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Method for preparation of high performance magnesia carbon brick by adding silicon carbide whisker

A technology of silicon carbide whiskers and magnesia-carbon bricks, which is applied in the field of preparing high-performance magnesia-carbon bricks by adding silicon carbide whiskers. Compressive strength and oxidation resistance, the process is simple and easy, and is conducive to the effect of mass production

Inactive Publication Date: 2018-08-24
苏州佳耐材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional magnesia-carbon bricks have high carbon content and are easy to oxidize, resulting in loose material structure and rapid attenuation of high-temperature strength, thereby reducing the service life of magnesia-carbon bricks.

Method used

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  • Method for preparation of high performance magnesia carbon brick by adding silicon carbide whisker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing high-performance magnesia-carbon bricks by adding silicon carbide whiskers, the steps are as follows:

[0036] Step 1: Raw material pretreatment

[0037] The purchased fused magnesia is crushed and screened.

[0038] Step 2: Preparation of magnesia carbon bricks improved by silicon carbide whiskers

[0039] (1) According to a certain ratio, mix fused magnesia with different particle sizes evenly, and then mix with graphite, additives, silicon carbide whiskers, liquid phenolic resin, according to 80%: 15%: 5%: 0%: 3 % (external) mix evenly;

[0040] (2) The mixed powder is repeatedly pressed and formed into a magnesia-carbon brick sample of 160mm × 25mm × 25mm;

[0041] (3) Place the magnesia-carbon brick sample naturally in the air for 5-10 hours;

[0042] (4) Place the dried magnesia-carbon bricks in a heat treatment kiln at 150-200°C for more than 10 hours.

[0043] Step 3: Performance testing of magnesia carbon bricks

[0044] (1) Measure...

Embodiment 2

[0048] A method of adding silicon carbide whiskers to prepare high-performance magnesia-carbon bricks is the same as in Example 1, except that in step 2 (1), 2% silicon carbide whiskers are added: fused magnesia, graphite, additives, Silicon carbide whiskers and liquid phenolic resin are mixed evenly according to the ratio of 78%: 15%: 5%: 2%: 3% (external).

[0049] After testing, the bulk density of the obtained magnesia carbon brick is 3.08g / cm3, the apparent porosity is 5.2%, the compressive strength at room temperature is 60MPa, the thickness of the oxide layer is 15mm, and the area of ​​the oxide layer is 900mm 3 .

Embodiment 3

[0051] A method for preparing high-performance magnesia-carbon bricks by adding silicon carbide whiskers, the same as Example 1, the difference is that: in step 2 (1), add 4% silicon carbide whiskers: fused magnesia, graphite, additives , silicon carbide whiskers, and liquid phenolic resin are mixed evenly according to the ratio of 76%: 15%: 5%: 4%: 3% (external).

[0052] After testing, the bulk density of the obtained magnesia carbon brick is 2.98g / cm3, the apparent porosity is 5.4%, the compressive strength at room temperature is 64Mpa, the thickness of the oxide layer is 9mm, and the area of ​​the oxide layer is 300mm 3 .

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Abstract

Belonging to the technical field of preparation of refractory materials for iron and steel metallurgy, the invention relates to a method for preparation of a high performance magnesia carbon brick byadding silicon carbide whisker. The specific preparation method includes: first, subjecting fused magnesia to screening treatment; then fully mixing the fused magnesia, graphite, phenolic resin, an additive and silicon carbide whisker of different granularities according to certain ratio, and conducting molding, standing and high temperature heat treatment to obtain a silicon carbide whisker improved magnesia carbon brick; and finally, detecting the compressive strength and oxidation resistance of the magnesia carbon brick. The method provided by the invention enhances the compressive strengthand oxidation resistance of the magnesia carbon brick, and reaches the quality requirements of steelmaking and continuous casting process for relevant refractory material components. The method has the advantages of simple and feasible process, cheap and easily available raw materials, and is easy to achieve mass production.

Description

technical field [0001] The invention belongs to the technical field of preparing refractory materials for iron and steel metallurgy, and relates to a method for preparing high-performance magnesia-carbon bricks by adding silicon carbide whiskers. Background technique [0002] Magnesia carbon bricks are widely used as lining materials in various steelmaking furnaces because of their good thermal shock resistance and corrosion resistance. However, traditional magnesia-carbon bricks have high carbon content and are easy to oxidize, resulting in loose material structure and rapid attenuation of high-temperature strength, thereby reducing the service life of magnesia-carbon bricks. Therefore, it is particularly important to improve the compressive strength and oxidation resistance of magnesia carbon bricks in the steelmaking and continuous casting process. [0003] At present, fiber composite is an effective way to improve the performance of refractory materials. Silicon carbid...

Claims

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Application Information

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IPC IPC(8): C04B35/81C04B35/043C04B35/622
CPCC04B35/043C04B35/622C04B35/803C04B2235/3217C04B2235/3224C04B2235/402C04B2235/425C04B2235/5276C04B2235/77C04B2235/96
Inventor 马北越张亚然苏畅任鑫明于敬雨石明东
Owner 苏州佳耐材料科技有限公司