Precautions for Using Silicon Carbide Rods in Different Atmospheric Environments
2026-04-22
The service life of silicon-carbide rods is closely related to the furnace atmosphere. Zhengzhou Runda provides a detailed explanation of the key operating points and protective measures for use under different atmospheres.
I. Oxidizing Atmosphere (Air, Most Common)
• Applicable: Under normal use, a SiO₂ protective film forms on the surface, providing oxidation resistance and stability.
• Temperature: ≤1450℃ for long-term safety
• Note: Ensure adequate ventilation to prevent localized oxygen deficiency.
II. Reducing Atmosphere (H₂, CO)
• Hazards: Degrades the SiO₂ film, accelerates corrosion and embrittlement, and significantly shortens service life.
• Measures:
◦ Select coated, protected silicon carbide rods (e.g., Si₃N₄)
◦ Temperature control ≤ 1250℃
◦ Pure atmosphere, reduced impurities
III. Vacuum Environment
• Issue: SiC decomposes at high temperatures, leading to a sharp decline in lifespan.
• Recommendation:
◦ Vacuum ≤ 1300℃
◦ Uses dedicated vacuum-grade silicon carbide rods
◦ The degree of vacuum should not be too high.
IV. Corrosive Atmosphere
• Prohibited contact: alkali metals, alkalis, borides, sulfides, and chlorine gas.
• Impact: High-temperature corrosion of the rod, leading to rapid failure.
• Protection: Sealed isolation; selection of corrosion-resistant coated components
V. Water Vapor Environment
• Hazard: Reacts with SiC at high temperatures, accelerating aging.
• Measures: Pre-dry the workpiece; ensure the furnace is sealed to prevent moisture ingress; and perform thorough baking.
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2025-10-14
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