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＞ Main Factors on the Quality of Tungsten Contacts (3)

3. Inappropriate process design can bring about a bad effect on the quality of tungsten contacts

There is no classification on the process of pure tungsten blanks (coarse grain, fine grain and other crystalline), but only adopt different processing temperatures.
In the swaging process, the heating temperature is fluctuant and feeding speed is uneven. And increasing appropriate holding time failed in the tungsten blanks rounded process.
Alkaline wash of tungsten rod surface is not appropriate.


 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - https://www.estoolcarbide.com
 
 Email: lyx@hunanestool.com
 Tungsten Carbide Insert Manufacturer & Molybdenum Information Bank: https://www.estoolcarbide.com
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＞ Tungsten Target Production Process

Tungsten target is made from raw ground tungsten powder, which has been widely applied in X-Ray tube, thin-film material, semi-conductor integrated circuit, medical and smelting equipment, rare earth smelting, aerospace and many other fields. Tungsten target&carbide cutting inserts rsquo;s production process in briefly is that pressing the tungsten powder into form and sintering, then hot isostatic pressing, bloomed, cold rolling, annealing, cutting, machining and bonding with a copper backing plate. 

Tungsten target production process:

To form its shape, we can use metal smelting, powder metallurgy, non-metallic powder method and vacuum melting, hot or cold sintering molding methods.

By forging, hot or cold, then heat-treated to eliminate stress profiles and homogenized or by high temperature sintered to increase its density,

Then to complete the final product, we should the treated sections of turning, milling, planing, grinding and other machining process, and then washing and drying.

Sometimes it needed to bind with oxygen-free copper backplane ground after some target metallization.

We can package the tungsten target product after testing by ultrasonic or X-rays and other methods.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - https://www.estoolcarbide.com
 
 Email: lyx@hunanestool.com
 Tungsten & Molybdenum Information Bank: https://www.estoolcarbide.com
 Tungsten News & Tungsten Prices, 3G Version: https://www.estoolcarbide.com
 Molybdenum News & Molybdenum Price: https://www.estoolcarbide.com

＞ Tungsten Alloy F1 Racing Car Counterweights Ⅲ

All F1 racing cars design engineers will limit the minimum vehicle weight restrictions following FIA regulations, it’s the only way to use the counterweights to adjust the racing cars counterweights for some special racing track. Thus, increasing the counterweights to racing cars is a very important but difficult task . Due to its high density, so the volume of each piece of tungsten alloy counterweight is not great, but the weight is twice than the weight of the same volume of steel, and Steel Inserts therefore it is very suitable to be used as a counterweight in F1 racing cars(the following pic is the racing car tungsten alloy hub counterweights of the Red Bull Racing team in the French Grand Prix). For F1 racing cars, the correct and rational use of tungsten alloy counterweight can largely enhance the performance of the racing car in a racing game, improve the car's handling performance, control the racing cars’ weights distribution, thus to reduce the center of gravity of the racing cars. In 2002, the FIA and some professionals made the reform program for F1 racing cars counterweights, that is 1 bonus point got from the World Championship, one kg counterweight can be increased in his racing car. So it can be seen that increasing counterweights to the racing cars is very important. 

＞ Ultrafine Tungsten Powder Preparation -- Hydrogen Reduction Method (2)

In W-O-H there are 6 solidification phase, which are: tungsten trioxide (WO₃), beta tungsten oxide (WO_2.9, W₂₀O₅₈, blue tungsten) gamma tungsten oxide (WO_2.72, W₁₈O₄₉, Purple Tungsten) two tungsten oxide (WO₂), -W alpha and beta -W. Therefore, the process of hydrogen reduction reaction of tungsten oxide is complex, and different reduction processes will occur with the change of temperature and humidity: In a high temperature and a humid reducing atmosphere, the reduction proceeds in distinct stages ( WO₃ → WO_2.9 → WO_2.72 → WO₂→ W ); In low temperature carbide Milling Inserts and dry hydrogen, it is possible to reduce tungsten oxide to tungsten powder directly from high valence tungsten oxide ( WO_2.9 → W，WO_2.72 → W ), the process is roughly: tungsten oxide → hydrogen reduction → screening → batch → tungsten powder.

＞ Prepare High-Surface Area Composite Materials--WC-C

The catalyst, being a necessity of improve the efficiency in chemical, energy industry, and the surface area is one of the main factors to determine the catalyst’s property, that means improving the surface area will directly affect the production efficiency. Tungsten carbide (WC) as a new type of catalyst, the performance improvements are hampered due to the lower-surface area. Therefore, how to improve the catalytic activity has become one of the main challenges in preparing WC catalyst. There is an invention which provides a method to generate high dispersion and surface area of WC-C composite material, and the production can be used in the catalysis fields of chemical and electronic. Specific steps are shown as bellows:
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1. Use ammonium paratungstate (APT) as precursor, add active metal powder in the mass ratio that APT: metal is 1:0.1~1 into the quartz boat under the protection of nitrogen, then moved in the tube furnace;
2. Inlet carbonization gas –CO to carry out carbonization at the mode of temperature programmed, and the heating rate is 4~15℃/min;
3. Cooling to room temperature under the protection of nitrogen;
4. Remove metal in the acid solution, and then filtering, drying to get black powder that is WC-C composite materials.

Remarks:
1) Ammonium paratungstate can also be replaced by ammonium metatungstate, sodium tungstate or tungstate;
2) Active metal powder can be Mg, Na or Al;
3) The flow rate of carbonization gas-CO through the tube furnace supposed to be 100~200ml/min;
4) Acid solution which is used to remove metal can be hydrochloric, sulfuric acid and other common acid.