INDUSTRY COMPONENT

Bonding Layer

Bonding layer for tungsten-rhenium target disks in X-ray tubes and medical imaging equipment.

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Component Specifications

Definition
A specialized adhesive interface layer that permanently bonds tungsten-rhenium alloy target disks to their copper heat sinks in rotating anode X-ray tubes. This component ensures optimal thermal conductivity while maintaining structural integrity under extreme thermal cycling (up to 2500°C surface temperatures) and centrifugal forces (up to 10,000 RPM).
Working Principle
The bonding layer functions as a thermal and mechanical interface that transfers heat from the tungsten-rhenium target disk to the copper heat sink through conductive heat transfer. It maintains adhesion through differential thermal expansion management, using compliant materials that accommodate the mismatch between tungsten-rhenium (CTE: 4.5×10⁻⁶/K) and copper (CTE: 17×10⁻⁶/K) while preventing delamination under operational stresses.
Materials
High-temperature brazing alloys: Silver-copper eutectic (Ag72Cu28), Gold-copper (Au80Cu20), or specialized nickel-based alloys with titanium/vanadium additives for enhanced wetting and bonding strength. Thickness typically 50-150 μm.
Technical Parameters
  • Void Content <2%
  • Bond Strength ≥80 MPa at 400°C
  • Thickness Tolerance ±10 μm
  • Thermal Conductivity ≥200 W/m·K
  • Thermal Cycling Endurance >50,000 cycles (20°C to 400°C)
  • Operating Temperature Range -50°C to 600°C
Standards
ISO 9712, ASTM E8, DIN 50125, ISO 17672

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bonding Layer.

target bonding layer tungsten-rhenium target X-ray tube component medical imaging equipment thermal interface material rotating anode bonding high-temperature adhesive Bonding Layer Bonding Layer in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Tungsten-Rhenium Target Disk

A specialized rotating disk within medical X-ray tube anode assemblies that generates X-rays through electron bombardment.

View Product Details

Piezoelectric Stack

A multi-layer assembly of piezoelectric ceramic elements that generates precise linear displacement when voltage is applied.

View Product Details

Vibration Isolators

Components designed to reduce or eliminate the transmission of vibration from a vibrator/exciter to surrounding structures or equipment.

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Engineering Analysis

Risks & Mitigation
  • Delamination under thermal stress
  • Void formation during brazing
  • Intermetallic compound formation reducing ductility
  • Thermal fatigue cracking
  • Inadequate wetting leading to poor adhesion
FMEA Triads
Trigger: Insufficient surface preparation or contamination
Failure: Poor adhesion leading to delamination
Mitigation: Implement strict cleaning protocols (ultrasonic cleaning in acetone/isopropanol), plasma surface activation, and controlled atmosphere brazing (vacuum or inert gas)
Trigger: Thermal expansion mismatch stress
Failure: Cracking or debonding during thermal cycling
Mitigation: Use compliant interlayer materials, graded bonding approaches, and finite element analysis to optimize thickness and material selection for stress distribution
Trigger: Excessive intermetallic formation
Failure: Brittle interface reducing mechanical strength
Mitigation: Control brazing temperature/time profiles, use barrier layers (nickel, titanium), and select alloys with slower diffusion rates

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Thickness: ±10 μm, Flatness: <5 μm over 100 mm diameter, Void area: <2% of bond area
Test Method
Ultrasonic testing per ASTM E317, Shear strength testing per ISO 4587 at elevated temperatures, Thermal cycling per IEC 60601-2-54, Microstructural analysis per ASTM E3

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

Why is the bonding layer critical in tungsten-rhenium target disks?

The bonding layer prevents target disk delamination under extreme thermal cycling (up to 2500°C surface temperatures) and centrifugal forces (up to 10,000 RPM), ensuring continuous heat transfer to the copper heat sink and preventing catastrophic failure in medical X-ray equipment.

What materials are used for high-performance bonding layers?

High-temperature brazing alloys like silver-copper eutectic (Ag72Cu28) or gold-copper (Au80Cu20) are standard, with nickel-based alloys containing titanium/vanadium additives for enhanced wetting properties and oxidation resistance at elevated temperatures.

How is bonding layer quality verified?

Quality is verified through ultrasonic testing (void detection), shear strength testing at elevated temperatures, thermal cycling endurance tests, and microstructural analysis using scanning electron microscopy to ensure proper alloy diffusion and interface integrity.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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