Tungsten Alloy Rings: High-Density Precision Annular Components

Performance Parameters of Tungsten Alloy Rings

Property	Performance Parameters
Density	16.5 – 18.8 g/cm³ (Adjustable by composition)
Tensile Strength	800 – 1250 MPa
Yield Strength	600 – 950 MPa
Elongation	5% – 25% (Varies with binder phase ratio)
Hardness	HRC 28 – 42 / HV 300 – 480
Melting Point	Tungsten base: 3422°C; Alloy temperature resistance: up to 1800°C+
Thermal Conductivity	70 – 130 W/(m·K) (Higher for W-Cu series)
Coeff. of Thermal Expansion (CTE)	4.5 – 7.5 × 10⁻⁶/°C (Low, excellent dimensional stability)
Radiation Shielding	Significant attenuation for 100 keV – 10 MeV γ-rays
Neutron Absorption	High-efficiency thermal neutron absorption via B, Gd, or Cd doping
Magnetic Property	W-Ni-Cu: Non-magnetic (μ ≤ 1.01); W-Ni-Fe: Controlled micro-magnetism
Radiation Resistance	No swelling or embrittlement under high-energy particle irradiation
Corrosion Resistance	Resistant to acid, alkali, humid heat, and salt spray
Fatigue Strength	Excellent; suitable for high-speed rotation and vibration
Machinability	Supports precision turning, milling, grinding, drilling, and wire cutting
Surface Treatment	Ni/Gold plating, blackening, PVD coating
Sustainability	Non-toxic, zero radioactive pollution, recyclable

II. Classification of Tungsten Alloy Rings

Based on material composition, HAO CARBIDE tungsten alloy rings are categorized into several types, each catering to distinct applications:

l Tungsten-Nickel-Iron (W-Ni-Fe) Rings: Primarily used in general counterweight and inertial systems due to their excellent mechanical properties.

l Tungsten-Nickel-Copper (W-Ni-Cu) Rings: Utilized in non-magnetic medical devices and nuclear medicine collimation scenarios where magnetic interference must be avoided.

l Tungsten-Copper (W-Cu) & Tungsten-Silver (W-Ag) Rings: Mainly applied in environments requiring superior electrical/thermal conductivity and high resistance to arc erosion.

Classification by Material Composition

Type	Typical Composition	Primary Applications
W-Ni-Fe	90–97W + Ni + Fe	Gyro rotors, flywheel counterweight rings (Magnetic)
W-Ni-Cu	90–97W + Ni + Cu	MRI/PET-CT collimators, inertial gyros (Non-magnetic)
W-Cu	70–90W + 10–30Cu	Electronic packaging, switch contacts, plasma-facing rings
W-Re	90–95W + 3–26Re	Hypersonic nozzle supports, X-ray tube anode rotation
W-Ag	60–90W + Ag	High-voltage contacts, resistance welding, vacuum arc chambers
W-based HEA	W-Mo-Ta-Nb-V-Ti, etc.	Nuclear fusion first-wall rings, hypersonic leading-edge supports

III. Performance Comparison with Other Materials

Tungsten alloy rings offer a density far exceeding that of lead, titanium, and steel. Combined with high strength, radiation resistance, high-temperature stability, and environmental friendliness, they hold a significant competitive edge in scenarios requiring high mass within a small volume, robust shielding, or reliability in extreme environments.

l Lead (Pb) Rings: Although dense, lead is toxic and prone to structural deformation.

l Titanium & Steel Rings: These materials lack the necessary density to perform effectively in high-inertia weighting or high-efficiency radiation shielding tasks.

Performance Comparison with Other Materials

Property	Tungsten Alloy Ring	Lead Alloy Ring	Titanium Alloy Ring	Steel Ring
Density	16.5 – 18.5 g/cm³	11.3 g/cm³	4.5 g/cm³	7.8 g/cm³
Eco-friendliness	High (Eco-friendly)	Low (Toxic)	High (Eco-friendly)	High (Eco-friendly)
Mechanical	High strength	Soft, prone to wear	High strength / Low density	Medium strength / Prone to rust
Environment	Radiation/Heat resistant	Not heat resistant	Heat resistant / Poor shielding	Average heat resistance
Precision	Excellent stability	Easily deformed	High precision / Single function	Medium precision
Relative Cost	High	Low	Fairly High	Low

IV. Industrial Applications

HAO CARBIDE tungsten alloy rings, designed in axisymmetric annular or multi-layered nested configurations, are widely deployed across aerospace, nuclear medicine, industrial inspection, nuclear engineering, and precision instrumentation.

Typical applications include:

High-speed inertial rotors

Radiation collimation and shielding

Nuclear control rod absorption

Vibration-damping counterweights

By leveraging high density, superior mechanical/radiation performance, and geometric controllability, these rings achieve high mass and inertia within a compact volume. They provide omnidirectional shielding and ensure long-term reliable service under extreme environmental conditions.

Typical Industrial Applications

Application Field	Typical Use	Function
Aerospace Gyros	High-speed rotor rings, flywheel weights	Provides angular momentum for attitude control
Satellite/Missile Nav	Gyro rotors, accelerometer weighting rings	High inertia in small volume for precision measurement
Aero-engines	Turbine disc damping, blade locking rings	Suppresses high-temp vibration; prevents blade loosening
Nuclear Med Imaging	Focusing/Parallel-hole collimator rings	Constrains -ray direction to improve image resolution
Industrial CT/NDT	Annular collimators, beam-limiting rings	Suppresses scattered radiation; forms clear pencil beams
Nuclear Reactors	Neutron absorption rings, sealing rings	Regulates reaction rate; ensures structural sealing
Radiation Containers	Multi-layered shielding, beam limiters	Omnidirectional shielding; controls beam direction
Accelerators	Neutron collimators, target chamber shielding	Forms directional neutron beams; shields 纬-rays
Vibration Control	Optical platform damping, watch balances	High mass in compact volume to reduce resonance
Defense & Military	Pre-fragmented rings, ammunition rings	Circumferential high-density fragments for lethal effect

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HAO Carbide Co., LTD.

Catherine Tang
Tel: +86-731-22199705
Fax: +86-731-28260602
Mob: +86-13975383023
Email: Catherine@haocarbide.com
Web: www.hao-carbide.com

Address: Building 3, Power Valley Industrial Park, Zhuzhou City, Hunan Province, China