Pure Molybdenum Crucibles
Engineered for high-temperature environments where dimensional stability, high melting performance, and strict contamination control are critical, our high-purity pure molybdenum crucibles are trusted by global leaders in semiconductor processing, optical coating, and advanced material synthesis.
- Product Introduction
High-Purity Pure Molybdenum Crucibles for Extreme Thermal Environments
Engineered for high-temperature environments where dimensional stability, high melting performance, and strict contamination control are critical, our high-purity pure molybdenum crucibles are trusted by global leaders in semiconductor processing, optical coating, and advanced material synthesis.
Backed by ISO 9001 certified manufacturing and raw materials compliant with ASTM standards (such as ASTM B387), our crucibles deliver reliable performance in extreme thermal fields. Mill test certificates (MTC) are provided with every shipment to ensure full material traceability.
Key Material Properties & Performance Advantages
Purity & Contamination Control
• Standard Purity: Mo >= 99.95% (certified via chemical analysis).
• High Purity Grades: Up to 99.99% available upon request for sensitive electronic and optical applications.
• Practical Benefit: Minimizes material outgassing, prevents chemical reactions between the crucible and the melt, and eliminates coating defects caused by trace impurities.
High-Temperature Structural Stability
• Melting Point: 2,623°C (4,753°F)
• Density: Approximately 10.2 g/cm3
• Operating Atmosphere Note: Must be operated under a high vacuum or protective/reducing atmospheres (such as pure hydrogen or inert argon) to prevent high-temperature oxidation above 600°C.
Dimensional Stability under Thermal Cycling
Featuring a low thermal expansion coefficient of 5.0 x 10^-6 /K (20--1000°C), our crucibles withstand rapid heating and cooling cycles without suffering immediate dimensional distortion or severe thermal shock cracking.
Primary Industrial Applications
Semiconductor & Crystal Growth: Utilized in high-temperature material synthesis, crystal growth support components (including LED sapphire crystal growth), and vacuum furnace hot-zone components.
Vacuum Coating & Thin-Film Deposition: Applied in resistance heating evaporation sources for optical films, metal coatings, and protective layers.
Plastic Mold Surface Modification (PVD/CVD): Deployed in vacuum coating systems for processing injection and extrusion molds with hard coatings (TiN, CrN, DLC) to enhance surface hardness and extend tool wear life.
Advanced Laboratory Processing: Ideal for high-purity thermal experiments and high-temperature research facilities.
Manufacturing Capabilities & Customization
We oversee the entire production pipeline from raw material blank selection to final CNC machining and packaging:
Deep Drawing: Ideal for seamless, thin-walled cylindrical crucibles.
Precision Machining: Turned from solid molybdenum bars or forged blanks for thick-walled or complex geometries.
Welded Construction: Specialized solutions for large-diameter or custom geometry configurations.
Customization Options:
Dimensions: Customized outer diameter (OD), inner diameter (ID), and overall depth/height per your engineering drawings.
Wall Thickness: Uniform or variable thickness profiles tailored to specific thermal gradient requirements.
Surface Finishes: As-machined, chemically cleaned, or mechanically polished to achieve vacuum readiness.
Molybdenum vs. Alternative Crucible Materials
|
Material |
Key Advantage |
Limitation |
|
Pure Molybdenum |
High melting point, low thermal expansion, excellent vacuum purity, cost-effective compared to tungsten. |
Requires vacuum or inert/reducing atmosphere above 600°C. |
|
Tungsten |
Higher melting point than molybdenum. |
Harder to machine, heavier, and significantly higher material cost. |
|
Graphite |
Exceptional thermal shock resistance. |
Prone to carbon contamination in sensitive metal melting/evaporation applications. |
|
Alumina / Ceramics |
Strong chemical resistance to specific oxides. |
High susceptibility to thermal shock cracking under rapid temperature swings. |
Quality Inspection Prior to Shipment
Every production batch undergoes strict quality control checks before packaging:
Material Verification: Purity confirmation via raw material mill test certificates and strict adherence to ASTM specifications.
Dimensional Control: Precision measurement of OD, ID, wall thickness, and concentricity against customer CAD blueprints.
Surface Integrity: Visual and non-destructive screening for micro-cracks, surface inclusions, or machining burrs.
Technical Specifications At-a-Glance
|
Material |
Pure Molybdenum (ASTM Compliant / ISO 9001 Certified) |
|
Minimum Purity |
99.95% |
|
Melting Point |
2,623°C |
|
Density |
Approx. 10.2 g/cm3 |
|
Thermal Expansion |
5.0 x 10^-6 /K (20--1000°C) |
|
Available Geometries |
Round, cylindrical, square, rectangular, or custom drawing-based shapes |
|
Recommended Operating Environment |
Vacuum, hydrogen, or inert gas (argon/helium) atmosphere |
FAQ
Q: What is a pure molybdenum crucible used for?
A: Pure molybdenum crucibles are primary components for high-temperature industrial processes, including vacuum evaporation, PVD/CVD coating, semiconductor crystal growth (like sapphire), high-temperature sintering, and laboratory thermal experiments.
Q: What purity and quality standards do you provide?
A: We supply commercial pure molybdenum crucibles starting at >= 99.95% purity, with ultra-high grades up to 99.99% available. All batches are backed by mill test certificates and manufactured under ISO 9001 guidelines to meet ASTM standards.
Q: Can you manufacture custom sizes based on our technical drawings?
A: Yes. We specialize in custom manufacturing. You can provide your CAD drawings or specifications (OD, ID, height, wall thickness, and tolerance requirements), and our engineering team will evaluate and produce accordingly.
Q: What is the maximum working temperature of molybdenum crucibles?
A: While pure molybdenum has a melting point of 2,623°C, the operational ceiling depends on your furnace atmosphere, heating method, and mechanical load. Because molybdenum oxidizes rapidly above 600°C in oxygen-bearing environments, it must always be used under high vacuum or protective gas.
Q: How do molybdenum crucibles compare to tungsten ones?
A: Tungsten handles even higher temperatures, but molybdenum is much easier to machine, features a lower density (reducing weight), and is far more cost-effective for most standard high-temperature applications.
Q: Do you provide sample testing prior to mass production?
A: Yes, sample and prototype production runs are available for qualification testing, dimensional verification, and thermal compatibility trials before committing to bulk orders.
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