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Preparation method of Al2O3-MgO-ZrO2 ladle air plug

A technology for venting plugs and ladles, applied in the field of refractory materials, can solve the problems of deteriorating high-temperature performance of venting plugs and affecting durability, and achieve the effects of no pollution, high durability, and excellent thermal shock resistance in molten steel scouring performance

Inactive Publication Date: 2004-07-28
WUHAN UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

The existence of the liquid phase greatly deteriorates the high temperature performance of the vent plug, thereby affecting the improvement of its durability

Method used

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Examples

Experimental program
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Embodiment

[0015] Example Al 2 o 3 -MgO-ZrO 2 The preparation method of high-quality ladle vent plug is that the weight ratio of its components is: Al 2 o 3 Tabular corundum with content ≥99.8% is 74-78%, zirconia corundum with zirconia content 15-25% is 15-20%, fused magnesia with MgO content ≥98% is 1-1.5%, Al 2 o 3 7-12% for high-alumina micropowder with content ≥99.8%, Al 2 o 3 Dispersed alumina content ≥ 75% is 0.5-1%, Al 2 o 3 The high-aluminum binder Alphabond with a content ≥ 99.4% is 2-3%, and the organic fiber is 0.06% (additional).

[0016] Particle gradation of each component: tabular corundum: 6-0mm, zirconium corundum: 1-0mm, fused magnesia: 1-0mm, high-alumina fine powder: 0.045-0mm, dispersive alumina: 0.045-0mm, The high aluminum binder Alphabond is 10-0nm.

[0017] Add 4.4% water to the mixture according to the above ratio, stir for 6 minutes (use the jump table method to measure the flow value of the castable after 30 vibrations of the castable is 162mm), and...

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Abstract

The present invention belongs to the field of refractory material by using alumina as base material. Its technical scheme is as follows: it is formed from plate corundum whose Al2O3 content is greater than or equal to 99.4%, zirconium corundum whose zirconium oxide content is 5-30%, electrofused magnesium sand whose MgO content is greater than or equal to 96%, high-aluminium micropowder whose Al2O3 content is greater than or equal to 99.4%, dispersion alumina whose Al2O3 content is greater than or equal to 75%, special adhesive and organic fibre. The above-mentioned materials are stirred with water, poured, dried and fired so as to obtain the invented product. It has high durability, good thermal-shock resistance, slag corrosion resistance and molten steel scouring abrasion resistance.

Description

1. Technical field [0001] The invention belongs to the field of refractory materials with alumina as the base material, and in particular relates to a preparation method for a ladle vent plug. 2. Background technology [0002] Blowing argon into the molten steel through the vent plug installed at the bottom of the ladle for stirring, uniform composition and temperature, accelerating the progress of various chemical reactions in the smelting process, reducing sulfur, phosphorus, oxides and other impurities in the molten steel, and protecting the molten steel play a purifying role. [0003] In terms of the material selection of vent plugs, magnesium and corundum are generally popular at home and abroad. In use, because periclase and wurstite (FeO) form a continuous solid solution, the magnesia vent plug has good resistance to alkaline slag containing iron oxide and calcium oxide, but the magnesia has a large thermal expansion coefficient and elastic modulus The amount is hig...

Claims

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Application Information

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IPC IPC(8): B22D41/00B22D41/54B22D41/58C04B35/106C04B38/06
Inventor 顾华志张文杰罗燕宇汪厚植
Owner WUHAN UNIV OF SCI & TECH
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