Method for manufacturing silicon oxynitride-bonded high aluminum-silicon carbide prefabricated member

A technology of silicon oxynitride and prefabricated parts, which is applied in the field of preparation of silicon oxynitride combined with high aluminum-silicon carbide prefabricated parts, can solve the problem of not finding silicon oxynitride, and achieve thermal spalling resistance and oxidation resistance Excellent performance, simple and feasible process, and low cost

Inactive Publication Date: 2014-07-02
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there are no literatures and published invention patents on silicon oxynitride combined with high aluminum-silicon carbide preforms

Method used

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Examples

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preparation example Construction

[0019] The preparation method of silicon oxynitride combined with high aluminum-silicon carbide preform of the present invention comprises the following steps:

[0020] a. Take 45-70 parts by weight of bauxite particles, 0-22 parts of mullite particles, 0-18 parts of andalusite particles, 0-8 parts of alumina fine powder, 0-10 parts of corundum fine powder, silicon carbide 5-12 parts of granule and fine powder, 1-5 parts of pure calcium aluminate cement, 0-6 parts of silica micropowder, 3-8 parts of alumina micropowder, 3-10 parts of silica fume, and the sum of the weight parts of the above raw materials 0.05-0.30 parts of water reducer, mix the above raw materials evenly, add water and stir evenly, then vibrate and cast to form a prefabricated body;

[0021] b. Place the prefabricated body prepared in step a in an environment of 25-50° C. for 12-24 hours, then remove the mold, dry it at 300° C., and then cool it down to room temperature naturally;

[0022] c. Put the prefabr...

Embodiment 1

[0027] In parts by weight, put 6 parts of white corundum fine powder, 8 parts of silicon powder, 5 parts of silicon carbide fine powder, 8 parts of alumina fine powder, 3 parts of pure calcium aluminate cement, and 0.15 parts of water reducer (additional) in the ball mill In the tank, dry mix evenly to obtain a mixed powder; sequentially add 55 parts of bauxite coarse particles and 15 parts of bauxite medium particles into the mixer and stir for 3-5 minutes, then add the mixed powder into the mixer, stir evenly, add water and mix evenly to form a mud Put the material into the mold, vibrate casting, demoulding after curing for 24 hours, and then dry at 300°C to get the prefabricated body.

[0028] Put the above materials in a nitriding furnace for nitriding and firing. Under the atmosphere of flowing nitrogen (purity not less than 99.9%), the temperature is raised to 1150°C at a rate of 80°C / hour and kept for 4 hours; at 60°C / hour Heat at a rate of 1230°C for 5 hours; heat at a...

Embodiment 2

[0031]In parts by weight, 5 parts of bauxite fine powder, 6 parts of silicon powder, 6 parts of silicon carbide fine powder, 3 parts of pure calcium aluminate cement, 6 parts of alumina micropowder, 4 parts of silica micropowder, and 0.20 parts of water reducer 50 parts of bauxite coarse particles, 16 parts of mullite medium particles, and 4 parts of silicon carbide medium particles were added to the mixer and stirred for 3-5 minutes. Then add the mixed powder into the mixer, stir evenly, add water and mix evenly to form a mud material, put it into the mold, vibrate and cast it into shape, remove the mold after curing for 24 hours, and then dry it at 300°C to obtain the green body.

[0032] Put the above materials in a nitriding furnace for nitriding and firing, in an atmosphere of flowing nitrogen (purity not less than 99.9%), raise the temperature to 1150°C at a rate of 100°C / hour, and keep it for 2 hours; at 90°C / hour Raise the temperature to 1250°C at a rate of 6 hours; ra...

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Abstract

The invention relates to a method for manufacturing a silicon oxynitride-bonded high aluminum-silicon carbide prefabricated member. The method comprises the following steps: with high aluminum (alumina, mullite and andalusite) particles, silicon carbide particles and fine powder, alumina powder, corundum powder, alumina micro powder, pure calcium aluminate cement, silica powder and silicon powder as raw materials, adding a water reducer, adding water and agitating evenly to form pug; manufacturing a blank body by vibrating casting and molding; and manufacturing the silicon oxynitride-bonded high aluminum-silicon carbide prefabricated member through high-temperature in-situ reaction in a nitrogen atmosphere. The silicon oxynitride-bonded high aluminum-silicon carbide prefabricated member manufactured by the method has the characteristics of being good in peeling resistance, low in cost, long in service life and the like, and can replace high aluminum-silicon carbide castable for a kilneye and a coal-injection duct of a rotary cement kiln at present.

Description

Technical field [0001] The present invention belongs to the field of steelmaking refractory material technology. Specifically, it involves a high aluminum particles (alum soil, Mo Lai, red pillar stone), silicon carbide particles and fine powder, alum soil fine powder, rigid jade fine powder, oxidation, oxidation, oxidationAluminum micro -powder, pure aluminum calcium cement cement, silicon microfin microfin, silicon powder, add water reduction, water and stir well to form a mud, pour in vibration, make the blank body, and prepare oxygen nitrogen in the atmosphere of nitrogen at the atmosphere of high temperature nitrogen.The preparation method of silicon-combined with high aluminum-silicon carbide prefabrication. Background technique [0002] The new dry method cement return kiln mouth and other parts and other parts are in the special parts of the high temperature, cement clinker, wear, cold and hot heat, and are on the special parts of the port.High requirements.At present, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 贾全利刘新红张举赵飞孙庚辰李富朝
Owner ZHENGZHOU UNIV
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