Overview
Recrystallized silicon carbide (R-SiC) is a premium-grade ceramic synthesized by sintering silicon carbide particles at temperatures above 2,200°C without binders. This process induces grain growth and recrystallization, resulting in a porous yet mechanically robust structure. Unlike reaction-bonded SiC, R-SiC contains minimal free silicon, enhancing its high-temperature stability. R-SiC is favored in industries requiring materials that withstand thermal cycling, corrosive environments, and mechanical stress. Its self-bonding microstructure eliminates the need for secondary phases, making it suitable for applications where purity and thermal performance are critical.
Physical and Chemical Properties
R-SiC exhibits a unique combination of properties: thermal conductivity of 120–180 W/m·K (at 20°C), flexural strength of 100–150 MPa, and a coefficient of thermal expansion of 4.5 × 10⁻⁶/K. Its open porosity (typically 12–20%) allows gas permeability while maintaining structural integrity. Chemically, R-SiC is inert to most acids, molten metals, and oxidizing atmospheres up to 1,600°C. However, it reacts with hydrofluoric acid and strong alkalis at elevated temperatures. The material’s hardness rivals diamond, making it ideal for abrasive and wear-resistant uses.
Main Applications
R-SiC dominates high-temperature industrial applications. In kiln furniture, it serves as saggers and setters for ceramic firing due to its low thermal mass and resistance to warping. Heat exchangers and radiant tubes in chemical plants leverage its thermal conductivity and corrosion resistance. Other uses include burner nozzles for clean combustion, thermocouple protection sheaths, and components in semiconductor manufacturing. Its wear resistance also makes it suitable for shot blast nozzles and pump seals in harsh environments.
Safety and Storage
While R-SiC is non-toxic, machining generates fine dust that requires NIOSH-approved respirators and proper ventilation. Finished products are stable under normal conditions but should be stored in dry environments to prevent moisture absorption in porous grades. High-temperature use demands gradual heating to avoid thermal shock, despite the material’s inherent resistance. Avoid direct contact with hydrofluoric acid or caustic solutions to prevent surface degradation.
B2B Procurement Guide
When sourcing R-SiC, specify the following: porosity (affects thermal and mechanical properties), dimensions (custom shapes are common), and purity (industrial-grade vs. high-purity for semiconductors). Bulk orders (100+ kg) often qualify for discounts. Verify supplier certifications like ISO 9001 and request test reports for density, porosity, and thermal conductivity. Lead times vary from 4–12 weeks for custom components. Consider regional suppliers to reduce logistics costs for heavy or fragile items.
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