In-situ formed beta-Sialon combined corundum prefabricated member and production method thereof

A technology of prefabricated parts and corundum, which is applied in the field of high temperature nitriding process to prepare β-Sialon combined with corundum prefabricated parts, which can solve the problems such as not being retrieved, and achieve the effects of long service life, excellent thermal spalling resistance and good high temperature mechanical properties

Inactive Publication Date: 2012-12-05
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there is no retrieval of the same technology as the present technology about the in-situ formation of β-Sialon composite corundum preform preparation method with the addition of surface-treated Al powder Documents and published invention patents (for the surface treatment method of metal Al powder, please refer to the document "Improving hydration resistance of Al powder for carbon containing castables using inorganic–organic hybrid coatings. Advances in Applied Ceramics, 2005, 104 (2) 2: 79-82")

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] According to the ratio of parts by weight: 30 parts of fused white corundum, 54.4 parts of tabular corundum, 2.3 parts of simple silicon powder, 0.3 parts of surface-treated metal aluminum powder, 3.0 parts of hydrated alumina, 10 parts of alumina micropowder, as a dispersant 0.15 parts of organic water reducer (polyethylene glycol); put the material prepared according to the above ratio in a mixer and stir for 3-5 minutes, add 4.4% water of the total amount of the mixture, mix evenly, vibrate and cast, and maintain for 24 hours Release the mold and dry at 300°C to obtain the green body.

[0031]Place the green body in a nitriding furnace for nitriding. Under a flowing nitrogen atmosphere with a purity of not less than 99.9%, the temperature is raised to 1050°C at a rate of 120°C / hour and kept for 1 hour; the temperature is raised to 1250°C at a rate of 60°C / hour. ℃, keep warm for 3 hours; continue to heat up to 1350°C for 3 hours at a rate of 30°C / hour; finally raise t...

Embodiment 2

[0034] According to the ratio of parts by weight, 30 parts of fused brown corundum, 53.8 parts of tabular corundum, 4.6 parts of simple silicon powder, 0.6 parts of surface-treated metal aluminum powder, 2.0 parts of hydrated alumina, 8 parts of alumina micropowder, and 8 parts of silica micropowder 1 part, 0.20 parts of organic water reducer (polyethylene glycol) as a dispersant, placed in a mixer and stirred for 3-5 minutes, added 4.5% of the total amount of water, mixed evenly, vibrated and casted, and demoulded after 24 hours of curing , After drying at 300°C, the green body was obtained.

[0035] Place the green body in a nitriding furnace for nitriding, and in a flowing nitrogen atmosphere with a purity of not less than 99.9%, raise the temperature to 950°C at a rate of 100°C / hour and keep it for 2 hours; raise the temperature to 80°C / hour to 1280°C, keep warm for 4 hours; continue to heat up to 1350°C at a rate of 40°C / hour for 5 hours; finally raise the temperature to ...

Embodiment 3

[0038] According to the ratio of parts by weight, 78.2 parts of fused white corundum, 9 parts of simple silicon powder, 1.3 parts of surface-treated metal aluminum powder, 1.5 parts of hydrated alumina, 10 parts of alumina micropowder, and an organic water reducing agent (polyethylene oxide) as a dispersant Acrylic acid) 0.18 parts were placed in a mixer and stirred for 3-5 minutes, then added 4.8% of the total amount of water to mix evenly, then vibrated and casted, cured for 24 hours, demoulded, and dried at 300°C to obtain a green body.

[0039] Place the green body in a nitriding furnace for nitriding. Under a flowing nitrogen atmosphere with a purity of not less than 99.9%, the temperature is raised to 950°C at a rate of 80°C / hour and kept for 1 hour; the temperature is raised to 60°C / hour to 1280°C, keep warm for 5 hours; continue to heat up to 1350°C at a rate of 30°C / hour for 4 hours; finally raise the temperature to 1520°C at a rate of 30°C / hour for 6 hours; turn off n...

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Abstract

The invention discloses an in-situ formed beta-Sialon combined corundum prefabricated member and a production method thereof. The prefabricated member is formed by adopting the following steps of: with elemental silicon powder, corundum particles and fine powder as raw materials and with hydrated alumina, activated alumina micropowder and silicon dioxide micropowder as binding agents, adding metal aluminum powder treated by adopting a sol-gel process; adding water, vibrating, pouring and forming; demoulding, curing and drying; and reacting and sintering in the nitrogen gas atmosphere to obtain the prefabricated member. The prefabricated member comprises the following components in parts by weight: 70-80 parts of corundum particles, 3-12 parts of alumina micropowder, 0-5 parts of silicon dioxide micropowder, 0.5-5 parts of hydrated alumina, 3-15 parts of elemental silicon powder, 0.3-2 parts of metal aluminum powder subjected to surface treatment and 0.05-0.30 part of organic water reducing agent as a dispersing agent, based on the total weight percentage of the raw materials. According to the invention, the defects of poor thermal shock resistance, poor stripping resistance, high temperature and low strength in the currently-general corundum-based castable are overcome; and the in-situ formed beta-Sialon combined corundum prefabricated member can be expected to be applied to ceramic cups of blast furnaces, ladle liners, permeable bricks for ladles, chemical industries and the like as well as has the characteristics of high strength, favorable stripping resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, specifically a corundum particle and fine powder, alumina micropowder, silicon dioxide micropowder, elemental silicon powder, and aluminum powder as main raw materials, which are formed by adding water and vibrating, and passed through a high-temperature nitriding process. Preparation of β-Sialon bonded corundum preforms and methods thereof. Background technique [0002] Corundum-based castables are widely used in high-temperature metallurgy. With the advancement of metallurgical technology, the smelting temperature continues to increase, and the volume of smelting vessels is gradually enlarged, which puts forward higher requirements for refractory materials. Corundum-based castables are poor The thermal shock resistance limits the further improvement of its service life. [0003] Oxide-non-oxide composites have attracted much attention due to their excellent thermal pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/103C04B35/66C04B35/622
Inventor 贾全利叶方保张宇翠梁敏钟香崇
Owner ZHENGZHOU UNIV
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