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magnesia brick
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Magnesia bricks are divided into fired magnesia bricks and unfired magnesia bricks. Fired magnesia bricks are divided into silicate-bonded magnesia bricks, directly-bonded magnesia bricks, and re-bonded magnesia bricks. Unfired magnesia bricks are further divided into chemically bonded magnesia bricks and asphalt-bonded magnesia bricks.
The refractoriness of magnesia bricks can reach above 2000℃, and its load softening temperature varies greatly with the melting point of the cementing phase and the amount of liquid phase produced at high temperatures. The thermal conductivity of magnesia bricks is relatively high, second only to carbon bricks and silicon carbide bricks in refractory products, and it decreases with increasing temperature. The thermal shock resistance of magnesia bricks is poor, and increasing the purity of magnesia bricks can appropriately improve the thermal shock resistance. Magnesia bricks have poor resistance to acidic slag, and cannot be directly in contact with silica bricks when used. Generally, they must be separated by neutral bricks. The conductivity of magnesia bricks at room temperature is very low, but it cannot be ignored at high temperatures (such as 1500℃). If used in the bottom of an electric furnace, attention should be paid.
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