Preparation method of spherical iron-based powder

Abstract

The invention belongs to the field of study on preparation of spherical metal-based powder, and particularly provides a preparation method of intermetallic compound and nano oxide co-reinforced spherical ferrite-based powder. The preparation method comprises the steps that precursor slurry is prepared; and the intermetallic compound and nano oxide co-reinforced spherical ferrite-based powder is prepared, and specifically, radio-frequency plasma spheroidization is conducted on the obtained precursor slurry, the precursor slurry is delivered into an anatomization nozzle through a carrier gas, isatomized, and then reaches a high-temperature region for radio-frequency plasma heating, nitrate is decomposed first to obtain corresponding oxide nano particles, and then atomized powder and the oxide nano particles are heated by radio-frequency plasma to be molten and finally turn into the spherical ferrite-based powder under the effect of surface tension. The preparation method provides a novel idea for preparation of the intermetallic compound and nano oxide co-reinforced spherical ferrite-based powder and has the advantage of short production cycle, low cost, convenient operation, and the like.

Description

technical field [0001] The invention belongs to the research field of preparation of spherical metal-based powders, and particularly provides a preparation method of spherical ferrite-based powders. Background technique [0002] Ferritic alloys co-strengthened by intermetallic compounds and nano-oxides have a γ / γ' coherent two-phase structure similar to nickel-based alloys, which is expected to improve the service temperature limit and high-temperature mechanical properties of traditional ferritic alloys. It has important application prospects in the field of high-temperature structural materials. [0003] Generally, such ferrite-based alloys are mainly composed of Fe, Cr, Ni, Al, Mn, Ti, and Mo elements, and Fe is the main constituent element of alloy matrix ferrite. The addition of an appropriate amount of Cr helps to improve the corrosion resistance of the alloy, and the solid solution of Cr in the matrix can achieve solid solution strengthening. Ni and Al are mainly th...

AI Technical Summary

Problems solved by technology

When the mechanical alloying process prepares the oxide dispersion strengthened ferrite-based alloy strengthened by intermetallic compounds and oxides, Al, Ti, Mn and other elements are easily oxidized during the mechanical alloying process, so that they participate in the formation of NiAl and Ni 2 The reduction of AlTi intermetallic compounds cannot achieve the purpose of effectively controlling the amount of intermetallic compounds

At the same time, the inclusions that are easily introduced by long-term ball milling will reduce the high-temperature mechanical properties of the material

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 ferritic alloys strengthened by intermetallic compounds and nano-oxides

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