MOLYBDENUM EVAPORATION BOAT
Molybdenum evaporation boat
Wall 0.2–1.5mm | Mo ≥99.95% | Narrow slot / cavity | Custom to coater
WeiBeam · Electrode solutions for high-temperature melting
An evaporation boat carries the evaporant and is resistance-heated during vacuum evaporation, commonly made of molybdenum and also called a molybdenum evaporation boat or coating boat. The structure is usually a thin wall with a narrow slot or cavity that concentrates current in the evaporation zone and limits heat loss.
Key parameters are wall thickness, slot geometry, effective evaporation length and the clamping dimensions at both ends. A thick wall heats slowly while a thin wall has a shorter life; fix these from the coater electrode spacing, evaporant and target rate, and run a life test before a production batch.
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 evaporation boat — key features
Core characteristics for furnace conditions and operating requirements.
Thin wall and narrow slot
Wall 0.2–1.5mm, slot and evaporation length designed to the fixture.
Focused heating
The narrow slot concentrates current and reduces edge heat loss and material creep.
Made to fixture
Clamping size, boat length and slot width matched to electrode spacing.
Batch consistency
Pressed or machined, with dimensions and wall accepted to drawing.
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 | Narrow-slot boat / cavity boat / boat with rims |
| Wall thickness | Typically 0.2–1.5mm |
| Common size | Length 20–150mm, width 8–40mm, custom to coater |
| Grades | Mainly Mo1 pure molybdenum |
| Molybdenum content | ≥99.95% |
| Forming | Pressing, precision machining, welding |
| Process | Resistance-heated vacuum evaporation of functional materials |
| Typical uses | Coating evaporation source, laboratory boats, small-batch coating 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 does an evaporation boat differ from a standard molybdenum boat?
An evaporation boat emphasises a thin wall, narrow slot and resistance-heating efficiency, with dimensions tied to the coater fixture; a standard boat emphasises load capacity and reuse. Each is designed for its own duty.
Is a thinner wall always better?
No. A thin wall heats faster but lasts shorter, while a thick wall heats slowly and uses more energy. Select from the evaporant, target rate and replacement interval, and validate with a small life test.
Can you confirm the slot geometry first?
Yes. Provide electrode spacing, boat length, slot width and effective evaporation length; we issue a confirmation drawing before machining samples.
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.