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Refractory castable with high thermal shock resistance

A refractory castable and thermal shock resistance technology is applied in the field of high thermal shock resistance refractory castables, which can solve the problems of restricting the service life of industrial kilns and poor spalling resistance, achieve excellent thermal shock stability, and improve thermal shock resistance. The effect of loss of ability

Inactive Publication Date: 2015-11-18
鞍钢实业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, refractory castables generally have poor spalling resistance, which restricts the service life of industrial kilns. Therefore, it is necessary to improve the thermal shock stability of refractory castables, thereby enhancing the spalling resistance of refractory castables

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Preparation of castable:

[0023] Burnt gemstones with a particle size of 5-10mm: 23 parts; burnt gemstones with a particle size of 3-5: 18 parts; high-alumina bauxite with a particle size of 1-3mm: 17 parts; high-alumina bauxite with a particle size less than or equal to 1mm: 10 parts ; High alumina fine powder with particle size less than or equal to 0.088mm: 20 parts; α-alumina fine powder: 4 parts; silicon fine powder: 4 parts; zircon powder: 2 parts; Sodium 0.25 parts. Accurately weigh according to the above ratio, add water to mix and stir, and test the physical properties after molding, curing and heat treatment.

[0024] 2) Physical performance test: After drying at 110°C for 24 hours, check the thermal shock stability 25 times.

Embodiment 2

[0026] 1) Preparation of castable:

[0027] Burnt gems with a particle size of 5-10mm: 25 parts; burnt gems with a particle size of 3-5: 20 parts; high-alumina bauxite with a particle size of 1-3mm: 15 parts; high-alumina bauxite with a particle size less than or equal to 1mm: 10 parts ; high alumina fine powder with particle size less than or equal to 0.088mm: 16 parts; α-alumina fine powder: 5 parts; silicon fine powder: 3 parts; zircon powder: 3 parts; Sodium 0.2 parts.

[0028] Accurately weigh various raw materials according to the above ratio, add water to mix and stir, and test the physical properties after forming, curing and heat treatment.

[0029] (2) Physical performance test:

[0030] After drying at 110°C for 24 hours, the thermal shock stability was tested 27 times.

Embodiment 3

[0032] 1) Preparation of castable:

[0033] Burnt gems with a particle size of 5-10mm: 28 parts; burnt gems with a particle size of 3-5: 15 parts; high-bauxite with a particle size of 1-3mm: 10 parts; high-bauxite with a particle size less than or equal to 1mm: 15 parts ; high alumina fine powder with particle size less than or equal to 0.088mm: 17 parts; α-alumina fine powder: 4 parts; silicon fine powder 3 parts; zircon powder: 4 parts; Mixture of sodium and sodium tripolyphosphate 1 part. Sodium hexametaphosphate and sodium tripolyphosphate can be mixed in a ratio of 1:1.

[0034] Accurately weigh various raw materials according to the above ratio, add water to mix and stir, and test the physical properties after forming, curing and heat treatment.

[0035] 2) Physical performance test:

[0036] After drying at 110°C for 24 hours, the thermal shock stability was tested 28 times.

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Abstract

The invention relates to a refractory castable with high thermal shock resistance; the refractory castable includes flint clay, high-alumina bauxite, alpha-alumina micro-powder, silicon micro-powder, a binder and an additive, and particularly includes the raw materials by the mass percentage: 20-28 parts of flint clay, 15-25 parts of flint clay, 10-20 parts of high-alumina bauxite, 10-15 parts of high-alumina bauxite, 15-25 parts of high-alumina bauxite fine powder, 3-8 parts of the alpha-alumina micro-powder, 1-5 parts of the silicon micro-powder, 1-4 parts of a zirconite powder, 2-8 parts of the binder, and 0.1-2 parts of the additive. The refractory castable has the advantages that the refractory castable can achieve excellent thermal shock stability which is characterized in that zirconite can generate a decomposition reaction at high temperatures, and zirconia with a tetragonal crystal shape is produced and is changed into monoclinic zirconcia during cooling, that is to say, with the introduction of zirconite, a high temperature stress induced phase transformation toughening mechanism is formed in a matrix, microscopic cracks are produced in the interior of a material, and thus the thermal shock loss resistant ability of the material is improved.

Description

technical field [0001] The invention relates to a refractory pouring material with high thermal shock resistance. Background technique [0002] As the proportion of unshaped refractory materials in the application of refractory materials continues to increase, refractory castables have high density, low porosity, high strength and low wear due to the use of fine particle gradation, micropowder technology and high-efficiency binders and additives. , heat shock resistance, corrosion resistance and other characteristics, become a new generation of unshaped refractories. At the same time, in different application fields, the focus on improving the high temperature characteristics of a certain aspect will also be proposed accordingly. At present, refractory castables generally have poor spalling resistance, which restricts the service life of industrial furnaces. Therefore, it is necessary to improve the thermal shock stability of refractory castables, thereby enhancing the spal...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 关艳孙丽杰王超李纯宝赵宇卢艳霞唐建平
Owner 鞍钢实业集团有限公司
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