|Site Map||Home | About Us | Contact Us | Visit Us | 蓝宝石生长炉用钨钼制品 | 藍寶石生長爐用鎢鉬製品 | サファイア用タングステンとモリブデン製品の炉 | Language|
Tungsten and Sapphire
Tungsten Crucible for Sapphire Growth Furnace
Tungsten Crucible Cover for Crystal Growth Furnace
Tungsten Bracket for Sapphire Furnace
Tungsten Heat Shield for Crystal Furnace
Tungsten Electrode Screen for Sapphire Crystal Furnace
Tungsten Heater for Sapphire Growth Furnace
Tungsten Wire Heater for Sapphire Crystal Furnace
Tungsten Rhenium Wire for Sapphire Crystal Growth Furnace
|You're viewing: Home >>Sapphire Growth Method- Vertical Gradient Freeze Method (VGF)
The features of VGF method are as following:
1) The shape of the crystals may vary depending on the shape of a crucible for growing profiled crystals;
2) Plusing the seed crystal growth orientation can also be natural nucleation, based on the principles of geometry out of the crystal growth;
3) This method can be closed or semi-closed crucible to grow. Prevent evaporation melt dopant, resulting in compositional deviation and doping concentration, and can be on the surrounding environment pollution and hazardous substances;
4) It is suitable for large size, growing large number of crystals. A furnace can grow a few or dozens of different root, different sizes of crystals.
5) Operation process is relatively simple, easy to implement procedures and automation. VGF main drawbacks as follows:
a) The whole process of crystal growth is carried out inside the crucible, which is not easy to observe the growth because of the invisible material of tungsten. If the crucible is not made of tungsten, mo, or other metals, but glass, then it would be different.
b) Different crystals require specify physical and chemical properties of the crucible. Especially in matching the crucible and the thermal expansion coefficient of crystalline material to the right, while unsuitable for crystal growth of crystalline material volume expansion.
c) Tungsten crucible will stress and create parasitic crystal nucleation crystal during the sapphire growth. Therefore, the requirement of inner surface finish for crucible is very high.
d) When using Vertical Gradient Freeze method to grow sapphire crystal, the going down of crucible is not rotating, so that the quality of crystal is not better than the one grows out by grow out by Czochralski method.
If there is any other question refer to tungsten crucible for sapphire growth furnace, please feel free to contact us through the following methods:
Tel.:+86 592 512 9696
Fax:+86 592 512 9797
|Media Center>||[Information Bank] [Dictionary of tungsten] [Products Pictures' Bank] [Live Video of Processing] [Videos of Machining] [Catalogs]|
|Chinatungsten Group>||[Tungsten Carbide Supplier] [CTIA] [CTIA-EN] [CTIA-日本語] [Molybdenum Product] [Tungsten Darts] [Tungsten Wire] [Infosys] [Tungsten Bars/Rods] [Paper Weight] [Tungsten Carbide Powder] [Tungsten Copper] [Chatroulette] [Darts Wholesale] [Tungsten Wikipedia]|
|[Tungsten Alloy] [Tungsten Carbide] [XATCM ] [Infosys] [DartChina Club] [Tungsten Heater] [Tungsten Powder] [Tungsten Fishing]|
|[Bucking Bar] [Tungsten Heavy Alloys] [Tungsten Carbide Jewelry] [Metals Price][Xiamen Tungsten]|