Molybdenum crucibles have extensive and critical applications in the ceramic industry, especially in the sintering and melting processes of special ceramics that require high temperatures and clean environments. The following is a detailed analysis of its application in the ceramic industry:
- Which ceramic processes are molybdenum crucibles suitable for?
- High temperature sintered ceramics
Molybdenum crucibles are commonly used in high temperature sintering processes of the following ceramic materials:
Zirconia (ZrO ₂) ceramics
Alumina (Al₂O₃) ceramics
Silicon nitride (Si₃N₄) and silicon carbide (SiC)
Aluminum Nitride (AlN)
Rare earth oxide ceramics (such as Y₂O₃, La₂O₃)
Ceramic Matrix Composites (CMC)
These ceramics are usually sintered at high temperatures (>1600°C), and molybdenum crucibles are ideal sintering containers due to their high melting point (3410°C) and chemical stability.
- Application advantages of molybdenum crucible
- High temperature stability
Molybdenum can work stably up to over 2000°C in vacuum and inert atmosphere, and is suitable for ultra-high temperature sintering or melting operations.
- High purity, avoiding ceramic contamination
molybdenum crucible materials is generally above 99.95%. It will not release impurities or gases at high temperatures like graphite or oxide crucibles, which can ensure the electrical insulation and purity of ceramic products.
- Good thermal conductivity
Molybdenum has high thermal conductivity (about 138 W/m·K), which ensures uniform heating of the ceramic material and helps the uniform growth and densification of the grains.
- High strength, not easy to deform
Even at high temperatures, molybdenum still has good mechanical strength and thermal shock resistance, is not easy to collapse or crack, and is suitable for multiple uses.
- Specific application examples
- Melting of transparent ceramics
For example, **YAG ceramics (yttrium aluminum garnet)** or MgAl ₂ O ₄ spinel ceramics need to be melted and recrystallized in a pollution-free, high-temperature environment, and the molybdenum crucible provides a stable container.
- Sintered nitride and carbide ceramics
The sintering temperature of these materials is extremely high and has strict requirements on the container material. Molybdenum crucible can withstand the sintering temperature of high-hardness ceramics such as silicon nitride and boron carbide.
- Used in vacuum or hydrogen sintering furnace
Molybdenum crucibles are widely used as firing vessels in the mass production of ceramic components (electrical insulation substrates, thermistor chips, microwave ceramics, etc.) in vacuum furnaces or reducing atmospheres (H 2).
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