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High-alumina brick is a calcined high-alumina bauxite clinker and a binder that are first granulated and pulverized, then mixed at a certain ratio, and then pressed and fired at high temperature. According to the physical and chemical indicators are divided into five brands LZ-80, LZ-75, LZ-65, LZ-55, LZ-48. Mainly used in high temperature parts of industrial kiln.
Physical and chemical indicators:
|Al2O3 % ≥||80||75||65||55||48|
|Apparent porosity % ≤||21||24||24||22||22|
|Compressive strength at room temperature Mpa ≥||70||60||50||45||40|
|0.2MPaLoad softening start temperature ℃ ≥||1530||1520||1500||1450||1420|
|Heating permanent line change %||1500℃×2h -0.4～+0.2||1450℃×2h -0.4～+0.1|