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

A technology for prefabricated parts and corundum, which is applied in the field of high temperature nitriding process to prepare β-Sialon combined corundum prefabricated parts, can solve the problem of no retrieval, etc., and achieve the effects of high service life, simple and feasible process, and good high temperature mechanical properties.

Inactive Publication Date: 2012-01-25
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, there is no retrieval of the same technology as this technology about the in-situ formation of β-Sialon composite corundum preforms 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

[0032] According to the weight ratio: 30 parts of fused white corundum, 54.4 parts of tabular corundum, 2.3 parts of elemental silicon powder, 0.3 parts of surface-treated metal aluminum powder, 3.0 parts of hydrated alumina, 10 parts of alumina powder, as dispersant 0.15 parts of organic water reducing agent (polyethylene glycol); put the materials prepared according to the above ratio in a mixer and stir for 3-5 minutes, add 4.4% of the total amount of water to mix, and vibrate and cast. After curing for 24 hours After demoulding, the green body is obtained after drying at 300°C.

[0033] Place the green body in a nitriding furnace for nitriding. Under a flowing nitrogen atmosphere with a purity of not less than 99.9%, heat up to 1050°C for 1 hour at a rate of 120°C / hour; heat up to 1250 at a rate of 60°C / hour ℃, keep it for 3 hours; continue to heat up to 1350℃ at a rate of 30℃ / hour for 3 hours; finally, at a rate of 60℃ / hour, heat up to 1460℃ and keep it for 8 hours; when coo...

Embodiment 2

[0036] According to the weight ratio, 30 parts of fused brown corundum, 53.8 parts of tabular corundum, 4.6 parts of elemental silicon powder, 0.6 parts of surface-treated metal aluminum powder, 2.0 parts of hydrated alumina, 8 parts of alumina powder, and silica powder 1 part, 0.20 part of organic water reducing agent (polyethylene glycol) as a dispersant, put it in a mixer and stir for 3-5 minutes, add 4.5% of the total amount of water in the mixture, mix evenly, and vibrate and cast. After curing for 24 hours, demold , After drying at 300°C, the green body is obtained.

[0037] Place the green body in a nitriding furnace for nitriding. In a flowing nitrogen atmosphere with a purity of not less than 99.9%, heat up to 950°C at a rate of 100°C / hour for 2 hours; heat up to a temperature of 80°C / hour Keep the temperature at 1280°C for 4 hours; continue to heat up to 1350°C at a rate of 40°C / hour for 5 hours; finally heat up to 1500°C at a rate of 60°C / hour for 10 hours; turn off th...

Embodiment 3

[0040] According to the parts by weight ratio, 78.2 parts of fused white corundum, 9 parts of elemental silicon powder, 1.3 parts of surface-treated metal aluminum powder, 1.5 parts of hydrated alumina, 10 parts of alumina micropowder, and organic water reducing agent (poly Acrylic) 0.18 parts are placed in a mixer and stirred for 3-5 minutes, then 4.8% of the total amount of water is added to the mixture and mixed uniformly, and then vibrated and poured into shape. After curing for 24 hours, it is demoulded and dried at 300°C to obtain a green body.

[0041] Place the green body in a nitriding furnace for nitriding. In a flowing nitrogen atmosphere with a purity of not less than 99.9%, heat up to 950°C at a rate of 80°C / hour for 1 hour; heat up to a temperature of 60°C / hour 1280℃, heat preservation for 5 hours; continue to heat up to 1350℃ at a rate of 30℃ / hour for 4 hours; finally heat up to 1520℃ at a rate of 30℃ / hour for 6 hours; when cooling to 800℃, turn off nitrogen and con...

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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

[0001] technical field [0002] 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 [0003] 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. [0004] Oxide-non-oxide composites have attracted much attention due to their excellent th...

Claims

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Application Information

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Patent Type & Authority Applications(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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