A Complete Analysis of Tungsten Disc for Car Horns

Tungsten discs for car horns are key electrical contact components installed inside car horns. They are typically made of high-purity tungsten or tungsten alloys and are disc-shaped. They are primarily designed to withstand and conduct high-frequency arc shocks, ensuring stable electrical conductivity and long life under frequent start-stop and high-current pulse conditions.

In the electromagnetic drive structure of a car horn, the Tungsten Steel Bar Disc acts as a switch contact. Each time the horn is pressed, current is rapidly conducted and interrupted through the Pure Tungsten Disk's contact surface, generating electromagnetic vibrations and sound waves. Due to the high operating frequency and frequent switching cycles of the horn, the contact material must possess excellent arc tolerance, mechanical strength, and wear resistance, and tungsten precisely meets these requirements.

Powder Petallurgy Tungsten Discs (W) is a high-melting-point metal with an atomic number of 74. Its extremely stable physical and chemical properties give it irreplaceable advantages in car horn contact applications.

1. High Melting Point

Tungsten's melting point is as high as 3422°C, making it resistant to melting or deformation in high-temperature arc environments.

2. High Hardness and Wear Resistance

Vickers hardness can reach 350-400 HV, providing strong resistance to surface wear and the ability to withstand prolonged mechanical shock.

3. Excellent Arc Tolerance

The arc temperature generated during the instantaneous switching of a speaker can reach over 3000°C. Tungsten's high-temperature stability and low evaporation rate significantly reduce contact erosion.

4. Moderate Conductivity

With a resistivity of approximately 5.3 μΩ·cm, while slightly higher than copper and silver, its high-temperature resistance demonstrates excellent performance under high-current pulse conditions.

5. High Density and Minimal Deformation

With a density of 19.3 g/cm³, it exhibits minimal deformation under vibration, helping to maintain a stable contact gap.

The production process for Pure Tungsten Disc for Car Horn requires stringent requirements. The main steps are as follows:

1. Raw Material Selection

Use tungsten powder with a purity of ≥ 99.95% to ensure conductivity and oxidation resistance.

2. Powder Metallurgy Forming

Cold-press the tungsten powder into a billet under high pressure (typically ≥ 200 MPa) to ensure uniform density.

3. High-Temperature Sintering

Sintering is typically performed at a temperature of 2200-2500°C under vacuum or a hydrogen atmosphere to achieve a strong bond between the particles.

4. Precision Machining

CNC turning or grinding is used to precisely control diameter and thickness within tolerances (±0.02 mm).

5. Surface Treatment

Polishing or plating (such as silver or nickel plating) is performed as required to improve conductivity and prevent surface oxidation.

6. Quality Inspection

Performs dimensional inspection, hardness testing, density measurement, resistivity testing, and high-frequency switching life testing.
Life test standard: Stable switching cycles of ≥ 500,000 at 10A to 15A.

1. High-Temperature Arc Erosion Resistance
The Tungsten Rod Slice resists melting under high-temperature arc impacts, exhibiting a low erosion rate and maintaining contact shape and surface flatness.

2. High Mechanical Strength
The Tungsten Metal Small Polished Discs, 99.95% purity, are less susceptible to cracking or deformation under high-speed vibration and frequent impacts of loudspeakers.

3. Long Service Life
In practical applications, the life of Pure Tungsten Disc for Car Horns can be 3 to 5 times longer than that of ordinary copper contacts, reducing maintenance and replacement frequency.

4. Stable Conductivity
Even under extreme temperature fluctuations or in humid environments, contact resistance remains minimal (≤ 15 mΩ).

5. Strong Adaptability
Compatible with various types of automotive horn structures, including electromagnetic horns, pneumatic electric horns, and more.

1. Passenger Car Electric Horn
Used for daily driving instructions and emergency warnings, requiring sensitive response and long life.

2. Commercial and Construction Vehicles

Likely for frequent and prolonged use, they require higher levels of wear resistance and durability.

3. Special Purpose Vehicles

Police cars, fire trucks, ambulances, and other vehicles use their horns frequently, requiring extremely high contact stability.

4. Heavy Machinery

High-volume horns are required in noisy environments, and Iron Tungsten Contact Rivets wafer contacts ensure stable switching under high currents.