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WM0120 Tungsten Crucible (High Purity W Crucible)

Catalog No.WM0120
SizeCustomized
MaterialPure W
PurityW≥99.95%
Density18.2-19.0 g/cc
Surface FinishPolished to Ra≤3.2

TFM specializes in the production of high-quality tungsten crucibles and an array of tungsten components. Our product range includes tungsten heaters, heat insulation screens, tungsten sheets, supports, and more. We are committed to delivering customized solutions tailored to your exact specifications and drawings.

Introduction

The Tungsten Crucible (High Purity W Crucible) is designed for extreme high-temperature applications where material purity, thermal stability, and minimal contamination are critical. With the highest melting point among all metals and exceptionally low vapor pressure, high-purity tungsten crucibles are widely used in vacuum evaporation, crystal growth, and advanced materials research. They are a preferred choice for laboratories and industrial users working under ultra-high vacuum or inert atmospheres.

Detailed Description

High-purity tungsten crucibles are produced from refined tungsten powder using powder metallurgy, sintering, and precision machining processes. Strict control of impurity levels ensures excellent chemical stability and resistance to grain growth at elevated temperatures.

Compared with standard tungsten components, high-purity W crucibles offer:

  • Lower outgassing and evaporation rates, critical for UHV and thin-film deposition

  • Improved chemical inertness, reducing interaction with molten metals and compounds

  • Superior dimensional stability, even during repeated thermal cycling

These crucibles are available in various configurations, including cylindrical cups, tapered designs, boats, and fully customized geometries. Wall thickness, surface finish, and tolerances can be optimized to match specific heating methods such as resistance heating or electron-beam evaporation.

Applications

High-purity tungsten crucibles are commonly used in:

  • Thermal and electron-beam evaporation for thin-film deposition

  • High-temperature melting of metals, alloys, and compounds

  • Semiconductor and optoelectronic material processing

  • Single-crystal growth and advanced R&D experiments

  • Vacuum furnaces and ultra-high-temperature laboratory systems

Technical Parameters

ParameterTypical Value / RangeImportance
MaterialTungsten (W)Provides maximum temperature capability
Purity99.95% – 99.99%Minimizes contamination and outgassing
Melting Point~3422 °CEnables extreme high-temperature operation
Density≥ 18.5 g/cm³Ensures mechanical strength and durability
Operating EnvironmentVacuum / Inert gasPrevents oxidation at high temperature
ShapeCup, Boat, CustomCompatible with various heating systems

Comparison with Related Crucible Materials

MaterialKey AdvantageTypical Application
High Purity Tungsten (W)Ultra-high melting point, very low vapor pressureUHV evaporation, extreme temperatures
Molybdenum (Mo)Easier machining, lower costMedium-high temperature furnaces
GraphiteExcellent thermal shock resistanceNon-oxidizing atmospheres
Alumina (Al₂O₃)Chemical stability in airOxidizing environments, lower temperatures

FAQ

QuestionAnswer
Can the tungsten crucible be customized?Yes, dimensions, wall thickness, and shapes can be tailored to your application.
Is it suitable for use in air?No, tungsten oxidizes at high temperatures and should be used in vacuum or inert gas.
Which heating methods are compatible?Resistance heating, electron-beam heating, and induction heating with a susceptor.
Is it suitable for semiconductor processes?Yes, high purity W crucibles are widely used in semiconductor and thin-film applications.

Packaging

Our High Purity Tungsten Crucibles are individually tagged and labeled to ensure full traceability. Each crucible is vacuum-sealed and packed with protective materials to prevent oxidation or mechanical damage during storage and transportation, ensuring safe delivery and consistent quality.

Conclusion

The Tungsten Crucible (High Purity W Crucible) is a reliable solution for ultra-high-temperature and high-vacuum applications requiring exceptional purity and thermal stability. With customizable designs and strict quality control, it meets the demanding requirements of research laboratories and advanced industrial processes.
For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.

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FAQ

A crucible is a heat-resistant container designed to hold materials during high-temperature processes such as melting, alloying, or chemical reactions. They’re essential in metal casting, laboratory analyses, and even certain thin-film deposition systems.

Crucibles are usually made from ceramics like alumina, zirconia, silicon carbide, or magnesia due to their high melting points and chemical inertness. Graphite and metal (e.g., steel) crucibles are also used for lower temperature applications.

The ideal crucible depends on the temperature and chemical nature of the process. Always select a crucible material with a melting point significantly higher than that of the material being processed and one that is chemically compatible to prevent reactions or contamination.

Always wear appropriate personal protective equipment (PPE) such as heat-resistant gloves, face shields, and aprons. Use proper tongs for handling, ensure adequate ventilation, and follow established protocols to avoid thermal shock and accidental spills.

Prior to use, crucibles are usually “dried” or pre-fired to remove moisture and avoid thermal shock. Some applications recommend a seasoning or “dressing” process to improve performance and extend the crucible’s lifespan.

Crucibles should be stored in a dry, well-ventilated area on wood shelving or other non-abrasive supports—not directly on concrete or metal floors—to avoid damage. They should also not be nested together to prevent chipping or cracking.

Yes, most crucibles are designed for multiple uses if they’re properly maintained and cleaned. However, frequent use at extreme temperatures or for reactive materials may eventually degrade them, in which case replacement is necessary.

Common challenges include cracking from rapid temperature changes (thermal shock), contamination from residual materials, and wear or erosion from high-temperature exposure. Following proper handling and maintenance guidelines helps mitigate these issues.

Allow the crucible to cool completely, then remove any residues with a suitable scraper or chemical cleaner if recommended. Some crucibles benefit from an acid wash to remove stubborn deposits—but always follow the manufacturer’s guidelines to prevent damage.

Ensure the crucible is pre-heated and free of moisture. Load the material slowly and evenly using appropriate tools to prevent splashing or uneven heating. For heavy or large pieces, use tongs or specialized equipment to maintain safety and consistency.

In metal casting, crucibles are used to melt and hold metals for forming alloys or casting components. In evaporation processes (e.g., thin-film deposition), they heat materials to their vaporization point, allowing controlled deposition onto substrates.

Their ability to withstand extreme temperatures and resist chemical reactions makes crucibles indispensable. They enable precise control over high-temperature processes in metallurgy, materials science, and chemical analysis, ensuring product quality and process reliability.

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