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A kind of preparation method of spherical ferrite base powder

A ferrite and powder technology, which is applied in the field of preparation of spherical ferrite-based powder, can solve the problems of inability to effectively control the amount of intermetallic compounds, poor powder fluidity, and lower high-temperature mechanical properties of materials

Active Publication Date: 2020-10-23
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 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

Method used

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  • A kind of preparation method of spherical ferrite base powder
  • A kind of preparation method of spherical ferrite base 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 with 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 fee...

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 with 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 th...

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Abstract

The invention belongs to the research field of preparation of spherical metal-based powders, and in particular provides a method for preparing spherical ferrite-based powders co-strengthened by intermetallic compounds and nano-oxides. The method includes: preparing a precursor slurry; preparation of intermetallic compound and nano-oxide co-reinforced spherical ferrite-based powder products: performing radio frequency plasma spheroidization on the obtained precursor slurry, and making the obtained precursor slurry Carry out radio frequency plasma spheroidization, the precursor slurry is transported to the atomizing nozzle by the carrier gas, and after being atomized, it reaches the high temperature zone heated by radio frequency plasma, where the nitrate first decomposes to obtain the corresponding oxide nanoparticles, and then atomizes the powder and oxide The nanoparticles are heated and melted by radio frequency plasma, and then become spherical ferrite-based powder under the action of surface tension. The invention provides a new idea for preparing intermetallic compound and nano-oxide co-reinforced spherical ferrite-based powder, and has the advantages 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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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/14C22C38/06C22C38/04C22C38/58C22C38/50C22C38/44B22F3/22B33Y70/10
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