Molybdenum Alloy Crucible is a high-performance alloy crucible made of molybdenum (Mo) as the base metal and other metal elements (such as titanium Ti, zirconium Zr, hafnium Hf, tungsten W, lanthanum La, rare earth elements, etc.). Compared with pure molybdenum crucibles, molybdenum alloy crucibles have better mechanical strength, high temperature resistance, oxidation resistance and thermal shock stability, and are often used in high-temperature smelting, single crystal growth, rare earth purification and other fields under extreme conditions.
- Definition and Characteristics
High melting point: The melting point of molybdenum is as high as 2610℃. Molybdenum alloy crucible can be used for a long time in a high temperature environment above 2000℃, and is suitable for ultra- high temperature material processing.
Corrosion resistance: It has excellent corrosion resistance to molten metals (such as titanium, zirconium, hafnium, etc.) and strong acids and alkalis, and avoids the introduction of impurities.
Low thermal expansion coefficient: Low thermal expansion coefficient (about 4.8×10 ⁻⁶ / ℃), good dimensional stability at high temperatures, and reduced risk of cracking caused by thermal stress.
High strength and creep resistance: The mechanical properties are enhanced by alloying, making it suitable for high load and long-term high temperature conditions.
- Manufacturing process
Powder metallurgy method: Molybdenum powder is mixed with alloy element powder, pressed and sintered into shape, and then mechanically processed (such as turning and spinning) to achieve precision requirements.
Isostatic pressing: Isostatic pressing technology is used to improve density, reduce internal defects and enhance deformation resistance.
Precision machining: Crucibles of different shapes (such as round bottom, conical, elliptical mouth) and sizes can be customized according to application requirements, and the surface finish can reach Ra1.6.
- Application fields
Metallurgical industry: used for smelting and casting of rare metals (titanium, zirconium, hafnium) to ensure high purity of alloy components.
Semiconductor industry: In the growth of sapphire (Al₂O₃) and yttrium aluminum garnet (YAG) single crystals, it serves as the core container for the Czochralski growth method to avoid thermal stress cracking and contamination of the crystals.
Nuclear energy field: used for nuclear fuel post-processing, containing molten uranium and plutonium alloys, with excellent resistance to neutron radiation damage.
Aerospace: Preparation of tungsten-copper composite materials for rocket nozzles, achieving high density (≥98%) through powder metallurgy sintering process.
Optical and laser technology: When melting optical glass and laser glass, it can effectively block corrosion from silicate melt and improve light transmittance (for example, the light transmittance of phosphate laser glass can reach 99.6%).
- Technical advantages
Adaptability to vacuum environment: In the vacuum arc melting (VAR) process, the thermal fatigue resistance is better than that of graphite crucible, which prolongs the service life of the equipment.
Application of coating process: In the research and development of perovskite solar cells, it is used for vacuum evaporation of hole transport layer materials, with a temperature control accuracy of ±2°C to ensure uniformity of film thickness.
Anti-pollution performance: In the preparation of LED substrate materials, maintain surface smoothness and ensure that the crystal dislocation density is less than 10³/cm².
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