Precautions for Using Silicon-Molybdenum Rods:
2026-04-10
1. Temperature range limitations: Silicon-molybdenum rod heating elements should not be used in the temperature range of 400°C to 700°C, as low-temperature oxidation occurs within this range, leading to component failure.
2. Atmospheric Compatibility: Silicon-molybdenum rods are suitable for use in air and neutral atmospheres. Reducing atmospheres can degrade the protective layer, while chlorine and sulfur vapors can directly damage the components.
3. Continuous Operation: During the heating process, a silica protective layer forms on the surface of the silicon-molybdenum rod, which helps prevent further oxidation. Therefore, it is recommended that the silicon-molybdenum rod be operated continuously to maximize its service life.
4. Distance from the Hot End: The hot end of the silicon-molybdenum rod should be kept at a specified distance from the kiln wall to prevent damage to the wall or breakage of the rod.
5. Terminal Clamp: The terminal clamp for the silicon-molybdenum rod should be tightened as much as possible to ensure full contact with the aluminum-sprayed cold-end section and to prevent arcing.
6. Low-voltage startup: When silicon-molybdenum rods are first put into service, their resistance increases sharply as the temperature rises. Therefore, it is recommended to start up at a low voltage—specifically, 25% to 30% of the normal operating voltage—with a starting current not exceeding 300 A. After 15 minutes, the system may be switched to the normal operating voltage.
7. Inspect fixtures and wiring: Regularly check that fixtures are securely clamped and that wiring is not loose to prevent component damage or other safety hazards.
8. Avoid frequent operation below 800°C: Repeated heating and cooling of the electric furnace causes the silicon-molybdenum rod to expand and contract repeatedly, leading to the spalling of the silica protective layer; therefore, it should not be operated frequently at temperatures below 800°C.
9. Regeneration of the silica protective film: After use in a hydrogen atmosphere, the silica protective film on the surface of the silicon–molybdenum rod should be heated in an air atmosphere to 1500°C for one hour to regenerate it.
Observing these precautions will ensure the efficient and safe operation of silicon-molybdenum rod heating elements.
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2025-10-14
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