순수 텅스텐 분말 소개

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.

순수 텅스텐 분말 소개

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
• 고온 강도
• 뛰어난 열 전도성
• 낮은 열팽창 계수
• 우수한 내식성 및 내산화성

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.

종류 순수 텅스텐 분말

Various grades of pure tungsten powder:

Types of Pure Tungsten Powder

유형	순도	입자 크기	형태학
Pure	99.9% W	1-150 μm	불규칙하고 각진
초미세먼지	99.9% W	<10 μm	구형
나노 파우더	>99.9% W	<100nm	구형
고순도	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

속성	가치
밀도	19.3g/cc
녹는점	3422°C
열 전도성	173 W/mK
전기 저항	5.6 μΩ-cm
인장 강도	550-620 MPa
탄성 계수	400 GPa
열팽창 계수	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

매개변수	세부 정보	중요성
입자 크기	1-150 μm	Smaller sizes improve sintering
파티클 모양	Varied – angular, spherical	Impacts density and flow
겉보기 밀도	3-4g/cc	Indicates compaction properties
탭 밀도	9-11 g/cc	높은 포장 밀도
유량	20-25 s/50g	Measure of powder flowability
산소 함량	<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

매개변수	값	표준
Tungsten content	>99.9%	ASTM B763
입자 크기	1~10μm	ASTM B213
겉보기 밀도	>3 g/cc	ASTM B212
탭 밀도	>9 g/cc	MPIF 04
유량	<25 s/50g	ASTM B213
산소 함량	<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

크기	설명	일반적인 용도
1~10μm	Ultrafine grade	적층 제조
10-25 μm	고급 등급	Powder injection molding
25-45 μm	중간 등급	절단 도구
45-150 μm	거친 등급	텅스텐 중합금

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

등급 순수 텅스텐 분말

Grades of Pure Tungsten Powder

등급	Purity (%W)	산소(ppm)	입자 크기(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

산업	애플리케이션
항공우주	방사선 차폐, 카운터웨이트
자동차	Vibration damping in vehicles
전자 제품	Heat sinks, contacts, electrodes
군대	Kinetic energy penetrators, ordnance
제조	Cutting tools, dies, tooling
석유 및 가스	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

회사	위치
HC 스탁	Germany, USA
버팔로 텅스텐	미국
중서부 텅스텐	미국
Plansee	오스트리아
Zhuzhou Cemented Carbide	중국

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

등급	kg당 가격
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

매개변수	텅스텐	몰리브덴	탄탈륨
밀도(g/cc)	19.3	10.3	16.6
Melting point (°C)	3422	2617	2996
Thermal conductivity (W/mK)	173	138	57
Electrical resistivity (μΩ-cm)	5.6	5.7	13
kg당 가격	$100-$500	$30-$100	$250-$500

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

자주 묻는 질문

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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