Tungsten foil is a thin, flat metallic material made of pure tungsten. It has a high melting point (up to 3410°C), high density, high gravitational force, high strength, and hardness, and has good corrosion resistance and wear resistance. Due to these characteristics, it is very durable under high temperature, vacuum and high pressure environment, so it is widely used in fields such as aerospace, defense, electronics, semiconductor, medical treatment and scientific research. Its manufacturing process is mainly to process tungsten material into thin foil or sheet by hot rolling, cold rolling, drawing and other methods. The thickness of tungsten metal foil is usually between 0.005mm and 0.5mm, and the width and length can be customized according to customer needs.
1. Feature
Tungsten foil is a thin sheet of tungsten metal commonly used in high-temperature applications in industry and scientific research. Following are the characteristics, chemical composition and physical properties of tungsten metal foil:
- High melting point: The melting point of tungsten is 3410°C, which is one of the highest melting points of all metals.
- High Density: With a density of 19.3 g/cm3, tungsten is one of the densest elements known on Earth.
- Excellent corrosion resistance: Tungsten is a metal with very good corrosion resistance and can be used in extreme conditions, such as high temperature and high pressure environment, acid and alkali environment, etc.
- Ease of Machining: It can be easily cut, drilled and welded into components of various shapes and sizes.
1)Chemical Composition
Pure Tungsten usually composed of at least 99.95% tungsten (W), with very low levels of other impurities.
2) Physical properties
- Melting point: 3410°C
- Boiling point: 5660°C
- Density: 19.3 g/cm3
- Thermal conductivity: 173 W/m K
- Coefficient of thermal expansion: 4.5 × 10-6 / K
It should be noted that tungsten is relatively difficult to process because of its high density, so the cost of making tungsten foil is also relatively high.
2. Production Processes
The production process of tungsten metal foil is as follows:
- Screening and crushing - High-purity tungsten powder is preliminarily screened out and crushed into tungsten powder by a pulverizer.
- Tungsten Powder Baking - Place tungsten powder in a professional baking oven for baking.
- Material preparation - Under mechanical pressure, the baked tungsten powder is cold compressed to produce a tungsten billet.
- Processing and Fluorescence Probing - Grinders and tensile testing machines are used to process tungsten blanks such as engraving, bending and curling, and fluorescence probing is used to inspect the optical quality and thickness of thin films.
- Tungsten foil spraying - The prepared tungsten strip is sprayed onto the prepared surface by air pressure.
- Secondary production process - After cold pressing, drilling, micromachining, etc. are required again to improve the quality and specification of tungsten metal foil.
- Final Inspection - Final inspection is carried out on the tungsten metal foil, after passing the inspection, it can be packed and shipped.
3. Working Principle
Tungsten foil is a material used in electronics and vacuum technology, and its working principle is mainly determined by its special physical and chemical properties.
First, due to the high melting point of tungsten (3422°C), it can maintain its structural stability and physical properties under high temperature and vacuum environment. Therefore, tungsten strip is often used as components in high-temperature environments such as thermal resistance materials, radiation shielding materials, and vacuum tube electrodes.
Secondly, tungsten has extremely high density and high absorption capacity, and has a good shielding effect on X-rays, gamma rays and neutrons. Therefore, it can also be used in radiation shielding materials and nuclear science experiments.
In addition, it can also be used as an electrode material. Due to its high electron emission capability, it can be used to manufacture electronic devices such as electron guns, microwave tubes and radio frequency amplifiers.
In summary, the tungsten strip plays an important role as an important material in the fields of high temperature, radiation protection and electronics through its high melting point, high density, high absorption capacity and high electron emission capacity.
4. Express & Payment
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