Industry-Verified Manufacturing Data (2026)

Medical X-Ray Tube Cathode Assembly

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Medical X-Ray Tube Cathode Assembly used in the Manufacture of Irradiation, Electromedical and Electrotherapeutic Equipment sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Medical X-Ray Tube Cathode Assembly is characterized by the integration of Tungsten Filament and Molybdenum Focusing Cup. In industrial production environments, manufacturers listed on CNFX commonly emphasize Tungsten filament construction to support stable, high-cycle operation across diverse manufacturing scenarios.

Electron emission source for medical X-ray generation

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Product Specifications

Technical details and manufacturing context for Medical X-Ray Tube Cathode Assembly

Definition
A critical sub-assembly within medical X-ray tubes that generates the electron beam required for X-ray production. This component consists of a heated filament and focusing cup that emits and directs electrons toward the anode target. It directly determines the quality, intensity, and stability of the X-ray output in diagnostic imaging equipment. Proper cathode design is essential for achieving consistent radiographic results and minimizing patient radiation exposure.
Working Principle
Electrical current heats the tungsten filament to thermionic emission temperatures, releasing electrons that are focused and accelerated toward the anode by the focusing cup's electrostatic field.
Common Materials
Tungsten filament, Molybdenum focusing cup, Ceramic insulators, Nickel support wires
Technical Parameters
  • Maximum operating voltage rating (kV) Standard Spec
  • Maximum filament current capacity (mA) Standard Spec
Components / BOM
  • Tungsten Filament
    Electron emission source when heated
    Material: Pure tungsten wire
  • Molybdenum Focusing Cup
    Electrostatically focuses electron beam
    Material: High-purity molybdenum
  • Ceramic Insulators
    Electrical isolation between components
    Material: Alumina ceramic
  • Support Structure
    Mechanical mounting and alignment
    Material: Nickel alloy
Engineering Reasoning
Filament current: 3.2-6.8 A at 10-15 V, Electron emission: 100-500 mA, Vacuum pressure: <1×10⁻⁶ Torr
Filament temperature exceeds 2600°C (tungsten sublimation threshold), Cathode current density >4 A/cm² (space charge limit), Vacuum pressure >1×10⁻⁴ Torr (gas ionization threshold)
Design Rationale: Thermionic emission degradation due to tungsten filament evaporation at high temperatures (Richardson-Dushman equation), Space charge limitation (Child-Langmuir law) at excessive current densities, Gas ionization causing arcing at elevated vacuum pressures
Risk Mitigation (FMEA)
Trigger Filament overheating due to prolonged exposure >2600°C
Mode: Tungsten filament thinning and eventual open circuit
Strategy: Dual-filament redundant design with automatic switching at 2500°C threshold
Trigger Vacuum degradation to >1×10⁻⁴ Torr due to seal failure
Mode: Gas ionization arcing causing cathode spot erosion
Strategy: Hermetic ceramic-metal brazed seals with helium leak rate <1×10⁻⁹ mbar·L/s

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Medical X-Ray Tube Cathode Assembly.

X-ray tube electron emitter X-ray filament assembly Medical cathode assembly medical X-ray tube cathode assembly replacement tungsten filament cathode for X-ray tubes molybdenum focusing cup medical imaging electron emission source X-ray generation X-ray tube cathode assembly specifications

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
current: 0.1-1000 mA typical
voltage: 40-150 kV typical
pressure: High vacuum required (typically <10^-5 Torr)
temperature: Ambient to 150°C (operating), -40°C to 200°C (storage)
filament heating: 2-12 V, 2-10 A typical
Media Compatibility
✓ High vacuum environments ✓ Medical X-ray generator housings ✓ Clean room assembly conditions
Unsuitable: Atmospheric pressure or non-vacuum environments
Sizing Data Required
  • Required X-ray tube voltage (kV)
  • Required tube current (mA)
  • Target focal spot size (mm)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Cathode filament degradation
Cause: Thermal fatigue from repeated heating/cooling cycles leading to embrittlement and eventual breakage, often accelerated by tungsten evaporation at high temperatures or improper filament current settings.
Insulation breakdown in cathode assembly
Cause: Carbon tracking or dielectric failure due to high-voltage arcing, contamination from outgassing of materials, or moisture ingress compromising electrical isolation between cathode components and ground.
Maintenance Indicators
  • Audible arcing or popping sounds during tube operation indicating electrical discharge
  • Visible darkening or metallic deposits on tube envelope near cathode, suggesting filament evaporation or sputtering
Engineering Tips
  • Implement strict warm-up/cool-down protocols and avoid rapid cycling to minimize thermal stress on tungsten filaments
  • Maintain optimal vacuum integrity through regular high-voltage conditioning and monitoring of tube current stability to prevent insulation degradation

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality Management Systems IEC 60601-2-28:2017 - Medical electrical equipment - Part 2-28: Particular requirements for the basic safety and essential performance of X-ray tube assemblies for medical diagnosis ASTM F640-12(2017) - Standard Test Methods for Determining Radiopacity for Medical Use
Manufacturing Precision
  • Cathode filament alignment: +/-0.05mm relative to anode target
  • Focusing cup concentricity: 0.1mm total indicator runout
Quality Inspection
  • High-voltage leakage test at 125% rated voltage
  • X-ray output consistency test using calibrated dosimeter

Factories Producing Medical X-Ray Tube Cathode Assembly

Verified manufacturers with capability to produce this product in China

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✓ 96% Supplier Capability Match Found

T Technical Director from Australia Jan 02, 2026
★★★★★
"Great transparency on the Medical X-Ray Tube Cathode Assembly components. Essential for our Manufacture of Irradiation, Electromedical and Electrotherapeutic Equipment supply chain."
Technical Specifications Verified
P Project Engineer from Singapore Dec 30, 2025
★★★★☆
"The Medical X-Ray Tube Cathode Assembly we sourced perfectly fits our Manufacture of Irradiation, Electromedical and Electrotherapeutic Equipment production line requirements. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
S Sourcing Manager from Germany Dec 27, 2025
★★★★★
"Found 28+ suppliers for Medical X-Ray Tube Cathode Assembly on CNFX, but this spec remains the most cost-effective."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

6 sourcing managers are analyzing this specification now. Last inquiry for Medical X-Ray Tube Cathode Assembly from Mexico (1h ago).

Frequently Asked Questions

What is the typical lifespan of this medical X-ray tube cathode assembly?

Our cathode assemblies typically offer 10,000+ hours of operational lifetime when used within specified emission current and temperature parameters, ensuring reliable performance for medical imaging systems.

How does the molybdenum focusing cup improve X-ray tube performance?

The molybdenum focusing cup precisely directs electron flow toward the anode, increasing X-ray generation efficiency and producing sharper diagnostic images while maintaining thermal stability at high operating temperatures.

What are the key specifications for proper cathode assembly installation?

Critical specifications include: Emission Current (mA range), Filament Current (A), Filament Voltage (V), Focusing Cup Voltage (V), and Operating Temperature (°C). Always consult manufacturer guidelines for specific equipment compatibility.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Manufacture of Irradiation, Electromedical and Electrotherapeutic Equipment sector.

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