During the engineering construction, selection, use and daily maintenance of refractory castables, many companies often encounter various difficult problems. In order to help users avoid construction misunderstandings, standardize usage procedures, and ensure construction quality, we have compiled 10 of the most popular questions about refractory castables and provided professional, detailed and standardized answers.

In the process of daily technical docking, customer consultation and kiln maintenance, we have collected a large number of common questions about clay bricks that users are concerned about. Most purchasing and construction personnel have questions about the temperature parameters, adaptable working conditions, service life, and selection differences of clay bricks. This article compiles 10 frequently asked questions about clay bricks in the industry and provides unified answers using factory practical experience to help everyone thoroughly understand the key points of clay brick selection and use.

The main crystal phase of mullite bricks is mullite (3Al₂O₃·2SiO₂). However, ordinary high alumina bricks only have alumina content that meets the standard, and their crystal phase is usually composed of a mixture of corundum, mullite and glass. In actual use, mullite bricks have significant advantages in thermal shock resistance and creep resistance. They have better volume stability under high temperature environments and are less prone to deformation and cracking problems.

Features of refractory prefabricated parts: 1. Can meet the needs of high-temperature industrial kilns. The parts to be constructed cannot be constructed with refractory bricks and castables, and prefabricated parts can be used. 2. When refractory bricks cannot be made due to factors such as weight, volume, size, etc. of the construction site, refractory prefabricated parts can be used. 3. The refractory prefabricated parts are integrally cast with refractory castables specially formulated according to customer requirements. They have the advantages of high temperature resistance, corrosion resistance, wear resistance, high strength, and good thermal shock stability. They can fully meet the use environment and conditions required by customers.

Construction should be carried out indoors during rainy days. All materials, transport, work sites and masonry must be protected from rain. Unfinished projects must be roofed, holes and leaks plugged, the upper opening of the completed furnace must be closed, and the completed floor prefabricated parts must be raised and covered, and immersion in water is strictly prohibited. When the ambient temperature is greater than 30℃, summer construction can be considered. During construction in summer, the water temperature and material temperature should be controlled below 30°C. Materials exposed to the scorching sun should be cooled down before use. When constructing castables in summer, try to arrange it in the morning or evening. After pouring, it should be covered with a curtain in time, and water should be sprinkled to cool down. The reasons for the following problems after the construction of refractory castables: 1. Peeling: generally caused by the formwork being too dry or the surface slag cleaning being incomplete. 2. Pockmarked noodles: caused by uneven mixing or improper treatment of the template surface. 3. Honeycomb: caused by poor vibration or uneven dryness and wetness of the material. 4. Holes: caused by leakage vibration. 5. Too much water in small micropores:

Refractory castables are attracting more and more attention from customers, but they are often affected by the ambient temperature during use and undergo drastic changes. The thermal shock resistance of the castables reflects its value. Its thermal shock resistance is an important indicator for measuring the breakage resistance of the castables. It is the ability to counteract the loss caused by rapid changes in temperature during the use of the castables.