Tungsten for Sapphire Growth Furnace

Tungsten for sapphire growth furnace is for its unique properties, especiaaly for its high melting point and high temperature resistance. Porducts of tungsten for sapphire growth furnace includes tungsten crucible, tungsten plate, tungsten sheet, tungsten cover, tungsten wire, tungsten heater, tungsten heat shield, tungsten electrode screen and tungsten rhenium. And tungsten rhenium wire is not pure tungsten products, but mixing tungsten with rhenium. The most widely used one is with 25% rhenium.

Tungsten for sapphire growth furnace is steel-gray to tin-white hard metal and it is very brittle, which is difficult to be processed. The manufacturing techniques of tungsten are forging, swaging and extrusion. The melting point of tungsten is 3415 ° C. The corrosion resistance is the unique property of tungsten, most of the inorganic acid erosion is can not influence tungsten. Tungsten products will be formed on the surface of a layer of protective oxides in the air, but will be completely oxidized at high temperatures.

Sapphire is an alumina (alpha-Al2O3) single crystal, also known as corundum. The sapphire crystals with excellent optical properties, mechanical properties and chemical stability, high strength, hardness, resistance to erosion, can be work under adverse conditions close to the high temperature of 2000 ℃, which is widely used in infrared military installations, satellite space technology, high-intensity laser window materials, its unique lattice structure, excellent mechanical properties, good thermal properties of sapphire crystal the practical application of semiconductor GaN/Al2O3 of light-emitting diodes (LEDs), LSI SOI and SOS and superconducting nano-structured thin film is the most ideal substrate material.

tungsten-crucible

Sapphire single crystal sapphire growth furnace is designed to nurture Kyropoulos. This method is used the raw materials (aluminum oxide) tungsten crucible to be heated to its melting point of 2050 degrees or more, and then gradually reduced the melting temperature and the crystallization into specific granules. The growth furnace is constructed in a closed mold in the insulation with a special shell, lid and heater. Therefore tungsten products are used for growing sapphire crystal.

Tungsten is widely used in the sapphire grwoth furnace is because tungsten for sapphire growth furnace owms the properties of high temperture resistance, which will not melt with sapphire.

If there is any other inqury refer to tungsten for sapphire growth furnace, please feel free to contact us through the following methods:

Email：sales@chinatungsten.com
Tel.：+86 592 512 9696
Fax:+86 592 512 9797

Molybdenum Property for Sapphire Growth Furnace

The resource of molybdenum is abundant in the crust is about 1 × 10-6, and it is about 2 × 10-6 in the magmatic rocks of granitoids. In geochemical classification, molybdenum belongs to the transitional pro-iron. Inside Mineral Deposits, combining molybdenum and sulfur can form molybdenite.

Molybdenum is silver-white metal, hard and tough. The density of molybdenum is 10.2 g / cm 3, melting point is 2610 ℃, the boiling point of 5 560 ℃and Valence are 2, 4 and 6, the stable one is 6. Molybdenum is a transition element, and can be easily changed its oxidation state.

Molybdenum plays a role in the redox reaction of passing electrons. In the oxidized form, molybdenum is likely to be in the hexavalent state. During electron transfer, it is also likely to first restore the pentavalent state, but also in the restored enzyme found in the other oxidation state of molybdenum. 

Molybdenum is a xanthine oxidase enzyme / dehydrogenase, aldehyde oxidase and sulfite oxidase components, in order to know these essential trace element for humans, animals and plants. Human various tissues containing molybdenum, the total adult body is 9mg, and molybdenum is higer in liver, kidney content.

LED-sapphire

Molybdenum products used in sapphire growth furnace are molybdenum wire, molybdenum crucible, molybdenum cover and so on. Besides used in sapphire crystal growth furnace, molybdenum also has other applications. Molybdenum wire can be used in high-temperature furnace and EDM cutting. molybdenum sheets are widely applied in manufacturing radio equipment and X-ray equipment. Multi molybdenum alloy can improve the elastic limit, corrosion resistance, and maintain a permanent magnetic. Molybdenum is required seven micro-nutrients in a plant growth and development, without it, plants can not survive.

Due to molybdenum property of high temperature,heat,etc., molybdenum products are widely used in emerging sapphire growth furnace and other processing industries.

In addition, the combination of molybdenum and silicon make tungsten to be heating element. The following is a mixture of molybdenum and silicon for the heating element.

Tungsten Property for Sapphire Growth Furnace

Tungsten is an important material to be used in sapphire growth furnace. The products of tungsten used in sapphire growth furnace is using tungsten with the purity over 99.95%. The tungsten for sapphire growth furnace composed of tungsten crucible, tungsten plates, tungsten sheet, tungsten electrode screen, tungsten barrel, and tungsten heater. In addition to the pure tungsten products, tungsten-rhenium wire is necessary for sapphire crystal growth furnace, which is normally used 25% tungsten rhenium wire.

Tungsten is used as the sapphire growth furnace material whose purity is over 99.95%. Pure tungsten products are preferred by the customers of its high density, high temperature resistance, high corrosion resistance, high wear resistance, high hardness, low coefficient of thermal expansion. These properties are also the reasons for sapphire growth furnace chooses tungsten as its main material. The property of high temperature resistance will not decompose tungsten with the crystal atoms, so they can ensure the purity of crystal without much impurities.

Tungsten crucible used in the sapphire growth furnace is using the manufacturing technique of sintering. Generally speaking, the densith of sintering tungsten, such as tungsten crucibke is about 18.2g/cm3. During the process of sintering, the property of tungsten can not be changed.

molybdenum-crucible

Tungsten is a silver-white metal, which is similar to steel. Tungsten owns the properties of high melting point, low vapor pressure, and evaporation rate . The chemical properties of tungsten is very stable at room temperature without reaction with air and water, not heated, any concentration of hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid and aqua regia tungsten does not work, when the temperature rose to 80 ° -100 ° C, the above-mentioned acid addition to hydrofluoric acid, other acids of tungsten weak role. Room temperature, the tungsten can be quickly dissolved in the mixed acid of hydrofluoric acid and concentrated nitric acid, but does not work in the alkali solution. Air conditions, the molten alkali tungsten oxide into the tungstate in the presence of oxidants (NaNO3, NaNO2, potassium chlorate, PbO2 by) generated tungstate reaction is more violent. High temperature with chlorine, bromine, iodine, carbon, nitrogen, sulfur compounds, but not with the hydride.

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 .

Tungsten and Molybdenum for Sapphire Growth Furnace

Products made of tungsten and molybdenum are the main material for sapphire growth furnace. The products of tungsten and molybdenum are made of the material of tungsten and molybdenum whose purity are over 99.95%. They include tungsten crucible, tungsten plate, tungsten sheet, tungsten wire, tungsten electrode screen and molybdenum crucible, molybdenum plate, molybdneum sheet, molybdenum heater, molybdenum holder and molybdenum electrode screen. Besides the pure tungsten and molybdenum products, tungsten rhenium wire is also a main product for the application of sapphire growth furnace.

The color of tungsten and molybdenum for sapphire growth furnace are grey. Tungsten is widly used as parts of sapphire growth furnace for its unique properties, such as high density, small volume, excellent hardness, superior wearing resistance, high ultimate tensile strength, high ductility, high temperature resistance, high radiation adsorption capability, etc. Molybdenum products also have similar properties, such as high denshity and high melting point.

Sapphire growth furnace is a production proven system that produces high quality boules of exceptional crystal for the industry of LED. This furnace has been a increasing demand system for the high volume sapphire producers. One of the main reason is the fast increasing requirement of LED. In the system of sapphire growth furnace, tungsten and molybdenum products are the most choice for the sapphire growth, or crystal growth.

Tungsten and molybdenum for sapphire growth furnace composed lots of parts. Tungsten products for sapphire growth furnace includes tungsten crucible, tungsten crucible cover, tungsten bracket, tungsten heat shield, tungsten electrode screen, tungsten heater, tungsten wire heater and tungsten rhenium. As for molybdenum products for sapphire growth furnace, they consists of molybdenum cover, molybdenum barrel screen, molybdenum crucible, molybdenum boat, molybdenum heat shield, molybdenum bracket, molybdenum thermal field, molybdenum heating furnace, molybdenum hook, molybdenum mandrel, molybdenum stream mouth and molybdenum seed chunk. These mentioned products are parts of sapphire growth furnace. There are some other designed tungsten and molybdenum for sapphire growth furnace provided by Chinatungsten Online.

Tungsten crucible and molybdenum crucible are main products for sapphire growth. Tungsten and molybdenum crucible are used as heating element in the process of sapphire crystal growth. For the property of high melting point of tungsten crucible and molybdenum crucible, tungsten and molybdenum are better choice for the sapphire growth for they will not melt with the crystal and can assure the prurity and high quality of the crystal, which can be produced high qualtiy LED material.

The best manufacturing technique of tungsten and molybdneum products are sintering ones for they own the property of high quality and reasonable price.

The sapphire is one of the three gem-varieties of corundum, the other two being ruby -- defined as corundum in a shade of red—and padparadscha—a pinkish orange variety. Although blue is their most well-known color, sapphires may also be colorless, and are found in many colors including shades of gray and black.

molybdenum crucible

The cost of natural sapphires varies depending on their color, clarity, size, cut, and overall quality – as well as their geographic origin. Significant sapphire deposits are found in Eastern Australia, Thailand, Sri Lanka, Madagascar, East Africa, and in North America in a few locations, mostly in Montana.Sapphire and rubies are often found together in the same area, but one gem is usually more abundant. Color in gemstones breaks down into three components: hue, saturation, and tone. Hue is most commonly understood as the "color" of the gemstone. Saturation refers to the vividness or brightness or "colorfulness" of the color, and tone is the lightness to darkness of the color. Blue sapphire exists in various mixtures of its primary (blue) and secondary hues, various tonal levels (shades) and at various levels of saturation (vividness).

Using tungsten and molybdenum products to produce sapphire is called prefabricated mehod, and this method can also produce high qualtiy sapphire, but also cost effecticve.

If there is any other question refer to tungsten and molybdenum for sapphire growth furnace, please feel free to contact us through the following methods.

Email: sales@chinatungsten.com
Tel.: +86 592 512 9696/ +86 5925129595
Fax: +86 5925129797

Molybdenum Barrel Stove Screen and Sapphire Dan Changjing

Molybdenum barrel screen, is a molybdenum heat shield, because riveted into the barrel of the name. Our company has long engaged in the research, development and production of industrial furnaces with a full set of equipment, including molybdenum wire heating element, molybdenum heat shield carrier molybdenum crucibles and thermal field supporting parts, with a powder-pressure, sintering, forging, rolling to the deep finish a full set of production and processing equipment, and skilled production process.

molybdenum-barrel-screen-sapphire-growing-furnace

In recent years, with the rapid development of LED industry, the company has increased the corresponding Sapphire Dan Changjing furnace product development and production, but also for the corresponding production equipment for the large-scale investment from large isostatic presses , the next intermediate sintering furnace to finishing packing large lathes.

Heat shield riveted molybdenum, molybdenum wire, molybdenum sets of rods connected and fixed.

Sapphire Dan Changjing Furnace Tungsten And Molybdenum Products

Pure tungsten and molybdenum products as an important material for sapphire growth furnace. Sapphire Dan Changjing furnace tungsten and molybdenum products mainly purity higher than 99.95% of tungsten and molybdenum raw materials from the production of products, including tungsten crucible, tungsten plate, tungsten sheet, tungsten wire, tungsten electrode screen, tungsten and tungsten cylinder compartment heat shields and molybdenum crucible, molybdenum heat shield, molybdenum heating element, molybdenum thermal field, molybdenum and molybdenum electrode support frame screens. In addition to tungsten and molybdenum products, the tungsten-rhenium wire is sapphire furnace required a product.

Sapphire Furnace tungsten products are steel gray to tin white hard metal, very pure tungsten can see-saw sawing (pure tungsten is very brittle and difficult to process). Tungsten processing means are forging, tensile and impact. In all the highest melting point of tungsten metal for 3415 ℃, the lowest vapor pressure at the highest tensile strength (1650 ℃ when). Corrosion performance is very good, most of the erosion of its small inorganic acids. In the air to form a protective surface oxide, but will be completely oxidized at high temperature. Molybdenum product is high temperature, high melting point refractory metal.

Sapphire growth furnace designed to nurture through Kyropoulos sapphire single crystal . This method is the tungsten crucible by the raw materials ( alumina ) was heated to its melting point of 2050 ° C or more, and then gradually reduce the melting temperature and allowed to crystallize into a specific granules . The growing furnace in a heat-insulating casing with a special lid closed and the heater constructed in crystallizer . Therefore appeared Sapphire tungsten and molybdenum products Dan Changjing furnace .

Crystal growth furnace is an important carrier of tungsten and molybdenum crucible . Using iridium crucible generally iridium crucible itself is the heat generator , but using tungsten, molybdenum crucible is less used crucible itself do heat . Ikal-200 type crystal growth furnace , tungsten crucible , molybdenum crucible , molybdenum heat shield , tungsten heating body , volatilized at high temperatures molybdenum and tungsten atoms. Of course, tungsten , molybdenum crucible itself is not doing no heating element , is relative , process selection and temperature field settings are very critical factor . Different crystal growth method using the crucible will be different, such as the Kyropoulos (KY) Average of tungsten crucible , heat exchange method (HEM) generally used molybdenum crucible , because the heat exchange last to fall through to take a single crystal , and the molybdenum crucible cheapest price . According crucible manufacturing process, can be divided into pressed and sintered crucible and the crucible spinning , pressed and sintered crucible of lower quality , purity, low density , relatively short life , the price is relatively cheap ; spinning crucible of higher quality, purity , density higher , longer service life , high price. Domestic crystal growth furnace is generally used to suppress sintering crucible .

tungsten and molybdenum for sapphire growth furnace

The chemical composition of the sapphire crystal alumina (α-Al2O3), is composed of three aluminum atoms and two oxygen atoms covalently type combination , the crystal structure of hexagonal crystal structure , as 2,3,4 shown . In terms of color , pure alumina is rendered transparent and colorless crystals , because of different color element ion penetration in the growing sapphire , thereby sapphire show different colors. In nature, when grown as sapphire crystal containing titanium ions (Ti3 +) and iron ions (Fe3 +) , makes the crystals appear blue , and become blue sapphire (Sapphire). When a crystal containing chromium ion (Cr3 +) , makes the crystal appear red, and a ruby (Ruby). And when the crystal containing nickel ions (Ni3 +) , the cause is yellow crystals , which become yellow sapphire . Table 1 lists the characteristics of sapphire table . For growing sapphire sapphire crystal growth furnace is affecting the quality of the key.

Tungsten and molybdenum products are suitable Sapphire Dan Changjing key carrier. Using tungsten and molybdenum as a material , can effectively protect the purity sapphire as tungsten and molybdenum are high temperature refractory metal , not react with sapphires .

Sapphire Overcapacity

October 2012,Nanjing High Accurate Drive Equipment Manufacturing Group Co., high-brightness LED sapphire substrate project groundbreaking . Project a fixed asset investment of 10 billion yuan, the construction scale of not less than 160 Taiwan Sapphire Dan Changjing furnace, within two years of production.

Optical crystal (SZ.002273) report, the company at the end of 2010 the project started to invest in LED sapphire substrate , the current form sapphire flat monthly production capacity of 200,000 pieces , sapphire PSS monthly production capacity of 50,000 scale.

Sanan Optoelectronics Crystal Ann 's Optical Co., Ltd. , Fujian Anxi County in the construction of industrial projects LED sapphire substrate , recently also started mass production . Projects a total investment of 2.538 billion yuan , the construction period of three years, the project introduces crystal growth furnace 410 Taiwan ( sets ) and other related process equipment, designed annual production capacity of sapphire substrate 12 million.

Sapphire Dan Changjing furnace

Founded in November 2010 in Guizhou Haotian Optoelectronics is planning to fully completed by the end of 2014 , after the completion of an annual output of 30 million LED sapphire substrate material scale.

And just this month , another listed company Tiantonggufen (SH.600330) passed the " on the company to target specific non -public offering plan of the motion ," the company intends to invest an annual fund-raising through the issuance of 1,150,000 4 inches LED sapphire substrate material technology projects and supplement working capital.

GLII statistics show that only 2011 new LED sapphire substrate Dan Changjing and the number of projects reached 26 , as of the end of the third quarter of 2012 the number of new projects is 14 . Currently under construction Sapphire Dan Changjing project about two inches capacity sapphire substrate 100 million years , and the current actual market demand is just over 1000 million. Some of the epitaxial enterprises in the use of imported products , so the domestic severe overcapacity sapphire substrate.

"Now the sapphire substrate serious excess capacity , the price is low , many companies have slowed down the progress of investment expansion , direct impact on the sales of crystal growth furnace ." When asked about last year's sales situation, the crystal growth furnace company official said.

"Customer sign a long single more, supply and demand situation has improved ." Tiantonggufen Marketing Director Guoyue Bo said that , since opening orders improved, the amount of customer orders plus trend. The next three months sales and prices are on the rise . Insiders said that the downturn in the sapphire substrate prices are now so many companies lose money , are hoping this year epitaxial wafer fab capacity utilization can be improved, driven by a sapphire substrate sales and prices rise. But this year a good start can be maintained long , is a known issue.

LED Sapphire Substrate Domestic Overcapacity Crystal Growth Furnace Caught "Survival Technique"

" One side is GT, ARC and other foreign manufacturers of extrusion, the other side is the sapphire substrate excess capacity, demand, prices have been falling , domestic manufacturers of crystal growth furnace is now survive in the cracks , and development ." Domestic Sapphire furnace Dan Changjing a company official told the " Engineering LED" reporter .

"As of now , the company's Sapphire Dan Changjing furnaces sold dozens ." This is the Dragon Optical (SZ.300029) interactive platform for investor relations in the Shenzhen Stock Exchange on the answer given .

Sapphire Dan Changjing furnaces

According to Engineering LED Industry Institute (GLII) recently released report, 2012 China mainland chip output of about 7.2 billion yuan , the average price fell about 32% , a decline of some products is as high as 50% .

GLII data show that in 2012 China mainland holdings from 2011 's 803 units to 917 units, but the capacity utilization rate is only about 30%, the boot was only about 50%.

Low capacity utilization led directly upstream sapphire substrate and Sapphire Dan Changjing furnace corporate sales slump last year , the price all the way down . Currently , two-inch sapphire substrate market price has reached a cost of $ 7-8 near the line , more manufacturers in Taiwan and South Korea call for $ 6 of the "cheap ."

Domestic Price To Fight Sapphire Dan Changjing Furnace Volume, Boom Shall Support Downstream

Domestic Price To Fight Sapphire Dan Changjing Furnace Volume, Boom Shall Support Downstream

According to Engineering LED Industry Institute (GLII) statistics show that despite the current low price of the sapphire substrate is in the domestic investment projects sapphire dan changjing expansion boom is beginning to become more rational , but crystal growth furnace equipment investment enthusiasm seems seem not to cool down. Only in the past in 2011, there are more than ten domestic businesses to invest in developing crystal growth furnace equipment , some of which have already received orders manufacturers is mass production.

Recently,the Taiwan subsidiary of Taiwan sapphire dan changjing manufacturers ACME poly-called photoelectric successfully developed the largest in Asia , 120 kg class sapphire dan changjing furnaces. Company official said that the magnitude of the crystal growth furnace can significantly reduce production costs, and is suitable for 6 inches above the ingot production.

And just two weeks ago , Jiangsu Shuangliang Group Ltd. said the company introduced sapphire dan changjing Ukraine Lancey nous furnace technology company , has completed the digestion and absorption , is expected to 85kg sapphire dan changjing furnace after the Spring Festival will be held in 2012 market.

According to Engineering LED reporter, before the market can be used to supply the production of LED sapphire dan changjing furnace , mainly GTAT 100 kg class crystal growth furnace , USA TT's 90 kg class crystal growth furnace , ARC-energy of 30 kg grade crystal growth furnace as well as Russia 's 35 kg class crystal growth furnace.

As previously sapphire crystal rod has appeared worldwide overcapacity alarms , plus domestic sapphire crystal rod maker continues expansion, resulting in two -inch sapphire substrate prices over the past one-year period from a high of 35 dollars plunged below $ 10 .

In comparison,the current market price of the sapphire substrate 4 inches case is obvious, because more than 60 kilograms of crystal growth from the stick and cut out four inches and above the technical difficulty of the substrate is still high , so the price range is limited.

Sapphire Dan Changjing Furnace

Meanwhile,in addition to Europe, America and Taiwan, some manufacturers in mass production 4 inches and above epitaxial wafers , the extension of domestic manufacturers is 2 inches basically still dominated . According to the reporter , now 4 inches sapphire substrate prices still maintain a level of about 50 dollars , taking into account the gradual opening up of large-size manufacturers epitaxial production process,sapphire dan changjing manufacturers also can speed up deployment of large kg class product line.

Sapphire Dan Changjing Furnace Hot Zone

Sapphire Dan Changjing Furnace Hot Zone

Sapphire (Sapphire) is an aluminum oxide (Al2O3) single crystal, the optical penetration with a very wide, from near-ultraviolet light (190nm) to have a mid-infrared

Sapphire has good light transmittance. Sapphire crystal has excellent optical properties, mechanical properties and chemical stability, high strength, hardness, corrosion resistance, high temperature 2000 ℃ in proximity to work under harsh conditions, they have been widely used in military infrared devices, satellite space technology, high-intensity laser window material. Its unique lattice structure, excellent mechanical properties, good thermal properties make sapphire crystal as the practical application of semiconductor GaN/Al2O3 light-emitting diode (LED), LSI SOI and SOS and nanostructured superconducting films such as the most ideal substrate material. With the recent LED TV, LED Monitor, LED NB, LED Phone and LED lighting market continues rapid growth, a strong impetus for the production of LED sapphire substrate market demand expansion.

Benefits：

The production technology is mature sapphire substrate, the device of good quality
Sapphire good stability, can be used in high-temperature growth process
Sapphire has high mechanical strength, ease of handling and cleaning

Common Crystal Growth Method:

Czochralski Method (Czochralski crystal pulling method, also called Czochralski method): Pull from the melt.
Kyropoulos Method (Kjeldahl crystal growth method, also known as Kyropoulos): Dip and turn.

Temperature gradient technique (TGT France)

EFG Method (guided mode method, Edge Defined Film-fed Growth): Pull through die.
Heat exchange method (Heat Exchange Method, HEM)

Sapphire Dan Changjing Furnace

Vertical and horizontal temperature gradient cooling method (Vertical Horiaontal Gradient Freezing, VHGF): Korea Sapphire Technology Company (STC) technology.
ES2-GSA crystal growth method: American Rubicon Technology Inc. Technologies.
Since tungsten and molybdenum has a high temperature, low pollution and other characteristics, are widely used to make sapphire dan changjing furnace hot zone components, including tungsten crucible / molybdenum crucible, heating element, tungsten tube, heat shield, support, base, seed rod , the crucible cover. Heating element cage structure using tungsten or tungsten mesh heating element heating element, help provide uniform and stable temperature field.

TLWM to provide customers with quality 30Kg, 60Kg, 85Kg, 120kg full sapphire dan changjing furnace thermal field and thermal field of tungsten and molybdenum components.