INDUSTRY COMPONENT

Tungsten Filament

Tungsten filament is a critical heating element in medical X-ray tube cathodes that emits electrons through thermionic emission.

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Component Specifications

Definition
A tungsten filament is a precisely engineered wire component within the cathode assembly of medical X-ray tubes. When electrically heated to incandescence (typically 2200-2500°C), it emits electrons via thermionic emission. These electrons are then accelerated toward the anode target to generate X-rays through bremsstrahlung and characteristic radiation processes. The filament's design directly impacts electron beam focus, tube current stability, and overall X-ray output quality.
Working Principle
Thermionic emission: When heated to high temperatures by electrical current, tungsten releases electrons from its surface. These free electrons form an electron cloud (space charge) that is focused and accelerated toward the anode by high voltage, creating X-rays upon impact.
Materials
Pure tungsten (W) or thoriated tungsten (W-ThO₂, typically 1-2% thorium oxide). Tungsten is selected for its high melting point (3422°C), low vapor pressure at operating temperatures, and excellent thermionic emission properties.
Technical Parameters
  • Length 10-50 mm
  • Diameter 0.1-0.5 mm
  • Resistance 1-10 Ω at room temperature
  • Life Expectancy 1000-5000 hours
  • Operating Temperature 2200-2500°C
  • Emission Current Density 0.5-2 A/cm²
Standards
ISO 16526-1, DIN 6836-2, IEC 60601-2-54

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Tungsten Filament.

tungsten filament X-ray tube cathode thermionic emission medical imaging components electron emitter tungsten wire X-ray generator Tungsten Filament in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Medical X-Ray Tube Cathode Assembly

Electron emission source for medical X-ray generation

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Engineering Analysis

Risks & Mitigation
  • Filament burnout from overheating
  • Uneven electron emission due to contamination
  • Reduced lifespan from frequent on/off cycling
  • Arcing from tungsten vapor deposition on insulators
FMEA Triads
Trigger: Excessive operating temperature or voltage
Failure: Rapid tungsten evaporation leading to filament thinning and breakage
Mitigation: Implement temperature monitoring circuits, use automatic exposure control, maintain proper cooling
Trigger: Mechanical vibration during operation
Failure: Filament deformation or fracture
Mitigation: Secure mounting with vibration dampeners, ensure proper tube balancing

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Diameter ±0.01 mm, Length ±0.5 mm, Resistance ±5%
Test Method
Emission uniformity test at 10% below rated voltage, visual inspection for surface defects, resistance verification at 20°C

Buyer Feedback

★★★★☆ 4.5 / 5.0 (23 reviews)

"Great transparency on the Tungsten Filament components. Essential for our Computer, Electronic and Optical Product Manufacturing supply chain."

"The Tungsten Filament we sourced perfectly fits our Computer, Electronic and Optical Product Manufacturing production line requirements."

"Found 55+ suppliers for Tungsten Filament on CNFX, but this spec remains the most cost-effective."

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Frequently Asked Questions

Why is tungsten used instead of other metals for X-ray filaments?

Tungsten has the highest melting point of all metals (3422°C), maintains structural integrity at operating temperatures, exhibits excellent thermionic emission efficiency, and has low vapor pressure that minimizes tube contamination.

What happens when a tungsten filament fails?

Filament failure typically results from thinning/breaking due to evaporation or thermal stress, causing reduced/no electron emission. This leads to insufficient X-ray output, requiring tube replacement as filaments cannot be serviced separately in sealed tubes.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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