High-quality chrome corundum brick for heating furnace
May 12, 2022
The raw material used in the chrome corundum series products is a solid solution which is synthesized by high temperature melting of alumina and chromia in a certain proportion. The use of special refractory production technology to make refractory bricks can improve and improve the intrinsic quality of the products and improve the high temperature performance of the products. The initial molding color of chrome corundum brick is green. After high temperature sintering, an oxidation reaction will occur, and the color after the reaction will change according to the content of Cr2O3 in the product. If the content of Cr2O3 is about 3%, the color will appear light reddish red, and it will appear purple red at about 8%. More than 20% of the color will appear black and red, and the higher the chromium content, the more black the color will be.
One: The softening temperature of chrome corundum brick under load.
The refractoriness (>1790℃) and softening temperature under load (>1700℃) of chrome corundum bricks are better than those of high-purity corundum products.
Two: the strength of chrome corundum brick
This is because during the firing process of the product, an AL2O3-Cr2O3 solid solution is formed between the particles and between the particles and the subdivisions. The solid solution links the particles and fine powder together like a bridge, making the material stronger. improve.
Three: thermal shock stability of chrome corundum brick
According to the data, when Cr2O3 is added to corundum, when the Cr2O3 content is 10%~66%, the thermal shock stability of the material decreases with the increase of Cr2O3 content. The Cr2O3 content of high-performance chrome corundum bricks popularized and applied by our factory is between 12% and 20%.
Four: slag corrosion resistance of chrome corundum bricks
Cr2O3 or Cr2O3-containing refractories have good corrosion resistance to steel slag, non-ferrous smelting slag, coal gasification slag, oil gasification slag and various glass melts. The viscosity of the liquid phase formed by the reaction of Cr2O3 melt or Cr2O3 with slag is higher than that of other low melts.
Five: the scope of application
The use effect of the chrome corundum bricks produced by our company in the steel industry is more than double the service life of corundum materials. Better than other bricks: In the carbon black industry, chrome corundum bricks have twice the life span of corundum bricks used under the same conditions.
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