formed body at 140...

Embodiment 2

[0088] A lightweight corundum-silicon carbide refractory material and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0089] Step 1. Preparation of modified porous corundum ceramic particles and modified porous corundum ceramic fine powder

[0090] Step 1.1. Place the aluminum hydroxide fine powder in a high-temperature furnace, heat up to 310°C at a rate of 1°C / min, keep the temperature for 4 hours, and cool naturally to obtain alumina powder with high porosity.

[0091] Step 1.2. According to the mass ratio of the alumina powder with high porosity: light-burned magnesite powder: water to 100:1.6:3.5, combine the alumina powder with high porosity and the light-burned magnesite The magnesium ore fine powder was placed in a mixer, the water was added to mix, and stirred for 18 min to obtain a mixture.

[0092] Step 1.3, press the mixture under the condition of 190MPa, and then dry the formed body at 160°C for 18h;...

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Abstract

The invention relates to a lightweight corundum-silicon carbide refractory material and a preparation method thereof. The technical scheme is as follows: using 25-32wt% of modified porous corundum ceramic particles I and 23-30wt% of modified porous corundum ceramic particles II as aggregates, using 18-28wt% of modified porous corundum ceramic fine powder, 13 ~20wt% of silicon carbide fine powder and 3~5wt% of elemental Si powder are used as the matrix, the aggregate is placed in a mixer first, and 4~7wt% of the total of the aggregate and the matrix is ​​added for modification Liquid thermosetting phenolic resin, mixed, then added to the matrix, stirred, machine-pressed, heat-treated at 200-250°C, then kept at 1190-1420°C and buried in carbon for 4-10 hours, cooled to obtain lightweight corundum ‑Silicon carbide refractory. The product produced by the invention has the characteristics of low thermal conductivity, high strength, good thermal shock stability, excellent slag resistance and good oxidation resistance, and is suitable for thermal equipment in high temperature industries such as iron making, coking and petrochemical industry.

Description

technical field [0001] The invention belongs to the technical field of corundum-silicon carbide refractory materials. In particular, it relates to a lightweight corundum-silicon carbide refractory material and a preparation method thereof. Background technique [0002] Corundum-silicon carbide refractories are widely used in thermal equipment in high-temperature industries such as ironmaking, coking and petrochemical industries, and are important basic materials to ensure the safe and stable operation of high-temperature industries. [0003] At present, there have been some reports on the research on corundum-silicon carbide refractories. For example, the patented technology "A preparation method of Sialon-bonded corundum-silicon carbide composite refractory material" (CN 201610158848.6), with industrial Si 3 N 4 -SiC waste bricks, sintered corundum, etc. are used as raw materials to prepare sialon combined corundum-silicon carbide composite refractories; another example ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/08C04B35/66C04B35/101C04B35/622C04B38/00C04B35/80
CPCC04B38/08C04B35/101C04B35/622C04B38/0054C04B2235/5276C04B2235/5288C04B2235/3826C04B2235/9607C04B2235/9676Y02P40/60
Inventor 鄢文陈哲陈俊峰韩兵强魏耀武李楠
Owner WUHAN UNIV OF SCI & TECH