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Gradient material for castable and preparation method thereof

A gradient material and castable technology, applied in the field of refractory materials, can solve the problems of high temperature reaction expansion, easy hydration cracking, etc., and achieve the effects of stable properties, reduced weight, and low bulk density

Active Publication Date: 2017-05-10
浙江自立新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnesia has a huge amount of mineral deposits in the world, and its volume density is lower than that of bulk materials such as tabular alumina and fused corundum.

Method used

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  • Gradient material for castable and preparation method thereof
  • Gradient material for castable and preparation method thereof
  • Gradient material for castable and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method for a gradient material for castables, comprising the following steps:

[0035] (1) Al 2 o 3 Powder dispersed in water to prepare Al 2 o 3 Slurry, Al 2 o 3 Al in slurry 2 o 3 The mass fraction of powder is 30%, Al 2 o 3 60% mass fraction of the powder can pass through a 325-mesh sieve.

[0036] (2) Coating Al on the surface of magnesia particles by hanging slurry 2 o 3 slurry, that is, magnesia particles are immersed in Al 2 o 3 In the slurry, take it out after staying for a while, and coat a layer of Al on the surface of the magnesia particles 2 o 3 Slurry, Al 2 o 3 The thickness of the slurry layer is about 1mm.

[0037] (3) will be wrapped with Al 2 o 3 The magnesia particles in the slurry layer were placed in a sagger tunnel kiln and fired at 1750°C for 3 hours to obtain a gradient material.

[0038] Performance Characterization

[0039] Chemical Composition Testing

[0040] The core, transition layer and shell layer of the...

Embodiment 2～8

[0076] The experimental parameters of each embodiment are shown in Table 8. Unless otherwise specified, the experimental conditions are the same as in Example 1.

[0077] Table 8

[0078]

Embodiment 2

[0079] In embodiment 2, the surface of the magnesia particles is activated. The treatment method is: use a mixer with sharp parts inside to stir and shave the magnesia particles to make a fresh surface and optimize the reactivity of the magnesia particle surface.

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Abstract

The invention discloses a gradient material for a castable and a preparation method thereof. The gradient material is of a kernel-shell structure, wherein a kernel is made of magnesia particles, a shell layer is made of Al2O3 (aluminum oxide) material, and a transition layer which is formed by reaction of the magnesia particles and the Al2O3 at high temperature is arranged between the kernel and the shell layer. The preparation method comprises the following steps of covering Al2O3 slurry on the surface of the magnesia particle, and sintering for 0.5 to 10h at the temperature of 1100 to 1900 DEG C, so as to obtain the gradient material. The gradient material has the advantages that the property is stable, the volume density is low, the use property is excellent, the ore reserve of raw material is large, the raw material is effectively saved, the cost of the castable is reduced, and the use property of the castable is optimized.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a gradient material used for castables and a preparation method thereof. Background technique [0002] In recent years, due to the advantages of high labor production efficiency, good adaptability, and low raw material consumption, unshaped refractory materials have developed rapidly, and their proportion in refractory materials has continued to expand. important sign. [0003] As an advanced country in the world's refractory technology, Japan took the lead in becoming the country whose output of unshaped refractories exceeded that of shaped refractories in 1992. At present, the output of unshaped refractories in Japan accounts for about 70% of the total refractory materials, about 50% in the United States, 40% to 50% in European countries such as Britain, Germany, and France, and about 30% in China. However, China's total output of refractories exceeds 11 million tons, and ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/04C04B41/89
CPCC04B35/04C04B35/66C04B41/52C04B41/89C04B41/5046C04B41/5031
Inventor 宋雅楠赵义陈荣荣吴斌马铮
Owner 浙江自立新材料股份有限公司
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