Sintered Molybdenum Crucibles
High-purity sintered molybdenum crucibles designed for thermal evaporation, sapphire crystal growth, rare-earth smelting, and high-vacuum furnace operations. Engineered using high-density powder metallurgy to prevent thermal deformation and molten metal corrosion at operating temperatures up to 1900 degrees C (3450 degrees F).
- Product Introduction
High-Purity Sintered Molybdenum Crucibles for High-Temperature Vacuum Thermal Processing
High-purity sintered molybdenum crucibles designed for thermal evaporation, sapphire crystal growth, rare-earth smelting, and high-vacuum furnace operations. Engineered using high-density powder metallurgy to prevent thermal deformation and molten metal corrosion at operating temperatures up to 1900 degrees C (3450 degrees F).
Technical Specifications
|
Parameter |
Specification |
Standard / Condition |
|
Material Purity |
Mo >= 99.95% |
ICP-MS tested (Fe, Ni, Si, O impurities total < 500 ppm) |
|
Density |
9.8 - 10.2 g/cm3 |
>= 96% of theoretical density (10.22 g/cm3) |
|
Melting Point |
2623 degrees C (4753 degrees F) |
Theoretical |
|
Max Working Temp |
1900 degrees C in vacuum / reducing atmosphere |
Avoid oxidizing environments above 400 degrees C |
|
Thermal Expansion |
4.8 x 10^-6 /K (at 20 degrees C - 1000 degrees C) |
Low thermal distortion |
|
Surface Finish |
Ra 1.6 - 3.2 um |
Machined / Fine Ground |
|
Dimensions |
OD 20 mm - 500 mm; Wall thickness 2 mm - 15 mm |
Fully customizable per technical drawing |
Key Performance Advantages
Low Gas Outgassing & High Purity (>= 99.95%) Controlled elemental impurity levels protect processed materials-such as optical coatings, semiconductors, and rare earths-from iron, nickel, and carbon contamination during high-vacuum deposition.
High Sintered Density (9.8 - 10.2 g/cm3) Cold Isostatic Pressing (CIP) followed by high-temperature hydrogen sintering yields uniform grain structures. This density reduces thermal creep, prevents thermal shock cracking during fast ramp rates, and extends service life over multiple thermal cycles.
Molten Metal & Vapor Resistance Demonstrates high corrosion resistance against non-ferrous molten metals, oxides, and glass melts where graphite or iron-based alloy containers react or fail.
Manufacturing Process & Quality Assurance
Powder Selection & Blending: Raw molybdenum powder is batch-analyzed for particle size distribution and trace impurity limits.
Cold Isostatic Pressing (CIP): Uniform multi-directional pressure eliminates internal density gradients and voids.
High-Temperature Sintering: Sintered in hydrogen furnaces above 1800 degrees C to achieve structural integrity and target density.
Precision CNC Machining: Final turning and grinding to maintain tight dimensional tolerances (standard +/-0.1 mm, or per drawing specifications).
Inspection & Certification: Every batch includes dimensional inspection reports, density testing (Archimedes method), and chemical composition analysis.
Primary Applications
Vacuum Evaporation Deposition: Crucible liners for thin-film optical coatings, electronics, and OLED manufacturing.
Crystal Growth: High-temperature vessels for sapphire monocrystal production (HEM/CZ methods).
Sintering & Smelting: Processing containers for rare-earth metals, nuclear fuels, and high-temperature technical ceramics.
Vacuum Heat Treating: Charge carriers and boats for high-vacuum induction and resistance furnaces.
Customization Capabilities
We produce molybdenum crucibles to custom engineering drawings:
Shapes: Straight cylindrical, tapered, flat-bottom, spherical-bottom, threaded, or flanged designs.
Tolerances: Standard +/-0.1 mm; critical dimensions achievable to +/-0.05 mm upon request.
Documentation: Material test certificates (EN 10204 3.1) provided with each shipment.
Frequently Asked Questions
Q: What is the maximum recommended operating temperature for your molybdenum crucibles?
A: In a vacuum or hydrogen/inert atmosphere, they safely operate at temperatures up to 1900 degrees C. For applications above 1900 degrees C, high-density forged or wrought molybdenum containers may be required depending on structural loads.
Q: Can molybdenum crucibles be used in air or oxidizing environments?
A: No. Molybdenum oxidizes rapidly in air at temperatures above 400 degrees C, forming volatile MoO3. They must be operated under vacuum (< 10^-2 Pa) or inert/reducing protective gas (Ar, He, H2).
Q: What dimensional tolerances can you guarantee for custom drawings?
A: Our standard machining tolerance is +/-0.1 mm for wall thickness and diameters up to 200 mm. Larger dimensions or tighter tolerances (down to +/-0.05 mm) can be evaluated based on your engineering drawings.
Hot Tags: sintered molybdenum crucibles, China sintered molybdenum crucibles manufacturers, suppliers, factory
