Molybdenum crucibles to a certain extent, especially in the following aspects. The following is a detailed analysis:
molybdenum crucible by nanostructure
1. Grain Refinement Strengthening
nanocrystalline molybdenum or ultrafine-crystalline molybdenum increases, effectively hindering grain boundary sliding and crack propagation;
It exhibits better thermal fatigue resistance and dimensional stability under high temperature conditions.
2. Inhibit high temperature grain growth
Traditional molybdenum tends to coarsen grains at high temperatures, which reduces strength;
Nanostructures have a stronger grain pinning effect due to higher grain boundary energy, which slows down the grain growth process;
Especially under **repeated thermal cycling** conditions, the stability is significantly improved.
3. Thermal stress dispersion mechanism
substructures in the nanostructures helps to relieve local thermal stress concentration;
Improve overall thermal shock resistance and crack resistance.
4. Improve oxide layer adhesion
Surface nano- treatment can increase the bonding strength with the anti-oxidation coating;
The coating is less likely to fall off, which improves the anti-oxidation stability and thermal isolation effect.
2. Related preparation technology
1. Nanostructured PM-Mo
The crucible is formed by pressing and sintering nano-molybdenum powder, and the grain size can be controlled at the level of hundreds of nanometers;
It is mostly used in high-end crystal growth, high-temperature heat source and other occasions;
However, the cost is high and the processing is difficult.
2. Surface nano- treatment
For example, laser shock strengthening (LSP), high-energy ball milling + hot pressing sintering, plasma spraying fine-grained coating;
Form a nanostructured surface layer to improve surface thermal stability and corrosion resistance.
3. Nanocomposite reinforcement materials
nano carbides and nitrides (such as TiC, ZrC, Si₃N₄) to the molybdenum matrix;
Forming a molybdenum -based nanocomposite crucible that combines strength, thermal conductivity, and heat resistance;
Can effectively inhibit crack initiation and propagation.
3. Application Prospects and Challenges
| Advantages | challenge |
| Significantly improved thermal stability | The preparation process is complicated and the cost is high |
| Stronger thermal shock resistance | Nanopowders are highly oxidizing and require an inert environment for preparation |
| Can be used with high performance coatings | Smaller grain size may sacrifice some high temperature creep resistance |
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