Molybdenum crucible can be used for sintering magnetic materials, which is mainly due to its high temperature resistance, chemical stability, low thermal expansion coefficient and other characteristics. The specific analysis is as follows:
- Applicability Analysis
High temperature resistance
molybdenum is as high as 2610℃. Molybdenum crucible can work stably in high temperature environment above 2000℃, meeting the sintering temperature requirements of magnetic materials (such as ferrite, NdFeB, etc.) (usually 1000℃~1500℃).
During the high-temperature sintering process, the molybdenum crucible will not melt or deform due to excessive temperature, ensuring the stability of the sintering process.
Chemical stability
Molybdenum does not react chemically with magnetic materials (such as Fe, Co, Ni, etc.) and their oxides at high temperatures, avoiding the introduction of impurities and ensuring the purity and performance of the magnetic materials.
Especially in the sintering of rare earth permanent magnet materials (such as NdFeB), the chemical inertness of molybdenum crucible can prevent the oxidation or volatilization of rare earth elements (such as Nd and Pr).
Low coefficient of thermal expansion
The thermal expansion coefficient of molybdenum (about 5.5×10 ⁻⁶ / ℃) is similar to that of magnetic materials, which reduces cracking or deformation caused by thermal stress and improves the yield rate of sintered products.
- Technical advantages
High purity guarantee
Molybdenum crucibles are made of high-purity molybdenum powder (≥99.95%) to avoid metal impurities contaminating magnetic materials and meet the purity requirements of high-end magnetic materials (such as high-performance permanent magnets).
Mechanical strength
Molybdenum crucible has high strength and hardness, can withstand the mechanical impact and pressure during the sintering process of magnetic materials, and prolong its service life.
Thermal conductivity
molybdenum (about 138 W/(m·K)) can quickly and evenly conduct heat, reduce the temperature gradient during sintering, and avoid the degradation of magnetic material performance caused by local overheating.
- Application Scenarios
Ferrite sintering
soft magnetic ferrites (such as MnZn ferrite), molybdenum crucibles can provide a stable high temperature environment to ensure the magnetic permeability and loss performance of ferrite.
Sintering of rare earth permanent magnet materials
In the sintering of rare earth permanent magnet materials such as neodymium iron boron (NdFeB), molybdenum crucible can prevent the oxidation or volatilization of rare earth elements and ensure the remanence and coercive force of the magnet.
Magnetic film preparation
In the chemical vapor deposition (CVD) of magnetic thin films (such as CoPt and FePt ), molybdenum crucibles are used as heating containers and can withstand high temperature corrosive gas environments to ensure the uniformity and purity of the films.
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