Operating Procedures and Key Points for Temperature Rise Control in Silicon Carbide Rod Furnaces
2026-04-22
Proper usage and precise temperature control are critical for extending the service life of silicon carbide rods and ensuring process stability. Drawing on years of manufacturing and application experience, Zhengzhou Runda has issued operating guidelines for the use of silicon carbide rods.
I. First Use and Kiln Drying
1. New furnaces and long-idled furnaces must be baked out.
Recommended heating curve: Room temperature → 500°C (hold for 2 hours) → 800°C (hold for 2 hours) → 1200°C (hold for 1 hour)
Avoid rapid temperature rise to prevent thermal stress-induced fracture.
2. Initial Power Supply
Begin with 30% of the rated voltage and increase the voltage gradually; full-load inrush energization is strictly prohibited.
II. Normal Operating Temperature Control
• Long-term safe operating temperature ≤ 1400℃
• Surface load control:
◦ Below 1000℃: 4–6 W/cm²
◦ Around 1200℃: 2–4 W/cm²
◦ Above 1350℃: ≤1.5 W/cm²
III. Resistor Aging and Power Compensation
Silicon carbide rods undergo oxidation during use, causing their resistance to increase gradually (aging).
• When the resistance increases to 1.5 times its initial value: increase voltage compensation.
• Up to 2.5 times: It is recommended to adjust the wiring or replace it.
• More than 4 times: Must be replaced
IV. Contraindications for Daily Use
• Avoid sudden temperature changes
• Frequent start-stop operations under load are prohibited.
• The furnace atmosphere must be kept dry; the presence of large amounts of water vapor, hydrogen, or alkali metal vapors is prohibited.
Zhengzhou Runda recommends equipping the system with a dedicated pressure-regulating and temperature-control unit, which can effectively stabilize furnace temperature, slow down aging, and extend service life.
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