Tundish permeable brick and its preparing process

Abstract

The invention relates to a Al2O3-SiO2 tundish permeable brick and its preparing process which comprises, mixing the raw materials of (by weight ratio) 76-85% of adamantine spar, 5-20% of mullite, 2-10% of anchoring agent, 1-5% of silicon micronized quartz powder, 0.05-0.20% of dispersing agent, 7-9% of water, 5-20% of xerogel powder, 1-5% of AlF3 through stirring 6-8 minutes, cast forming, drying at 110 deg. C for 24h, 1200-1400 deg. C for 3h, wherein the xerogel powder is the gel produced from sol-gel mullite precursor.

Description

1. Technical field [0001] The invention belongs to Al 2 o 3 -SiO 2 Quality refractory technology field. Especially involving an Al 2 o 3 -SiO 2 Tundish breathable refractory material and method thereof. 2. Background technology [0002] Blow argon into the molten steel through the breathable brick installed at the bottom of the tundish for stirring to make the composition and temperature uniform, which can significantly remove non-metallic inclusions, tiny particles and reduce [O] content in the molten steel, and purify the molten steel . [0003] In the material selection of breathable materials, magnesium and corundum are generally popular at home and abroad. In use, because periclase and wurstite form a continuous solid solution, the magnesia breathable material has good resistance to the alkaline slag containing iron oxide and calcium oxide, but the magnesia has a large thermal expansion coefficient and a high elastic modulus , The thermal shock stability is poo...

AI Technical Summary

Problems solved by technology

[0006] Although the corundum-mullite breathable material has good air permeability, and its physical and chemical properties can also be w