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Formula: Al₂O₃
Form: Crucible
Material: Aluminum Oxide
CAS Number: 1344-28-1
Commodity: Ceramics
Purity: 99.8%

Alumina Flat Bottomed Boat Crucible

Alumina Flat Bottomed Boat Crucible offers high thermal stability, corrosion resistance, and minimal contamination, making it essential for demanding thermal processing tasks. With its flat-bottomed boat design, it provides stability and maximized surface contact for uniform heating, particularly useful in processes such as metal evaporation, oxide material sintering, and high-purity chemical reactions. Key industries that employ this crucible include advanced ceramics, metallurgical research, and semiconductor fabrication. Specific uses include powder calcination in materials science, catalyst preparation for chemical engineering, and thermal treatment of electronic substrates. Research developments have enhanced slip-cast alumina formulations for dimensional accuracy, incorporated gas stirring functions to improve melt homogeneity, and optimized sintering conditions to reduce energy consumption without sacrificing thermal shock resistance. Its performance in maintaining chemical integrity under extreme temperatures ensures it remains a critical asset in both research laboratories and high-precision manufacturing environments.
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Tolerances

Flat Bottomed Boat
External Width ±10%
External Length ±10%
External Height ±10%

Material Properties for Ceramics

Chemical Resistance
Element Value
Acids - concentrated Good
Acids - dilute Good
Alkalis Good
Halogens Good
Metals Good
Electrical Properties
Element Value
Dielectric constant 9-10.1
Dielectric strength( kV mm⁻¹ ) Oct-35
Volume resistivity( Ohmcm ) >10¹⁴@25
Physical Properties
Element Value
Apparent porosity( % ) 0
Water absorption - saturation( % ) 0
Density( gcm⁻³ ) 3.9
Thermal Properties
Element Value
Melting point( C ) 2100
Upper continuous use temperature( C ) 1700
Specific heat( J K⁻¹ kg⁻¹ ) 850-900@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 26-35@20°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 8@20-1000°C
Mechanical Properties
Element Value
Tensile modulus( GPa ) 300-400
Hardness - Knoop( kgf mm⁻² ) 2100
Hardness - Vickers( kgf mm⁻² ) 1500-1650
Shear strength( MPa ) 330
Tensile strength( MPa ) 260-300
Pultrusions
Element Value
Compressive strength( MPa ) 2200-2600

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