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What is Spherical tungsten powder

What is Spherical tungsten powder

(Summary description)As a representative of refractory metals, tungsten (W) and rhenium (Re) can be combined into Spherical tungsten powder. More specifically, a proper amount of rhenium can be dissolved in tungsten to form a solid solution alloy powder.

What is Spherical tungsten powder

(Summary description)As a representative of refractory metals, tungsten (W) and rhenium (Re) can be combined into Spherical tungsten powder. More specifically, a proper amount of rhenium can be dissolved in tungsten to form a solid solution alloy powder.

Information

As a representative of refractory metals, tungsten (W) and rhenium (Re) can be combined into Spherical tungsten powder. More specifically, a proper amount of rhenium can be dissolved in tungsten to form a solid solution alloy powder. According to different appearance shapes, Spherical tungsten powder can be divided into spherical tungsten-rhenium alloy powder and irregular tungsten-rhenium alloy powder. It is worth mentioning that with the continuous maturity of science and technology, the market demand for the former has gradually increased.

Spherical tungsten powder

Spherical tungsten powder is an alloy powder composed of metal tungsten as the matrix and adding rhenium with different contents. Generally speaking, the content of W is between 73.9% and 99.8%, the content of Re is between 0.1% and 26%, and the impurity elements are O, Fe, Ni, Cr, Cu, Si, Al, Mg, Mn, Sn, Sb, Pb, Ca, Cd, Co, As, Bi, Ti, V, Zn, Mo, K, Na, C, N, S, P, etc.

In terms of physical and chemical properties, the average particle size of Spherical tungsten powder is between 2.0-4.0um, with high melting point, high recrystallization temperature, high thermoelectric potential, high resistivity, corrosion resistance, good plasticity, excellent high temperature creep resistance, weldability and Features such as machining. Within a certain range, as the content of rhenium increases, the overall performance of the alloy is better.

In terms of production process, the steps to prepare spherical Spherical tungsten powder include: 1) Ingredients: take a certain amount of ammonium paratungstate and ammonium rhenate; 2) Mixing: prepare ammonium paratungstate and ammonium rhenate into a solution, and dry and crystallize; 3) reduction: In a hydrogen environment, the mixed crystal is reduced to tungsten-rhenium alloy powder; 4) Molding: Put the W-Re alloy powder into the mold and form by cold isostatic pressing; 5) Sintering: The step 4) is sintered in a hydrogen atmosphere. The product is heated, insulated, and sintered to obtain tungsten-rhenium alloy rod blanks; 6) processing: the rod blanks need to undergo processing such as rotary forging, straightening and peeling; 7) spherical tungsten-rhenium alloy powder can be obtained by plasma rotary atomization.

Spherical tungsten powder is used as an electrode or filament in many cases. It can replace pure tungsten, tungsten lanthanum, tungsten cerium, doped tungsten and other tungsten materials as electrodes or filaments; second, it can be used as high-temperature parts, such as spacecraft nozzles and nozzles. , Heat shield of vacuum furnace, etc.
 

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