Coil Tungsten Filament Price on Dec. 27, 2016
- Category: Tungsten Metal Price
- Published on 28 December 2016
- Hits: 2199
Coil tungsten filament price with purity over 99.95%, size Ø0.8mm and shape of coil is 2.80USD/PC, EXW XIAMEN, CHINA, Dec. 27, 2016.
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Tungsten Crucible Price Ø100xØ600x5mm on Dec. 27, 2016
- Category: Tungsten & Sapphire Growth Furnace Price
- Published on 28 December 2016
- Hits: 2326
Sapphire growth furnace used tungsten crucible price Ø100xØ600x5mm with purity over 99.95% is 2,060.00USD/PC, FOB XIAMEN, CHINA, Dec. 27, 2016
The MOQ of sapphire growth furnace used tungsten crucible is 1pc.
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Ammonium Metatungstate Preparing Barium-Tungsten Cathode
- Category: Ammonium Metatungstate
- Published on 27 December 2016
- Hits: 1735
Currently, the barium-tungsten which is widely used in the magnetron is limited, due to the strong electronic back in the device which makes the consumption of BaO is too fast and thus to result in the decrease of the device’s life; moreover, the secondary electron emission ability of it is difficult to meet the requirement of high power microwave device. Furthermore, due to the radioactive problem of Th, it is already suitable for some of the high power magnetron ThO2 cathode. Study found that even through the rare earth - molybdenum metal ceramic cathode materials has a stable secondary electron emission performance, but its thermal emission performance is poor, and requires a higher temperature in magnetron start up, and thus to limit its using in the magnetron. 2016.12.26-Tungsten Carbide G25 Polished Ball Price
- Category: Tungsten Carbide Price
- Published on 26 December 2016
- Hits: 1306
As reported by Chinatungsten Online, the current price tungsten carbide G25 polished ball of YG6 for Ø15.875mm is $3.97 per piece EXW Xiamen, China on DEC.26, 2016.
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2016.12.26-Tungsten Copper Rod Price
- Category: Tungsten Copper Price
- Published on 26 December 2016
- Hits: 1476
As reported by Chinatungsten Online, the current price of 75%W25%Cu tungsten copper rod of Ø30mmx150mm is $77.10 per piece EXW Xiamen, China on DEC.26, 2016.
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Ammonium Metatungstate Catalyzing Preparation of 1 - Methyl Imidazole
- Category: Ammonium Metatungstate
- Published on 23 December 2016
- Hits: 2235
1 - methyl imidazole is one of the important intermediate of imidazoles, which has extensive application in Ionic liquid epoxy resin and curing agent. The traditional synthetic methods of 1 - methyl imidazole are two-step and one-step process, wherein, two-step method is firstly condensing glyoxal and formaldehyde, ammonia water to generate imidazole, then going on a methylation reaction with the dimethyl sulfate finally get 1 - methyl imidazole, however, this process is using the highly toxic raw material of dimethyl sulfate, which will also higher the cost; the one-step method is taking glyoxal, formaldehyde, methylamine and ammonia water as raw materials, but this process exists the shortcomings of low yield, many more by-products and has more troublesome in separating and purifying.
One research has pointed out a new kind of synthesis methods of 1 - methyl imidazole, which is introducing the ammonium metatungstate column brace hydrotalcite as catalyst, using imidazole as raw material, and methanol as the methylation reagent, and through the fixed bed continuous method to directly synthesize 1 - methyl imidazole. The reaction equation is showing as the picture below:
The properties of this method to prepare 1 - methyl imidazole are as follows:
1. The molar ratio of imidazole and the methanol is optimized of 1:4 ~ 6;
2. The reaction conditions are: the pressure in the fixed bed is 0.4 ~ 0.6 MPa, the temperature shall be in 320 ~ 350°C, the reaction liquid feed quality airspeed is 0.3 ~ 0.4 / h;
3. The advantages of simple operation, less pollution and high yield, and is easy to be industrialized production;
4. Ammonium metatungstate (AMT) catalyst has high catalytic activity, small pollution to the environment, long life and other advantages;
5. The methanol used as methylation reagent will lower the cost of raw materials, and also has lower toxicity.
Ammonium metatungstate catalyst is a new kind of catalyst with better property. When methyl alcohol transfers to hydrocarbon, it shows great catalytic ability and unique selectivity. And thus, ammonium metatungstate is widely used in petroleum, electronic, national defense, aviation, metallurgy, anticorrosion and antiflaming, etc. It now becomes new catalytic material, and its application and consumption is increased day by day.
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2016.12.23-Tungsten Carbide Bar Price
- Category: Tungsten Carbide Price
- Published on 23 December 2016
- Hits: 1393
As reported by Chinatungsten Online, the current price of YG6 tungsten carbide bar for 100mmx10.4mmx3.3mm is $15.00 per piece EXW Xiamen, China on DEC.23, 2016.
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2016.12.23-Tungsten Copper Plate Price
- Category: Tungsten Copper Price
- Published on 23 December 2016
- Hits: 1437
As reported by Chinatungsten Online, the current price of 85%W15%Cu tungsten copper plate of 16.5mmx28.5mmx6.3mm is $3.00 per piece EXW Xiamen, China on DEC.23, 2016.
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Yellow Tungsten Oxide Price on Dec. 23th, 2016
- Category: Tungsten Oxide/Trioxide Price
- Published on 23 December 2016
- Hits: 2233
Yellow tungsten oxide with WO3 content over 99.90% from Chinatungsten Online is 36.00 USD/KG, by Chinatungsten FOB Xiamen, Dec. 23th, 2016.
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Blue Tungsten Oxide Price on Dec. 23th, 2016
- Category: Tungsten Oxide/Trioxide Price
- Published on 23 December 2016
- Hits: 2238
Blue tungsten oxide price with purity over 99.90% from Chinatungsten Online is 35.60 USD/KG, by Chinatungsten FOB Xiamen, Dec. 23th, 2016.
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