Anti-flaking high alumina bricks are referred to as anti-flaking bricks or anti-flaking refractory bricks. Using high alumina bauxite clinker as the main raw material, introducing a small amount of ZrO2 (because ZrO2 is a phase change between monoclinic and tetragonal, which can improve the thermal shock stability of refractory bricks), adding a certain amount of composite binders and additives, By controlling the particle gradation of the mud, the refractory products made by molding and high temperature firing become anti-stripping high alumina bricks.
Specification of anti-stripping high alumina brick
The standard size of the anti-stripping high alumina brick is 230*114*65mm, and other sizes can be customized according to the drawings.
The performance principle of anti-stripping high alumina brick
The anti-stripping mechanism of the anti-stripping high alumina brick is due to the microstructure characteristics of ZrO2 that determine the anti-stripping performance.
(1) There are obvious micro-cracks around the ZrO2 aggregate, and there are obvious gaps between the aggregate and the surrounding corundum and mullite.
(2) The well-developed ZrO2 aggregates are columnar and form a layered distribution in the space. There are small slits between ZrO2, the size of which is only 1 to 5 μm, forming a channel structure. This kind of structure is stacked in disorder and twists and turns, which is conducive to stress transmission and dispersion.
(3) Mullite is well-developed and fibrous, intertwined with ZrO2 and corundum in space, forming a composite reinforced structure. Obviously, when ZrSiO4 decomposes at high temperature, it reacts with the surrounding A12O3 to form ZrO2 and mullite. The presence of ZrO2 crystals prevents the growth of fibrous mullite crystals and slab-columnar corundum, and is wrapped by it, so it appears around ZrO2. State of chaos.
(4) The petrographic analysis shows that the structure of corundum and mullite are interlaced, ZrO2 is interleaved, and there are microcracks around it, and the larger ZrO2 crystal itself and surroundings have radial microcracks.
Physical and chemical indexes of anti-stripping high alumina brick
Advantages of anti-stripping high alumina bricks
(1) High refractory temperature.
(2) 0.2MPA load softening temperature is greater than 1500 degrees.
(3) Excellent thermal shock resistance, 1100 degrees water cooling is greater than 25 times.
(4) High compressive strength at room temperature, greater than 60MPA.
(5) Low apparent porosity and stable volume at high temperature.
(6) Excellent peeling resistance.
(7) Good chemical resistance.
Use of anti-stripping high alumina brick
Anti-stripping high alumina bricks are widely used in my country's new dry-process kilns, Lippo kilns and wet-process kilns. The parts used include kiln door covers, rising flues, cooling belts, decomposition belts, safety belts, transition belts, and coolant rear The walls and side walls, as well as the cross beams, are curved.
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