Pure tungsten wire is one of many tungsten products. Tungsten is a non-ferrous metal and an important strategic metal. Tungsten ore was called "heavy stone" in ancient times. In 1781, the Swedish chemist Carl William Scheele discovered scheelite and extracted a new elemental acid - tungstic acid. In 1783, the Spanish Depuria discovered wolframite and extracted tungstic acid. In the same year, The reduction of tungsten trioxide with carbon yielded tungsten powder for the first time and named the element. The content of tungsten in the earth's crust is 0.001%. There are 20 kinds of tungsten-containing minerals that have been discovered. Tungsten deposits are generally formed with the activity of granitic magma. After smelting, tungsten is a silvery-white shiny metal with a very high melting point and high hardness. Tungsten is the metal with the highest melting point. Tungsten wire embodies this characteristic of tungsten.
Tungsten is a non-ferrous metal. Usually people divide metals into two categories according to their color and properties: ferrous metals and non-ferrous metals. Ferrous metals mainly refer to iron, manganese, chromium and their alloys, such as steel, pig iron, ferroalloy, cast iron, etc. Metals other than ferrous metals are called non-ferrous metals. Tungsten belongs to the category of non-ferrous metals. The strength and hardness of non-ferrous alloys are generally higher than those of ferrous metals, their resistance is higher than that of ferrous metals, their temperature coefficient of resistance is small, and they have good comprehensive mechanical properties. Therefore, as a non-ferrous metal, tungsten has very high strength and hardness. Because of this characteristic, tungsten carbide with high hardness and strong wear resistance is widely used in cutting tools and mining tools. Tungsten wire is also one of the difficult metal products.
1. Chemical Composition
|
Grade |
W content min, % |
Total impurity elements max, % |
Each element max, % |
|
W1 |
99.95 |
0.05 |
0.01 |
|
W2 |
99.92 |
0.08 |
0.01 |
2. Specification
|
Diameter, mm |
Diameter telorance, % |
Weight ( 200mm ), mg |
Length min, m |
|
0.012−0.06 |
- |
>0.44−10.91 |
700 |
|
0.06−0.1 |
- |
>10.91−30.30 |
400 |
|
0.1−0.15 |
-- |
>30.30−68.18 |
250 |
|
0.15−0.2 |
- |
>68.18−121.20 |
150 |
|
0.2−0.35 |
- |
>121.20−371.19 |
100 |
|
0.35−0.7 |
±1.5 to ±2.5 |
- |
same as 150g |
|
0.7−1.8 ± |
±1.0 to ±2.0 |
- |
same as 20 |
3. Feature
- High-temperature property: according to the specific applications, high-temperature property requirements.
- Diameter consistency. weight deviation of two consecutive 200mm-wire pieces is less than 0. 5% of nominal
- Straightness: Regular tungsten wire in accordance with customers' requirements
- Straightened tungsten wire. for the tungsten wire thinner than 100um. the vertical height of 500mm freely, suspended wire should not be less than 450mm: for the tungsten wire at or thicker than 10oum, the maximum arc height between two points with a distance of 100mm is 10mm
- Surface conditions: smooth surface, free of splits, burrs, cracks, dents, and dots. grease contamination.
4. Manufacture Processes
The processing flow of pure tungsten wire usually includes the following steps:
1) Material preparation: Extract tungsten with a purity of more than 99.95% from pure tungsten raw materials, and then carry out powder metallurgy or smelting into tungsten blanks.
2) Forging process: The tungsten billet is forged several times to form a body with fine grains and uniform density.
3) Cold drawing processing: the tungsten billet is cold drawn into a thick wire rod through a wire drawing machine, and a certain proportion of drawing lubricant is used to maintain its surface lubrication.
4) Heat treatment: The tungsten wire is heated to eliminate the internal stress generated during the stretching process and improve its strength and toughness.
5) Processing and forming: use tungsten wire processing equipment to cut, coil, and shape tungsten wire according to different diameters and shapes.
6) Inspection and packaging: The processed pure tungsten wire is inspected for quality, packaged into standard products, and marked with standard and batch information.
5. Application Fields
Pure tungsten wire is widely used in many fields, especially in the environment of high temperature, high pressure, and high vacuum. The following are several main application areas:
1) Thermal processing: It is used to make filaments, arc processing, etc.
2) Semiconductor: It is used in the semiconductor industry, especially in the manufacture of thermal parts in semiconductor equipment.
3) Medical Devices: It is used in the manufacture of wound healing after surgery.
4) Aerospace: It is used to make turbine blades, rocket nozzles, etc.
The final pure tungsten metal wire products are usually used in high-temperature equipment and electronic devices, such as capacitors, high-power discharge tubes, semiconductor ceramics, and other fields.
Hot Tags: pure tungsten wire, China pure tungsten wire manufacturers, suppliers, Pure Tungsten Wire
