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Sailon corundum refractory material for permeable ladle stopper and its prepn process

A technology of sialon corundum and refractory materials, which is applied in the field of refractory materials, can solve the problems that the machine press forming method is not suitable for complex shape processing, large-scale production restrictions, and high temperature of processed products, so as to achieve excellent slag erosion resistance and low raw material price Inexpensive, low processing temperature effect

Inactive Publication Date: 2006-03-01
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw materials involved, such as AlN and sintering aid rare earth compound Y 2 o 3 Expensive, machine press molding is not suitable for complex shape processing, and the temperature required for processing products is high, so its production cost is high, the process is complicated, and large-scale production is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Weigh a certain amount of fused brown corundum particles and fine powder, metal silicon powder, alumina micropowder, silica micropowder, pure calcium aluminate cement. Its weight percentage is: metal silicon powder 6-10%, alumina micro-powder 5-9%, silica micro-powder 2-5%, pure calcium aluminate cement 1.5-6.5%, brown corundum 70-75% . Among them, the gradation and weight ratio of brown corundum particles are: 8-5mm accounts for 20-30%, 5-3mm accounts for 15-20%, 3-1mm accounts for 10-15%, 1-0mm accounts for 5-10%, less than 0.088 accounts for mm5-10%.

[0012] The process conditions are as follows: put the above-mentioned mixture into a sand mixer for mixing, add 0.3% sodium phosphate water reducer and 5% water at the same time, and stir for 2 to 3 minutes. Vibrate 30 times on the platform, measure the flow value to be higher than 120mm, and then pour into molding. Naturally cured for 12 hours, demolded, dried in an oven at 110°C for 24 hours, and fired in a nitrog...

Embodiment 2

[0015] Weigh a certain amount of fused dense corundum particles and fine powder, metal silicon powder, alumina micropowder, silica micropowder, and dispersed alumina. The percentage by weight is: metal silicon powder 6-10%, aluminum oxide micro-powder 5-9%, silica micro-powder 2-5%, disperse alumina 1.5-6.5%, dense corundum 70-75%. Among them, the gradation and weight ratio of dense corundum particles are: 8-5mm accounts for 20-30%, 5-3mm accounts for 15-20%, 3-1mm accounts for 10-15%, 1-0mm accounts for 5-10%, less than 0.088mm accounts for 5-10%.

[0016] The process conditions are as follows: put the above-mentioned mixture into a sand mixer for mixing, add 0.3% sodium phosphate water reducer and 5% water at the same time, and stir for 2 to 3 minutes. Vibrate on the platform for 30 times, measure the flow value to be higher than 120mm, and then pour it into a mold. After 12 hours of natural curing, demould, put it in an oven to dry at 110°C for 24 hours, and burn it in a n...

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PUM

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Abstract

The refractory sialon corundum brick material for permeable ladle stopper is prepared with corundum 65-75 wt%, metal silicon powder 5-12 wt%, alumina powder 3-10 wt%, silica powder 1-5 wt%, pure calcium aluminate cement 0-8 wt%, dispersed alumina 0-10 wt%, water reducing agent 4-6 wt% and water 4-6 wt%, and through stirring, vibration forming, pouring to form permeating pre-fabricated part, drying, and nitrogenating and sintering directly in nitrogen atmosphere. The present invention has simple preparation process, low treating temperature, cheap material, and the prepared refractory material has excellent slag resistance, excellent molten iron fuse loss resistance, high heat shock stability, high wear resistance and high finished product rate.

Description

1. Technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a sialon corundum refractory material for a ladle vent plug and a preparation method thereof. 2. Background technology [0002] The venting plug for ladle is one of the main parts of the blowing device for molten steel. In addition to the erosion of slag, it also needs to play the air-permeable function endowed to it. Generally speaking, the materials of vent plugs used by different steelmaking plants are also different, such as corundum spinel, corundum mullite, high alumina corundum, chrome corundum, etc. Zirconium-mullite and corundum have poor high-temperature structural strength and weak erosion resistance, which affects their service life. High-alumina-corundum has good thermal stability and long service life, but the erosion and erosion losses are also large (Fan Tianxi et al. Trial of straight-through porous air bricks in 60t refining ladle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/599C04B35/10C04B35/66C04B35/626C04B35/64
Inventor 李亚伟金胜利李楠
Owner WUHAN UNIV OF SCI & TECH
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