Preparation method of spherical ferrite base oxides dispersion strengthening (ODS) alloy powder

Abstract

The invention belongs to the field of preparation research of spherical metal base powder, and provides a preparation method of spherical ferrite base oxides dispersion strengthening (ODS) alloy powder. The preparation method comprises the specific steps of dissolving a nanometer oxide source in a solvent, and performing stirring, so as to obtain a clear solution; adding gas atomization powder tothe clear solution, and performing mixing with a material mixer under the rotational speed of 20-60 revolutions per minute for 0.5-4 hours, so as to obtain a precursor pulp; performing radio frequencyplasma spheroidization on the obtained precursor pulp; transporting the precursor pulp to an atomizing nozzle with carrier gas, performing atomizing, enabling the atomized precursor pulp to reach a high-temperature zone heated by radio frequency plasma, and enabling nitrate to firstly decompose to obtain corresponding oxide nanometer particles; and then enabling the atomized powder and the oxidenanometer particles to be heated by the radio frequency plasma to melt, then enabling the melted atomized powder and the melted oxide nanometer particles to be converted into spheres under the effectof surface tension, and performing cooling, so as to obtain the spherical ODS ferrite base powder. The preparation method disclosed by the invention provides a new thought for preparing spherical ODSferrite base powder, and has the advantages of being short in production cycle, low in cost, easy to operate and the like.

Description

technical field [0001] The invention belongs to the field of preparation and research of spherical metal-based powders, and in particular provides a method for preparing spherical ferrite-based ODS alloy powders. Background technique [0002] Oxide Dispersion Strengthening (ODS) ferritic alloys have good mechanical properties, high temperature mechanical properties, creep resistance and radiation resistance, and have important applications in the automotive industry, aerospace and nuclear industries. prospect. [0003] ODS ferrite is mainly dispersion strengthened by very fine nano oxide particles (clusters). Since nano-oxide particles generally have high thermal stability and will not dissolve in the matrix at high temperatures, they have the potential to further increase the service temperature of the alloy. At the same time, the high volume fraction of nano-oxide particles can effectively improve its ability to resist radiation damage and radiation swelling. Therefore,...

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, metal elements such as Fe and Cr are easily oxidized during the mechanical alloying process, which increases the oxygen content of the alloy and reduces its performance.

At the same time, long-term ball milling is easy to introduce inclusions of ball milling medium materials, which will reduce the high temperature mechanical properties of materials

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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