Cerium Tungsten Bar
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- Category: Tungsten Information
- Published on Tuesday, 27 January 2015 08:48
- Written by Sherry
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Cerium:
Cerium is the most abundant of the rare earth elements, making up about 0.0046% of the Earth's crust by weight. It is found in a number of minerals, the most important being monazite and bastnasite. Commercial applications of cerium are numerous. They include catalysts, additives to fuel to reduce emissions and to glass and enamels to change their color. Cerium oxide is an important component of glass polishing powders and phosphors used in screens and fluorescent lamps. It is also used in the "flint" (actually ferrocerium) of lighters.
Cerium Tungsten Bar
Appearance: Grey or dark grey with metallic glazing on surface.
Application: Widely use for anti-shock lamp wire, energy saving lamp wire, common lamp wire and electrode material.
|
Code |
Size of blanks (mm) |
Density (g/cm3) |
Grain Quantity (g/mm2) |
Applications |
|
WCe10 |
φ15x300 |
≧17.2 |
≧3000 |
Apply for electrode material for argon arc welding and plasma cutting |
|
WCe20 |
φ10x680 |
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Lanthanum Tungsten Bar
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- Category: Tungsten Information
- Published on Monday, 26 January 2015 09:17
- Written by Sherry
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Lanthanum :
Lanthanum is a malleable, ductile, and soft metal that oxidizes rapidly when exposed to air. It is produced from the minerals monazite and bastnäsite using a complex multistage extraction process. Lanthanum compounds have numerous applications as catalysts, additives in glass, carbon lighting for studio lighting and projection, ignition elements in lighters and torches, electron cathodes, scintillators, and others. Lanthanum carbonate (La2(CO3)3) was approved as a medication against renal failure.
Lanthanum Tungsten Bar Description:
Characteristic:High quality, workability
Application: as a material for making special steels, etc
Chemical Composition: tungsten+lanthanum
Surface: grinding, cleaning, forging
Purity: W>99.50%
Density of tungsten bar:19.2g/cm3
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Silver Tungsten Bar
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- Category: Tungsten Information
- Published on Thursday, 22 January 2015 09:12
- Written by Sherry
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Silver tungsten bar is used for electrical contacts. Typically they are used in heavy duty devices subject to high currents. The presence of the refractory material tungsten reduces the chances of welding and improves resistance to arc erosion. Optimal compositions are found by balancing conductivity and non-welding properties.
Silver tungsten bar-AgW75 is one of the high refractory content tungsten-silver materials made by press-sinter-infiltration and normally a high resistance to arc erosion. It is generally used as arcing contacts in large air and oil circuit breakers, line disconnects, re-closures, and in high current switches and contactors. Contact resistance is low enough to protect the higher conductivity current carrying contacts from arc damage. Its resistance to welding makes it a good shorting contact for bimetal protection in circuit breakers.
Silver tungsten bar AgW70 and silver tungsten bar-AgW50 have more silver than Silver tungsten bar-AgW75, which provides higher conductivity and a lower contact resistance. They are used extensively in a large variety of circuit breakers. In this application, a single pair of contacts provides the dual function of carrying the current without overheating, and interrupting the current without excessive arc erosion. They are also used in high current contactors where resistance to contact welding and arc erosion are required. In a variety of DC applications, they offer resistance to metal transfer.
Silver tungsten bar-AgW50 has the highest silver content of the press-sinter-repress tungsten-silver materials. It exhibits good resistance to contact welding and is used for current carrying contacts in power circuit breakers that encounter high momentary currents.
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Silver Tungsten Bar Physical and Mechanical Properties
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- Category: Tungsten Information
- Published on Friday, 23 January 2015 09:04
- Written by Sherry
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|
Composites |
Nominal Composition |
Density |
Electrical Resistivity |
Electrical Conductivity |
Hardness |
Bending Strength |
|
AgW50 |
50 Silver |
13.15 |
3.0 |
57 |
105 |
--- |
|
AgW55 |
45 Silver |
13.55 |
3.2 |
54 |
115 |
--- |
|
AgW60 |
40 Silver |
14.00 |
3.4 |
51 |
125 |
--- |
|
AgW65 |
35 Silver |
14.50 |
3.6 |
48 |
135 |
--- |
|
AgW70 |
30 Silver |
14.90 |
3.8 |
45 |
150 |
657 |
|
AgW75 |
25 Silver |
15.40 |
4.2 |
41 |
165 |
686 |
|
AgW80 |
20 Silver |
16.10 |
4.6 |
37 |
180 |
726 |
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Applications for Copper Tungsten Bar-2
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- Category: Tungsten Information
- Published on Wednesday, 21 January 2015 09:10
- Written by Sherry
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3. High-voltage discharge tube electrode
When the high-voltage vacuum discharge tube is working, the temperature of contact material will rise to thousands degree centigrade within several tenths seconds. High ablation resistance, high toughness, good electrical and heat conductivity of Copper tungsten provide necessary conditions to stable operation of the discharge tube.
4. Electrical seal material
It owns not only the low expansion of tungsten and high heat conductivity of copper. Its expansion index and heat conductivity can also be changed through changing the content of the materials, which provides convenience to the using of the material. We can supply various specifications and the Copper tungsten alloys with different tungsten proportions.
Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-alloy.com
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