2016.12.06-Tungsten Copper Sheet Price
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- Category: Tungsten Copper Price
- Published on Tuesday, 06 December 2016 14:39
- Hits: 1475
As reported by Chinatungsten Online, the current price of 50%W50%Cu tungsten copper sheet of 1mmx75mmx245mm is $50.00 per piece EXW Xiamen, China on DEC.6, 2016.
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2016.12.06-Tungsten Carbide Inserts Price
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- Category: Tungsten Carbide Price
- Published on Tuesday, 06 December 2016 14:32
- Hits: 1658
As reported by Chinatungsten Online, the current price of tungsten carbide inserts for WNMG080408 EFYB9205 is $2.20 per piece EXW Xiamen, China on DEC.6, 2016.
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Ammonium Metatungstate Preparing Nano Tungsten Oxide Aqueous Solution
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- Category: Ammonium Metatungstate
- Published on Monday, 05 December 2016 15:59
- Hits: 2067
Nano tungsten oxide can not soluble in water itself, the so called nano tungsten oxide aqueous solution is the dispersion which nano tungsten oxide particles are uniformly distributed in water, to play the roles of oxidization and reunion of tungsten oxide. Tungsten oxide is the typical transition metal oxides, while the nano tungsten oxide is a new type of functional material, and because of its excellent discoloration performance, it can be widely used in many fields, such as intelligent window, large area flat panel display, gas sensor, dye-sensitized solar cell, automatic mirror, energy storage.
Ammonium metatungstate (AMT) is the important intermediate compound of tungsten metallurgy, and being the important raw material for manufacturing tungsten oxide, tungsten and tungsten carbide powder and other tungsten products. An invention has proposed one method to prepare nano tungsten oxide aqueous solution from the raw material of ammonium metatungstate and sodium borohydride, with the steps like bellows:
1. Weight the appropriate amount of ammonium metatungstate and sodium borohydride according to the mass ratio of 1~10:1;
2. Add the AMT powder into deionized water to dissolve with stirring and get the ammonium metatungstate aqueous solution with the concentration of 5~50%;
3. Add the weighted sodium borohydride solid into the AMT solution and stir to mix them uniformly, stay to react for 10~60 minutes under the room temperature to 95°C to get the blue nano tungsten oxide aqueous solution with 0.1〜10nm uniform particle size. since the ammonium metatungstate will react with sodium borohydride to generate blue nano WO2.9, and it will release heat, a large number of hydrogen gas and ammonia gas during the reaction process, which will remove purity of ammonium ion.
Nano tungsten oxide aqueous solution prepared by this method has the advantages of good stability, small particle size of nano tungsten oxide and others, thus to have wide application in intelligent window, gas sensor and solar energy cell and other fields.
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Ammonium Metatungstate Preparing Nanoscale Zirconium Tungstate Hollow Sphere
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- Category: Ammonium Metatungstate
- Published on Wednesday, 30 November 2016 17:28
- Hits: 2207
The cubic zirconium tungstate is one of the hotspots in the research of negative thermal expansion materials, with its widest range of negative expansion effect, high negative expansion coefficient and isotropy and other advantages, it can be combined with positive expansion into the specific materials with zero or low expansion, and thus to be used in the some devices which is used under extreme temperature conditions field of aerospace. The preparation methods of zirconium tungstate are solid phase sintering, sol-gel, combustion, chemical coprecipitation and microwave method ect., however, the zirconium tungstate particles or whiskers prepared by these methods are irregular, and can not be used in some specific fields, such as aerospace.
There is an invention disclosed a method for preparing nanoscale zirconium tungstate hollow sphere by hydrothermal synthesis method from the raw materials of ammonium metatungstate (AMT) and zirconium oxychloride, with the steps as following:
1. Respectively weight the right amount of ammonium metatungstate and zirconium oxychloride according to the stoichiometric ratio of zirconium tungstate (ZrW2O8), respectively, and prepare zirconium oxychloride aqueous solution and ammonium metatungstate aqueous solution respectively;
2. Add zirconium oxychloride aqueous solution into ammonium metatungstate aqueous solution under the condition of stirring, then preheat the mixture at the temperature of 60～70℃ with stirring continuous;
3. Add hydrochloric acid solution with continuously stirring, and then heat the solution to 80~100℃, then we get the zirconium tungstate precursor suspension after keeping the temperature for a proper time;
4. The zirconium tungstate precursor suspension is carried out a hydrothermal reaction at a temperature of 170~190℃, followed by cooling, collecting the precipitate and washing to remove chloride ions (Cl- ), drying, calcining at 800~1000℃, and finally to obtain nanoscale zirconium tungstate hollow sphere.
In this method of preparing zirconium tungstate by using AMT as raw material, due to the hydrothermal synthesis method can truly realize synthesizing zirconium tungstate powder at a low temperature, cut down the synthesis time of the precursor and control the direction of crystal growth; thus, the prepared nanoscale zirconium tungstate hollow sphere has the benefits of uniform particle size, good negative expansion performance and low density ect., and to have great potential for applying in aerospace field.
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Ø2.4x150.0mm Thoriated Tungsten Electrode Price on Nov. 30, 2016
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- Category: Tungsten Electrodes Price
- Published on Wednesday, 30 November 2016 10:01
- Hits: 2001
WT20 thoriated tungsten electrode price with Ø2.4x150.0mm is 0.6875USD/pc, EXW XIAMEN, CHINA, Nov. 30, 2016.
The MOQ for this diameter under such price is 5,000pcs.
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Coil Tungsten Filament Price on Nov. 30, 2016
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- Category: Tungsten Metal Price
- Published on Wednesday, 30 November 2016 09:41
- Hits: 2079
Coil tungsten filament price with purity over 99.95%, size Ø0.8mm and shape of coil is 2.80USD/PC, EXW XIAMEN, CHINA, Nov. 30, 2016.
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Ø100xØ600x5mm Tungsten Crucible Price on Nov. 30, 2016
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- Category: Tungsten Metal Price
- Published on Wednesday, 30 November 2016 09:39
- Hits: 1917
Ø100xØ600x5mm tungsten crucible price with purity over 99.95% is 2,060.00USD/PC, EXW XIAMEN, CHINA, Nov. 30, 2016.
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Tungsten Crucible Price Ø100xØ600x5mm on Nov. 30, 2016
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- Category: Tungsten & Sapphire Growth Furnace Price
- Published on Wednesday, 30 November 2016 09:34
- Hits: 1735
Sapphire growth furnace used tungsten crucible price Ø100xØ600x5mm with purity over 99.95% is 2,060.00USD/PC, FOB XIAMEN, CHINA, Nov. 30, 2016
The MOQ of sapphire growth furnace used tungsten crucible is 1pc.
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2016.11.29-Tungsten Carbide Blank Rod Price
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- Category: Tungsten Carbide Price
- Published on Tuesday, 29 November 2016 17:45
- Hits: 1723
As reported by Chinatungsten Online, the current price of YG10x tungsten carbide blank rod for Ø6mmx330mm is $8.60 per piece EXW Xiamen, China on Nov.29, 2016.
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2016.11.29-Tungsten Copper Sheet Price
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- Category: Tungsten Copper Price
- Published on Tuesday, 29 November 2016 17:39
- Hits: 1532
As reported by Chinatungsten Online, the current price of 80%W20%Cu tungsten copper sheet of 1.5mmx30mmx80mm is $5.50 per piece EXW Xiamen, China on Nov.29, 2016.
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