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The material of firebrick is the key that decides wearability

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The material of firebrick is the key that decides wearability

Date of release:2018-07-17 Author: Click:

The composition and internal structure of refractory brick determine its wear resistance. When the material is a compact polycrystal composed of a single crystal, the hardness of the mineral crystal itself determines its wear resistance. The high wear resistance of the material indicates the high hardness of the crystal. When the crystal is non-isotropic, the internal grain is fine and the material has a high wear resistance. And when the material is composed of many directions, the volume, density, porosity and the bonding strength of each part of the material itself determine the wearability of the refractory brick.


 

 

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Therefore, for a certain kind of firebrick at room temperature, its wear resistance is proportional to its compressive strength, sintered products of good wear resistance is also better. The wear resistance of refractory is related to temperature. Some materials such as silicon aluminum refractory products, it is generally believed it under a certain temperature, such as in the 700 ~ 900 ℃ under elastic range, the higher the temperature lower abrasion resistance, can be thought as temperature increase with the increase of elastic modulus, abrasion resistance has decreased.



When the temperature rises to the maximum value of the elastic modulus, the wear resistance increases with the decrease of the elastic modulus. Such as aluminum silicate refractory products during 1200 ~ 1350 ℃, temperature wear resistance or even better than often. When the temperature further increase, more than 1400 ℃, due to the liquid viscosity of refractory products sharply reduced, wear resistance decreases. Some firebrick if contain chromic qualitative product, rise as the temperature, wearability increases. The abrasion resistance of firebrick is its ability to resist the mechanical wear of solid, liquid and dusty airflow on its surface.



In many cases, the damage caused by mechanical wear on the surface of refractory brick is usually very serious. It is often the direct cause of the loss of refractory bricks by their working surfaces. Sometimes it is more harmful than chemical erosion, or the damage caused by chemical erosion is often exacerbated by mechanical action. For example, the inner lining of firebrick and iron ditch in the upper part of blast furnace are often worn out due to insufficient wear resistance. Coke oven carbonization chamber refractory brick is also vulnerable to coke wear, steelmaking converter furnace mouth, steel outlet and other by airflow erosion and all kinds of molten liquid through the place, often due to poor wear resistance material loss. Therefore, the wear resistance of firebrick is an important property.


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Key word:耐火砖,耐火砖材料,耐火砖工厂

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