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.

Tipos de Polvo de wolframio puro

Various grades of pure tungsten powder:

Types of Pure Tungsten Powder

Tipo	Pureza	Tamaño de las partículas	Morfología
Puro	99.9% W	1-150 μm	Irregular, angular
Ultrafino	99.9% W	<10 μm	Esférica
Nanopolvo	>99.9% W	<100 nm	Esférica
Alta pureza	99.95-99.99% W	1-45 μm	Sponge-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

Propiedad	Valor
Densidad	19,3 g/cc
Punto de fusión	3422°C
Conductividad térmica	173 W/mK
Resistividad eléctrica	5.6 μΩ-cm
Resistencia a la tracción	550-620 MPa
Módulo elástico	400 GPa
Coeficiente de dilatación térmica	4.5 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

Parámetro	Detalles	Significado
Tamaño de las partículas	1-150 μm	Smaller sizes improve sintering
Forma de las partículas	Varied – angular, spherical	Impacts density and flow
Densidad aparente	3-4 g/cc	Indicates compaction properties
Densidad del grifo	9-11 g/cc	Alta densidad de empaquetado
Caudal	20-25 s/50g	Measure of powder flowability
Contenido de oxígeno	<1000 ppm	Affects 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

Parámetro	Valores	Estándar
Tungsten content	>99,9%	ASTM B763
Tamaño de las partículas	1-10 µm	ASTM B213
Densidad aparente	>3 g/cc	ASTM B212
Densidad del grifo	>9 g/cc	MPIF 04
Caudal	<25 s/50g	ASTM B213
Contenido de oxígeno	<1000 ppm	ASTM 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

Tamaño	Descripción	Usos típicos
1-10 µm	Ultrafine grade	Fabricación aditiva
10-25 μm	Grado fino	Powder injection molding
25-45 μm	Grado medio	Herramientas de corte
45-150 μm	Grado grueso	Aleaciones 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

Grado	Purity (%W)	Oxígeno (ppm)	Tamaño de las partículas (μm)
CP	99.9	700-1200	1-150
RMP	99.95	400-800	1-45
SP	99.98	100-300	1-25
EL-Grade	99.99	50-150	1-10

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

Industria	Aplicación
Aeroespacial	Blindaje contra las radiaciones, contrapesos
Automoción	Vibration damping in vehicles
Electrónica	Heat sinks, contacts, electrodes
Militar	Kinetic energy penetrators, ordnance
Fabricación	Cutting tools, dies, tooling
Petróleo y gas	High 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

Empresa	Ubicación
HC Starck	Germany, USA
Tungsteno Buffalo	EE.UU.
Tungsteno del Medio Oeste	EE.UU.
Plansee	Austria
Zhuzhou Cemented Carbide	China

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

Grado	Precio 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

Parámetro	Tungsteno	Molibdeno	Tántalo
Densidad (g/cc)	19.3	10.3	16.6
Melting point (°C)	3422	2617	2996
Conductividad térmica (W/mK)	173	138	57
Electrical resistivity (μΩ-cm)	5.6	5.7	13
Precio por kg	$100-$500	$30-$100	$250-$500

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

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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