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Molybdenum Core/Base Component – Computer, Electronic and Optical Product Manufacturing

Component Specifications

Definition

The molybdenum core/base serves as the foundational structural element in tungsten-rhenium target disks, providing mechanical support, thermal management, and electrical conductivity. This component is specifically engineered to withstand extreme thermal cycling (up to 2500°C) and high rotational speeds (typically 3000-10000 RPM) while maintaining dimensional stability and preventing thermal expansion mismatch with the tungsten-rhenium alloy target surface.

Working Principle

The molybdenum core/base operates on principles of thermal conductivity, structural integrity, and rotational stability. It efficiently transfers heat away from the tungsten-rhenium focal spot through its high thermal conductivity (138 W/m·K at 20°C), while providing a rigid mounting platform that maintains precise focal spot positioning during high-speed rotation. The component's low thermal expansion coefficient (4.8×10⁻⁶/K at 20°C) minimizes thermal stress at the interface with the tungsten-rhenium layer.

Materials

High-purity molybdenum (Mo ≥ 99.95%), typically alloyed with small amounts of lanthanum oxide (La₂O₃ ≤ 0.5%) for improved high-temperature strength and recrystallization resistance. Material must meet ASTM B387 specifications for molybdenum and molybdenum alloy plate, sheet, and foil.

Technical Parameters

Density 10.22 g/cm³
Diameter 50-200 mm
Flatness ≤ 0.025 mm
Thickness 5-25 mm
Parallelism ≤ 0.01 mm
Surface Finish Ra ≤ 0.8 μm
Thermal Conductivity ≥ 130 W/m·K at 100°C
Electrical Resistivity 5.2 μΩ·cm at 20°C
Maximum Operating Temperature 2500°C

Standards

ISO 9001, ISO 13485, ASTM B387, DIN 17465

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Molybdenum Core/Base.

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.

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Engineering Analysis

Risks & Mitigation

Thermal fatigue failure
Creep deformation at high temperatures
Interface delamination
Microcrack propagation
Oxidation at elevated temperatures in non-vacuum environments

FMEA Triads

Trigger: Repeated thermal cycling between room temperature and 2500°C
Failure: Thermal fatigue cracks initiating at stress concentration points
Mitigation: Implement optimized fillet radii at transitions, use finite element analysis to minimize stress concentrations, apply surface compressive residual stresses through shot peening

Trigger: Sustained operation at temperatures above 2000°C
Failure: Creep deformation leading to dimensional instability and focal spot drift
Mitigation: Use lanthanum oxide-doped molybdenum for improved high-temperature strength, implement active cooling systems, establish maximum continuous operating temperature limits

Trigger: Thermal expansion mismatch between molybdenum and tungsten-rhenium
Failure: Interface delamination and bond failure
Mitigation: Design with graded transition layers, use diffusion bonding techniques, implement thermal barrier coatings, optimize operating temperature profiles

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 2768-mK, dimensional tolerances ±0.05 mm, surface roughness Ra ≤ 0.8 μm

Test Method

Ultrasonic testing for internal defects per ASTM E317, dimensional verification with CMM per ISO 10360, thermal cycling testing per IEC 60601-2-44, metallurgical analysis per ASTM E3

Buyer Feedback

★★★★☆ 4.6 / 5.0 (38 reviews)

"The Molybdenum Core/Base we sourced perfectly fits our Computer, Electronic and Optical Product Manufacturing production line requirements."

"Found 18+ suppliers for Molybdenum Core/Base on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Molybdenum Core/Base is very thorough, especially regarding technical reliability."

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Frequently Asked Questions

Why is molybdenum used instead of other metals for the core/base?

Molybdenum offers an optimal combination of high melting point (2623°C), excellent thermal conductivity, low thermal expansion, and good mechanical strength at elevated temperatures, making it ideal for withstanding the extreme conditions in rotating anode X-ray tubes.

What are the main failure modes of molybdenum cores/bases?

Primary failure modes include thermal fatigue cracking due to repeated heating/cooling cycles, creep deformation under sustained high-temperature operation, and interface delamination from thermal expansion mismatch with the tungsten-rhenium layer.

How does the molybdenum core/base affect X-ray tube performance?

The core/base directly impacts focal spot stability, heat dissipation efficiency, and tube lifespan. Proper design ensures minimal thermal drift, efficient heat transfer to cooling systems, and reliable operation under continuous high-power conditions.

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Molybdenum Core/Base