- tungsten, molybdenum, tantalum, niobium and rhenium,ods-copper,
cemented carbide.
Hot Zone of Sapphire Growing
Application:
Sapphire crystal is the common form of single crystal. It has a series of excellent physical and chemical properties, such as high strength, high hardness, high temperature resistant, friction resistance, corrosion resistance, good pervious to light performance, good electrical insulating performance and etc .Therefore, sapphire can be widely used in national defense, scientific research, civilian industry, and other areas of the various demanding. Over the past five years, as LED lighting substrate and consumer electronic touch screen marked expanded, sapphire crystal industry got the best opportunities than ever before.
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Crystal structure: |
Six-party crystal series |
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Crystal cell parameters: |
a=4.785 ? , c=12.991? |
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Melting point: |
2045℃ |
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Density: |
3.98g/cm3 |
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Mohs hardness: |
9 |
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Thermal expansion coefficient: |
5.8×10-6/K |
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Specific heat: |
0.418W.s/g/k |
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Thermal conductivity: |
25.12W/m/k (@ 100℃) |
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Refractive index: |
no=1.768 ne=1.760 |
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dn/dt: |
13x10-6/K(@633nm) |
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Pervious to light features: |
T≈80% (0.3～5μm) |
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Dielectric constant: |
11.5(∥c), 9.3(⊥c) |
The sapphire melting point is 2045℃，it is such a high temperature that plenty of high melting point metal such as tungsten and molybdenum are used in the process of sapphire growing.
The methods of crystal growth:
- KY Method: Kyropoulos Method
- TGT Method
- EFG Method：Edge Defined Film-fed Growth
- HEM Method： Heat Exchange Method
- VHGF Method：Vertical Horiaontal Gradient Freezing Method
- Horizontal Bridgman method
KY Method 、HEM and EFG method are mainly used methods.
Material Properties:
Product Specification:
We can provide customers with a full set of tungsten or molybdenum materials which are needed in all kinds of crystal growth methods.
- Tungsten Heater
- Tungsten Crucible
- Tungsten Shields
- Molybdenum Crucible, Molybdenum Tube, Molybdenum Ring, Molybdenum Core Rod
- High Temperature Binding Wire
- Other Custom Tungsten Products
- Tungsten and Molybdenum Alloy
We have the world's large tungsten crucible and tungsten tube manufacturing capability. Our hot zone can satisfy your needs no matter which type furnaces you are using 30kg or 300kg.。
Diameter（mm）
Thickness（mm）
Length（mm）
30-50
8-10
<1300
50-100
8-15
100-150
10-15
150-200
12-20
200-300
15-20
300-400
15-30
400-450
15-30
450-550
15-30
550-650
25-35
650-750
25-35
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