Tungsten Contact with Iron Leg

Tungsten contact showed above is made of tungsten disc with iron leg.
Tungsten contact is widely used in electric industry.
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Hardness Testing

Machine for testing hardness.
Machine for testing hardness can test tungsten rod, tungsten bar, tungsten disc and other shapes.
The above data is to show the hardness of pure tungsten rod.
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Tungsten Disc with Center Hole

Tungsten disc with center hole is swaged and forged to a density over 19.1g/cm3.
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Tungsten Crucible for Sapphire Growth Furnace

Tungsten crucible used for sapphire growth furnace, is manufactured from tungsten with purity over 99.95% and density around 18.3g/cm3.
Tungsten crucible could be manufacturing by two methods, one is manufacturing from sintering tungsten, and the other one is made from tungsten bar.
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Tungsten Granule Price in June

Tungsten granule price has been increasing a lot in June. The main reason is that raw material-tungsten powder has been going up greatly since April. Until end of June, the price has been 15% up, compared with price in April.
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New Discovery of Tungsten Related Machine

News of Tungsten from website:

The discovery is also the first demonstration of an "n-type" WSe2 field-effect-transistor (FET), showing the tremendous potential of this material for future low-power and high-performance integrated circuits.

Monolayer WSe2 is similar to graphene in that it has a hexagonal atomic structure and derives from its layered bulk form in which adjacent layers are held together by relatively weak Van der Waals forces. However, WSe2 has a key advantage over graphene.

“In addition to its atomically smooth surfaces, it has a considerable band gap of 1.6 eV,” explained Kaustav Banerjee, professor of electrical and computer engineering and Director of the Nanoelectronics Research Lab at UCSB. Banerjee’s research team also includes UCSB researchers Wei Liu, Jiahao Kang, Deblina Sarkar, Yasin Khatami and Professor Debdeep Jena of Notre Dame. Their study was published in the May 2013 issue of Nano Letters.

“There is growing worldwide interest in these 2D crystals due to the many possibilities they hold for the next generation of integrated electronics, optoelectronics and sensors,” commented Professor Pulickel Ajayan, the Anderson Professor of Engineering at Rice University and a world renowned authority on nanomaterials. “This result is very impressive and an outcome of the detailed understanding of the physical nature of the contacts to these 2D crystals that the Santa Barbara group has developed.”

“Understanding the nature of the metal-TMD interfaces was key to our successful transistor design and demonstration,” explained Banerjee. Banerjee’s group pioneered a methodology using ab-initio Density Functional Theory (DFT) that established the key criteria needed to evaluate such interfaces leading to the best possible contacts to the monolayer TMDs.

The DFT technique was pioneered by UCSB professor emeritus of physics Dr. Walter Kohn, for which he was awarded the Nobel Prize in Chemistry in 1998. “At a recent meeting with Professor Kohn, we discussed how this relatively new class of semiconductors is benefitting from one of his landmark contributions,” said Banerjee.

Wei Liu, a post-doctoral researcher in Banerjee’s group and co-author of the study, explained, "Guided by the contact evaluation methodology we have developed, our transistors achieved ON currents as high as 210 uA/um, which are the highest reported value of drive current on any monolayer TMD based FET to date.” They were also able to achieve mobility of 142 cm2/V.s, which is the highest reported value for any back-gated monolayer TMD FET.

“DFT simulations provide critical insights to the various factors that effectively determine the quality of the interfaces to these 2D materials, which is necessary for achieving low contact resistances.” added Jiahao Kang, a PhD student in Banerjee’s group and co-author of the study.

“Nanoelectronics and energy efficient computing technology are key areas of research at UCSB, fields in which our faculty members are renowned for their achievements. With these results, Professor Banerjee’s team continues to make important research contributions to next-generation electronics,” commented Rod Alferness, Dean of the College of Engineering at UCSB.

Their research was supported by the National Science Foundation, the California NanoSystems Institute at UC Santa Barbara, and the Materials Research Laboratory at UCSB: an NSF MRSEC.

Tungsten Bar Price in End June, 2013

Tungsten bar is mainly used for iron metallury, and the price of tungsten bar in Jun. 2013 has been increasing a lot as for the raw material of tungsten powder has been increasing at least 20% since April. Therefore, tungsten bar price with regular dimensions(15mmx15mmx550mm)has been increasing to RMB340.00/KG EXW, XIAMEN.
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Tungsten Filament with Length

Tungsten filament as above picture is used widely in lamps. The filaments are made with thin tungsten wire and can be manufactured with single spiral or double spiral.
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Stair-like Tungsten Filament

Stair-like tungsten filament is as small as a finger. The legs are looking like as stair.
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Tungsten Filament with Contactor

Filaments with copper heat sink.
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Straightened Tungsten Filament

Straightened tungsten filament is tungsten filament made from tungsten wire and with two straight legs.
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Tungsten Support

Tungsten support is designed as part of lamb to support filament. L shape is the one, which is used most widely.Tungsten support is made of tungsten wire with purity over 99.95% and density around 19.25g/cm3.
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Ion Source Tungsten Filament

Ion source tungsten filament, also named IG tungsten filament, is manufactured from tungsten wire with purity over 99.95%. The wire could be chosen with good properties, which can be working under higher temperature.
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Tungsten Price in June

Tungsten price in June has been continuing the trend in April and May. On Jun. 24, the price has been increasing about 20%, and it would be around 30% going up in the future.
As for the price of raw material, the finished products have been influenced a lot. Including pure tungsten, tungsten alloy and tungsten carbide, the products are encountering the same problem.
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Fitting for Welding Tungsten Granule

Fitting for welding tungsten granule is tungsten granule, which welded on metal part, which is to improve the roughness of metal surface.