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Related Products: Sapphire Windows
サファイアは、化合物酸化アルミニウムの単結晶形であり、それはダイヤモンドの後に自然の中で二番目に硬い材料です。サファイアは、光学透過性、物理的強度、耐衝撃性、磨耗、腐食、高圧、温度耐久性、生体適合性を提供し、様々な用途に対応できる形状に成形することができます。光・電子デバイス製造用半導体材料の蒸着に最適な基材です。
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Sapphire properties |
Benefits |
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Resistant to high temperatures |
Does not melt at the temperature below 2050°C. Retains purity in high-temperature environments |
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Rigid and durable |
Resistant to scratching by a majority of materials Resistant to high pressure Enduring |
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Chemically inert, insoluble in the majority of conventional industrial solutions and corrosion-resistant |
Can be used in aggressive environment Easily washed Long-life performance Possess high purity In some environments operating life of sapphire up to 5 times more than of quartz |
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Wide transmittance spectrum in UV, visible IR and microwave ranges |
Continuous and stable transmittance of infra-red rays Outstanding light transmittance at 0.25 – 4.50 μm |
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High thermal conductivity |
Enables rapid heating and cooling |
Sapphire characteristics:
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General |
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Chemical formula: |
Al2O3 |
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Growing method: |
Kyropoulos, Stepanov (EFG) |
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Structure: |
hexagonal |
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a = b = 4.77 A |
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c = 13.04 A |
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Thermal |
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Melting temperature: |
2040 °C |
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Linear expansion coefficient: |
6.7 x 10-6 / °C parallel to С axis |
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5.0 x 10-6 / °C perpendicular to С axis |
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Thermal conductivity: |
46.06 W/m °K (0°C) |
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Mechanical |
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Density: |
3.98 g/cm3 |
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Hardness: |
Mohs: 9 |
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Knoop: 1800 daN/mm2 parallel to С axis |
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2200 daN/mm2 perpendicular to С axis |
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Tensile strength: |
400 MPa/mm2 (25°C) 275 MPa/mm2 (500°C) 345 MPa/mm2 (1000°C) |
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Flexural strength: |
35 to 39 daN/mm2 |
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Compression stress: |
2.0 GPa |
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Young's modulus |
3.6 x 104 to 4.4 x 104 daN/mm2 |
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Electric |
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Dielectric permeability: |
9.3 (103 - 109 Hz, 25°C) perpendicular to С axis |
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11.5 (1033 - 109 Hz, 25°C) parallel to С axis |
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Specific resistivity: |
1016 Ω/cm (25°C) |
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1011 Ω/cm (500°C) |
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106 Ω/cm (1000°C) |
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