Vacuum Coating Industry

Application Overview of Tungsten and Molybdenum Products in the Vacuum Coating Industry

1. Main Application Areas

Evaporation Sources and Heating Elements:

Tungsten and molybdenum wires and rods are used in resistive heating evaporation sources, capable of withstanding high temperatures without deformation.

Mo/W plates or crucibles serve as containers for materials in high-temperature evaporation or sputtering processes.

Targets and Evaporation Materials:

Mo and W can be used as sputtering targets in physical vapor deposition (PVD) processes.

They withstand high-temperature evaporation, ensuring purity and stability of the thin films.

Supports and Structural Components:

Internal supports, fixtures, and hangers in vacuum chambers are often made of Mo or W to minimize thermal expansion and increase service life. 

2. Performance Advantages

High Melting Point and High-Temperature Strength: Tungsten melts at 3422°C, molybdenum at 2623°C, allowing stable operation under high-temperature evaporation.

Good Thermal Conductivity: Ensures uniform heating and prevents local overheating.

Low Vapor Pressure: Minimizes evaporation in a vacuum environment, ensuring film quality.

Corrosion Resistance: Stable in most evaporation materials and gaseous environments. 

3. Application Examples 

Optical thin film deposition: Mo plates used as crucible supports to improve evaporation uniformity.

Semiconductor device manufacturing: W targets for metal layer deposition.

Decorative coatings: Tungsten wire resistive heaters used for chrome or gold plating processes.

Overall, tungsten and molybdenum products are indispensable high-temperature durable components in vacuum coating equipment, significantly enhancing equipment life and film quality.