Anode Target Disc: Thermal Capacity 100-500 kJ

Q: Why do anode target discs rotate at high speeds?

High-speed rotation distributes heat across the entire focal track area, preventing localized overheating that could cause melting or deformation. This allows higher power loading, longer exposure times, and extended tube lifespan while maintaining consistent X-ray output quality.

Q: What materials are used for modern anode targets?

Modern targets use tungsten-rhenium alloys (3-10% rhenium) for the focal track due to high melting point and thermal stability. Molybdenum or graphite substrates provide thermal management, while copper or aluminum rotor cores reduce weight and improve conductivity.

Q: How does anode angle affect X-ray tube performance?

The anode angle (typically 7-20°) determines the effective focal spot size and heat dissipation characteristics. Smaller angles create smaller focal spots for higher resolution imaging but reduce heat dissipation capacity. Larger angles improve thermal management but increase focal spot size.

Component Specifications

Definition

The anode target disc is a critical rotating component within the X-ray tube rotor assembly, typically made from tungsten-rhenium or molybdenum alloys. It serves as the focal point where high-energy electrons from the cathode strike, generating X-rays through bremsstrahlung and characteristic radiation. The disc rotates at high speeds (typically 3,000-10,000 RPM) to distribute heat across its surface, preventing localized overheating and melting while maintaining consistent X-ray output. Modern designs incorporate composite structures with graphite substrates for improved thermal dissipation and focal track optimization for specific imaging applications.

Working Principle

Operates on the principle of thermionic emission and bremsstrahlung radiation. Electrons accelerated from the cathode strike the rotating anode disc's focal track, where their kinetic energy converts to X-rays (1-2% efficiency) and heat (98-99%). The rotation spreads thermal load across the entire focal track area, allowing higher power loading and longer tube life. The angle of the target surface (typically 7-20 degrees) affects focal spot size and heat dissipation characteristics.

Materials

Primary focal track: Tungsten-Rhenium alloy (W-3%Re to W-10%Re) for high melting point (3, 422°C) and thermal stability. Substrate: Molybdenum or graphite for thermal management. Bonding layer: Brazing alloys (copper-silver or gold-based) for metallurgical bonding. Rotor core: Copper or aluminum for conductivity and weight reduction.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	50-200 mm
Anode Angle	7-20 degrees
Balance Grade	G2.5 or better
Rotation Speed	3,000-10,000 RPM
Surface Finish	Ra < 0.8 μm
Focal Spot Size	0.3-2.0 mm
Thermal Capacity	100-500 kJ
Operating Temperature	Up to 2,700°C (focal track)

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 16526, IEC 60601-2-28, ASTM E1165, DIN 6868

Parent Products

This component is used in the following industrial products

X-Ray Tube Rotor Assembly

The X-ray tube rotor assembly is a critical rotating component within medical X-ray tubes used in diagnostic imaging equipment.

View Product Details

Engineering Analysis

Risks & Mitigation

Thermal cracking from rapid heating/cooling
Focal track erosion from electron bombardment
Bearing failure due to high-speed rotation
Imbalance causing vibration and noise
Vacuum contamination from material outgassing

FMEA Triads

Trigger: Thermal stress exceeding material limits
Failure: Focal track cracking or deformation
Mitigation: Implement graded material transitions, optimize cooling systems, control ramp-up/down rates, use thermal modeling for design validation

Trigger: Bearing lubrication breakdown at high temperatures
Failure: Rotor seizure or excessive vibration
Mitigation: Use high-temperature lubricants, implement bearing temperature monitoring, design for minimal axial/radial loads, regular maintenance schedules

Trigger: Electron beam focusing instability
Failure: Off-focal radiation reducing image quality
Mitigation: Precise cathode alignment, electromagnetic focusing optimization, real-time beam monitoring, regular calibration protocols

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Focal spot position: ±0.1 mm, Balance: ≤2.5 g·mm/kg, Runout: ≤0.01 mm TIR, Surface roughness: Ra ≤ 0.8 μm

Test Method

X-ray focal spot measurement per IEC 60336, thermal cycling tests, high-speed balance verification, vacuum compatibility testing, material composition analysis via spectroscopy

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

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Manufacturers of Anode Target Disc

Manufacturer profiles associated with Anode Target Disc.

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Frequently Asked Questions

Why do anode target discs rotate at high speeds?