I. Key Characteristics
Low Thermal Conductivity
Effectively blocks heat transfer, improving energy efficiency.
Excellent Thermal Shock Resistance
Withstands rapid temperature changes without cracking or damage.
Good Erosion Resistance
Suitable for high-speed airflow or flue gas environments, offering a longer service life.
High Thermal Stability
Minimal shrinkage and stable structure in high-temperature environments, ensuring high reliability.
Low Heat Capacity
The material's specific heat capacity means it experiences minimal temperature rise itself after absorbing significant heat, aiding energy savings and reducing kiln heat-up time.
Customization Flexibility
Can be molded into various shapes using custom-designed molds, different binders, and additives to meet diverse requirements.
Surface Treatability
Supports coating with vacuum-formed hardeners or refractory cement for enhanced surface protection, adapting to more complex working conditions.
II. Density Classification & Applications
Ceramic fiber shapes are divided into two types: thermal insulation/sealing, and fire-blocking/insulation. The latter has lower thermal conductivity for better insulation and a correspondingly higher price.
Standard Density (approx. 300 kg/m³)
Offers moderate hardness and a balance of refractoriness and insulation properties, making it widely applicable.
High Density (approx. 400 kg/m³)
An extra-hard material often used inside furnace chambers for applications like fire barriers, wind baffles, and temperature zoning structures. It directly faces flame impingement and possesses stronger structural stability and erosion resistance.
III. Surface Pre-Treatment
The surface of shapes is leveled via chemical or mechanical methods for a smoother finish. In subsequent processes, the surface oxidizes, forming a dense yet porous Al₂O₃ film. Sealing this film closes its pores, significantly enhancing resistance to contamination, corrosion, and abrasion. Before sealing, the strong adsorption capacity of the oxide film can be utilized to deposit metal salts within the pores to enhance specific functionalities.
IV. Understanding Thermal Shock Resistance
Incorporating well-dispersed refractory fiber cotton during production significantly enhances the material's strength and thermal shock resistance. Crystallization on the fiber surfaces and the bridging effect of ceramic phases across interfaces effectively inhibit crack propagation within the matrix. This structure also does not hinder the dispersion and absorption of energy at the interfaces during thermal shock, allowing the material to remain intact and stable under rapid temperature changes.
