MOLYBDENUM BOAT
Molybdenum boat
Wall 0.5–3mm | Mo ≥99.95% | Pressed / welded / machined | Custom to drawing
WeiBeam · Electrode solutions for high-temperature melting
A molybdenum boat is a boat-shaped high-temperature carrier, also called a molybdenum carrier boat, used to hold powders, granules or workpieces during vacuum sintering, melting, evaporation and heat treatment. Common wall thickness is 0.5–3mm; boat shape, length-to-width ratio, capacity and legs are made to the furnace and fixture dimensions.
Most boat failures come from wall thinning, local deformation and overloading. Size the wall and support method from the batch load, avoid a suspended bottom, and agree a minimum wall and replacement interval for repeated use.
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
Molybdenum boat — key features
Core characteristics for furnace conditions and operating requirements.
Flexible forming
Pressing, bent-and-welded or fully machined boats with legs.
Controlled wall
Commonly 0.5–3mm, selected by load and use frequency.
High-temperature stability
Holds shape in vacuum and reducing atmospheres under repeated cycles.
Fixture options
Can be designed with molybdenum supports and pads to reduce handling deformation.
SPECIFICATIONS
Specification data
This product is accepted to the relevant material standard or a mutual technical agreement, with key dimensions, density and material inspected batch by batch. Special sizes can be machined to drawing.
| Parameter | Specification |
|---|---|
| Form | Boat carrier / boat with legs / multi-layer boat |
| Wall thickness | Typically 0.5–3mm |
| Common size | Length 100–400mm, width 30–200mm, custom to drawing |
| Grades | Mo1 / MoLa / TZM |
| Molybdenum content | ≥99.95% |
| Density | ≥10.15 g/cm³ |
| Forming | Pressing, bent-and-welded, fully machined |
| Typical uses | Vacuum sintering carriers, melting boats, evaporation source carriers, heat-treatment fixtures |
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 | Accepted to the relevant material standard or a mutual 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.
How is the wall thickness of a molybdenum boat chosen?
From the batch load and use frequency. Take a thicker wall for heavy or repeated duty and agree a minimum wall and replacement interval; thin-wall boats reduce thermal mass for light workpieces.
Can a molybdenum boat be reused?
Yes, but life depends on temperature, atmosphere, loading and ramp rate. Record batches and wall measurements, and replace when thinning or bottom deformation appears.
Can you copy an existing boat?
Yes. Provide the part or a drawing with wall, outline, legs and tolerances; a sample is recommended before a production run.
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.