Slide plate refractory with silicon nitride added and production method thereof

A technology of refractory materials and silicon nitride, which is applied in the field of sliding refractory materials added with silicon nitride, can solve problems such as not being able to meet the requirements of use, and achieve the effects of improving oxidation resistance, increasing density, and improving thermal shock stability

Active Publication Date: 2010-07-14
HENAN RONGJIN HIGH TEMPERATRUE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carbon composite refractory material for the nozzle needs to be improved in terms of strength and thermal shock stability, which cannot meet the requirements of the rapid development of the modern iron and steel industry.

Method used

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  • Slide plate refractory with silicon nitride added and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: A sliding plate refractory material added with silicon nitride, the composition is shown in Table 1 by weight percentage, that is, the raw material composition is: 45% corundum, 15% zirconium mullite, 10% zirconium corundum, 2 % of silicon nitride, 3.5% of carbon black, 7% of metal silicon, 17.5% of alumina micropowder, plus 4% of phenolic resin binder. The phenolic resin is a thermosetting resin.

[0018] During production, first weigh the raw materials according to the proportion, mix them evenly, and get the mud material through mixing, then press and form it through a friction press, dry it at 200±10°C for 8 hours, and then burn it under a nitrogen atmosphere at 1300°C; After hooping, grinding and coating, the Al with silicon nitride added in the present invention can be made. 2 o 3 -ZrO 2 -Si 3 N 4 -C skateboard.

[0019] The mixing is carried out in two steps. First, the powder in the raw material is put into a kneader and mixed evenly to obtain a...

Embodiment 2

[0022] Embodiment 2: The composition is shown in Table 1, which is basically the same as Embodiment 1, the difference being:

[0023] During production, the raw materials are first weighed according to the proportion, mixed evenly, and mud is obtained through mixing, and then pressurized and formed by a friction press, dried at 200±10°C for 6 hours, and then fired at 1250°C under a nitrogen atmosphere. After hooping, grinding and coating, the Al with silicon nitride added is formed. 2 o 3 -ZrO 2 -Si 3 N 4 -C skateboard.

[0024] The obtained product has an apparent porosity of 2%, a normal-temperature compressive strength of 161MPa, and a high-temperature flexural strength of 29MPa. Its oxidation resistance and erosion resistance are excellent, and its thermal shock resistance is good.

Embodiment 3

[0025] Embodiment 3: The composition is shown in Table 1, which is basically the same as that of Embodiment 1, except that:

[0026] During production, the raw materials are first weighed according to the proportion, mixed evenly, and mud is obtained through mixing, and then pressurized by a friction press, dried at 200±10°C for 9 hours, and then fired at 1350°C under a nitrogen atmosphere. After hooping, grinding and coating, the Al with silicon nitride added is formed. 2 o 3 -ZrO 2 -Si 3 N 4 -C skateboard.

[0027] The obtained product has an apparent porosity of 3%, a normal temperature compressive strength of 176MPa, a high temperature flexural strength of 30MPa, and excellent oxidation resistance, erosion resistance and thermal shock resistance.

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Abstract

The invention relates to a slide plate refractory with silicon nitride added and a production method thereof. The slide plate is prepared by the following raw materials in percentage by weight: 45-65% of corundum, 10-25% of zirconia-mullite and/or zirconia-corundum, 2-8% of silicon nitride, 6-18% of alumina fine powder and the balance one or more of silicon metal, carbon black and graphite powder and a phenolic resin binder accounting for 4-6% of the total above raw materials. The production method is characterized by proportionally weighing the raw materials, uniformly mixing the raw materials, obtaining the mixture through mixing, press-forming the mixture, drying the formed mixture at 190-210 DEG C for 6-10h and then carrying out nitridation firing on the dried mixture at1200-1400 DEG C. The invention has the following benefits: by adding silicon nitride and reasonably adding other components according to the amount and ratios, the slide plate composite material with structure of Al2O3-ZrO2-Si3N4-C is formed, and the oxidation resistance of the slide plate is improved; and the apparent porosity of the refractory is 1-4%, the cold compression strength is 150-220MPa, the high temperature rupture strength is 28-33MPa and such performance indexes as the oxidation resistance, the scouring resistance, the thermal shock resistance and the like are all excellent or good.

Description

1. Technical field: [0001] The invention relates to a sliding nozzle sliding plate refractory material for steelmaking, in particular to a sliding plate refractory material added with silicon nitride and a production method thereof. 2. Background technology: [0002] Since the 1970s, sliding nozzles have become one of the important technological innovations in the rapid development of the steel industry. Now most of the ladles and tundishes at home and abroad are equipped with sliding nozzle systems. The slide plate is a key component of the sliding nozzle, and an important part that directly controls the molten steel and determines the function of the sliding nozzle. During use, this part needs to withstand the chemical erosion and physical erosion of the high-temperature molten steel for a long time, coupled with intense and transient heat. Impact and mechanical wear, the use conditions are extremely harsh, and at the same time, in order to realize the free opening and clo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 徐跃庆宋桂兰李宏宇徐跃刚梁保青张莹徐光雷
Owner HENAN RONGJIN HIGH TEMPERATRUE MATERIALS CO LTD
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