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Molybdenum rods exhibit excellent performance in high-temperature environments, making them widely used in various industrial applications, including heating elements for high-temperature furnaces and tube furnaces. However, in order to ensure the safe and effective use of molybdenum rods, we need to understand their potential risks and precautions.

Firstly, when the molybdenum rod is used for the first time, its resistance will increase sharply with the increase of temperature, so it will consume a large amount of current in the initial stage. To avoid damage to the equipment caused by excessive current, it is recommended to start with a lower voltage. The starting current should be controlled between 25% -30% of the normal working voltage and ensure that it does not exceed 300A. Within 15 minutes after startup, gradually adjust to the normal working voltage.

Secondly, when using molybdenum rods, it is necessary to regularly check whether the fixtures are clamped and whether the wires are loose to prevent component damage or other safety hazards. In addition, it is advisable to avoid frequent use of molybdenum rods at temperatures below 800 ℃, as repeated heating and cooling of the electric furnace can cause frequent expansion and contraction of the molybdenum rods, which may lead to the detachment of the silicon dioxide protective film and affect the service life of the molybdenum rods.

1. Handle with care: Avoid dropping or roughly handling the rods to prevent damage.
2. Wear appropriate protective gear: This includes gloves and eye protection.
3. Understand heat properties: Be aware of its heat conductivity and resistance to avoid burns.
4. Keep away from flammable materials: To prevent fires.
5. Follow manufacturer’s instructions: This is crucial for safe usage.
6. Check for damage before use: Any cracks or defects could lead to problems.
7. Use in a well-ventilated area: To avoid exposure to harmful fumes.
8. Avoid exposure to moisture or corrosive substances: Which can damage the rod.
9. Store properly: Keep them in a dry, safe place.
10. Be cautious when cutting or shaping: Use the proper tools and techniques.
11. Have a fire extinguisher nearby: In case of a fire emergency.

It is worth noting that molybdenum rods are different from silicon carbon rods in that they do not age during use, so new and old molybdenum rods can be used together. However, if the molybdenum rod is used in a hydrogen atmosphere, the silicon dioxide protective film may undergo a reduction reaction and be damaged. Therefore, after use in a hydrogen atmosphere, it should be heated in an air atmosphere at 1500 ℃ for one hour to regenerate the silicon dioxide protective film.

During the operation, attention should also be paid to the maximum operating temperature of the silicon molybdenum rod and the cold and hot impact on the silicon molybdenum rod during operation, to avoid overloading and prevent damage to the silicon molybdenum rod. After the work is completed, the silicon molybdenum rod should be cleaned and maintained in a timely manner, residual substances attached to its surface should be removed, and it should be placed in a dry location for proper storage.

Overall, understanding and following these precautions is key to ensuring the safe use of molybdenum rods. Through proper operation and maintenance, we can maximize the service life of molybdenum rods, reduce maintenance costs, and ensure the smooth progress of industrial processes.