Non-sintering sialon bonded corundum-spinel castable and method for preparing RH (Ruhstahl Hausen) insert tube prefabricated member inner core with same

A spinel, castable technology, applied in the field of refractory materials, to achieve the effects of low expansion coefficient, improved thermal shock stability, and improved service life

Active Publication Date: 2014-06-25
郑州市裕丰耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The non-fired sialon bonded corundum-spinel castable of the present invention adopts sialon bond, which overcomes the influence of the existence of CaO in the existing traditional castable cement on the high temperature performance and corrosion resistance of the prefabricated parts, thereby greatly improving the High temperature strength and thermal shock stability of the material of the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The non-fired sialon bonded corundum-spinel castable of the present invention is represented by weight percentage, and the raw material composition is: 62% fused white corundum, 14% spinel, 3% metal silicon powder, 200 mesh electricity Fused white corundum 11%, α-alumina 3% and ρ-alumina 7%, add additive FS60 in addition, the addition amount of additive FS60 accounts for 0.1% of the total weight of the above-mentioned various raw materials.

[0029] The fused white corundum 62% is composed of 10-6mm fused white corundum 18%, 6-3mm fused white corundum 22%, 3-1mm fused white corundum 16% and 1-0mm fused white corundum 6%;

[0030] The spinel 14% is composed of 1-0mm spinel 5%, 320 mesh spinel 7% and 5μm spinel 2%; the particle size of the metal silicon powder is 0.074mm, and the α-oxidized The particle size of aluminum is 5 μm.

Embodiment 2

[0032] The present invention uses the method for preparing the inner core of the RH insertion tube prefabricated part by using the non-fired sialon combined with the corundum-spinel castable described in Example 1, and the preparation method is:

[0033]Weigh various raw materials according to the ratio of castables described in Example 1, put the various raw materials in a mixer and mix them uniformly, add water during the stirring process, the amount of water added accounts for 3.5-4.0% of the total weight of each raw material, After mixing evenly, place the obtained castable in a mold for vibration casting and molding, the vibration time is 30 minutes; after casting and molding, it is naturally cured at 25 °C for 48 hours, demoulded, and placed at 25 °C for 48 hours after demoulding; Dry at 260°C for 24 hours, and then fire the product in a nitriding furnace at a temperature of 1420°C for 35 hours; after firing, cool to room temperature and leave the furnace to obtain a RH i...

Embodiment 3

[0037] Embodiment 3: basically the same as Embodiment 1, the difference is:

[0038] The non-fired sialon bonded corundum-spinel castable of the present invention is represented by weight percentage, and the raw material composition is: 66% fused white corundum, 12% spinel, 5% metal silicon powder, 200 mesh electricity Fused white corundum 9%, α-alumina 3% and ρ-alumina 5%, add additive FS60 in addition, the addition amount of additive FS60 accounts for 0.08% of the total weight of the above-mentioned various raw materials.

[0039] The fused white corundum 66% is composed of 22% fused white corundum of 10-6mm, 20% of fused white corundum of 6-3mm, 19% of fused white corundum of 3-1mm and 5% of fused white corundum of 1-0mm;

[0040] The 12% spinel is composed of 4% 1-0mm spinel, 4% 320 mesh spinel and 4% 5μm spinel.

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Abstract

The invention discloses a non-sintering sialon bonded corundum-spinel castable and a method for preparing an RH (Ruhstahl Hausen) insert tube prefabricated member inner core with the same. The castable comprises the following raw materials: 50-72% of fused white corundum, 8-21% of spinel, 2-9% of silicon metal powder, 3-11% of 200-mesh fused white corundum, 2-6% of alpha-alumina and 3-7% of rho-alumina; besides, an additive FS60 with weight accounting for 0.04-0.13% of total weight of various raw materials is added. The castable and the method have the beneficial effects that as the castable adopts sialon bonding, impacts of existence of CaO in existing traditional castable cement on the high temperature property and corrosion resistance of the prefabricated member are overcome, thus greatly improving the high temperature strength and thermal shock resistance of the castable; in combination with the 1700 DEG C service conditions of the product, generation of sialon in the service process is achieved, the production cost is effectively reduced, and the service life of the product is prolonged by 30-50%.

Description

Technical field [0001] The present invention involves a kind of pouring, which is the field of refractory materials. It specifically involves a method of spinning into a Cyprin-spine-spine-spine-spine-spine-spine-spine-spine-spine-spine-spine-spine-spine-spine-spine-spine-spine-spine-spikes. Background technique [0002] With the development of new smelting technology (such as clean steel production, steel bag refining technology, and continuous casting technology), it has put forward more demanding requirements for the service life of refractory materials. [0003] The Rh vacuum circulation dehydration furnace is a steel water refining equipment between steelmaking and linked. Its role is to improve the quality of steel water and meet high -value and high value -added products such as IF steel.Carbon, dehydration, off -gas, desulfurization, alloyization and composition adjustment, temperature adjustment, etc.The RH processing process has a series of advantages such as high refin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C21C7/10
Inventor 张会敏张景倚郑化
Owner 郑州市裕丰耐火材料有限公司
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