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Self-bonding silicon carbide refractory material and preparation method thereof

A technology of refractory materials and silicon carbide, which is applied in the field of refractory materials, can solve the problems of high cost, low output, and high requirements for firing equipment, and achieve the effect of simplifying the production process and reducing costs

Pending Publication Date: 2021-02-09
宜兴市丁山耐火器材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The purpose of the invention is to solve the problems of high requirements for firing equipment, low output and high cost of existing high-end silicon carbide products because they need to be fired in a special gas atmosphere

Method used

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  • Self-bonding silicon carbide refractory material and preparation method thereof
  • Self-bonding silicon carbide refractory material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A self-bonding silicon carbide refractory material, prepared from modified resin diluted with absolute ethanol and silicon carbide raw materials, the modified resin is prepared from thermosetting phenolic resin, absolute alcohol and boron carbide, the silicon carbide The raw material is prepared from at least five kinds of silicon carbide particles with different particle sizes, metal silicon powder, graphite powder, silica fume and thermosetting resin powder.

[0031] The modified resin is a mixture obtained by mixing and stirring thermosetting phenolic resin, absolute ethanol and boron carbide according to a weight ratio of 3.5:2:1.

[0032] Dilute the resin with absolute ethanol first, so that we can mix boron carbide evenly into the binder phenolic resin without making the viscosity too high. There are two advantages in doing this:

[0033] One is that boron carbide can be more uniformly wrapped on the particle surface;

[0034] Second, the resin modified by boron ...

Embodiment 2

[0039] A self-bonding silicon carbide refractory material, prepared from modified resin diluted with absolute ethanol and silicon carbide raw materials, the modified resin is prepared from thermosetting phenolic resin, absolute alcohol and boron carbide, the silicon carbide The raw material is prepared from at least five kinds of silicon carbide particles with different particle sizes, metal silicon powder, graphite powder, silica fume and thermosetting resin powder.

[0040] The modified resin is a mixture obtained by mixing and stirring thermosetting phenolic resin, absolute ethanol and boron carbide according to a weight ratio of 3.5:2:1.

[0041] Dilute the resin with absolute ethanol first, so that we can mix boron carbide evenly into the binder phenolic resin without making the viscosity too high. There are two advantages in doing this:

[0042] One is that boron carbide can be more uniformly wrapped on the particle surface;

[0043] Second, the resin modified by boron ...

Embodiment 3

[0048] A method for preparing a self-bonding silicon carbide refractory material, comprising the following steps:

[0049] 1) Weigh the raw materials according to the proportioning requirements of the modified resin and the silicon carbide raw materials respectively;

[0050] 2) Put the thermosetting phenolic resin, absolute ethanol and boron carbide mixed according to the proportion in a high-speed stirrer and stir evenly to form a modified resin;

[0051] 3) Put the powder in the ball mill bucket and mill it evenly, and use the pre-made modified resin as a spare;

[0052] 4) Put the particle mixture of silicon carbide with a particle size of 1-3mm and silicon carbide with a particle size of 0-1mm in the silicon carbide raw material and mix it in a mixer for 3 minutes, and then add it while stirring. modified resin, continue to stir for 3 minutes;

[0053] 5) Pause the stirring, add the silicon carbide raw material and pre-mix the other powders except step 4) and continue t...

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Abstract

The invention relates to a self-bonding silicon carbide refractory material which is prepared from modified resin diluted by absolute ethyl alcohol and a silicon carbide raw material, and the modifiedresin is prepared from thermosetting phenolic resin, absolute ethyl alcohol and boron carbide. The silicon carbide raw material is prepared from at least five silicon carbide particles with differentparticle sizes, metal silicon powder, graphite powder, silica fume and thermosetting resin powder. According to the preparation method disclosed by the invention, when the firing temperature reaches560 DEG C, boron carbide reacts with oxygen to generate liquid-phase boron oxide and carbon dioxide, the liquid-phase boron oxide and carbon dioxide are oxidized earlier than metal silicon, a glass phase is easy to melt out so as to seal pores or overflow out of the surface to form a layer of compact oxide film, and the generated carbon dioxide escapes from the pores, and has a certain guiding andpromoting effect on melting out of the glass phase so that air can be isolated, a reducing atmosphere is formed in a self-bonding silicon carbide product, the metal silicon powder and graphite can react to generate silicon carbide whiskers, and the purpose of sintering is achieved.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a self-bonded silicon carbide refractory material and a preparation method thereof. Background technique [0002] SiC materials are widely used in various fields because of their high temperature strength, good oxidation resistance, wear resistance, good thermal stability, small thermal expansion coefficient, high thermal conductivity, and high hardness. SiC is a material with strong covalent bonds, and its diffusion rate during sintering is quite low. At the same time, the surface of its particles is often covered with a relatively thin oxide layer, which acts as a diffusion barrier. Pure silicon carbide is difficult to sinter without sintering additives. [0003] Today's common silicon carbide products with high silicon carbide content and high strength are mainly divided into Si3N4 bonded SiC, Sialon bonded SiC, Si2N2O bonded SiC and SiC self-bonded S...

Claims

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Application Information

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IPC IPC(8): C04B35/567C04B35/622C04B35/81
CPCC04B35/573C04B35/622C04B35/66C04B2235/428C04B2235/425C04B2235/3418C04B2235/3821C04B2235/5276C04B2235/5427C04B2235/5436C04B2235/656C04B2235/6567C04B2235/96C04B2235/77C04B2235/9607
Inventor 董良军李亚伟桑绍柏程伦陆国峰程茜
Owner 宜兴市丁山耐火器材有限公司
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