2016.11.08-Tungsten Carbide Plate Price
- Category: Tungsten Carbide Price
- Published on 08 November 2016
- Hits: 1572
As reported by Chinatungsten Online, the current price of YG10 tungsten carbide plate for 105mmx105mmx15mm is $230.00 per piece EXW Xiamen, China on NOV.8, 2016.
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Ammonium Metatungstate Preparing Radiation Shielding Non-Woven Fabric
- Category: Ammonium Metatungstate
- Published on 04 November 2016
- Hits: 2190
With the rapid development of modern science and technology, all kinds of high-energy rays (such as X-ray) have been more and more widely applied. Besides, since people have put more and more concern to the protection of high-energy rays, and thus, the research and manufacture of X-ray protection materials is emerging in endlessly. There are three ways for X-ray protection, respectively time, distance and shielding protection. Wherein, the shielding protection is using or setting a kind of shielding material which can absorb the X-ray between human body and radiation source, thus to weaken or even eliminate the damage which X-ray brings to human body.
At present, the main X-ray protection material is the metal with high density, such as lead plate, lead rubber and compounds with lead, to shield the ionizing radiation of X-ray. However, as for personal radiation protection, lead oxide will firstly poison human body, and cause environmental pollution; secondly, the hard material will make human body uncomfortable.
For solving that problem, an invention has pointed out a method which takes ammonium metatungstate (AMT) as one kind of raw material component to prepare radiation shielding non-woven fabric. The radiation shielding non-woven fabric is some kinds of fabric with radiation shielding function which is formed by no need of spinning weaving. In this radiation shielding non-woven fabric, the weight ratios of all kinds of materials are: 1~10% of ammonium metatungstate (AMT), 5~20% of polyacrylonitrile copolymer and 80~95% of DMF, while the preparation steps are like following:
1. Weight the raw material of AMT, polyacrylonitrile copolymer and DMF according to weight ratio and get them into mixture solution, and then obtain spinning solution by ultrasonic standing deaeration;
2. Carry out electrostatic spinning process to the spinning solution which generated from step 1 to prepare grey cloth with nano or micron grade;
3. The grey cloth is carried out drying treatment and then went on preoxidation in the air;
4. Go on a carbonization after the grey cloth is finished preoxidation, then we will obtain the desired radiation shielding non-woven fabric.
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Ammonium Metatungstate Price on Nov.2nd, 2016
- Category: Ammonium Metatungstate
- Published on 02 November 2016
- Hits: 2185
Ammonium metatungstate price with purity over 91.40% from Chinatungsten Online is 35.50 USD/KG, by Chinatungsten FOB Xiamen, Nov.2nd, 2016.
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Ammonium Metatungstate Preparing Ammonium Tetrathiotungstate
- Category: Ammonium Metatungstate
- Published on 02 November 2016
- Hits: 2168
Ammonium tetrathiotungstate [(NH4)2WS4], which is short for ATTT, is widely applied in the synthesis of biological nitrogenase activity center - tungsten iron sulfur atom cluster compounds, also is the precursor of coal liquefaction and heavy oil hydrogenation catalyst, and also can be raw material for preparing supported tungsten sulfide hydrogenation catalyst. The traditional way to produce ammonium tetrathiotungstate from the raw material of ammonium metatungstate (AMT) is introducing hydrogen sulfide gas into ammonia solution with AMT, wherein the hydrogen sulfide gas is generated by sodium sulphide (Na2S) and phosphoric acid in situ method. However, since this method will take a long reaction time, consume a large number of sodium sulphide and phosphoric acid, and also will discharge much rubbish, moreover, it also involves the treatment of toxic and stinking hydrogen sulfide gas, and thus has been eliminated.
For shortening the reaction time, reducing pollution to the environment, and obtaining high purity product at the same time, an invention has pointed a method to prepare ammonium tetrathiotungstate from raw materials of ammonium metatungstate (AMT), concentrated ammonia water and ammonium sulfide solution, the steps are shown as following:
1. Weight a certain amount of ammonium metatungstate powder and add distilled water, control the ratio of dosage distilled water and AMT at among 3 ~ 6/1 (Calculated by ml/g);
2. Add a certain amount of concentrated ammonia water with stirring and heating to 40～60℃ to dissolve, the ratio of dosage concentrated ammonia water and AMT is 1～2/1 calculated by ml/g;
3. Control the solution temperature among the room temperature (25℃) to 90℃, then add ammonium sulfide solution with sulfur content of 6～12％ with stirring, the mole ratio of sulfur and tungsten in the added amount of ammonium sulfide solution and reactant liquid is 4~6 to 1, and stir for 0.5~3 hours to get blood red liquid;
4. After the reaction finished, take out the reactant to cool to room temperature and get it crystallize for 8~24 hours, then filter the solution with crystal and wash them with cold distilled water for 3 times, finally wash the crystal with anhydrous ethanol for 2~3 times, then carry out drying solvent, drying under room temperature for 24 hours to get dark red needle crystal of ammonium tetrathiotungstate.
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2016.11.02-Tungsten Carbide Ball Price
- Category: Tungsten Carbide Price
- Published on 02 November 2016
- Hits: 1465
As reported by Chinatungsten Online, the current price of G10 tungsten carbide ball for Ø6.35mm is $0.39 per piece EXW Xiamen, China on NOV.2, 2016.
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2016.11.02-Tungsten Copper Tube Price
- Category: Tungsten Copper Price
- Published on 02 November 2016
- Hits: 1470
As reported by Chinatungsten Online, the current price of 65%W35%Cu tungsten copper tube of Ø8mmxØ5mmx175mm is $27.30 per piece EXW Xiamen, China on NOV.2, 2016.
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Ammonium Metatungstate Testing Equipment
- Category: Ammonium Metatungstate
- Published on 01 November 2016
- Hits: 2133
Testing equipment of ammonium metatungstate includes atomization device, inductively coupled plasma (ICP), electronic balance, visible spectrophotometer, metallographic microscope, atomic absorption spectrophotometer, etc..
Both Graphite Furnace Atomic Absorption Spectrometry and Atomic Absorption Spectrometry method use the atomizer. Atomizer is an apparatus of atomizing the sample of atomic absorption spectrometry, and it will convert the sample to the free atomic vapor (ground state atoms) thus to absorb the radiation and calculate the analyte content. Atomizer has many types and can be divided into two categories of thermal and electric filling atomizer. The former includes a pre-mixed, all-consuming; the latter includes graphite furnace, carbon filament atomizer, atomizer carbon rod, graphite increased exhaust, graphite probes ect..
An inductively coupled plasma (ICP) or transformer coupled plasma (TCP) is a type of plasma source in which the energy is supplied by electric currents which are produced by electromagnetic induction, that is, by time-varying magnetic fields. There are three types of ICP geometries: planar, cylindrical, and half-toroidal.
Electronic balance (which is also known as electronic scale) is a kind of weighing scale, the device to measure weight or calculate mass. The ordinary electronic scales intrinsically measure the gravitational force between the sample and the earth, i.e. the weight of the sample, which varies with location. So such a scale has to be re-calibrated after installation, for that specific location, in order to obtain an accurate indication of mass.
Visible spectrophotometer is used in the spectrophotometry, in chemistry, spectrophotometry is the quantitative measurement of the reflection or transmission properties of a material as a function of wavelength. It is more specific than the general term electromagnetic spectroscopy in that spectrophotometry deals with visible light, near-ultraviolet, and near-infrared, but does not cover time-resolved spectroscopic techniques.
Metallographic microscope is equipment in the metallography which may also use the scanning transmission electron microscope, bright and dark field microscopy and polarized light microscopy and other equipments. Now, the metallographic microscope is usually combining with computer and to form computer type metallographic microscope or digital metallographic microscope, the high-tech product which gets optical microscopy, photoelectric conversion and computer image processing technology together perfectly, and can easily observe the metallographic image of ammonium tungstate on computer, thus to analyze and rate the metallographic atlas, and also output, print images.
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2016.10.31- Tungsten Carbide Polished Rod Price
- Category: Tungsten Carbide Price
- Published on 31 October 2016
- Hits: 1603
As reported by Chinatungsten Online, the current price of YG10X tungsten carbide polished rod for Ø4.5mmx50mm is $1.00 per piece EXW Xiamen, China on OCT.31, 2016.
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2016.10.31-Tungsten Copper Plate Price
- Category: Tungsten Copper Price
- Published on 31 October 2016
- Hits: 1510
As reported by Chinatungsten Online, the current price of 90%W10%Cu tungsten copper plate of 100mmx100mmx1.6mm is $32.00 per piece EXW Xiamen, China on OCT.31, 2016.
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2016.10.27-Tungsten Carbide Ball Ø10.00mm Price
- Category: Tungsten Carbide Price
- Published on 27 October 2016
- Hits: 1529
As reported by Chinatungsten Online, the current price of YG6 tungsten carbide ball for Ø10.00mm is $1.50 per piece EXW Xiamen, China on OCT.27, 2016.
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