MgAlON combined aluminum magenisum permeable brick and preparation method thereof

Abstract

The invention particularly relates to an MgAlON combined aluminum magenisum permeable brick and a preparation method of the MgAlON combined aluminum magenisum permeable brick. The technical scheme comprises the following steps of: taking 55-65 wt% of sintered corundum grains, 25-35 wt% of aluminum oxide fine powder, 2-10 wt% of metal aluminum powder and 2-10 wt% of fused magnesite fine powder as raw materials; then, additionally adding phenolic resin which is 2-6 wt% of the raw materials and grinding and agitating; carrying out mechanical pressing; drying under the condition of 180-220 DEG C for 12-24 hours; raising the temperature to 1500-1700 DEG C by a temperature-rising speed of 2-5 DEG C / min; and keeping the heat for 3-5 hours to prepare the MgAlON combined aluminum magenisum permeable brick. The prepared MgAlON combined aluminum magenisum permeable brick has the characteristics of high density, larger high-temperature strength, good thermal shock resistance, capability of being not wetted by liquid steel and strong corrosion resistance to slag.

Description

technical field [0001] The invention belongs to the technical field of aluminum-magnesia gas permeable bricks. In particular, it relates to a MgAlON bonded aluminum-magnesia gas permeable brick and a preparation method thereof. Background technique [0002] Corundum-spinel refractories not only have good high temperature resistance and slag resistance, but also K 2 O and Na 2 O has strong sulfate aggressiveness, excellent volume stability and resistance to free CO in reducing atmosphere. 2 , SO 2 and SO 3 Corrosion is good. Corundum and spinel have similar thermal expansion coefficients, so that the material will not crack due to the difference in thermal expansion, and is widely used in ladle lining. [0003] At present, the ladle breathable brick core used in industry is mainly made of corundum-spinel, and a small amount of Cr is added to some of them. 2 o 3 Or chrome corundum to improve the slag erosion resistance, permeability and thermal shock stability of the m...

AI Technical Summary

Problems solved by technology

Hoffmanna.S et al. (Hoffmanna.S, Norbergb.S.T, Yoshimura.M, Strutctural models for intergrowth structures in the phase system A12O3-TiO2 ) studies have shown that aluminum titanate has different thermal expansion coefficients in the direction of each crystal axis, and it is easy to produce grain boundary cracks during the cooling process, which plays a toughening role. Adding it to corundum-spinel materials can improve the thermal shock of the material Stability, but aluminum titanate is unstable, easy to decompose and lose its effect at 900~1350°C

Jia Quanli et al. (Jia Quanli, Ye Fangbao, Zhong Xiangchong. Effect of ZrO2 addition on properties of corundum-spinel castables. Refractories. 2009, 43(1) 27~30.) in corundum-spinel The introduction of ZrO2 into the spar material, the use of ZrO2 phase transformation toughening improves the thermal shock stability of the material, but reduces the high temperature strength of the material, and at the same time due to the ZrO2 sub>2 phase transition produces a certain volume change

Xue Wendong (Xue Wendong. Research on material, pass design and application of air supply components for refining ladle [D]. Beijing: Doctoral Dissertation of Beijing University of Science and Technology. 2003.) studied corundum-silicon nitride breathable bricks and improved material properties , but the introduction of metal silicon makes SiO2 formed at high temperature, which has an adverse effect on the slag resistance of the material