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Tungsten Copper Points Density with Ce

Details: Category: Tungsten Information; Published on Thursday, 23 July 2015 17:10; Written by Yahong; Hits: 345

The density of tungsten copper points -Cu20W80, will decline when you add rare earth (Ce)/rare earth oxides (CeO₂) to it. What’s worse, its density declines as the increase of additive amount. In theory, the density of Ce (6.77 g / cm³) and CeO₂(7.10 g / cm³) lower than Cu20W80s’, which is 15.64g / cm³. So, the density of tungsten copper points’ density with Ce will be smaller when the additive amount of Ce or CeO₂ is larger.
The density of tungsten copper points decreases significantly if the amount of Ce is 1%; the density would not decrease substantially if Ce’s amount is from 1% to 3%; the actual density is relatively higher if the density is of 3 %( the optimum amount of Ce).
The density of Cu20W80 declining unevenly, and along with dramatic change trend. With the increase amount of CeO_2,its value reduces significantly. Nevertheless, the density value change relatively flat and upward slightly when its amount is from 5% to10 %. In a word, tungsten copper points with Ce is better, whose optimum addition amount is from 1% to3%.

Tungsten points

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Application of Hydrocarbons in Concealed Tungsten Ore Prediction in Weijia,Nanling Area

Details: Category: Tungsten Information; Published on Thursday, 23 July 2015 17:01; Written by xinyi; Hits: 380

Weijia tungsten ore is located at Xiang Linpu Town, Hunan Province. It is in the Xiang Linpu porphyry groups near the Tong Shanling porphyry. The large skarn type deposit was detected using comprehensive exploration method during the recent exploration activities in China. Being buried deeply in 500mand covered by limestone and thick soil in the surface, it has hardly been indicated by traditional pathfinder elements. It is proved that hydrocarbons promoted the transport and enrichment of elements in the ore forming, so Weijia tungsten ore is taken as a case to study the effect of hydrocarbons to the concealed deposits in coverage area. Acidolysis hydrocarbon of 46rock samples in ZK801and heat release hydrocarbon of 3 soil profiles were analyzed. The results show that the contents of hydrocarbons decrease from porphyry, ore body to wall rock, and the rates of methane, olefins and heavy alkane are different in porphyry, ore body and wall rock. The standard curves shapes of ore are similar to those of the porphyry and wall rock. The soil heat release hydrocarbons show bimodal distribution and low value above the ore body. This study proves that the hydrocarbons are more useful to indicate the concealed mine than the traditional pathfinder elements.

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CaWO4 Crystals Aim to Light Up Dark Matter-I

Details: Category: Tungsten Information; Published on Thursday, 23 July 2015 15:21; Written by xinyi; Hits: 346

German scientists hunting dark matter are set to produce half a tonne of high-purity calcium tungstate for their detectors, one 1kg crystal at a time. The CRESST-II experiment based in Gran Sasso, Italy is currently seeking this enigmatic substance, thought to explain the universe’s structure, with 10kg of calcium tungstate (CaWO4). Now Andreas Erb and Jean-Côme Lanfranchi are preparing crystals for its larger successor EURECA, which will begin operation in the French Alps in 5–10 years.

Gravitational effects suggest as-yet-unobserved dark matter in the universe outnumbers more familiar atomic matter four to one. Erb, Lanfranchi and their colleagues are hunting leading theoretical candidates, Weakly Interacting Massive Particles (WIMPs). That name reflects their size – up to a lead atom’s mass – and the limited interaction with atomic matter that makes them hard to find, or ‘dark’. ‘They have to interact weakly to agree with the matter needed,’ says Richard Gaitskell from Brown University in the US, who isn’t involved in the calcium tungstate experiments.

Erb explains that the detectors should be able to pick up dark matter particles when they hit atomic nuclei in the crystals. ‘A higher sample mass gives a higher probability of such events.’ But distinguishing the miniscule amount of heat WIMP–nucleus collisions would produce requires detectors cooled to 10mK and shielded from ambient radioactivity.

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CaWO4 Crystals Aim to Light Up Dark Matter-II

Details: Category: Tungsten Information; Published on Thursday, 23 July 2015 15:30; Written by xinyi; Hits: 379

CRESST/EURECA is the only team hunting dark matter with calcium tungstate, which has two advantages. Firstly, its different atoms cover a range of possible WIMP masses. No matter the mass, you always have a nucleus with a high probability of interacting,’ Erb says. Second, it would also emit light when a WIMP hits it and monitoring the different signals will help the scientists eliminate background noise.

Having initially purchased crystals, this need for extreme sensitivity drove Erb and Lanfranchi to produce their own. ‘They weren’t pure enough for the background we want,’ Erb recalls. To avoid oxidation at calcium tungstate’s 1600°C melting temperature, the crucibles are made from rhodium, with their 12cm diameter vessel costing €120,000 (£97,300). Erb says that if they can grow two or three 1kg crystals per week then they will have the required amount for EURECA in about five years.

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Polycarbonate–Tungsten Polymer Composite in Three-Dimensional Printing

Details: Category: Tungsten Information; Published on Thursday, 23 July 2015 14:37; Written by wenjing; Hits: 305

Material-extrusion three-dimensional (3D) printing has recently attracted much interest because of its process flexibility, rapid response to design alterations, and ability to create structures “on-the-go”. For this reason, 3D printing has possible applications in rapid creation of space-based devices, for example cube satellites (CubeSat). The polycarbonate–tungsten polymer composite, which is designed for x-ray radiation-shielding applications, had intentionally utilizes low loading levels to provide x-ray shielding while limiting effects on other properties of the material, for example weight, electromagnetic functionality and mechanical strength.

The fabrication process, from tungsten functionalism to filament extrusion and material characterization, is described, including printability, determination of x-ray attenuation, tensile strength, impact resistance, and gigahertz permittivity, and failure analysis. The proposed materials are uniquely advantageous when implemented in 3D printed structures, because even a small volume fraction of tungsten has been shown to substantially alter the properties of the resulting composite.

tungsten polymer radiation shielding

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