Custom Crucibles and Assemblies for Vacuum and Controlled-Atmosphere Furnaces
Tungsten and molybdenum furnace crucibles are refractory-metal containers that hold and support process materials inside vacuum and controlled-atmosphere furnace hot zones.
CHEMETAL USA custom-designs and manufactures each crucible to exacting specifications and customer applications. Backed by our high-temperature furnace systems, thermal-processing, and consulting capabilities, we review the crucible together with its supports, surrounding hot-zone components, furnace atmosphere, process material, and installation requirements.
Typical Furnace Crucibles
- Pressed-and-Sintered Crucibles
- Precision Machined Crucibles
- Spun and Formed Crucibles
- Fabricated and Welded Crucibles
- Crucible Lids
- Crucible Liners
- Crucible Supports
Crucibles are available in pure tungsten, pure molybdenum, TZM, and lanthanated molybdenum. Depending on the material, geometry, wall structure, tolerances, and service conditions, manufacturing may involve pressed-and-sintered material processing, precision machining, spinning, forming, fabrication, or welding where appropriate.
Custom Furnace Crucible Capabilities
| Your Requirement | What CHEMETAL USA Offers |
|---|---|
| Product Scope | Crucibles and fitted assemblies with lids, liners, flanges, or supports. |
| Material Options | Tungsten, molybdenum, TZM, and MoLa. |
| Manufacturing Capabilities | Machining, spinning, forming, fabrication, joining, and assembly. |
| Project Support | New systems, replacement, maintenance, and hot-zone rebuilding. |
| Ways to Get Started | Drawings, CAD files, samples, dimensions, process material, and furnace data. |
Crucible Materials and Manufacturing
| Material | Where It Adds Value |
|---|---|
| Molybdenum | Broad manufacturing flexibility for machined, spun, formed, and fabricated crucibles, including larger or thinner-wall designs. |
| Tungsten | Selected for particularly demanding temperature conditions, applications where low vapor pressure is important, or process-specific compatibility requirements. |
| TZM | Selected where greater high-temperature strength and better resistance to slow deformation (creep) than pure molybdenum are useful. |
| Lanthanated Molybdenum | Selected where better resistance to high-temperature grain-structure change (recrystallization) and greater shape stability are important. |
Matching the Crucible Material to the Process
Crucible design begins with the material it will contain. A refractory metal may withstand the furnace temperature yet still be unsuitable for a particular molten material, oxide, compound, gas, or vapor. CHEMETAL USA therefore evaluates process compatibility, furnace atmosphere, contamination limits, loading, and heating/cooling cycle together. At elevated temperatures, tungsten and molybdenum-based crucibles are generally used in vacuum or controlled non-oxidizing atmospheres.
Shaping the Crucible for the Furnace
Once the material is selected, the manufacturing method is guided by crucible size; wall structure; tolerances; quantity; and any other required features.
- Precision machining supports heavier walls, detailed features, close dimensional control, and replacement fit.
- Metal spinning and forming suit larger or thinner-wall molybdenum crucibles.
- Fabrication and welded construction provide flexibility for custom geometries, flanges, related parts, and suitable joined assemblies.
The design must fit the available hot-zone space; carry the intended load; seat correctly on its supports; maintain the required clearances; and remain practical to install and remove. Wall and bottom thickness, rim or flange features, and support locations are developed around those requirements.
Furnace Crucible Applications
CHEMETAL USA manufactures custom crucibles for high-temperature furnace and thermal-processing applications, including:
- Crystal growth systems — Contain process materials within specialized hot-zone geometries.
- Vacuum melting and holding — Hold compatible materials during high-temperature processing.
- Evaporation and deposition — Provide a refractory-metal container for compatible source materials.
- Sintering and powder processing — Support selected materials through high-temperature furnace cycles.
- Research and custom industrial equipment — Use application-specific sizes, shapes, supports, and assembly features.
Custom and Replacement Furnace Crucibles
CHEMETAL USA supports new crucible designs and replacements for worn, eroded, distorted, obsolete, or difficult-to-source parts. A project can begin with a drawing or CAD model, an existing sample, verified dimensions, photographs, or available furnace and operating information.
An existing crucible is useful evidence, but it may no longer represent the original geometry. Wear, erosion, deposits, and thermal distortion can change the wall, rim, base, or support-contact areas. CHEMETAL USA therefore checks critical dimensions against the furnace and surrounding components before production rather than reproducing a damaged part without inspection and analysis.
Please explore CHEMETAL USA’s complete range of tungsten and molybdenum high-temperature furnace components.
Frequently Asked Questions
How is the right furnace-crucible material selected?
Selection begins with assuring compatibility between crucible, furnace environment, and the material being processed.
Tungsten is used for demanding temperature, low-vapor-pressure, or process-specific requirements; molybdenum offers broader manufacturing flexibility; and TZM or lanthanated molybdenum provide additional options when strength, resistance to slow deformation, recrystallization resistance, or shape stability matter. Atmosphere, geometry, loading, contamination limits, and the heating and cooling cycle complete the material selection analysis.
How is the crucible manufacturing method selected?
Manufacturing method is guided by material; size; wall thickness; tolerances; features; quantity; and replacement-fit requirements. Precision machining supports heavier walls and close detail; spinning and forming suit larger or thinner-wall molybdenum designs; and fabrication or welded construction can be used for suitable joined designs and custom assemblies.
Does a lid make a furnace crucible gas-tight?
No. A lid, cover, or liner can limit direct exposure, splashing, evaporation, or contact with nearby parts, but it does not create a gas-tight chamber unless the assembly is specifically designed and tested for that purpose.
May We Quote You?
To help us efficiently review and quote your furnace-crucible requirement, please send as much of the following as possible:
- Drawing, CAD file, physical sample, or photographs
- Requested or currently used material, dimensions, features, tolerances, and surface-finish requirements
- Operating temperature and furnace atmosphere or vacuum level
- Material being processed, amount and total load weight, and contamination-control requirements
- Support arrangement, surrounding clearances, required quantity, and whether the project is for a new furnace or replacement
CHEMETAL USA will review the available information, identify any missing technical details, and work with you to determine the optimal material and manufacturing approach for the intended application of the crucible or related assembly.