In the process of building refractory bricks, refractory motar is usually used for building, and refractory cement cannot be used for building. Although both are refractory materials, there are great differences in the actual application process.
Refractory mud, also known as fire mud or joint material, is a joint material specially used for refractory brick building. It is composed of refractory powder and admixtures. It has good plasticity, convenient construction, high bonding strength, strong corrosion resistance, and high refractoriness. Refractory cement, also known as aluminate cement or high alumina cement, is a necessary material for preparing refractory castables. It is usually used for bonding between powders in refractory castables, and can also harden refractory castables.
The main reasons why refractory cement cannot be used for building refractory bricks are as follows:
1. Differences in bonding and hardening methods between refractory mud and refractory cement. Refractory mud has good plasticity and bonding properties, can form ceramic bonding at high temperatures, and provide sufficient strength and stability. Refractory material cement has different bonding properties compared to refractory mud, and its hardening method is also different from that of refractory mud. Refractories cement is usually a hydraulic cementing material. 2. The construction methods of refractory mud and cement are different. When laying refractory bricks, refractory mud is usually constructed by wet method to ensure the close bonding between bricks. Refractories cement is usually used for on-site construction by prefabricated parts or on-site pouring.
3. There are differences in chemical properties. The performance of refractory mud at high temperature, such as thermal stability and slag resistance, is more suitable as a joint material for masonry. Although refractory cement also has high temperature performance, its thermal expansion rate, thermal conductivity and other properties may not be suitable for direct use as a joint material for masonry refractory bricks.
4. There are differences in use. The selection of refractory mud should match the use temperature of the use part. For example, high-alumina bricks are recommended to use high-alumina refractory mud, while clay bricks use clay refractory mud. The aluminum content in refractories cement is higher, and it is more used as a high-temperature adhesive to prepare refractory castables.
This is why refractory cement cannot be used to build refractory bricks. Although refractories cement and refractory mud both have relatively high aluminum content, the main reason lies in the differences in bonding and hardening methods, which lead to differences in the use of the two.
