Factors determining the wear resistance of refractory bricks
Release time:
2018-10-23
The factors that determine the wear resistance of refractory bricks are widely used in many projects. Refractory bricks are also inlaid in the pit. Refractory bricks must not only meet the requirements.
The factors that determine the wear resistance of refractory bricks are widely used in many projects. Refractory bricks are also inlaid in the pit. Refractory bricks must not only meet the requirements of fire resistance and high temperature resistance, but also meet the requirements of wear resistance.
The wear resistance of refractory bricks is related to temperature. Some refractory bricks, such as high alumina bricks, are generally believed that at a certain temperature (such as within the elastic range of 700~900 ℃), the higher the temperature, the lower the wear resistance. It can be considered that when the temperature increases, the wear resistance decreases with the increase of the elastic modulus of the refractory brick. When the temperature increases and reaches the maximum value of elastic modulus, the wear resistance increases with the decrease of elastic modulus. Such as clay brick in 1200~1350 ℃, wear resistance is even better than normal temperature. When the temperature is further increased, up to 1400 degrees Celsius, the liquid phase viscosity in the refractory products decreases sharply, and the wear resistance decreases. Some refractory bricks, such as chromium-containing refractory bricks, increase with increasing temperature, wear resistance.
The wear resistance of refractory bricks depends on the composition and structure of refractory bricks. When the composition of refractory bricks is a dense polycrystal composed of a single crystal, its wear resistance mainly depends on the hardness of the mineral crystals that make up the material. High hardness, high wear resistance of the material. When the mineral crystal is non-directional, the grain is small and the wear resistance of the material is high. When the material is composed of multiple phases, its wear resistance is directly related to the bulk density or porosity of the material, and is also related to the bonding strength between the components. Therefore, in the case of a certain refractory brick at room temperature, its wear resistance is proportional to its compressive strength, and the wear resistance of a well-sintered refractory brick is also better. The composition and structure of refractory bricks, and temperature will affect their wear resistance, so that the wear resistance of refractory bricks will be more excellent!
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