Preparation method of spherical iron-based powder

A powder and spherical technology, applied in the field of the preparation of spherical ferrite-based powder, can solve the problems such as the inability to effectively control the amount of intermetallic compounds, reduce the high-temperature mechanical properties of materials, and reduce intermetallic compounds, and achieve controllable product composition, The effect of strong designability and simple process

Active Publication Date: 2019-07-16
UNIV OF SCI & TECH BEIJING +1
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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 tim

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  • Preparation method of spherical iron-based powder
  • Preparation method of spherical iron-based powder
  • Preparation method of spherical iron-based powder

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preparation example Construction

[0027] Such as figure 1 Shown, a kind of preparation method of spherical ferrite base powder of the present invention, described method comprises the following steps,

[0028] Configuration of S1 precursor slurry: dissolve the nano-oxide source in an appropriate amount of solvent to obtain a transparent solution, add the aerosolized powder into the transparent solution and soak it completely, and use a mixer to mix 0.5 at a speed of 20-60 rpm -4 hours to obtain a homogeneously mixed precursor slurry;

[0029] S2 Preparation of intermetallic compound and nano-oxide co-reinforced spherical ferrite-based powder products: the obtained precursor slurry is prepared by radio frequency plasma spheroidization technology to obtain spherical ferrite-based powder, the spherical ferrite-based powder The average particle size of the oxide dispersed phase in the middle is ≤15nm.

[0030] According to an embodiment of the present disclosure, the solvent in S1 is alcohol.

[0031] According...

Embodiment 1

[0041] Fe-8wt.%Cr-5wt.%Ni-1wt.%Al-2wt.%Mn-1wt.%Ti-2wt.%Mo-1wt.%Al 2 o 3 Preparation of spherical ferrite-based powders co-reinforced by intermetallic compounds and nano-oxides

[0042] The atomized powder and aluminum nitrate (Al(NO 3 ) 3 9H 2 O) Weigh it with a mass ratio of 13.464:1 for later use.

[0043] Dissolve the weighed aluminum nitrate in an appropriate amount of alcohol, and stir in a container to form a transparent solution. Add atomized powder and appropriate amount of alcohol into the solution evenly until the alloy powder is just wetted by alcohol. Next, a mixer was used to mix for 2 hours at a speed of 40 rpm to obtain a precursor slurry.

[0044] During the radio frequency plasma spheroidization process, the negative pressure is 7500Pa; the middle gas is argon, and the flow rate of the middle gas is 25L / min; the shell gas is argon, and the flow rate of the shell gas is 70L / min; The gas sprays the precursor solution into the plasma arc through the feedin...

Embodiment 2

[0046] Fe-12wt.%Cr-6wt.%Ni-1.5wt.%Al-3wt.%Mn-1.5wt.%Ti-2wt.%Mo-0.6wt.%Y 2 o 3 Preparation of spherical ferrite-based powders co-reinforced by intermetallic compounds and nano-oxides

[0047] The atomized powder and yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O) Weigh it with a mass ratio of 48.878:1 for later use.

[0048] First, dissolve the weighed yttrium nitrate in an appropriate amount of alcohol, and stir in a container to form a transparent solution. Add atomized powder and appropriate amount of alcohol into the solution evenly until the alloy powder is just wetted by alcohol. Next, a mixer was used to mix for 4 hours at a speed of 30 rpm to obtain a precursor slurry. During the radio frequency plasma spheroidization process, the negative pressure is 7800Pa; the middle gas is argon, and the flow rate of the middle gas is 20L / min; the shell gas is argon, and the flow rate of the shell gas is 75L / min; the carrier gas is 6L / min The gas sprays the precursor solution into the p...

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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...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/14C22C38/06C22C38/04C22C38/58C22C38/50C22C38/44B22F3/22B33Y70/00
CPCB22F9/14C22C38/06C22C38/04C22C38/58C22C38/50C22C38/44C22C32/0026B22F3/225B33Y70/00B22F1/065
Inventor 章林陈晓玮刘烨陈旭王胜玺秦明礼曲选辉
Owner UNIV OF SCI & TECH BEIJING
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