Basket Type Tungsten Stranded Wire Heating Element

Description of Basket Type Tungsten Stranded Wire Heating Element

The stranded construction gives you a larger wetted surface than solid wire, so your evaporant spreads evenly instead of balling up in one hot spot. That means more consistent film thickness across your substrate and fewer interrupted runs because the wire burned through at the center. You also get better load capacity for heavier charges without sagging.

We form each basket to standard or custom dimensions, with looped or hooked ends that seat firmly in your electrode clamps—no slipping, no cold spots at the contact point. The wire is stress-relieved before forming, so it doesn't relax and lose tension when you hit operating temperature.

If you're evaporating aluminum, silver, or gold and tired of replacing baskets mid-shift, send us your source geometry and typical power settings. We'll match the basket to your electrodes and suggest a wire diameter that balances evaporation rate with service life.

Features of Basket Type Tungsten Stranded Wire Heating Element

High-temperature stability: Capable of withstanding temperatures exceeding 2000°C for extended periods in a vacuum or inert gas atmosphere without easily softening or deforming.

Rapid thermal response: Low thermal inertia allows for heating within seconds upon energization; supports both continuous operation and pulsed heating modes.

Load-bearing capacity and uniformity: The basket structure securely holds sheet or filament-like coating materials and provides a relatively uniform temperature field, minimizing material spattering caused by localized overheating.

Chemical inertness: Does not undergo vigorous chemical reactions with most metal coating materials in high-temperature vacuum environments, ensuring the purity of the coating.

Applications of Basket Type Tungsten Stranded Wire Heating Element

Vacuum Evaporation: Mirror manufacturing (silver/aluminum coating), optical lens coating, semiconductor metallization, and decorative coating (mobile phone casings, toys, etc.).

Electronics and Photovoltaics: CRT manufacturing, specific heat treatment stages in photovoltaic module production, and electronic component packaging.

Scientific Research and Specialty Processes: Heat sources for crystal growth and high-temperature evaporation sources for materials science experiments.

Specifications of Basket Type Tungsten Stranded Wire Heating Element

Material Purity: Typically made from pure tungsten wire or doped tungsten wire (e.g., Th-W, La-W) with a purity of ≥99.95%, featuring an extremely high melting point (3410°C) and low vapor pressure.

Construction: Formed by precisely stranding 2–4 (or more) fine tungsten wires—with controlled twist direction and pitch—and then bending them into a "basket" structure to maximize the heated surface area and the capacity for holding the coating material.

Operating Mode: Powered by low voltage (<10V) and high current (hundreds of amperes), the filament rapidly heats up to 600°C–2000°C+ via resistive heating, causing the coating material (such as aluminum, chromium, or gold) placed inside the basket to melt and evaporate.