- Time:Aug 22, 2023
Abrasion of refractories refers to the gradual loss of the original structure and performance of the refractory surface due to factors such as external force or chemical action during use. Here are some common causes of refractory wear:
1. Mechanical wear: Mechanical wear is caused by mechanical effects such as material flow, friction and impact. For example, in a high temperature environment, the surface of refractory bricks may be impacted and rubbed by solid particles, which will gradually wear away. In addition, mechanical vibration and shock may also cause wear of refractory materials.
2. Erosion wear: Under certain application conditions, especially in high-temperature processes such as metallurgy and glass industries, refractory materials may directly contact molten metal or glass liquid, resulting in erosion. This erosive action results in gradual dissolution, erosion and wear of the refractory surface.
3. Chemical attack: Certain gases and chemicals chemically react with refractory materials at high temperatures, resulting in erosion and wear of the material. For example, acidic gases such as acid mist or basic gases such as water vapor can react with the compounds in the refractory, causing its destruction.
4. Thermal Stress Wear: At high temperatures, materials experience stress due to thermal expansion and contraction. If these stresses exceed the capacity of the refractory material, they can cause the material to crack, spall or crack, causing wear.
5. Cyclic Thermal Shock: Cyclic thermal shock is the thermal stress caused by temperature changes during the continuous cooling and heating cycles of refractory materials. This cyclical thermal shock can lead to cracking and failure of the refractory, eventually causing wear.
6. Oxidation-reduction reaction: In some special environments, refractory materials may react with oxidants or reductants in the atmosphere. This chemical reaction leads to structural changes, shedding and wear of the material.
The degree of refractory wear depends on the nature of the material, the conditions of use, the way of operation and the application environment and other factors. In order to prolong the life of refractory materials, some measures can be taken, such as reasonable selection of refractory materials, optimization of operation methods, regular maintenance and repairs, etc. At the same time, according to the specific situation, material improvement and process optimization can also be carried out to improve the wear resistance and service life of refractory materials.
