Refractories are generally divided into two types, namely unshaped refractories and shaped refractories. Unshaped refractories are also called castables, which are mixed powder particles composed of a variety of aggregates or aggregates and one or more binders. When used, they need to be mixed with one or more liquids and mixed evenly. Strong liquidity. Shaped refractory materials generally refer to refractory bricks, the shape of which has standard rules, and it can also be temporarily processed as needed when building and cutting.
The abrasion resistance of refractory bricks depends on the composition and structure of the refractory bricks. When the composition of the refractory bricks is a dense polycrystal composed of a single crystal, its abrasion 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 crystals are non-isotropic, the crystal grains are fine 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, for a certain type of refractory brick at room temperature, its abrasion resistance is proportional to its compressive strength. When the refractory brick manufacturer considers the above factors when sintering the refractory brick, the abrasion resistance of the refractory brick produced is also better. In addition, the wear resistance of refractory bricks is related to the temperature during use. Some refractory bricks, such as high alumina bricks, are generally considered to be at a certain temperature (such as within the elastic range of 700～900℃), the higher the temperature, the higher the temperature. The lower the resistance, it can be considered that when the temperature increases, as the elastic modulus of the refractory brick increases, the wear resistance decreases.
The public welfare nature of refractory raw materials mainly depends on the mineral composition and particle composition of the raw materials, and is closely related to the manufacturing process of refractory materials. Such properties mainly include particle size and particle size distribution, fineness and specific surface area, plasticity and bonding, drying shrinkage and firing shrinkage, sintering temperature and sintering range, etc.
