Sintered molybdenum crucible is a kind of molybdenum crucible manufactured by powder metallurgy sintering process, which is widely used in high temperature industry and scientific research. The following is a brief description of its definition, characteristics, manufacturing process and application:
- Definition
Sintered molybdenum crucible is made of high-purity molybdenum powder (purity is usually ≥99.95%) as raw material, through pressing and high-temperature sintering process. Its main feature is that the solid structure is formed by the combination of powder particles at high temperature, which is suitable for high-temperature processes in vacuum, inert or reducing atmosphere.
- Manufacturing Process
Sintered molybdenum crucible includes the following key steps:
Molybdenum powder preparation: Use high-purity molybdenum powder, sieve to ensure uniform particle size, and add a small amount of binder (such as polyvinyl alcohol) if necessary.
Pressing: Molybdenum powder is loaded into a mold and pressed into a crucible green body by a hydraulic press (100-300 MPa) or cold isostatic pressing (CIP).
Pre-sintering: Low temperature sintering at 800-1200°C in vacuum or hydrogen atmosphere to remove binder and moisture.
High temperature sintering: sintering in a vacuum or hydrogen furnace at 1800-2200°C for 2-6 hours to combine the molybdenum powder particles and the crucible density reaches 90-95% of the theoretical density (~10.2 g/cm³).
Finishing: Adjust the size and surface finish by turning, grinding or polishing, and apply an anti-oxidation coating if necessary.
Quality inspection: Check size, density, microstructure and defects (such as cracks, pores).
- Features
advantage:
Lower cost: Compared with forging or spinning, sintering process is suitable for mass production and has high material utilization rate.
Flexible shape: complex shapes and large crucibles can be manufactured, and the mold design is flexible.
High temperature performance: withstands 1700-2000°C in vacuum/inert atmosphere, good chemical stability.
Limitations:
Slightly lower density: usually 90-95% theoretical density, mechanical strength and durability are slightly lower than forged crucibles.
Rough surface: The surface may not be smooth enough after sintering and requires additional processing.
High temperature oxidation: It is easy to oxidize in an oxygen-containing environment (> 500°C) to generate volatile MoO ₃, and an oxidizing atmosphere should be avoided.
- Application
Sintered molybdenum crucibles are widely used in the following fields due to their cost-effectiveness and high temperature performance:
Metallurgical industry: smelting rare metals (such as tungsten and tantalum), precious metals (such as gold and silver) or alloys.
Glass/ceramic industry: high temperature melting of special glass or sintering of ceramics.
Laboratory research: for high temperature experiments, material heat treatment or sintering processes.
Others: Powder metallurgy, vacuum heat treatment and other scenarios that require high-temperature corrosion-resistant containers.
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