Gemini Tungsten Gold-plated Coins
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- Category: Tungsten Information
- Published on Thursday, 04 February 2016 10:21
- Written by yaqing
- Hits: 288

Tungsten Gold Plated Supplier: Chinatungsten Online www.tungsten-alloy.com | Tel.: 86 592 5129696; Fax: 86 592 5129797;Email:sales@chinatungsten.com |
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Arise Tungsten Gold-plated Coins
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- Category: Tungsten Information
- Published on Thursday, 04 February 2016 10:19
- Written by yaqing
- Hits: 287

Tungsten Gold Plated Supplier: Chinatungsten Online www.tungsten-alloy.com | Tel.: 86 592 5129696; Fax: 86 592 5129797;Email:sales@chinatungsten.com |
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Seismic Tungsten Wire
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- Category: Tungsten Information
- Published on Wednesday, 03 February 2016 18:54
- Written by yiping
- Hits: 269
Seismic tungsten wire having good seismic performance not only has a good seismic performance and impact properties at room temperature and high temperature, also has a high temperature anti-sag property and good winding performance. Seismic tungsten wire is mainly used in lighting system for vibration environment, such as cars, motorcycles, tractors and other vehicles lighting, but it also can be applied to the military lighting field and as a heating wire used in aerospace field engine. Its use is widespread.
Seismic tungsten wire was produced by doping K, Si, Al and other elements into tungsten powder. After studies found that adding K and Al into tungsten powder seismic tungsten wire can not be successfully produced, but the product has excellent processing performance. And doping in the tungsten powder with K and Si obtained seismic tungsten wire has ordinary seismic performance. Only doping with K, Si and Al, you can achieve seismic tungsten wire which has excellent performance. This is because that doping Si is conducive to maintaining oxidation layer’s sponginess and permeability of water during the reduction process, so that the doping will more uniform, but also conducive to obtaining the necessary potassium. Doping Al can improve the potassium content in tungsten powder to obtain high-quality seismic tungsten wire. Doping with K can obtain potassium bubble. The dispersion of potassium bubble which can significantly reduce the low-temperature brittleness of tungsten wire, reduce splitting, making seismic tungsten wire get the best seismic performance.
With the development of science and technology, every industry has strict quality requirements of stringent seismic tungsten wire. To produce excellent performance seismic tungsten wire need to optimize production processes and process improvements, but also need further research and experimentation, making seismic tungsten wire can have broad market prospects in various fields.
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Seismic Tungsten Wire Production Processes
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- Category: Tungsten Information
- Published on Wednesday, 03 February 2016 18:57
- Written by yiping
- Hits: 252
Seismic tungsten wire was produced by doping K, Si, Al and other elements. It is widely used in the lighting system at vibration environments. Seismic tungsten wires were divided into three types. First kind is seismic tungsten wire doping with Si, Al and K elements and this type has good organizational structure and high-temperature sag resistance value is small. Second kind is seismic tungsten wire doping small amount of Fe or Co elements whcih based on Si, Al, and K elements doped, and this seismic tungsten wire has better high temperature resistant, sag resistance and other performance; third kind is tungsten rhenium alloy wire which produces by doping Si, Al, and K elements and small amount of Re into tungsten powder. Tungsten rhenium alloy wire has good organizational structure, high recrystallization temperature, resistivity, elongation and other good properties.
Seismic tungsten wire production processes are as following:
1. Mix the raw material and the doping elements evenly by proportionately, and dried. Then placed them in a hydrogen furnace occurs reduction reaction by sintering. The raw material can be used are ammonium paratungstate (APT), ammonium metatungstate (AMT) and tungsten blue (TBO), but the study showed, blue tungsten oxide has high chemical resistance, good doping effects, large specific surface area and excellent fast rate, and other good performances, so it can produce seismic tungsten wire with better performances.
2. The reduction calcined powder after wash by acid and then drying, pressing, sintered.
3. The sintered blank after thermal processing obtains seismic tungsten filament.
In the preparation process, there are basically three methods for Si, Al, K, and other elements doping. One is mixing tungsten powder and doped powder, namely solid - solid doping. Although this method has simple process, but it is difficult to make doped powder evenly distributed in tungsten powder and will bring some problem on the subsequent processing; the second is the matrix solution and the doping solution, namely liquid - liquid doping. This doping method has complex processes which are not suitable for industrial production; third doping method is powder and doping elements mashing solution doping that solid - liquid doping, it not only has simple process steps, produced seismic tungsten wire has a good performance which widely used in the industry.
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Prepare Silicon Tungstate from Ammonium Paratungstate
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- Category: Tungsten Information
- Published on Wednesday, 03 February 2016 17:50
- Written by chunyan
- Hits: 240
There are large number types of tungsten heteropoly acid. A method for preparing silicon tungstate from ammonium paratungstate, the specific steps are as follows:
1. Conversion process: select ammonium paratungstate, heating to 90~100℃, stirred with a speed of 60~120r/min, adjusting pH value among 2~4, then ammonium metatungstate (AMT) obtained;
2. Mach silicon: adding silicate into the transformed AMT, then adding ammonia, and adjust pH value to 7-8, heated to 90~100℃ with stirring, reaction time for 2~4.5 hours, pH 9 ~ 14, ammonium silicon tungstate;
3. Cation exchange: reaction in exchange column, the rate is 30~100L/hour;
4. Evaporation and concentration: filter to remove the insoluble in solution when the specific gravity of organic solution is 2g/cm3; continue to evaporate to get silicon tungstate until it reaches 3g/cm3.
The advantages of that method are as following:
1. Reasonable process, good quality of the product, no pollution, and suitable for large scale industrial production especially;
2. With important promotion value;
3. A kind of environmental friendly green catalyst widely used in petrochemical, chemical catalysis and medicine field;
4. Laid the foundation about producing and developing heteropoly acid and salt centered with other elements.
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