To avoid cracking of molybdenum crucible due to thermal shock, the following measures can be taken:
Slow heating and cooling:
Before use, avoid placing the cold crucible directly into the high-temperature furnace. You can adopt a gradual heating method. Generally, a temperature increases rate of 5-10°C per minute is recommended, especially for the first use of the crucible.
Similarly, sudden cooling should be avoided when cooling, and the temperature should be lowered slowly to ensure uniform temperature distribution.
Preheating the molybdenum crucible:
using the molybdenum crucible, it can be gradually heated to the required temperature, which can reduce the thermal stress caused by the temperature difference.
Use an inert atmosphere or vacuum:
molybdenum crucibles in an inert atmosphere (such as argon, helium) or in a vacuum environment not only reduces the risk of oxidation, but also maintains a uniform temperature, thereby reducing the risk of thermal shock.
Proper thermal insulation:
In some high temperature operations, it may be necessary to protect the outer surface of the molybdenum crucible, such as using a ceramic or quartz container as an outer layer protection to prevent it from being directly exposed to an environment with extreme temperature differences.
Avoid rapid cooling:
After the experiment, the molybdenum crucible should be cooled naturally to avoid rapid cooling, which not only helps to reduce the impact of thermal shock, but also prevents cracks caused by uneven cooling.
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