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Tungsten powder description

Powdered metallic tungsten powder serves as the raw material for the production of processed tungsten products, tungsten alloy, and tungsten material. Tungsten powder is industrially manufactured mainly through hydrogen reduction of tungsten trioxide or ammonium metatungstate. For special uses with ultrafine particle size and high purity, the development of the tungsten chloride hydrogen reduction process has resulted in tungsten powder with particle sizes below 0.05μm. SAM offers nano-tungsten with particle sizes ranging from 40–80nm and from 30nm to 1µm.

The properties of tungsten powder directly affect the production of tungsten materials and the quality of tungsten powder metallurgy products, and purity and particle size have particularly significant effects.

Tungsten Powder Specification

Specification	Grade	APS/BET/FSSS	Oxygen (%,≯)
Ultra-Fine Size	ZE03	3.1-5.2m2/g	0.60
	ZE04	2.0-3.5m2/g	0.55
	ZE06	0.50-0.70μm	0.40
	ZE07	0.60-0.80μm	0.35
	ZE08	0.70-0.90μm	0.25
Fine Size	ZW10	0.90-1.10μm	0.20
	ZW12	1.10-1.30μm	0.15
	ZW15	1.30-1.70μm	0.12
Medium Size	ZW20	1.80-2.20μm	0.08
	ZW25	2.30-2.70μm	0.08
	ZW30	2.80-3.20μm	0.06
	ZW35	3.30-3.70μm	0.06
	ZW40	3.80-4.50μm	0.04
	ZW50	4.50-5.50μm	0.04
	ZW60	5.50-6.50μm	0.04
	ZW70	6.50-7.50μm	0.04
Coarse Size	ZW80	7.50-8.50μm	0.04
	ZW90	8.50-9.50μm	0.04
	ZW100	9.00-11.0μm	0.04
	ZW120	11.0-13.0μm	0.03
Ultra-Coarse Size	ZW150	13.0-17.0μm	0.03
	ZW200	16.0-25.0μm	0.03
	ZW300	25.0-35.0μm	0.03
	ZW400	35.0-45.0μm	0.03

Main Products

Type	Purity	Shape	Particle Size
Spherical W Powder	≥99.95%	Spherical	50nm, 100nm, 1-10um, 5-25um, 15-45um
W Powder	≥99.95%	Non-spherical	0.5-45.0 μm or customized
Nano Tungsten Powder	>99.9%	Spherical	40-80nm; 30nm-1um (customized)
Tungsten Rhenium Alloy Powder	99.90%	Non-spherical	15-53μm, 45-105μm, or customized
Tungsten Molybdenum Alloy Powder	≥99.9%	Spherical	5-25μm, 15-45μm, 15-53μm, 45-75μm, 45-105μm, 75-150μm
Nickel-coated Tungsten	≥99.9%	Spherical	5-25μm, 15-45μm, 15-53μm, 45-75μm, 45-105μm, 75-150μm
Copper-coated Tungsten	99.90%	Spherical	5-25μm, 15-45μm, 15-53μm, 45-75μm, 45-105μm, 75-150μm
Tungsten Carbide Powder	≥99.8%	Spherical	0-25,15-53,45-105,75-150μm
Tungsten Carbide Cobalt Chromium	99.90%	Non-Spherical	1-60μm, or customized
WC-Co6 Powder	99.90%	Spherical	0.85-0.005mm, or as request
WC-Co12 Powder	99.90%	Spherical	0.85-0.005mm, or as request
WC-5Co	99.90%	Non-Spherical	5-30, 15-45, 45-105 μm, or customized
WC-8Co	99.90%	Non-Spherical	5-30, 15-45, 45-105 μm, or customized
WC-10Co	99.90%	Non-Spherical	5-30, 15-45, 45-105 μm, or customized
WC-15Co	99.90%	Non-Spherical	5-30, 15-45, 45-105 μm, or customized

Tungsten powder exhibits a variety of particle sizes and morphologies, commonly including spherical, needle-like, and irregular shapes. Different particle sizes and morphologies influence their flowability, compressibility, and sintering performance in various processes.

Tungsten powder application

Tungsten powder is the primary feedstock for powder metallurgy tungsten products and tungsten alloys processing. Pure W powder can be processed into wire, rod, tube, sheet, and other processed materials and formed products. If combined with other metal powders, tungsten powder can be used to manufacture various tungsten alloys such as tungsten-molybdenum alloy, tungsten-rhenium alloy, tungsten-copper alloy, high-density tungsten alloy, etc. Another important application of tungsten powder is used to produce tungsten carbide powder, which further finds applications to produce hard alloy tools, such as lathe tools, milling cutters, drill bits, and molds.

Tungsten alloys with chromium, molybdenum, and cobalt that are heat and wear resistant are used to produce cutting tools, metal surface hardening materials, gas turbine blades, and combustion pipes.
Tungsten is alloyed with tantalum, niobium, and molybdenum to produce refractory alloys.
Tungsten-silver and tungsten-copper alloys are used as contact materials.
Tungsten-nickel-copper dense alloys are utilized for radiation shielding.

Tungsten powder can be sintered into various porous filters.

FAQs

1. What are the primary uses of tungsten powder?

It is utilized in the production of processed tungsten materials, alloys, and various products, including electronics, aerospace components, and industrial machinery.

2. What are the differences between tungsten and tantalum?

Tungsten has a higher melting point (3422°C vs. 3017°C) and density (19.3 vs. 16.6 g/cm³) than that of tantalum. Tantalum is extremely resistant to corrosion, with resistance to acids, alkalis, and even aqua regia, and is thus extremely well-suited for chemical and medical applications. Tungsten, while extremely heat-resistant, oxidizes at elevated temperatures and finds its primary uses in ultra-high-temperature applications like rocket nozzles and armour-piercing shells.

3. What are the differences between tungsten and molybdenum?

The melting point of tungsten (3422°C versus 2623°C) is much greater, and it is denser (19.3 versus 10.2 g/cm³) than molybdenum. Molybdenum is easier to process and cheaper and employed extensively in high-temperature furnace and electronic system applications. Tungsten, with its excellent heat resistance and hardness, is employed where there are actually very high temperatures in rocket motors and nuclear applications.

4. What role does tungsten powder play in high-temperature applications?

In high-temperature applications, tungsten powder is used to manufacture components that must withstand extreme heat, such as furnace parts, nozzles, and heat shields.

5. Is tungsten powder easily oxidized?

Yes, it can be easily oxidized at high temperatures or in oxygen-rich environments. Therefore, anti-oxidation measures should be taken when storing and using the material.