Lead Free Shielding Material

For decades, lead has been considered in radiation shielding. It’s cheap, easy to process, and provides very effective shielding. Yet growing health, safety and environmental concerns over the mining, processing, handling and disposal of lead have brought about an increasingly stringent regulatory environment regarding the sale and use of lead products.

There are three factors which determine the amount of radiation received from a source: 1) time of exposure; 2) distance from source; and 3) shielding. Based upon the application, the material density and wall thickness has been found. Utilizing a composite of tungsten powder in a polymeric matrix, lead free radiation shielding materials provide device manufacturers and material processors with a completely lead-free, injection-moldable thermoplastic solution to overcome all regulatory concerns and satisfy radiation shielding needs.

tungsten polymer shielding

 

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Tungsten Polymer Sheet

Previous radiation shielding products have been made mainly from lead sheets, making them heavy and hard to handle, and there have been concerned about their effects on the human body. By contrast, tungsten polymer sheet is comprised of soft thermoplastic lassoers integrated with an inorganic substance that shields against radiation. Outstanding features are its flexibility and ease of handling.

The raw materials used in tungsten polymer sheet have been proven to be safe and have no effect on the human body. Tungsten polymer is a high-polymer material that possesses the properties of both plastic and rubber. It can be cut or holed with household scissors and formed into shapes with various curved surfaces.

Tungsten polymer sheet can be used in:
-Radiation shielding and radiation-protective equipment;
-X-ray inspection device for industrial and medical use;
-Gamma-ray shielding material and substitute for lead fiber mat in nuclear reactor piping systems.

tungsten polymer sheet

 

  Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online- http://www.tungsten-alloy.com
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Lanthanum Tungsten Electrode - Ⅱ

Today, lanthanum tungsten electrode is the world's most popular tungsten electrode materials, particularly lanthanum oxide content of 1.5% lanthanum tungsten electrode, which is different from the content of 2.0% lanthanum tungsten electrode. Studies have shown that, the conductive properties of lanthanum tungsten electrode (1.5% of La2O3 content) is closest to thorium tungsten electrode (2.0% of ThO2 content), so welders can replace the electrode, without the need to change the parameters of the device.

In 1998, an experiment showed that: 1.5% La2O3 lanthanum tungsten electrode has excellent welding performance and a smaller burn rate; it can be used for AC welding, and has excellent performance.

Experiment
Materials: 2.0% CeO2 of cerium tungsten electrode; 2.0%ThO2 of lanthanum tungsten electrode; 1.5% La2O3 of lanthanum tungsten electrode.
Procedure: Respectively placing them under the current of 70A and 150A conditions, and under 300V DC environment, to carry out the welding experiment.

Advantages of lanthanum tungsten electrode
1. With good creep resistance properties;
2. With higher recrystallization temperature;
3. With Excellent ductility;
4. With better mechanical cutting properties and so on.


 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
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Lanthanum Tungsten Electrode -Ⅲ

In the 1880s, Western countries developed lanthanum tungsten electrode to replace thorium tungsten electrode product, after that, it is very popular in the international welding industry due to its excellent welding performance, for this reason, the export volume of lanthanum tungsten electrode is just behind thorium tungsten electrode.
In other countries, under normal circumstances, thorium tungsten electrode would be replaced by lanthanum tungsten electrodes. Because La2O3 has the following advantages: (1) the lowest electronic work function; (2) the lowest tip temperature; (3) the easiest arcing and the like.

The existence of these advantages can effectively prevent crystal growth, so that its life can be prolonged. By testing lanthanum tungsten electrode 2% of La2O3 showed that: If there is no overload current exist, it has a longer life than thorium tungsten electrode, and its arc is easier to use.
Lanthanum tungsten electrode: 2% of La2O3; 1.5% of La2O3; 1% of La2O3. The most common is lanthanum tungsten electrode containing 2% of La2O3 (called lanthanum oxide).

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
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Lanthanum Tungsten Electrode -Ⅰ

Lanthanum tungsten electrode (adding cerium oxide - La2O3 to tungsten) grade and standard

Grade

Color sign

Other impurities%

Tungsten %

dopant

Doping amount %

Electronic work function/ eV

WL20

Sky blue

<0.20%

The rest

La2O3

1.80~2.20

2.8~3.2

WL15

Golden

1.30~1.70

2.8~3.0

WL10

Black

0.80~1.20

2.6~2.7

Common specification
Grade --- WL10
Length (mm): 150/175
Diameter (mm): 0.5 / 2.0 / 3.0 / 4.0 / 4.8 / 6.0 / 8.0 / 12.0, etc.
Ingredients: tungsten, La2O3
Welding materials: stainless steel, carbon steel, aluminum, copper and the like.


 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: sales@chinatungsten.com
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
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