INDUSTRY COMPONENT

Insulator

High-voltage insulator for electron gun applications in vacuum environments

Component Specifications

Definition
A specialized ceramic or glass component designed to electrically isolate and mechanically support high-voltage electrodes within electron guns, preventing arcing and maintaining vacuum integrity in cathode ray tubes, electron microscopes, and particle accelerators
Working Principle
Provides electrical insulation through high dielectric strength materials while maintaining structural stability under thermal stress and vacuum conditions, preventing electron leakage and ensuring precise beam focusing
Materials
Alumina (Al2O3) ceramic (96-99.5% purity), boron silicate glass, or high-purity steatite; may include metalized coatings (tungsten, molybdenum, or nickel) for brazed connections
Technical Parameters
ParameterTypical rangeNotes & selection driver
Surface Roughness<0.4 μm Ra
Volume Resistivity>10^14 Ω·cm
Dielectric Strength>15 kV/mm
Vacuum Compatibility<10^-6 Torr
Operating Temperature-200°C to 500°C
Thermal Expansion Coefficient6-8 × 10^-6/°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 14744, DIN 4000-7

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Dielectric breakdown under high voltage
  • Thermal stress cracking
  • Vacuum leakage
  • Surface charge accumulation
FMEA Triads
Trigger: Surface contamination from handling
Failure: Reduced dielectric strength leading to arcing
Mitigation: Implement cleanroom handling procedures and plasma cleaning before assembly
Trigger: Thermal expansion mismatch with metal electrodes
Failure: Cracking during temperature cycling
Mitigation: Use graded seals or compliant metal layers between materials

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
±0.1 mm dimensional, ±0.5° angular alignment
Test Method
High-potential testing at 1.5× operating voltage, helium leak detection <10^-9 mbar·L/s, thermal cycling 50 cycles

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Insulator

Manufacturer profiles associated with Insulator.

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Frequently Asked Questions

What causes insulator failure in electron guns?

Primary causes include dielectric breakdown from surface contamination, thermal cracking due to coefficient mismatch, and vacuum leaks from micro-fractures

Can different insulator materials be interchanged?

No - material substitutions require complete redesign due to differences in thermal expansion, dielectric properties, and brazing compatibility

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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