Refractory bricks are generally made at room temperature and used at high temperatures. Therefore, refractory bricks with high wear resistance requirements usually refer to high temperature wear resistance. For the study of wear resistance, we can start with the strength of refractory bricks. The increase in strength will inevitably increase the wear resistance. When refractory bricks are used in high-temperature environments, they are often scoured by high-temperature gases and high-temperature particles. For cement kiln refractory bricks where high-temperature wear is severe, the wear resistance of refractory bricks is very high. As a Refractory Material Supplier, share it with you.
The influencing factors of abrasion resistance are more complicated, because the internal structure and phase of the refractory bricks are also constantly changing in a continuous and frequent high temperature environment, and the working parts with higher wear resistance requirements are often affected. Effects such as erosion and thermal shock. Therefore, considering the improvement of the high temperature wear resistance of refractory bricks requires a comprehensive range of factors. Generally speaking, the high temperature wear resistance is mainly related to the high temperature strength of the material, the liquid content and viscosity, the critical particle size and the high temperature performance of the raw materials.
At this stage, people have also proposed some measures to improve wear resistance:
(1) Choose raw materials that meet abrasion resistance
The wear resistance mechanism of refractory bricks is related to the service temperature. Before refractory bricks produce a liquid phase with higher viscosity at low temperatures, the wear is mainly reflected in the matrix part. At this time, the bonding strength of the matrix determines the wear resistance of the refractory bricks. When the material produces a liquid phase and the viscosity is large, the matrix will have a certain degree of elasticity when it is worn. If the particles are brittle at this temperature, the particles will be severely worn [30]. Therefore, according to the use environment of the material, a reasonable selection of raw materials is of great significance to the wear resistance of refractory bricks.
(2) Reasonable particle size composition
Reasonable particle size distribution is the prerequisite for the densification of refractory bricks. With the same raw materials and preparation technology, the denser the refractory bricks, the higher the strength. The higher the bonding strength between the matrix and the matrix and the aggregate, the higher the wear resistance of the refractory brick. The stronger. Therefore, the configuration of different sizes of raw materials has an important influence on the high temperature wear resistance of refractory bricks.
In addition, the choice of critical particle size also has a greater impact on the high temperature wear resistance of the castable. -Large particles of fixed size can produce a "shadow effect" when the matrix is worn, thereby reducing the amount of matrix wear and improving the wear resistance of refractory bricks. Therefore, reasonably increase the critical particle size of refractory brick raw materials
It can also improve the abrasion resistance of refractory bricks to a certain extent.
(3) Improve the strength of refractory bricks
The wear resistance of abrasion-resistant refractory bricks is directly related to their strength. The higher the strength at high temperatures, the higher the bonding strength between the matrix and aggregates of the refractory bricks. If there are too many defects and cracks in the microstructure at high temperatures, The strength of the material will decrease, and the amount of wear will increase accordingly. Therefore, how to improve the strength of the castable at high temperature is one of the important ways to solve the high temperature wear resistance.
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