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Aluminum titanate-sialon-silicon carbide composite molten steel feeding port, and manufacturing method thereof

A technology of aluminum titanate and silicon carbide, applied in the field of aluminum titanate-sialon-silicon carbide composite upper nozzle and its manufacturing, can solve the problems of unfavorable multi-furnace continuous casting, poor corrosion resistance, limited service life, etc., and achieve Elimination of poor steel flow or blockage, enhanced slag corrosion resistance, and good corrosion resistance

Active Publication Date: 2012-02-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although fused silica can be used directly without baking, the quartz nozzle has poor corrosion resistance, which is not conducive to continuous pouring of multiple furnaces, and it is easy to make molten steel penetrate into non-metallic inclusions, which affects the quality of molten steel; aluminum carbon or aluminum carbon zirconium nozzles It is easy to block during use, which affects normal production; mullite upper nozzle has poor corrosion resistance; corundum and high alumina have poor thermal shock resistance and are easy to peel off during use
[0008] In recent years, the advanced casting technology of multi-furnace continuous casting and high-speed casting has been used to prevent air inhalation at the upper nozzle of the tundish, prevent aluminum oxide clogging, resist thermal shock peeling, corrosion resistance, wear resistance, high-strength mechanical properties, etc. Higher requirements have been put forward. None of the existing technical products can fully meet the comprehensive performance requirements of the upper nozzle use conditions for materials at the same time. The service life in the continuous casting process is limited, and it is difficult to meet the new casting process requirements. In addition, the molding process is more complicated. , higher manufacturing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] An aluminum titanate-sialon-silicon carbide composite upper nozzle, the preparation process includes the following steps:

[0032] (1) Mixing materials, the pre-synthesized aluminum titanate plus 8% resin by mass is mixed uniformly in the mixer and then granulated; the mixture is 55% silicon nitride, 35% aluminum nitride and 10% silicon powder by mass percentage. Mix in a ball mill, pour out and add 8% resin binder in a mixer to mix and granulate; by mass percentage, silicon carbide 78%, silicon powder 15%, and graphite 7% are mixed in a mixer Uniform, then add 10% resin binder by mass, mix and granulate.

[0033] (2) Molding, using the isostatic pressing process, the thickness ratio of aluminum titanate, sialon, and silicon carbide is controlled to be 1.5:1:1, and the raw materials of each part are weighed according to the required weight, and then added through a layering device Into the mold, aluminum titanate, sialon, and silicon carbide are pressed from the inside...

Embodiment 2

[0036] An aluminum titanate-sialon-silicon carbide composite upper nozzle, the preparation process includes the following steps:

[0037] (1) Mixing materials, the pre-synthesized aluminum titanate plus 10% resin by mass is mixed uniformly in the mixer and then granulated; the mixture is silicon nitride 58%, aluminum nitride 30%, and silicon powder 12% by mass percentage. Mix in a ball mill, pour out and add 10% resin binder by mass to mix and granulate in a mixer; by mass percentage, the ratio of silicon carbide 83%, silicon powder 12%, and graphite 5% is added to the mixer and mixed Uniform, then add 10% resin binder to mix and granulate.

[0038] (2) Molding, using the isostatic pressing process, the thickness ratio of aluminum titanate, sialon, and silicon carbide is controlled at 2:1.5:1.5, and after the raw materials of each part are weighed according to the required weight, they are added through a layering device Into the mold, aluminum titanate, sialon, and silicon c...

Embodiment 3

[0041] An aluminum titanate-sialon-silicon carbide composite upper nozzle, the preparation process includes the following steps:

[0042] (1) Mixing materials, the pre-synthesized aluminum titanate plus 12% resin by mass is mixed uniformly in a mixer and then granulated; by mass percentage, it is 56% of silicon nitride, 31% of aluminum nitride, and 13% of silicon powder. Mix in a ball mill, pour out and add 12% resin binder in a mixer to mix and granulate; by mass percentage, silicon carbide 80%, silicon powder 12%, and graphite 8% are mixed in a mixer Uniform, then add 12% resin binder to mix and granulate.

[0043](2) Molding, using the isostatic pressing process, the thickness ratio of aluminum titanate, sialon, and silicon carbide is controlled to be 3:1:2, and the raw materials of each part are weighed according to the required weight, and then added through a layering device In the mold, aluminum titanate, sialon, and silicon carbide are formed sequentially from the ins...

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PUM

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Abstract

The invention relates to an aluminum titanate-sialon-silicon carbide composite molten steel feeding port, and a manufacturing method thereof. A layered composite structure is adopted in the composite molten steel feeding port. The composite molten steel feeding port comprises materials of, from the inner side to the outer side: aluminum titanate, sialon, and silicon carbide, wherein a thickness ratio of the materials is in a range of: (1.5-3):(1-2):(1-3). According to the invention, the aluminum titanate-sialon-silicon carbide composite material is adopted, and a molten steel feeding port is manufactured through a one-time molding technology. With the method provided by the invention, blocking is not easy to occur during a casting procedure with the molten steel feeding port. The molten steel feeding port has advantages of good high-temperature resistance, good corrosion resistance, high mechanical strength, and long service life. When in use, the quality of molten steel is not influenced. The composite molten steel feeding port is suitable to be used in continuous casting of various common steels and variety steels.

Description

technical field [0001] The invention relates to an upper nozzle for continuous casting, in particular to an aluminum titanate-sialon-silicon carbide composite upper nozzle and a manufacturing method thereof. Background technique [0002] With the development of modern high-speed, high-efficiency continuous casting technology and clean steel smelting technology, further improving the performance of existing continuous casting functional refractory materials and developing new materials to meet the requirements of contemporary continuous casting technology are urgent problems to be solved at present. . The upper nozzle is a disposable refractory component used for continuous casting. It is installed at the bottom of the ladle or tundish, and the lower part is connected with the submerged nozzle. The upper nozzle is in direct contact with molten steel during use, so the use of the upper nozzle of the tundish is improved. The service life requires that its material should be ab...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 杨建华
Owner BAOSHAN IRON & STEEL CO LTD