Method for preparing spherical nickel-based powder

Abstract

The invention belongs to the field of spherical metal-based powder preparation and research, and particularly provides a method for preparing spherical nickel-based powder. The method comprises the steps that S1, a nanometer oxide source is dissolved into a moderate amount of solvent and stirred to obtain a transparent solution, and nickel-based alloy gas atomized powder is added into the transparent solution, and precursor slurry is obtained; S2, the obtained precursor slurry is subjected to radio frequency plasma spheroidization, the precursor slurry is conveyed to an atomized nozzle throughcarrier gas, after atomizing, the slurry reaches the radio frequency plasma heating high-temperature area, the nanometer oxide source is firstly decomposed, and has a reaction, corresponding oxide nanoparticles are obtained, the atomized powder and the oxide nanoparticles are heated and molten through radio frequency plasmas, under the effect of the surface tension, a sphere is achieved, and through cooling, spherical metal-based powder is obtained. The new thinking is provided for preparing the spherical metal-based powder, and the advantages of being short in production period, low in cost,convenient to operate and the like are achieved.

Description

technical field [0001] The invention belongs to the research field of preparation of spherical metal-based powders, and in particular provides a preparation method of spherical nickel-based powders. Background technique [0002] Nickel-based alloys with nanoscale oxides for dispersion strengthening (Oxides Dispersion strengthening, ODS) are high-temperature structural materials with a wide range of application backgrounds. Different from traditional nickel-based superalloys, nano-oxide dispersion strengthened nickel-based alloys mainly use nano-oxides for dispersion strengthening. Compared with the γ' phase in traditional nickel-based superalloys, nano-oxides have higher thermal stability and will not dissolve even when heated to a temperature close to the melting point of the alloy, so they still have excellent high-temperature creep properties and fatigue resistance above 1000 °C. properties and antioxidant properties. [0003] Blades in advanced gas turbines with comple...

AI Technical Summary

Problems solved by technology

When preparing nano-oxide dispersion-strengthened nickel-based alloys by mechanical alloying process, elements such as Al, Ti, and Cr are easily oxidized during the mechanical alloying process, which reduces the properties of the final alloy.

At the same time, during the ball milling process, the powder, the milling medium and the ball milling tank will collide at high speed, and the long-term ball milling will cause the elements in the ball milling medium and the ball milling tank to be introduced into the target powder to cause pollution, which will affect the final material properties

Finally, most of the powders obtained by mechanical alloying are irregular powders with poor powder fluidity

This makes it impossible to achieve near-net shape by 3D printing or powder injection molding.

This severely limits the application of nano-oxide dispersion strengthened nickel-based alloys

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