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Low-carbon magnesium-carbon refractory material added with silicon magnesium nitride powder and preparation method thereof

A technology of carbon-magnesium-carbon refractories and silicon-magnesium nitride, which is applied in the field of low-carbon magnesium-carbon refractories, can solve the problems of unfavorable industrial production, increased production costs, and high addition of antioxidants.

Active Publication Date: 2021-07-06
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the addition of antioxidant is relatively high, which increases the production cost and is unfavorable for industrialized production.

Method used

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  • Low-carbon magnesium-carbon refractory material added with silicon magnesium nitride powder and preparation method thereof

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Effect test

Embodiment 1

[0048] A low-carbon magnesium-carbon refractory material added with magnesium silicon nitride powder and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0049] Step 1. Use 40-43wt% fused magnesia particles, 42-45wt% fused magnesia fine powder, 7-8wt% flake graphite, 5.5-6wt% phenolic resin and 2-3wt% nitriding Magnesium silicon powder is used as raw material and ingredients.

[0050] Step 2. Add the magnesium silicon nitride powder into the phenolic resin in 3 to 5 times at 40 to 50° C. and under magnetic stirring conditions, and stir for 15 to 20 minutes each time to obtain a mixture, which is taken out for use.

[0051] Step 3. Under stirring conditions: first add the fused magnesia particles into the mixer, then add a mixture that accounts for 55 to 57 wt % of the mixture, and stir for 10 to 15 minutes; then add the fused magnesia fine powder, Stir for 10 to 15 minutes, then add the rest of the mixture, and stir for 10...

Embodiment 2

[0061] A low-carbon magnesium-carbon refractory material added with magnesium silicon nitride powder and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0062] Step 1. Use 43-46wt% fused magnesia particles, 39-42wt% fused magnesia fine powder, 6.5-7.5wt% flake graphite, 5-5.5wt% phenolic resin and 3-4wt% Magnesium silicon nitride powder is used as raw material and ingredients.

[0063] Step 2. Add the magnesium silicon nitride powder into the phenolic resin in 3 to 5 times at 40 to 50° C. and under magnetic stirring conditions, and stir for 15 to 20 minutes each time to obtain a mixture, which is taken out for use.

[0064] Step 3. Under stirring conditions: first add the fused magnesia particles into the mixer, then add the mixture accounting for 57-59 wt% of the mixture, and stir for 10-15 min; then add the fused magnesia fine powder, Stir for 10 to 15 minutes, then add the rest of the mixture, and stir for 10 to 15 min...

Embodiment 3

[0069] A low-carbon magnesium-carbon refractory material added with magnesium silicon nitride powder and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0070] Step 1. Using 46-49wt% fused magnesia particles, 36-39wt% fused magnesia fine powder, 6-7wt% flake graphite, 4.5-5wt% phenolic resin and 4-5wt% nitriding Magnesium silicon powder is used as raw material and ingredients.

[0071] Step 2. Add the magnesium silicon nitride powder into the phenolic resin in 3 to 5 times at 40 to 50° C. and under magnetic stirring conditions, and stir for 15 to 20 minutes each time to obtain a mixture, which is taken out for use.

[0072] Step 3. Under stirring conditions: first add the fused magnesia particles into the mixer, then add a mixture that accounts for 59 to 61 wt % of the mixture, and stir for 10 to 15 minutes; then add the fused magnesia fine powder, Stir for 10 to 15 minutes, then add the rest of the mixture, and stir for ...

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Abstract

The invention relates to a low-carbon magnesium-carbon refractory material added with silicon-magnesium nitride powder and a preparation method thereof. The technical scheme is: 40-55wt% fused magnesia particles, 30-45wt% fused magnesia fine powder, 5-8wt% flake graphite, 3.5-6wt% phenolic resin and 2-7wt% Silicon magnesium nitride powder is used as a raw material; under the condition of 40-50° C. and magnetic stirring, the silicon magnesium nitride powder is added into the phenolic resin in 3-5 times, and stirred for 15-20 minutes each time to obtain a mixture. Under stirring conditions, first add fused magnesia particles, then add part of the mixture, and stir; then add fused magnesia fine powder, stir, then add the rest of the mixture, and stir; finally add flake graphite, stir, press and form, solidify, In a high-temperature tube furnace in an argon atmosphere at 1200-1500° C. for 2 to 3 hours, then cool to prepare a low-carbon magnesium-carbon refractory material added with silicon magnesium nitride powder. The product manufactured by the invention has good thermal shock resistance and high mechanical properties at room temperature.

Description

technical field [0001] The invention belongs to the field of low-carbon magnesium-carbon refractory materials. In particular, it relates to a low-carbon magnesium-carbon refractory material added with silicon-magnesium nitride powder and a preparation method thereof. Background technique [0002] Magnesia carbon refractories are widely used in electric furnaces, converters, ladles, nozzles and slides because of their excellent thermal shock resistance, slag resistance and corrosion resistance. However, there are problems in the application of magnesium carbon materials such as easy oxidation, high heat loss and carbon addition to molten steel. Therefore, low-carbon magnesia-carbon bricks have become the main direction for the development of magnesia-carbon refractories. However, the reduction of carbon content will reduce the thermal conductivity of the material, increase the elastic modulus and deteriorate the thermal shock stability of the material. In addition, the red...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/043C04B35/622C04B35/626
CPCC04B35/043C04B35/622C04B35/62605C04B2235/3852C04B2235/3873C04B2235/425C04B2235/444C04B2235/602C04B2235/6562C04B2235/6567C04B2235/9607
Inventor 丁军王杏曹桂莲邓承继余超祝洪喜
Owner WUHAN UNIV OF SCI & TECH
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