Introducción al polvo de wolframio puro


Pure tungsten powder offers the highest density, strength, and thermal properties among metals. This guide provides a detailed overview of unalloyed tungsten powder for industrial applications.

Introducción al polvo de wolframio puro

Pure tungsten powder contains >99.9% tungsten with minimal impurities. Key properties:

  • Extremely high density of 19.3 g/cc
  • Highest melting point of all metals – 3422°C
  • Resistencia a altas temperaturas
  • Excelente conductividad térmica
  • Bajo coeficiente de dilatación térmica
  • Buena resistencia a la corrosión y a la oxidación

Benefits over alloyed powders:

  • Superior thermal properties
  • Improved electrical conductivity
  • Higher density and purity
  • Better sintered strength
  • Avoidance of alloying elements

With its unsurpassed density and temperature resistance, pure tungsten enables high performance applications across industries.

polvo de tungsteno puro

Tipos de Polvo de wolframio puro

Various grades of pure tungsten powder:

Types of Pure Tungsten Powder

TipoPurezaTamaño de las partículasMorfología
Puro99.9% W1-150 μmIrregular, angular
Ultrafino99.9% W<10 μmEsférica
Nanopolvo>99.9% W<100 nmEsférica
Alta pureza99.95-99.99% W1-45 μmSponge-like

Purity levels range from 99.9% to 99.999% tungsten content. Particle size, shape, and production method can be varied based on application.

Composition of Pure Tungsten Powder

Typical composition of pure tungsten powder:

  • Tungsten (W) – 99.9% to 99.999%
  • Oxygen (O) – 500-1000 ppm
  • Carbon (C) – 100-300 ppm
  • Nitrogen (N) – 20-100 ppm
  • Hydrogen (H) – 20-100 ppm
  • Potassium (K) – 20-50 ppm
  • Sodium (Na) – 10-50 ppm

Higher purity grades minimize oxygen and other interstitials for better ductility and corrosion resistance.

Properties of Pure Tungsten Powder

Properties of Pure Tungsten Powder

Densidad19,3 g/cc
Punto de fusión3422°C
Conductividad térmica173 W/mK
Resistividad eléctrica5.6 μΩ-cm
Resistencia a la tracción550-620 MPa
Módulo elástico400 GPa
Coeficiente de dilatación térmica4.5 x 10-6/K

The extreme density, thermal properties, strength, and temperature resistance make pure tungsten suitable for high performance applications.

Characteristics of Pure Tungsten Powder

Characteristics of Pure Tungsten Powder

Tamaño de las partículas1-150 μmSmaller sizes improve sintering
Forma de las partículasVaried – angular, sphericalImpacts density and flow
Densidad aparente3-4 g/ccIndicates compaction properties
Densidad del grifo9-11 g/ccAlta densidad de empaquetado
Caudal20-25 s/50gMeasure of powder flowability
Contenido de oxígeno<1000 ppmAffects ductility and strength

Controlling size distribution, shape, surface area, density, and oxygen content is crucial for pure tungsten powder functionality.

Specifications of Pure Tungsten Powder

Pure Tungsten Powder Specifications

Tungsten content>99,9%ASTM B763
Tamaño de las partículas1-10 µmASTM B213
Densidad aparente>3 g/ccASTM B212
Densidad del grifo>9 g/ccMPIF 04
Caudal<25 s/50gASTM B213
Contenido de oxígeno<1000 ppmASTM B939

Compliance with standardized specifications ensures batch-to-batch consistency and suitability for industrial applications.

Particle Sizes of Pure Tungsten Powder

Common particle size ranges:

Pure Tungsten Powder Particle Sizes

TamañoDescripciónUsos típicos
1-10 µmUltrafine gradeFabricación aditiva
10-25 μmGrado finoPowder injection molding
25-45 μmGrado medioHerramientas de corte
45-150 μmGrado gruesoAleaciones pesadas de tungsteno

Smaller particles sizes improve sintering and material properties but reduce flowability. Larger particles offer better packing density.

Grados de Polvo de wolframio puro

Grades of Pure Tungsten Powder

GradoPurity (%W)Oxígeno (ppm)Tamaño de las partículas (μm)

CP – Crude powder, RMP – Reactor melt powder, SP – Sodium-reduced powder, EL-Grade – High purity

Higher purity reduces impurities and contamination for improved performance.

Global Standards for Pure Tungsten Powder

Key standards for pure tungsten powder:

  • ASTM B763 – Standard specification for pure tungsten powder
  • ISO 18274 – Chemical analysis of pure tungsten powders
  • MPIF Standard 55 – Material standards for tungsten powder
  • ASTM B939 – Guide to characterization of tungsten powder
  • GB/T 4408 – Chinese standard for tungsten powders

These help ensure quality for different applications worldwide. Customized powders can also be produced as per requirements.

Applications of Pure Tungsten Powder

Applications of Pure Tungsten Powder

AeroespacialBlindaje contra las radiaciones, contrapesos
AutomociónVibration damping in vehicles
ElectrónicaHeat sinks, contacts, electrodes
MilitarKinetic energy penetrators, ordnance
FabricaciónCutting tools, dies, tooling
Petróleo y gasHigh density drilling mud additive

Pure tungsten’s extreme density and temperature resistance make it ideal for high-performance parts and components across sectors.

Suppliers of Pure Tungsten Powder

Leading Suppliers of Pure Tungsten Powder

HC StarckGermany, USA
Tungsteno BuffaloEE.UU.
Tungsteno del Medio OesteEE.UU.
Zhuzhou Cemented CarbideChina

These established manufacturers offer various pure tungsten powder types and can customize grades based on purity, particle size, and property requirements.

Cost Analysis of Pure Tungsten Powder

Pure Tungsten Powder Pricing

GradoPrecio por kg
CP (99.9% W)$100-150
RMP (99.95% W)$150-200
SP (99.98% W)$200-300
EL-Grade (99.99% W)$300-500

Pricing depends on purity, particle characteristics, supplier, and order volume. Prices are higher for finer particle sizes and higher purity.

Pros and Cons of Pure Tungsten Powder

Advantages of Pure Tungsten Powder

  • Superior thermal conductivity and temperature resistance
  • Improved strength and ductility over alloyed grades
  • Highest density of all metallic powders
  • Environmentally stable and inert
  • Better finishing and surface roughness
  • Can be recycled from scrap and waste

Limitations of Pure Tungsten Powder

  • Very expensive compared to other powders
  • Challenging to process due to high melting point
  • Lower fracture toughness than alloyed tungsten
  • Limited global supply and availability
  • Requires handling precautions due to dust explosion risks
  • Difficult to machine finished parts

For critical applications where performance outweighs cost, unalloyed tungsten is the material of choice. Proper precautions are necessary during handling and processing.

Comparison of Pure Tungsten Powder with Other Metals

Comparison With Alternative Metal Powders

Densidad (g/cc)19.310.316.6
Melting point (°C)342226172996
Conductividad térmica (W/mK)17313857
Electrical resistivity (μΩ-cm)5.65.713
Precio por kg$100-$500$30-$100$250-$500

Tungsten outperforms other refractory metals on key thermal and mechanical characteristics but with higher cost.

polvo de tungsteno puro

Preguntas frecuentes

Q: How is pure tungsten powder produced?

A: Pure tungsten is mainly produced by reduction of tungsten oxide using hydrogen. Additional steps of crushing, milling, annealing, and blending achieve the desired powder characteristics.

Q: What is pure tungsten powder used for?

A: Key applications include radiation shielding, counterweights, tooling, cutting tools, grinding media, tungsten heavy alloys, electrical contacts, and heating elements.

Q: What precautions are needed when working with tungsten powder?

A: Tungsten powder poses explosion and inhalation risks requiring protective gear, ventilation, and inert gas glove boxes for storage and handling. Appropriate fire safety measures are essential.

Q: What are the different particle sizes available for pure tungsten powder?

A: Particle sizes range from 1-10 microns for ultrafine, 10-25 microns for fine, 25-45 microns for medium, and 45-150 microns for coarse fractions based on application requirements.

Q: Is pure tungsten powder more expensive than tungsten carbide?

A: Yes, pure tungsten powder costs 2-4 times higher than tungsten carbide powders. However, properties like higher density and electrical/thermal conductivity justify the added cost.

Q: What purity levels are commercially available?

A: Common purity levels are 99.9% (CP grade), 99.95% (RMP grade), 99.98% (SP grade), and 99.99% (EL grade) tungsten content. Higher purity further increases cost.

Q: Can pure tungsten powder be 3D printed?

A: Yes, high purity tungsten powders in the 10-45 micron range can be used for laser powder bed fusion and binder jetting additive manufacturing with proper parameter optimization.

Q: What post-processing steps are used for pure tungsten parts?

A: Sintered tungsten components are finished by grinding, lapping, polishing, and other methods to achieve tight dimensional and surface tolerance requirements.

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Correo electrónico

MET3DP Technology Co., LTD es un proveedor líder de soluciones de fabricación aditiva con sede en Qingdao, China. Nuestra empresa está especializada en equipos de impresión 3D y polvos metálicos de alto rendimiento para aplicaciones industriales.

Solicite información para obtener el mejor precio y una solución personalizada para su empresa.

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