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The physical and chemical indicators of high alumina bricks are important indicators that reflect the quality of high alumina bricks. They mainly include chemical composition, volume density, normal temperature compressive strength, load softening temperature, refractoriness, apparent porosity, linear change rate, and slag resistance. Wait, what are the physical and chemical indicators of high alumina bricks?
1. Chemical composition: The chemical composition mainly includes aluminum oxide, silica, iron oxide, etc. The higher the alumina content, the better the quality of the refractory bricks.
2. Volume density: The volume density of high alumina bricks is usually between 2.5-2.8g/cm3.
3. Compressive strength: It reflects the external pressure that high alumina bricks can withstand. In high-pressure environments such as high-temperature kilns, if the compressive strength of high-alumina bricks is low, it cannot provide a stable working environment for the kiln.
4. Load softening temperature: It reflects the temperature at which high alumina bricks deform under a constant compressive load at a specified temperature.
5. Refractory degree: refers to the highest possible temperature of refractory bricks. The refractory temperature of high alumina bricks is generally 1550℃-1790℃. It is an important indicator when selecting high alumina bricks for high-temperature kilns.
6. Apparent porosity: refers to the percentage of the volume of open pores to the total volume of the product. It reflects the density of high alumina bricks.
7. Linear change rate: Linear change rate refers to the percentage of the irreversible length change of the sample after it is fired according to the specified process conditions to the length before firing. The smaller the line change rate, the smaller the linear change rate, indicating the dimensional change of the material at high temperatures. The smaller, the better the thermal shock resistance.
8. Slag resistance: It reflects whether the high alumina brick has certain corrosion resistance to smelting slag, glass, etc.
The above are some common physical and chemical indicators of high alumina bricks. In addition, there are earthquake resistance, acid and alkali resistance, etc., which will not be introduced one by one here. When purchasing, we must choose based on the physical and chemical indicators of high alumina bricks. When purchasing refractory bricks for high-temperature kilns, you should also refer to them.
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