Fournisseur de Tungstène et Alliages

Pure tungsten is a hard metal with a color ranging from steel gray to tin white. When very pure, it can be cut with a hacksaw, but when impure, it is brittle and difficult to work with. Typically, it is processed through forging, extrusion, or drawing. This element has the highest melting point (3,422°C) of all metals and the greatest tensile strength of all metals at temperatures above 1650°C, with a Young's modulus of 406 GPa. Due to its very high melting temperature, tungsten is not melted but sintered. It has excellent corrosion resistance and can only be slightly attacked by mineral acids.

Tungsten has a wide range of applications. The hardness and density of this metal make it ideal for creating metal alloys used in armaments, heat sinks, as well as weights and counterweights.
Since its coefficient of expansion is equivalent to that of borosilicate glass, it is used to make glass-to-metal welds (electrodes, electrical feedthroughs).

Superalloys containing tungsten are used to make turbine blades, steel tools and plating.

It is used as a refractory electrode in TIG welding.
The arc contacts of high-voltage circuit breakers are also partially made of tungsten in order to withstand the high temperature of an electric arc.

Tungsten is used in the mining, petroleum and armaments industries and in the electrical industry in pure or alloyed form.

Tungsten-rhenium alloy is an alloy strengthened by a solid solution composed of a tungsten element as a matrix and a rhenium element. The rhenium contents commonly used in alloys are 3, 5, 10, 25 and 26. It is divided into low-grade W-Re alloy (Re≤5%) and high-grade W-Re alloy (Re≥15%).
Tungsten-rhenium alloy has better mechanical properties and ductility than pure tungsten, and has a high resistivity, making it more processable and weldable.
The tungsten-rhenium alloy possesses a series of excellent properties, such as a high melting point, high resistance, high hardness, high plasticity, high recrystallisation temperature, high resistivity, high thermoelectric potential value, low vapour pressure, low electron work function and a low ductility and brittleness transition temperature. Tungsten-rhenium comes in wire, rod, plate, and sheet forms. Wire materials account for the vast majority and are mainly used as high-temperature structural materials.

Tungsten-rhenium alloy is a composite of two transition metals: tungsten (W) and rhenium (Re). This combination creates a material with unique properties, used in demanding environments. A typical chemical composition for this alloy is:

• Tungsten (W): Approximately 95% to 99% by weight
• Rhenium (Re): Approximately 1% to 5% by weight

Main characteristics of W-Re alloy :

Heat resistance : Alloy W-Re offers exceptional resistance to high temperatures, making it suitable for applications subject to extreme thermal conditions, such as gas turbine components and heat shields in the aerospace industry.

• Corrosion resistance : Thanks to the presence of rhenium, known for its resistance to corrosion, W-Re alloy provides increased protection against corrosive environments, extending service life and reliability.


Applications for alloy W-Re :

• Aerospace industry Components for rocket engines, rocket nozzles, structural parts.
• Semiconductor industry : Components for substrate supports, electrical contacts.
• Chemical industry Chemical reactor equipment, corrosion-resistant parts.

Tungsten-copper alloy contains 6-50% copper and presents the advantages of both tungsten and copper: high temperature resistance, resistance to arc ablation, high strength, high density, good electrical and thermal conductivity, low thermal expansion, easy to cut and process, has transpiration cooling properties, and is widely used in machinery, electricity generation, electronics, metallurgy, aerospace, and other industries.

Main characteristics of W-Re alloy :

• High density : Thanks to the high density of tungsten, W-Cu alloy has a high density, making it ideal for applications requiring a large mass in a small volume.
• Good thermal and electrical conductivity : Copper gives alloy W-Cu excellent thermal and electrical conductivity, making it ideal for applications where heat dissipation or electrical conductivity is important.
• Mechanical strenght : The addition of tungsten to the alloy improves its mechanical strength, making it a robust material for a variety of industrial applications.

W-Cu alloy applications :

• Resistance welding electrodes Due to its wear resistance and high electrical conductivity, alloy W-Cu is widely used in the manufacture of resistance welding electrodes.
• Electronic components : Tungsten-copper composites are used in the manufacture of heat sinks, electronic enclosures, and other components requiring excellent thermal and electrical conductivity.
• Industry and defence industry : W-Cu alloy is used in the manufacture of parts for aircraft, missiles, and satellites, where mechanical strength and thermal conductivity are critical factors.

Tungsten-lanthanum alloy is made up of different proportions of tungsten (W) and lanthanum (La), depending on the specific needs of each application. A typical chemical composition for this alloy is:

• Tungsten (W): Approximately 95% to 99%
• Lanthanum (La): Approximately 1% to 3%.

Main characteristics of W-Re alloy :
• High density : Since tungsten is a heavy metal, W-La alloy has a high density, making it ideal for applications requiring this property.
Heat resistance : Tungsten-Lanthanum retains the heat resistance of pure tungsten, making it suitable for high-temperature environments.
• Improved ductility : The addition of lanthanum can improve the ductility of tungsten, making it easier to machine and form.

W-La alloy applications:
• Welding electrodes W-La alloy is widely used in the manufacture of TIG (Tungsten Inert Gas) and plasma welding electrodes for its heat resistance and high thermal conductivity.
• Components for the lighting industry: Tungsten-lanthanum filaments are used in incandescent lamps for their ability to withstand high temperatures and produce a bright, stable light
• Aerospace and nuclear applications : En raison de sa résistance à la chaleur et à la corrosion, l'alliage W-La est utilisé dans la fabrication de composants pour les moteurs de fusée, les réacteurs nucléaires et d'autres applications exigeantes.

Why choose W-La alloy?

Tungsten-lanthanum alloy offers a unique combination of high density, heat resistance, and improved ductility, making it the preferred choice for many industrial applications.