CRYSTAL GROWTH
Crystal growth molybdenum electrode
High-purity Mo ≥99.95% | Rod, shaft or disc | Stable high-temperature heating
WeiBeam · Electrode solutions for high-temperature melting
These electrodes provide heating in Czochralski growth furnaces for sapphire, optical crystals and laser crystals. As a high-temperature heating component, the electrode establishes a stable thermal field, and its purity and high-temperature strength directly affect temperature stability during growth. Crystal growth often takes place near 2000 °C in strongly reducing or inert atmospheres, demanding high-temperature performance and tight impurity control. Molybdenum at ≥99.95% purity, with a melting point of 2620 °C, helps maintain a stable thermal field and reduces defects and contamination.
As a high-purity electrode supplier, we offer rods, shafts and discs for crystal growth, sized to the furnace and heating method, with selection and technical support.
In high-temperature melting and thermal-field systems this part is often used alongside electrodes elsewhere in the line. We recommend selecting them together against furnace structure, assembly method and working temperature to reduce thermal-expansion mismatch between different materials.
FEATURES
Crystal growth molybdenum electrode — key features
Core characteristics for furnace conditions and operating requirements.
High purity, low impurities
Mo ≥99.95% limits interference with crystal composition and optical performance.
High-temperature stability
Melting point 2620 °C; stable and creep resistant in the growth furnace thermal field.
Uniform heating
Stable conduction supports a uniform thermal field and consistent crystal quality.
Custom forms
Rods, shafts and discs sized to furnace structure and heating method.
SPECIFICATIONS
Specification data
Electrodes are controlled to YS/T 1312-2019 and accepted under a mutual technical agreement. Special sizes can be customized to furnace conditions.
| Parameter | Specification |
|---|---|
| Process | Czochralski growth furnace heating for sapphire, optical and laser crystals |
| Form | Rod / shaft / disc (customizable) |
| Molybdenum content | ≥99.95% |
| Melting point | 2620 °C |
| Density | ≥10.2 g/cm³ |
| Elastic modulus | ≈315 GPa |
| Hardness / conductivity | ≥85 HRB | ≥30% IACS |
| Standard | YS/T 1312-2019 |
Material and physical properties
| Parameter | Typical value / note |
|---|---|
| Available grades | Mo1 (pure Mo) / MoLa (lanthanum-doped) / TZM (Ti-Zr-Mo) / Mo-Zr ODS |
| Molybdenum content | ≥99.95% (higher purity by technical agreement) |
| Density | ≥10.2 g/cm³ (varies slightly by grade and condition) |
| Melting point | ≈2620–2623 °C |
| Resistivity (20 °C) | ≈0.053 µΩ·m |
| Conductivity | ≥30% IACS |
| Thermal expansion | ≈5.25×10⁻⁶/°C |
| Elastic modulus | ≈315 GPa |
| Hardness | ≥85 HRB (by grade and condition) |
| Standards | Electrodes to YS/T 1312-2019; rods to ASTM B387 / GB/T 17792; plate and discs to ASTM B386 / GB/T 3876; other parts by technical agreement |
| Factory inspection | Spectral composition, density, metallography, ultrasonic inspection, dimensions and appearance |
| Delivery documents | Mill certificate with full batch traceability |
Typical values for pure molybdenum. MoLa, TZM and special sizes follow the mutual technical agreement and the test report supplied with each batch.
FAQ
Common questions
Selection, customization and quotation questions.
Which metrics matter when choosing a crystal growth electrode supplier?
Look at molybdenum content and impurity control, structural density, dimensional accuracy and creep behavior at high temperature. Request composition and density data and run a small trial to verify thermal-field stability.
Can high-purity molybdenum be used in sapphire growth furnaces?
Yes. Sapphire Czochralski furnaces commonly use high-purity molybdenum for heating and support parts. Mo ≥99.95% helps maintain thermal-field stability and crystal quality; forms and sizes can be customized to the furnace.
Can these electrodes be machined into discs or special shapes?
Yes. In addition to rods and shafts, discs and special shapes can be machined to drawings, with internal quality checked by ultrasonic inspection and metallography, and a mill certificate supplied.
CUSTOM
Selection and quotation
Share your furnace structure and process conditions. Our engineers will help select the right electrode and you can request a standard-size sample. We support export customers worldwide with remote technical coordination.