Black silicon carbide (SiC) powder is widely used as a refractory material due to its exceptional thermal, mechanical, and chemical properties. Here’s how it functions in refractory applications:
Key Properties Making Black SiC Suitable for Refractories:
High Thermal Resistance
Withstands temperatures up to 1,600°C in oxidizing environments and 2,200°C in inert/reducing atmospheres.
Low thermal expansion coefficient reduces cracking under thermal cycling.
Excellent Mechanical Strength
High hardness (~9.5 Mohs) improves abrasion resistance in refractory linings.
Enhances structural integrity in harsh environments (e.g., furnaces, kilns).
Superior Chemical Stability
Resists corrosion from acids, alkalis, and molten metals (e.g., aluminum, copper).
Minimal reaction with slags and fluxes in metallurgical processes.
High Thermal Conductivity
Improves heat distribution in refractory components, reducing thermal stress.
Applications in Refractories:
Furnace Linings (steel, non-ferrous metal, glass industries)
Kiln Furniture (saggers, setters, beams)
Refractory Bricks & Castables (enhances durability and thermal shock resistance)
Sliding Gate Plates & Nozzles (steelmaking)
Anti-wear Coatings for high-temperature equipment
Forms of Black SiC in Refractories:
Raw Powder (mixed with binders like alumina or silica for castables).
Aggregates/Grains (for pressed or sintered refractory bricks).
Reinforcement Additive (improves strength in alumina-carbon refractories).