PVD Coated Tungsten Wire for Vacuum Evaporation and High Temperature Heating

1. Why Twist Tungsten Wire? Structural Advantages

Single-strand tungsten wire can become notoriously brittle and limited in capacity when exposed to intense heat.

Twisting multiple strands yields four critical engineering benefits:

Capillary Effect (Liquid Retention)

In vacuum deposition, molten low-melting-point metals such as aluminum are held within the twisted valleys of the wire.

This prevents dripping and ensures controlled evaporation through capillary action.

Larger Surface Area

Stranding multiple wires increases surface area significantly compared to a single wire of equal diameter.

This improves thermal radiation efficiency and evaporant material capacity.

Enhanced Thermal Uniformity

Current distribution becomes more even across strands.

This reduces hot spots and improves filament lifespan.

Superior Mechanical Flexibility

Twisted structure redistributes mechanical stress effectively.

It allows bending and coiling without breaking under controlled conditions.

2. Common Stranded Configurations

Twisted Tungsten Wire is categorized by strand count and diameter.

2-Strand (2-Ply): Balanced flexibility with deep capillary grooves.

3-Strand (3-Ply): Stable triangular structure with strong liquid retention.

4-Strand to 9-Strand+: Heavy-duty industrial evaporation and heating systems.

Example RFQ: 3-Strand x 0.76mm refers to three wires of 0.76mm each twisted into one cord.

3. Primary Applications