Raw Materials
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Introduction
Physical properties
Crystal Structure: Rhombohedra Hexagonal Single crystal
Chemical composition: Al2O3
Purity: 99.99%
Specific gravity: 3.99 - 3.98
Mechanical properties
Hardness: Mohs9, Knoop ≥1700kg/mm2
Modulus of elasticity: 3.5X106 to 3.9X106kg/cm2
Compressive strength: 2.1X104 kg/cm2
Tensile Strength: 1.9*103 kg/cm2
Thermal properties
Melting Point: 2050℃
Softening Point: 1800℃
Specific Heat: 0.18 ﹝at 25℃﹞
Thermal Expansion: 6.7*10-6 ∥C-axis 5.0*10-6 ⊥ C-axis
Chemical properties
Acids and alkalis attack: no attached by acid or alkalis, attacked by HF at 300℃
Electrical properties
Dielectric Constant: 7.5 to 10
Electrical Resistivity: 1011Ω/cm at 500℃, 106Ω/cm at 1000℃, 103Ω/cm at 2000℃,
Optical properties
Refractive Index : 1.769 // C-axis,1.760 ± C-axis at 0.5893μm
Visible Light: Excellent
Infrared: 85% 0.75 - 4μm, 70% 4.7μm, 50% 5.2μm
Ultraviolet: 80% 0.4-0.3μm, 60% 0.28μm, 50% 0.2μm
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