Refractories are generally divided into two types, namely unshaped refractories and shaped refractories. Unshaped refractories, also called castables, are mixed powdery granules composed of multiple aggregates or aggregates and one or more binders. When used, they must be mixed with one or more liquids and stirred uniformly. Strong liquidity. Shaped refractory materials generally refer to refractory bricks, and there are standard rules for their shapes, and they can also be temporarily processed as needed.
1. Chemical composition: The main ingredients determine the quality and characteristics of the refractory
2. Bulk density: weight per unit volume, high density, indicating good compactness and strength may be high, but the thermal conductivity may be large
3. Apparent porosity: There are no specific requirements, but the manufacturer must strictly control the apparent porosity.
4. Load softening temperature: It is also called the temperature at which the high-temperature load starts to deform. This parameter is very important, indicating that the material is resistant to high temperatures.
5. Thermal shock resistance: the ability to resist rapid temperature changes without being destroyed
6, compressive strength: the ability to withstand the maximum pressure (normal temperature)
7, flexural strength: ability to withstand shear pressure
8. Linear change rate: Also called reburning line change or residual line change, refers to the change in volume expansion and contraction every time the same temperature changes. If each expansion and contraction is the same, we define such a linear change rate as 0
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