INDUSTRY COMPONENT

Ceramic Insulators

High-voltage ceramic insulators for medical X-ray tube cathode assemblies providing electrical isolation and thermal stability.

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Component Specifications

Definition
Ceramic insulators are specialized components in medical X-ray tube cathode assemblies designed to electrically isolate high-voltage elements while withstanding extreme thermal conditions and radiation exposure. They prevent electrical arcing between the cathode filament and other tube components, ensuring stable electron emission for X-ray generation.
Working Principle
Ceramic insulators function by providing high dielectric strength and electrical resistivity to block current flow between conductive parts. Their ceramic composition maintains structural integrity under thermal cycling, while their geometry controls electric field distribution to prevent corona discharge and breakdown in vacuum environments.
Materials
High-purity alumina (Al₂O₃ ≥ 95%) or aluminum nitride (AlN) ceramics with controlled porosity <0.5%, dielectric strength >15 kV/mm, volume resistivity >10¹⁴ Ω·cm at 500°C.
Technical Parameters
  • Leakage Current <1 μA at 100 kV
  • Surface Roughness Ra ≤ 0.4 μm
  • Dielectric Strength ≥18 kV/mm
  • Thermal Conductivity 20-30 W/m·K
  • Vacuum Compatibility Outgassing rate <10⁻⁹ Torr·L/s·cm²
  • Operating Temperature -50°C to 800°C
Standards
ISO 6474-1, ISO 2878, DIN 40685, DIN 40686

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Ceramic Insulators.

ceramic insulator X-ray tube component high-voltage insulation medical device ceramic cathode assembly alumina insulator electrical isolation vacuum compatible Ceramic Insulators Ceramic Insulators 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
  • Dielectric breakdown under voltage spikes
  • Thermal shock cracking
  • Surface contamination causing tracking
  • Mechanical fracture during assembly
FMEA Triads
Trigger: Thermal expansion mismatch between ceramic and metal components
Failure: Cracking at brazed joints leading to vacuum leaks
Mitigation: Use graded seals or compliant metal alloys with matched CTE, implement slow thermal cycling during manufacturing
Trigger: Surface contamination from handling or outgassing
Failure: Reduced surface resistivity causing leakage current and eventual tracking
Mitigation: Implement cleanroom handling, plasma cleaning before assembly, specify low-outgassing adhesives

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Dimensional tolerance ±0.1 mm, surface flatness <5 μm over 25 mm, dielectric tolerance ±5% of rated voltage
Test Method
High-potential testing at 1.5x rated voltage for 60 seconds, thermal cycling (-40°C to 300°C, 100 cycles), helium leak testing <10⁻⁹ mbar·L/s

Buyer Feedback

★★★★☆ 4.9 / 5.0 (17 reviews)

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

"Found 57+ suppliers for Ceramic Insulators on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Ceramic Insulators is very thorough, especially regarding technical reliability."

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Frequently Asked Questions

Why are ceramics preferred over polymers for X-ray tube insulators?

Ceramics offer superior thermal stability (withstanding cathode temperatures >700°C), better radiation resistance, lower outgassing in vacuum, and maintain dielectric properties at high temperatures where polymers degrade.

What causes ceramic insulator failure in X-ray tubes?

Primary failure modes include microcracking from thermal cycling, surface tracking from contamination, dielectric breakdown from voltage surges, and mechanical fracture from assembly stresses or vibration.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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