Industry Knowledge of Silicon Carbide Refractory Castables

Silicon carbide (SiC) refractory castables are widely used in the ceramic, metallurgy, and coke industries as lining materials due to their excellent performance under high temperature and corrosive atmospheres. The article explains the classification, technical parameters, and production process of SiC refractory castables, which are important industrial knowledge.

SiC refractory castables are classified into four main grades based on the crystal size of SiC, including microcrystalline SiC, small-grain SiC, medium-grain SiC, and large-grain SiC. Different grades have different microstructures and properties, which affect their suitability for specific applications.

The technical parameters of SiC refractory castables include bulk density, apparent porosity, compressive strength, flexural strength, thermal conductivity, and refractoriness. Bulk density and apparent porosity are critical parameters that determine the ability of the material to resist thermal shock and mechanical wear. The compressive and flexural strengths are important parameters that affect the resistance of the castables to mechanical impact and load. The thermal conductivity is closely related to the efficiency of heat transfer, while refractoriness determines the maximum service temperature.

The production process of SiC refractory castables involves several steps, including preparation of raw materials, mixing, shaping, and curing. The raw materials mainly include SiC, binder, and various additives, such as plasticizers, stabilizers, and deflocculants. The production process can be divided into dry and wet methods based on the mixing method. The dry method involves mixing the ingredients in a dry state, while the wet method involves adding a liquid to the mixture. The mixture is then shaped into the desired shape, either by vibration or by casting. The curing process is essential for optimizing the properties of the castables and can occur through drying at low temperatures or through heating.

In conclusion, SiC refractory castables are a critical component in many high-temperature industrial applications. Their classification, technical parameters, and production process are important knowledge for professionals in the industry. However, continuous research and development are necessary to improve the properties and performance of SiC refractory castables, ensuring their widespread use and contribution to the industry.