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Alumina Crucible
Alumina Crucible
Alumina Crucible

AC0925 Alumina Crucible

Catalog No.AC0925
MaterialAl2O3
Purity99%, 99.8%
Density3.8~3.9 g/cm3

Alumina crucibles come in a wide range of shapes, purity levels, dimensions, and price points. TFM, a reliable supplier of sputtering targets, also specializes in producing evaporation materials and containers, ensuring top-quality products for various applications.

Overview of Alumina Crucibles

Alumina crucibles are ceramic components renowned for their excellent thermal conductivity, high compressive strength, and resistance to thermal shock. Their low thermal expansion rate makes them ideal for high-temperature applications, especially in furnaces, thermocouple sheaths, and tubes. Due to its exceptional hardness and wear resistance, alumina is commonly used in components like ball valves, piston pumps, and deep drawing tools. Furthermore, alumina can be bonded with metals and other ceramics through brazing and metalizing techniques. These crucibles withstand high temperatures without contaminating most molten metals, ensuring the purity of the materials being processed.

Alumina Crucible Properties

Key Specifications

SpecificationAL97AL98
Al₂O₃ Content97%99.80%
ColorWhiteIvory
Tensile Strength30 Kpsi32 Kpsi
Flexural Strength55 Kpsi60 Kpsi
Compressive Strength300 Kpsi330 Kpsi
Density3.70 g/cc3.92 g/cc
Hardness13.8 HV, GPa18 HV, GPa
Thermal Conductivity25 W/(m·K)32 W/(m·K)
C.O.T.E.7.7 In/In°C (x10⁷)7.8 In/In°C (x10⁷)
Operating Temperature1500 °C1750 °C
Dielectric Constant9.59.8
Volume Resistivity>10¹⁴ Ohm-cm>10¹⁵ Ohm-cm
Dielectric Strength16 KV/mm20 KV/mm

These properties demonstrate the versatility and durability of alumina crucibles, making them an ideal choice for various industries.

Common Applications of Alumina Crucibles

Alumina (Al₂O₃) crucibles are widely used across multiple sectors due to their durability and high-temperature performance. Here are some key applications:

  • Semiconductor Manufacturing: Ideal for components in chemical vapor deposition (CVD), ion implantation, and photolithography processes.
  • Industrial Equipment: Used for products like injector tubes, gas nozzles, and insulators in traditional industries.
  • High-Temperature Furnaces: Maintains strength and hardness at elevated temperatures, making it perfect for industrial furnace parts.
  • Thermocouple Protection: Serves as a protective layer for high-temperature thermocouples.
  • Chemical Processing: Due to its resistance to corrosion, it is commonly employed in the chemical industry.

Alumina Crucible Productions (TFM Facilities)

Alumina Crucible Factory TFM

Packaging and Handling

Alumina crucibles are packaged with the utmost care to prevent damage during transit and storage. This careful handling ensures the product arrives in optimal condition, preserving its integrity and performance.

This combination of properties and wide range of applications makes alumina crucibles essential in demanding industrial environments.

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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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