The raw materials of three-layer composite tungsten contacts:
The surface material of tungsten contacts can be pure tungsten, silver, copper, silver nickel, silver tin oxide, silver oxide cadmium and so on;
The substrate of tungsten contacts may be nickel, iron, copper, silver, silver alloy and stainless steel and so on;

Specifications
The thickness of the surface material is between0.03mm and 1.0mm;
The thickness of the substrate is between 0.08mm and 3.5mm;

Application
They are mainly used in thermostats, relays, micro-switches and circuit breakers and so on.

Advantage
The welding surface of three-layer composite tungsten contacts are nickel, iron, copper and other materials, in order to increase its welding ability, there is also a pad on the top. Jointed the welding parts by melt metal, which is Cu with stable electrical performance and low contact resistance, so their positioning is easy, their welded portions are more beautiful and environment friendly, the required heating time is shorter and so on.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Specification of tungsten points:
Rivet-type tungsten points processed by riveting and its continuous automatic production can be realized. Besides, they are usually applied in relay, 3C appliances, small appliances, communications relay, various types of switches, traditional breaking switch and so on;
Button-type tungsten points processed by welding and its continuous automatic production can also be realized.
Button-type tungsten points are widely used as breaker points, protection points, temperature breaking switch points, and various switching points for conducting and breaking contact, etc;

Dimension range:
The diameter of tungsten points is between 0.6mm and 10mm, its diameter of line is between 0.6mm and 4.0mm, and its silver layer thickness is between 0.15mm and 2.0mm.

The raw materials of tungsten point surface are silver, silver nickel, silver copper, silver cadmium oxide, silver indium tin oxide, silver tin oxide and silver zinc oxide. Besides, its line materials can be made or be imported;
The substrate of tungsten points: copper, copper nickel and so on.
Tungsten points can plate silver, gold, nickel and so on;

Rivet-type and button-type tungsten points have the advantage of lower resistance, lower cost, easier processing and so on.


 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Tungsten contacts’ specification types and applications:

Rivet-type tungsten contacts:
Prepared by riveting;
It can realize continuous automatic production;
Rivet-type tungsten contacts are typically used for communications relay, relay, small appliances, 3C appliances, traditional breaking switch, various types of switches and so on;

Button-type tungsten contacts:
Prepared by welding;
It can also be suitable for continuous automatic production;
Button-type tungsten contacts are commonly used in temperature breaking switch contacts, circuit breaker contacts, protection contacts and various switching contacts for conducting and breaking contact, etc;

Size range:
Contacts diameter: 0.6 ~ 10mm, diameter of line: 0.6 ~ 4.0mm, silver layer thickness: 0.15mm ~ 2.0mm.

Contacts surfaces are silver copper, silver nickel, silver, silver zinc oxide, silver cadmium oxide, silver tin oxide and silver indium tin oxide, and line materials not can be made but also be imported;
The substrate of tungsten contacts are copper nickel, copper and so on. And they can electroplate gold, silver, nickel and so on;

Rivet-type tungsten contacts and button-type tungsten contacts possess lower cost, low resistance, easier process and wide application and so on.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Specification of tungsten points:

Tungsten points possess circular type, rectangular type, square type, prismatic type and so on.
There are a lot of contact materials, such as, silver tungsten carbide, copper tungsten, tungsten iron, pure tungsten, silver nickel, silver graphite, silver tungsten, and silver metal oxides and so on;
Sheet thickness: 0.5mm - 3.0mm;
Sheet length: 3.0mm - 25.0mm;
Sheet width: 3.0mm - 20.0mm;
Tungsten points diameter: 2.0mm - 25.0mm;
(other specifications are also available according to customer’s requirements)
Advantages of tungsten points prepared by powder metallurgy:
High density;
Better average size;
Good particle uniformity;
High pressure resistance;
Anti current corrosion;
High purity of tungsten powder particles;
The advantage of tungsten points may almost exploited in the process by
adding a certain ratio of rare earth elements.


 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Contact materials have pure tungsten, silver nickel, silver tungsten, copper tungsten, tungsten iron, silver graphite, silver tungsten carbide and silver metal oxides and so on;
The specification type of tungsten contacts own square type, rectangular type, circular type, prismatic type, etc. (other types are also available according to customer’s requirements);
Sheet thickness is between 0.5mm and 3.0mm; length is between 3.0mm and 25.0mm; width is between3.0mm and 20.0mm;
Contacts diameter is between 2.0mm and 25.0mm;

Advantages of tungsten contacts made by powder metallurgy

Advantages of tungsten contacts made by powder metallurgy lie that high purity of tungsten powder particles, good particle uniformity, better average size and high density, in the process, by adding a certain percentage of rare earth elements, tungsten contacts’ advantages (such as, welding, high pressure resistance, anti-current corrosion, etc.) can almost playing out.


 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Tungsten points features

Impact toughness is nice;
Thermal expansion coefficient is small;
Purity is high: more than 99.95%;
Roughness is high: higher than 71 and lower than 74HRA;
Density is high: between 19.1g / cm³ and 19.3g / cm³;
Vapor pressure is low and evaporation is slow;
With excellent corrosion resistance;
Owning good flatness, roundness and concentricity;
Arc-erosion resistance performance is nice and stable;
Section grain fiber is short;
Interrupting current capability is better;
Rod surface is smooth and there are no cracks and scratches;
The box used to contain tungsten points should be reinforced and waterproof paper need be laid at the bottom of the box.
In transit, you should keep tungsten points from violent impact, corrosion, snow and acid rain.
The storage of tungsten points must be dry and be free of corrosive gases.


 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Tungsten contacts have the following features:
Good impact toughness;
Small thermal expansion coefficient;
High purity: ≥99.95%;
High density: 71-74HRA;
High density: 19.1g / cm³-19.3g / cm³;
Low vapor pressure, slow evaporation;
Excellent corrosion resistance;
Good roundness, concentricity and flatness;
Nice and stable arc erosion resistance performance;
Shorter section grain fiber;
Better interrupting current capability;
Smooth rod surface, without cracks and scratches;
Box used to hold tungsten contacts need to be reinforced and in which put waterproof paper;
Tungsten contacts in transit should prevent violent impact, corrosion and acid rain and snow;
Tungsten contacts storage location should be dry and without corrosive gases.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Bis (butyl cyclopentyl) tungsten dibromide formula is C18H26Br2W, molecular weight of 586.05 and a melting point (under normal pressure) is 112-116 ℃. Besides the system CAS number of bis (butyl cyclopentyl) tungsten dibromide is 90023-17-9. It is stable at room temperature and atmospheric pressure, but to avoid contact with strong oxidants. To be stored in a cool, dry place and keep it into the storage container. There are some synonyms of bis (butyl cyclopentyl) tungsten dibromide which is double (butylcyclopentadienyl) tungsten, bis (butylcyclopentadienyl) tungsten dibromide. In the operation should to wear protective goggles and gloves and other protective equipment to avoid contact with the product to irritation the skin and eyes.

Tungsten Manufacturer & Supplier: Chinatungsten Online -http://www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

 

Tungsten dibromide is a black powder and formula is WBr2, molecular weight of 343.66. It is unstable and susceptible to oxidation, easy to produce octahedral groups. Polymer W6Br12 easily oxidized to high valence tungsten oxide, but heating it will back into W6B12.  Besides system CAS No. is 13470-10-5.
Producing tungsten dibromide three methods as follow shown:
1. Under 400-500 ℃ heating conditions, using hydrogen to restore tungsten pentabromide to generate tungsten dibromide.
2. Under 400-450 ℃ condition, disproportionation by tungsten tetrabromide to obtain.
3. Producing crude tungsten dibromide by borosilicate glass tube and then putting it into high silicate heat resistant tubes were heated at 600 ℃ for several minutes to remove volatile impurities appears to the producing process to obtain pure tungsten dibromide.

Tungsten Manufacturer & Supplier: Chinatungsten Online -http://www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

 

Tungsten dioxydibromide (WO2Br2) is a purple-brown solid deliquescent prismatic crystal. Tungsten dioxydibromide can produce by mixed a certain stoichiometric tungsten powder, tungsten oxide and bromine to obtain.
Synthesis tungsten dioxydibromide processes as follows:
1. The mixture which consists of 2.758g (15mmol) tungsten powder, 6.956g (30mmol) tungsten oxide and 7.192g (45mmol) bromine with stoichiometry was placed in a reaction tube, putting 2mg of bromine in the tube to prevent generate low-cost tungsten bromide and tungsten bromide oxide and bromine in the reaction.
2. The reaction tube was melted under vacuum seal, and placed in a temperature gradient of 400/40 ℃ was heated until the bromine totally reacted, after preheating, putting the reaction tube  in the temperature gradient of 450/325 ℃ was heated 15h .
3. To sublimation purification the crude product for a second time.
4. To separate off more volatile impurities WOBr4 and WBr5 then can get pure crystalline tungsten dioxydibromide.
During synthesis tungsten dioxydibromide when use bromine or iodine need to preheat the reactants in order to prevent the tube explosion, because there is a higher pressure of halogen partial. And during the heating period, only put the end which containing a mixture of tungsten powder and tungsten oxide into the oven until the elemental halogen exhausted to generate a high halide and halogen tungsten oxide so far.

Tungsten Manufacturer & Supplier: Chinatungsten Online -http://www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn