The principle of anti peeling of high alumina bricks is to improve the ability to produce crack resistance lines and resist crack propagation.
The commonly used technique for anti stripping high alumina bricks is to add raw materials with different coefficients of expansion to the ingredients. Due to thermal expansion mismatch, cracks are left in the product after firing. The main raw materials added are kyanite, sillimanite, and zircon. Blue gemstone decomposes at 1325-1350 ℃ and completes decomposition at 1450 ℃, with a volume expansion of 16% -18%
; The decomposition temperature of sillimanite is 1500 ℃, with a volume expansion of 8.4%. Redstone decomposes at 1400 ℃, and after decomposition at 1500 ℃, its volume expansion is 3.29%. The toughening of zircon is achieved through the crystal transformation of tetragonal zirconia and monoclinic zirconia and the mullite effect. Adding zircon raw materials appropriately to high alumina bricks can greatly improve their wear resistance and anti stripping performance.
Product Features
(1) Has good high temperature resistance and strong corrosion resistance;
(2) Has certain mechanical strength, friction resistance, and good thermal shock resistance;
(3) Long service life.
Anti peeling mechanism of high alumina anti peeling brick
Anti peeling high alumina bricks are mainly made of high alumina bauxite, with a small amount of ZrOz introduced (due to the phase transition between monoclinic and tetragonal ZrO2, the thermal shock stability of the product can be improved), and a certain amount of composite binders and additives added. By controlling the particle size distribution of the clay, the refractory bricks produced by molding and high-temperature firing become anti peeling high alumina bricks
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