Sapphire and LED

LED sapphire refers to a substrate sheet for the processing of synthetic sapphire

( single crystal alumina ) . Synthetic sapphire ( single crystal alumina ) may be used in decorative applications ( such as jewelry , sheet glass , etc. ) , industrial materials and the semiconductor substrate such as windows , dedicated to the LED sapphire substrates require special orientation and low dislocation density, etc. Therefore, synthetic sapphire belongs to the high-end products.

LED sapphire

The first low fabricating a gallium nitride liner (GaN) -based epitaxial wafer , this process mainly in the metal organic chemical vapor deposition epitaxy furnace complete. Ready to produce GaN-based epitaxial wafer and a variety of source materials required purity of the gases , follow the step by step process requirements of the wafer can be done. The substrates used are sapphire, silicon carbide and silicon substrate , as well as GaAs, AlN, ZnO and other materials. MOCVD is the use of gaseous reactants ( precursors ) and the organometallic group Ⅲ and Ⅴ family reaction of NH3 on the surface of the substrate , the desired product is deposited on the substrate surface. By controlling the temperature, pressure, reactant concentrations and type of scale , thereby controlling the coating composition , the crystal quality of the same . MOCVD epitaxial furnace production of LED epitaxial wafers is the most commonly used devices. Next is a LED PN junction of the two electrodes for processing , the electrode processing is the key process of production of LED chips , including washing , evaporation , yellow, chemical etching , fusing , grinding ; then dicing the LED MAO , tested and sorting , you can get the desired LED chips. If the wafer cleaning is not clean enough , evaporation system is not normal , it will lead to deposition of the metal layer ( refer etched electrode ) will fall off, the appearance of discolored metal layer , gold foam and other abnormalities. Deposition process is sometimes required collet fixing chips, it will produce clamp marks ( in addition to visual inspection must pick ) . Yellow operations include baking, the photoresist , photographic exposure, development , etc., if the developer does not have holes in the mask will be full and luminous area residues more metals. Wafer manufacturing process in the preceding paragraph , the system Cheng Ruqing wash , evaporation , yellow, chemical etching , fusing , grinding and other operations must use the forceps and baskets , vehicles and so on, so there will be grain electrode scratching things from happening .

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What Is The Sapphire

sapphire crystal plane diagram

Sapphire Details

The composition of aluminum oxide sapphire (Al2O3), is composed of three aluminum atoms and two oxygen atoms covalently type combination , the crystal structure of hexagonal lattice structure which is often used for the cut surface with A-Plane, C-Plane and R-Plane. sapphire optical penetration as a wide band , from the near-ultraviolet light (190nm) to the infrared have good light transmission. therefore been widely used in optical components, infrared devices , high strength laser lens material and the mask material , it has a high acoustic velocity , temperature, corrosion resistance , high hardness , high light resistance, high melting point (2045 ℃) , etc., it is a very difficult to process materials , it is often used as the material of the photovoltaic element . Currently high brightness white / blue LED depends on the quality GaN epitaxy (GaN) material quality , and the quality of the epitaxial GaN and sapphire substrate used is closely related to the quality of surface finish , sapphire ( single crystal Al2O3) C surface and Ⅲ - Ⅴ and Ⅱ - Ⅵ family deposited film lattice constant mismatch between the rate is small , consistent with the high-temperature GaN epitaxial process requirements , such as the sapphire wafer produced white / blue / green LED of the key materials .

If you are interested in our products , please feel free to send us an email : sales@chinatungsten.com, or call us: 00865925129696 , 00865925129595 . We will sincerely serve you.

Tungsten-Rhenium Wire And Sapphire

tungsten rhenium wire

Tungsten-rhenium wire in sapphire furnace is mainly used for the production Tungsten-rhenium wire is mainly used rhenium content of 25% tungsten rhenium wire.

After recrystallization tungsten are used at high temperatures may become very brittle. In a state of shock break off easily be broken. In some of the requirements of high-performance light source, in order to prevent the filament breakage, typically require the addition of rhenium tungsten, tungsten-rhenium wire is brittle tungsten can be extended, even at a lower temperature is room temperature or lower temperature.

We provide added rhenium tungsten rhenium wire, than pure tungsten at high temperatures with better flexibility and stability.

Because of these characteristics of tungsten-rhenium wire, so as a sapphire growth furnace with a bundle of wire becomes the perfect fit.

If you have any questions about Sapphire tungsten and molybdenum furnace problems and needs related to the trouble to keep in touch with us.
E-mail: sales@chinatungsten.com
Phone: +86 5925129696
Fax: +86 5925129797
bundled role.

Tungsten Heating Element And A Sapphire

Sapphire crystal growth mainly tungsten heating element is a heating element

tungsten heating body

made ​​of tungsten . This component is the sapphire furnace production is a central component . There are single-phase and three-phase heater . As a core component of industrial furnaces . Heating element with high efficiency, good temperature uniformity , stable quality, long life characteristics.
Tungsten filament heating element is in the sapphire growth furnace applications a major purpose. There are some other important uses tungsten . Except for a small high-temperature furnace used for heating material , tube heater and the composite material reinforcement , the vast majority are used to make a variety of incandescent and halogen and gas discharge lamp filament electrodes . Mainly used in the production of coiled incandescent filament , the cathode of the power tube and support structure, high temperature furnace heating element and the metal evaporation source of the processing . Thick of tungsten wire,straightening after surface treatment , and cut into a number of rod-shaped , widely used in lighting and electronics industry in glass-metal seal member.

Tungsten heating element is usually made ​​of tungsten strip folded into a middle left blank cover . This cover after power , can produce heat. This is the sapphire growth is an important part of the furnace .

Tungsten Heat Shield And Sapphire

Tungsten known thermal heat shield sheet , mainly by 99.95% or more of the tungsten raw material made ​​of pure tungsten film. Sapphire growth furnace insulation screen size is relatively large, a part of the sheet type, generally polished based, but there are fur shape.

tungsten heat shield

Sapphire growth furnace with tungsten heat shield of the production process is mainly tungsten powder by hot isostatic pressing sintering after forming into a slab of tungsten , tungsten slab after rolling mill and then , through the molding cutting shears tungsten and tungsten plates into sheets mainly used to produce electric vacuum furnace heating elements , heat shields and electric vacuum electric light source parts , etc. after the sheet metal forming tungsten made ​​tungsten boat for vacuum coating vessel .

Sapphire growth furnace with tungsten heat shield with HRC and CRC , and its products can be used in electronics, vacuum and other industries. Sapphire growth furnace is an overall rise of uses. Sapphire crystal growth provides a good insulation barrier.

If you have any questions about Sapphire tungsten and molybdenum furnace problems and needs related to the trouble to keep in touch with us .
E-mail : sales@chinatungsten.com
Phone: +86 5925129696
Fax: +86 5925129797

Tungsten Crucible Furnace Cover And Sapphire

Tungsten crucible sapphire crystal growth characteristics become the main

tungsten crucible cover

As sapphire growth furnace insulation components , molybdenum and tungsten crucible reflective screen cover is the most critical role in the furnace heat barrier and reflective , high purity , size, accuracy , smooth surface , easy assembly, the rational design of insulation components to improve the quality of the sapphire crystal pulling has a very important significance.

Tungsten and tungsten crucible cover closely to the production of a sapphire crystal confined space . Control the density of space is growing out of sapphire growth furnace key factors for quality sapphire crystal . ChinaTungsten Online because had long experience , the production of tungsten and tungsten crucible cover and support frame is used by the client to accept, so the quality is guaranteed.carrier.Sapphire growth furnace with tungsten crucible lid is more than 99.95% purity sintered tungsten products , density is generally about at 18.3g/cm3 . Tungsten crucible is set tungsten crucible lid part of the product , in addition to tungsten and tungsten crucible crucible base , or tray. Tungsten crucible lid also known as tungsten crucible cover.

The Principle and Introduction of Sapphire Furnace Dan Changjing application

The composition of aluminum oxide sapphire (Al2O3), is composed of three aluminum atoms and two oxygen atoms covalently type combination, the crystal structure of hexagonal lattice structure which is often used for the cut surface with A-Plane, C-Plane and R-Plane. Since sapphire optical penetration with very wide, from near UV (190nm) to mid-infrared have good light transmission. Therefore, the optical element is used in a large, infrared devices, laser lens material of high strength and mask material, which has high sound speed, temperature, corrosion resistance, high hardness, high light resistance, high melting point (2045 ℃), etc., it is a very difficult to process materials, it is often used as a material of the photovoltaic element. Currently high brightness white / blue LED depends on the quality GaN epitaxy (GaN) material quality, and the quality of the epitaxial GaN and sapphire substrate used is closely related to the quality of surface finish, sapphire (single crystal Al2O3) C surface and Ⅲ - Ⅴ and Ⅱ - Ⅵ family deposited film lattice constant mismatch between the rate is small, consistent with the high-temperature GaN epitaxial process requirements, such as the sapphire wafer produced white / blue / green LED of the key materials .

Molybdenum for Sapphire Growth Furnace

Molybdenum for Sapphire Growth Furnace

Molybdenum Barrel Screen, one kind of molybdenum heat shield, but riveted into the barrel shape.

Molybdenum boat

Material: pure Molybdenum and TZM alloy

Dimensions: (20mm-100mm) x (20mm-100mm) x (50mm-800mm) length; thickness (0.5mm-5.0mm)

Performance: high temperature resistant, not easily deformed, has long service life

Tungsten and Molybdenum for Sapphire Growth Furnace

Tungsten and Molybdenum for Sapphire Growth Furnace

Spiral mesh tungsten heater can improve the uniformity of the temperature zone. It has the property of long service life and is difficult to be damaged.

 

As the components for heat insulation of sapphire growth furnace, molybdenum reflective shield and the upper and lower cover plate play a key role in insulating and reflecting the heat in the furnace. With high purity, size precision, smooth surface, easy assembly, reasonable design, the component for heat insulation plays an important role in improving the quality of the sapphire crystal.

Tungsten for Sapphire Growth Furnace

Tungsten for Sapphire Growth Furnace

Since the melting point of the tungsten is up to 3410℃, the tungsten crucible is widely used in the sapphire single crystal growth furnace, quartz glass melting furnace, rare earth smelting furnace and other core container in industrial furnace. In general, the temperature of the working environment of tungsten crucibles is over 2000℃.

With the property of high purity, high density, well-made and reasonable design, tungsten heater components are of great importance in the quality control, energy conservation, and service life of sapphire crystal.

Sapphire and tungsten

Sapphire and tungsten

Because of its dielectric and crystallographic properties, sapphire is the wafer material for producing a variety of electronic applications. And sapphire is the basic material for LED production.

LED sapphire products

The melting point of tungsten is 3410 ℃ and the boiling point is 5900 ℃. At 10~100℃, the thermal conductivity of tungsten is 174 W / m·K. The hardness and density of tungsten is high (density is 19.25g/ cm3). Therefore, tungsten is widely used in crucible, heater, cover plate and base plate, heat shield in the sapphire production.

 

 tungsten crucible

 tungsten cover plate