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Sintered silicon nitride and magnesium oxide-carbide refractory and preparation method thereof

A refractory material, magnesium oxide technology, applied in the field of fired refractory materials, can solve problems such as low strength and affecting the life of clean steel quality lining materials, and achieve good oxidation resistance, excellent slag resistance and thermal shock resistance, Raw material rich effect

Inactive Publication Date: 2012-07-18
北京炜润达冶金材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual application of this material, there have been problems such as carburization of molten steel and low strength during high temperature use, which have affected the quality of clean steel and the life of the lining material. Finding a new alternative oxide-non-oxide refractory material is refractory The focus of attention of the material and metallurgical industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A fired silicon nitride bonded magnesium oxide-carbonaceous refractory material and a preparation method thereof. First, 50~55wt% of fused magnesia particles, 15~20wt% of graphite powder and 25~30wt% of elemental silicon powder are used as raw materials, and 7~10wt% of the raw materials are added as a binder, and mixed for 5~10 minutes. Press molding, dry at 60~110°C for 12~18 hours; then heat up to 1280~1310°C under nitrogen atmosphere, keep warm for 25~30 hours, and then heat up to 1450~1500°C under nitrogen atmosphere , heat preservation for 7 to 8 hours, and natural cooling to prepare fired silicon nitride combined with magnesia-carbon refractories.

[0015] In this embodiment, the binder is calcium lignosulfonate.

Embodiment 2

[0017] A fired silicon nitride bonded magnesium oxide-carbonaceous refractory material and a preparation method thereof. First, 60~65wt% sintered magnesia particles, 10~15wt% graphite powder and 25~30wt% elemental silicon powder are used as raw materials, plus 3~7wt% binder of the raw materials, mixed for 10~15 minutes, and pressed Molding, drying at 100~150°C for 18~24 hours; then heating up to 1310~1340°C under nitrogen atmosphere, keeping it warm for 20~25 hours, and then heating up to 1500~1550°C under nitrogen atmosphere, Keep warm for 6-7 hours, cool naturally, and make fired silicon nitride combined with magnesia-carbon refractory.

[0018] In this embodiment, the binding agent is polyvinyl alcohol.

Embodiment 3

[0020] A fired silicon nitride bonded magnesium oxide-carbonaceous refractory material and a preparation method thereof. First, 65~70wt% fused magnesia particles, 3~10wt% graphite powder and 20~27wt% elemental silicon powder are used as raw materials, and 1~4wt% of the raw material is added as a binder, and mixed for 15~20 minutes, Press molding, dry at 150~180°C for 24~30 hours; then heat up to 1340~1370°C under nitrogen atmosphere, keep warm for 15~20 hours, and then heat up to 1550~1600°C under nitrogen atmosphere , keep warm for 5-6 hours, and cool naturally to prepare fired silicon nitride combined with magnesia-carbon refractory.

[0021] In this embodiment, the binding agent is industrial dextrin powder.

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Abstract

The invention particularly relates to a sintered silicon nitride and magnesium oxide-carbide refractory and a preparation method thereof. The technical scheme is as follows: adopting 50-75wt% of fused magnesia particles or sintered magnesia particles, 3-20wt% of graphite powder and 5-40wt% of simple-substance silicon powder as the raw materials; adding a binding agent accounting for 1-10wt% of the raw materials; mixing for 5-30 minutes; performing compression moulding; drying for 12-36 hours at the temperature between 60 and 200 DEG C; preserving heat for 1-30 hours in nitrogen atmosphere at the temperature between 1280 and 1410 DEG C; raising the temperature to 1450 to 1700 DEG C in nitrogen atmosphere and preserving heat for 3-8 hours for sintering; and cooling naturally. The refractory has the characteristics of abundant raw materials, excellent anti-oxidation property, high high-temperature strength, less recarburization on molten steel, excellent corrosion resistance and long service life. The refractory which is beneficial for improvement of steel quality is applicable to novel furnace lining materials of non-ferrous metal and steel smelting equipment, especially for steel ladle lining and finery lining used for producing clean steel such as low-carbon steel and ultralow-carbon steel.

Description

technical field [0001] The invention belongs to the technical field of fired refractory materials, and in particular relates to a fired silicon nitride combined magnesium oxide-carbon refractory material and a preparation method thereof. Background technique [0002] In the past two decades, carbon-containing refractory materials have been widely used in high-performance refractory materials due to their excellent performance. However, in the actual application of this material, there are problems such as carburization of molten steel and low strength during high temperature use, which affects the quality of clean steel and the life of the lining material. Looking for new alternative oxide-non-oxide refractory materials is refractory The focus of attention of the material and metallurgical industry. [0003] Although magnesium oxide-carbon refractory has its special advantages such as good thermal shock stability and strong slag erosion resistance, it has poor carburization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 朱万政邓承继成忠东祝洪喜彭耐员文杰李君
Owner 北京炜润达冶金材料有限公司