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Composite material containing nitride and submerged nozzle applying composite material

A composite material and nitride-containing technology, which is applied in the direction of casting molten material containers, manufacturing tools, metal processing equipment, etc., can solve the problems that the corrosion resistance does not meet the requirements of continuous casting production, it is easy to burst, and affects continuous casting operations, etc. , to achieve the effects of improving erosion resistance and thermal shock resistance, best erosion resistance and thermal shock resistance, and excellent mold slag erosion resistance

Inactive Publication Date: 2013-02-06
北京利尔高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although ZrO is added to the slag line 2 Composite materials, but its corrosion resistance has not yet reached the required standards for continuous casting production
[0003] The submerged nozzle is prone to diameter expansion due to long-term corrosion and erosion by molten steel during use, especially the slag line. , which affects the continuous casting operation and has a great impact on the steel mill
The slag line of the submerged nozzle is generally made of zirconium carbon material, that is, stabilized zirconia and graphite are used as the main raw materials, and a small amount of antioxidant is added. In order to improve the corrosion resistance, the content of zirconia is generally increased and the content of graphite is reduced. Although this can improve the corrosion resistance, due to the reduced graphite content, there are problems with thermal shock resistance, and it is often easy to burst

Method used

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  • Composite material containing nitride and submerged nozzle applying composite material
  • Composite material containing nitride and submerged nozzle applying composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Slag wire material: 80% fused stabilized zirconia (Zhenzhong Fused Zirconia Industry Co., Ltd., wherein the mass content of zirconia is 92-97%, and the fused stabilized zirconia within this content range can obtain composites with the same technical effect material), graphite 5%, Sialon 12% (purchased from Tangshan Hexagon Silicon Carbide Co., Ltd., where N is 14-30% by mass, and Sialon within this content range can achieve the same technical effect), metal silicon powder 3 %, plus 10% phenolic resin (both by mass ratio). Graphite is flake graphite with a carbon content of 99%.

[0028] The process of granulation and mixing is carried out in the granulator. When controlling the granulation, the granulation is controlled according to the low speed of 80r / min for 8 minutes, the medium speed of 500r / min for 5 minutes, and the high speed of 800r / min for 10 minutes. The material temperature in the granulation equipment is controlled is 55°C. After granulation, kneading and...

Embodiment 2

[0030] Slag wire material: 65% fused stabilized zirconia, 12% graphite, 20% Sialon, 3% metal silicon powder, plus 10% phenolic resin. Graphite is flake graphite with a carbon content of 98%.

[0031] The process of granulation and mixing is carried out in the granulator. When controlling the granulation, the granulation is controlled according to the low speed of 100r / min for 8 minutes, the medium speed of 550r / min for 5 minutes, and the high speed of 800r / min for 12 minutes. The material temperature in the granulation equipment is controlled at 40°C. After granulation, mixing and drying, it is compounded with the aluminum-carbon body, isostatically pressed (molding pressure 100MPa), sealed, and fired at 1100°C for 25 hours in a non-oxidizing atmosphere to produce an immersion type Nozzle has been used in 16 furnaces in a steel factory for 12 hours, and there is no phenomenon of bursting, diameter expansion, erosion, etc., which meets the customer's use requirements.

Embodiment 3

[0033] Slag wire material: 70% fused stabilized zirconia, 20% graphite, 5% sialon, 3% aron, 2% silicon carbide powder, plus 14% phenolic resin. Graphite is flake graphite with a carbon content of 99.5%.

[0034] The process of granulation and mixing is carried out in the granulator. When controlling the granulation, the granulation is controlled according to the low speed of 80r / min for 8 minutes, the medium speed of 600r / min for 5 minutes, and the high speed of 1000r / min for 15 minutes. The material temperature in the granulation equipment is controlled at 65°C. After granulation, mixing and drying, it is compounded with the aluminum-carbon body, isostatically pressed (molding pressure 80MPa), sealed, and fired at a temperature of 1000°C for 30 hours in a non-oxidizing atmosphere. Nozzle has been used in 20 furnaces in a steel factory for 8 hours, and there is no phenomenon of bursting, diameter expansion, erosion, etc., which meets the customer's use requirements.

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Abstract

The invention provides a composite material containing a nitride, which comprises the following components: electrofusion-stabilized zirconia, the nitride, graphite, silicon or silicon carbide. The invention further provides a submerged nozzle fabricated by adopting the composite material. The composite submerged nozzle prepared by taking the electrofusion-stabilized zirconia and graphite as well as one or more of the nitrides such as sialon, alon, MgAlON, silicon nitride, silicon nitride iron and boron nitride as major raw materials, and taking resin as a binding agent has excellent erosion resistance and thermal shock resistance. The electrofusion-stabilized zirconia has excellent casting powder erosion resistance, nitrogen compounds are introduced, and as the nitrogen compounds have the good characteristics that the nitrogen compounds are low in thermal expansion coefficient, high in thermal conductivity and high in strength and cannot moisten molten steel or casting powder, the erosion resistance and thermal shock resistance of the submerged nozzle are improved greatly.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to a composite material containing oxides and nitrides. Background technique [0002] The submerged nozzle is the passage of molten steel from the tundish to the mold, which is used to protect the molten steel from contact with the outside air, prevent the oxidation of the molten steel, promote the floating of non-metallic impurities, prevent the entrainment of mold slag in the molten steel, and prevent the flow of molten steel in the mold. . During the use of submerged nozzles, due to the mechanical erosion of high-temperature molten steel for a long time, the thermal stress caused by the temperature gradient of the nozzle wall diameter and the chemical erosion of mold slag, the service conditions are extremely harsh. The submerged nozzle plays multiple roles in high-speed continuous casting production, such as diverting flow, preventing secondary oxidation, stabilizing the flow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/482B22D41/54
CPCC04B2235/386C04B2235/3869C04B35/63476C04B35/482C04B2235/3873C04B2235/422C04B35/013C04B2235/428C04B2235/3826C04B2235/5292C04B2235/3852C04B2235/9676C04B35/62695C04B2235/762C04B35/62665C04B2235/5436C04B2235/425C04B35/63452
Inventor 鄢凤明刘丽曹仁锋赵伟王次明刘靖轩任林胡玲军赵冉张艳凤于久利车晓梅樊浩勇黄建
Owner 北京利尔高温材料股份有限公司
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