Molybdenum crucibles can be used in the field of nuclear energy material processing, and they have irreplaceable advantages in some key links. The following is a detailed analysis of molybdenum crucibles used in nuclear energy material processing:
1. Basis of nuclear applicability of molybdenum materials
1. High melting point, excellent thermal stability
Molybdenum has a melting point of up to 2620°C and can work stably for a long time in the high-temperature processing environment of nuclear energy systems (such as smelting of metals such as uranium and thorium or sintering of fuel).
2. Good neutron performance
Molybdenum has a low thermal neutron absorption cross-section (about 2.7 barns) and does not significantly interfere with neutron flux or neutron economy, making it particularly suitable for use in non-fuel structural components or containers.
3. Excellent radiation resistance
It is not prone to embrittlement or significant expansion under neutron irradiation and can withstand the effects of exposure to nuclear reactors and radioactive environments for a long time.
2. Application scenarios of molybdenum crucibles in nuclear material processing
1. Smelting and purification of metals such as uranium and thorium
Molybdenum crucibles are used for uranium metal reduction, distillation purification, alloying and other processes under high temperature conditions;
Molybdenum does not easily react with molten metals and can effectively maintain the high purity of fuel materials.
2. High temperature sintering of fuel particles
nuclear fuel particles (such as UO₂, PuO₂, MOX fuel) are sintered in a hydrogen or argon atmosphere, the molybdenum crucible can provide a high-temperature, high-cleanliness, and non-reactive pollution working environment.
3. High temperature containers in nuclear waste treatment
When processing nuclear waste (such as converting high-level radioactive waste into ceramic/glass state), molybdenum crucible can be used as a high-temperature sintering or melting reaction vessel;
It is beneficial to improve processing efficiency and reduce residue.
Precautions
It must be used in an inert atmosphere or vacuum: Molybdenum is easily oxidized at high temperatures, and nuclear fuel processing is generally carried out in a reducing or vacuum environment, so it has good adaptability.
molybdenum at high temperatures and damage the crucible.
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