Tungsten Crucible for Sapphire Growth Furnace

Tungsten crucible and related tungsten thermal system for sapphire growth furnace owns the properties of high density, high purity and high processing accuracy. Tungsten crucible for sapphire growth furnace is made of the material of pure tungsten, whose purity is over 99.95%, and the density is about 18.2g/cm3.
The manufacturing techniques of tungsten crucible for sapphire growth furnace are sintering, metal forming, spinning type, the use of molybdenum rod turning molding, or welding of a variety of pure tungsten plates, tungsten plates and pure tungsten rod. The tungsten crucible can be used under the high temperature of 2600 degree.

Tungsten crucible is also used in sapphire growth furnace is mainly because of the properties of tungsten, which are high boiling point, high melting point, thigh temperature resistance, high corrosion resistance,low thermal expansion coeffient, and high thermal conductivity. Besides tungsten crucible for sapphire growth furnace, tungsten crucible is also used in metallurgy of rare earth, ion plating and quartz glass.

It is because of the properties of tungsten crucible that tungsten crucible is chose as one important part in the process of growing sapphire crystal. Under high temperature, tungsten crucible will not react with Al2O3, so that the purity of sapphire crystal can be assured.


If there is any other question refer to tungsten crucible 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

Doped Tungsten Wire Comparison

Doped tungsten wire lengthy production processes, including tungsten metallurgy, powder metallurgy and metal forming system of billet main stage.

Advantages of doped tungsten wires

W31: W31 wires are standard doped tungsten wires with excellent non-sagging properties.

W91: W91 wires are non-sagging wires developed for higher-temperature use than W31 wires. They are suitable for halogen lamp filaments. Doped tungsten wire has higher non-sagging properties by maintaining inter-granular strength and suppressing void production at elevated temperatures by reducing the impurities content using our own technology.

If there is any question or requirement on doped tungsten wire, please feel free to contact us through the following methods.

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

Doped Tungsten Wire

Doping in blue tungsten oxide or tungsten oxide mixed with trace K2O, Al2O. And SiO2. Doped tungsten wire, performance is better than ordinary tungsten wire, widely used in microwave ovens, television , welding materials, special lighting.

Adding tungsten rhenium can significantly improve the ductility (plastic ) and recrystallization temperature. Some tungsten rhenium alloy after appropriate annealing treatment, the extension rate of 5% , much higher than pure tungsten higher. Adding Tungsten thorium oxide (ThO2) the formation of tungsten thorium alloy with high thermal electron emission ability, can be used as hot cathode tube, welding electrodes, but the long-term radioactive ThO2 not been resolved.
If there is any question or reuirement on doped tungsten wire, please feel free to contact us through the following methods.
Emai: sales@chinatungsten.com
Tel.: +86 592 512 9696
Fax: +86 592 512 9797

Stranded Tungsten Wire

Stranded tungsten wires element features high melting point and high corrosion resistance, mainly applied for aluminizing kinescope, chromo scope, mirrors, plastics and heater elements for decoration articles, Stranded tungsten wire is applied for making heater elements and other heater components in semiconductor and vacuum devices.

Stranded tungsten wire whose Surface is chemical cleaned or electrolytic polished has high temperature melting point, high corrosion resistant and long life. The density and purity of stranded tungsten wire is respective 19.3g/cm3 and 99.95%min.

Applications:
1)Vacuum metalized applicant
2)Aluminum spraying,ceramic coating, metal, plastic
3)For aluminizing of chromo-scope & kinescope

4)For mirror making

More information required of stranded tungsten wire, please feel free to contact us by email sales@chinatungsten.com.

Application of Non-sag Tungsten Wire

Car and motorbike lamps are one of the most important applications of non-sag tungsten wire. When used non-sag tungsten wire as filament in such bulbs, the wire can have the most effective effects for the cars and motorbikes to achieve stable light from the lamps. The application in incandescent lamps has the same effects.

If you have any question or requirement on tungsten wire, including non-sag tungsten wire, please feel free to contact us.

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

Non-sag Tungsten Wire

Definition of non-sag tungsten
Non-sag tungsten is tungsten doped with the element of K (potassium) or other elements to achieve the effect of non-sag of the tungsten wire. Doping with K can form bubbles in tungsten wire, which can prevent the recrystallization of the tungsten wire. And they are also responsible for their outstanding low resistance of non-sag tungsten at high temperatures of a glowing lamp filament. About 90% of non-sag tungsten is used in incandescent lamps.

Definition of non-sag tungsten wire

Non-sag tungsten wire is applied the material of non-sag tungsten so that the tungsten wire shares the properties of non-sag tungsten. They can be less shakable when used in light sources or heating elements for the dopant material used in non-sag tungsten wire.

If you have any question or requirement on tungsten wire, including non-sag tungsten wire, please feel free to contact us.

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

Tungsten Rhenium Wire

Tungsten rhenium wire is used for heating elements in high temperature furnaces, thermocouples and in electronics. Its advantage is its ability to maintain greater ductility compared to tungsten after exposure to extremely high temperatures.Tungsten wire has fiber structure, when the temperature reaches 1500-1600 ℃, the tungsten filament would turn, and cause high-temperature sag. To improve the quality of tungsten wire, it is always mixed some additives during sintering procession, such as Na2O, K2O, SiO2, ThO to enhance the capacity of high-temperature creep resistance and high temperature anti-sag of tungsten wire. In order to improve the tenacity of tungsten wire and prevent the deformation under high temperature, it usually added some oxides, such as silica, alumina, potassium and so on.

Tungsten rhenium wire is the most common material used to produce heaters for dispenser cathodes. Performance variation may be attributable to a range of factors, including cold work and rhenium content variation.

Why mix rhenium into tungsten?

Rhenium significantly reduces the brittle characteristics of tungsten at room temperature. What is more, the addition of rhenium increases the recrystallization temperature, the ductility, and the ultimate tensile strength of these alloys and decreases the ductile-brittle transition temperatures of tungsten-rhenium alloys.

If you have got any other requiry of tungsten rheniu wire or there is any other question, please feel free to contact us through the following information:
Email:sales@chinatungsten.com
Tel.: +86 592 512 9696
Fax:+86 592 512 9797