Tungsten filament wire is a heating wire made of tungsten, commonly used in light bulbs in lighting equipment. Tungsten has a very high melting point and corrosion resistance, which can withstand high temperatures and long-term use. In lighting fixtures, tungsten filaments are heated to very high temperatures, which emit visible light. Due to the conductivity and stability of tungsten wire, it is also widely used in other fields that require heating, such as radiators, ovens, and electric soldering irons.

1. Physical properties

1) High melting point: The melting point of tungsten is 3410°C, which is the highest among all metals

2) High Density: The density of tungsten is 19.2 g/cubic centimeter, which is the highest among all metals

3) High strength: Tungsten has excellent strength and hardness, and can maintain good mechanical properties at high temperatures

4) Corrosion resistance: Tungsten has high stability and can exist stably for a long time in oxidizing atmosphere, acid-base environment and high temperature.

2. Chemical properties

1) Not easy to be oxidized: Tungsten has a high redox ability, and it is easy to form a stable tungsten oxide film to protect the tungsten wire from being oxidized

2) Good corrosion resistance in strong acid and strong alkali: tungsten can remain stable in strong acid and strong alkali for a long time, and is not easy to corrode

3) Not easy to be broken down by electrons: Tungsten has high electron emission efficiency and is not easy to be broken down by electrons

4) Small thermal expansion coefficient: Tungsten has a small thermal expansion coefficient and can maintain a stable structure at high temperatures.

Generally speaking, tungsten wire has the characteristics of high-temperature resistance, oxidation resistance, corrosion resistance, and high strength, and is an ideal material for electronics and light sources.

3. Manufacture Processes

Tungsten filament wire is a material used to make light bulbs. Its production process includes the following steps:

Select high-quality tungsten material and heat it to a high-temperature state.
The tungsten material is drawn into filaments using a wire drawing machine.
After tungsten wire surface treatment and oven baking, the tungsten filament has better physical and chemical properties.

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4. Working Principle

The working principle of tungsten filament wire is that when an electric current passes through the tungsten filament, the tungsten filament will heat up. As the current increases, the temperature of the tungsten wire will gradually increase, and finally reach the working temperature of the filament. The temperature of the tungsten filament usually reaches more than 2000 degrees Celsius, which makes the bulb's incandescent filament glow brightly.

5. Application Field

Tungsten filament filaments are widely used in various light bulbs, heaters, vacuum equipment and electronic devices and other fields. It has excellent properties such as high strength, high melting point, and high corrosion resistance, and it performs well in harsh working environments such as high temperature, high pressure, and strong vibration.