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A kind of nanoporous metal powder and preparation method thereof

A nanoporous, metal powder technology, applied in metal processing equipment, nanotechnology, nanotechnology, etc., can solve problems such as difficult to precisely control the shape, and achieve the effects of low cost, large specific surface area, and high thermal conductivity

Active Publication Date: 2020-12-29
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nanoporous powder particles obtained by these methods generally have arbitrary shapes, and it is difficult to precisely control their morphology

Method used

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  • A kind of nanoporous metal powder and preparation method thereof
  • A kind of nanoporous metal powder and preparation method thereof
  • A kind of nanoporous metal powder and preparation method thereof

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preparation example Construction

[0027] The preparation method of the nanoporous metal powder provided by the invention comprises:

[0028] S1, by molecular formula Mg a Cu b m c RE d Weigh raw materials, wherein, M is selected from at least one of Au, Pt, Pd, Ru, Rh, and Ir, RE is at least one of rare earth elements, and a, b, c, and d represent the atomic hundred of each element respectively. content, and 55%≤a≤70%, 15%≤b≤25%, 2%≤c≤10%, a+b+c+d=100%, the raw material is melted and then solidified in the first rate cooling to room temperature to obtain the first alloy, wherein the solidified structure of the first alloy includes a M-rich primary crystal phase and a first matrix phase, and the primary crystal phase includes at least one of M and Cu, RE, The shape of the primary crystal phase is a sheet-like hexagon, and the melting point of the primary crystal phase is T m , the melting point of the first matrix phase is T n ,T n m ;

[0029] S2, heating the first alloy to a temperature T, and then co...

Embodiment 1

[0047] Select the ingredient as Mg 61 Cu 23 Au 5 Gd 11 According to the composition of the elements, the alloy is prepared according to the composition of the elements, and the alloy is fully induction melted, and then the alloy melt is solidified to room temperature at a rate of 50K / s, and the composition is Mg 61 Cu 23 Au 5 Gd 11 the first alloy. During the solidification process, the Au-rich primary crystal phase with the elemental composition of Au-Cu-Gd is first precipitated, and the remaining melt with the ability to form amorphous solidifies to become the first matrix phase. The melting point of the primary crystal phase is 520 ° C, the first The melting point of the matrix phase is 475°C.

[0048] The first alloy is reheated to 500° C. to melt the first matrix phase, while the Au-rich Au-Cu-Gd primary crystal phase does not melt, and a semi-solid alloy melt is obtained. The semi-solid alloy melt is passed through the copper roll stripping technique in ~10 6 Af...

Embodiment 2

[0051] Select the ingredient as Mg 61 Cu 20 Au 5 Pt 2 PD 1 Gd 11 According to the composition of the elements, the alloy is prepared according to the composition of the elements, and the alloy is fully induction melted, and then the alloy melt is solidified to room temperature at a rate of 10K / s, and the composition is Mg 61 Cu 20 Au 5 Pt 2 PD 1 Gd 11 the first alloy. During the solidification process, the Au-Pt-Pd-rich primary crystal phase with the elemental composition (Au-Pt-Pd)-Cu-Gd is first precipitated, while the remaining melt with amorphous forming ability solidifies as the first matrix phase, The primary crystal phase has a melting point of 525°C and the first matrix phase has a melting point of 480°C.

[0052] The first alloy was reheated to 510°C so that the first matrix phase melted, while the Au-Pt-Pd-rich primary phase with the elemental composition (Au-Pt-Pd)-Cu-Gd did not melt, resulting in a semi-solid state alloy melt. The semi-solid alloy melt...

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Abstract

The invention relates to a nanoporous metal powder and a preparation method thereof. The preparation method first selects specific components to be melted into a melt, and controls the first solidification rate so that the first alloy obtained by solidification has a hexagonal shape. primary crystal phase and first matrix phase. In order to facilitate the separation of the primary crystal phase, the first alloy is reheated and the first matrix phase is re-melted and solidified into an amorphous second matrix phase by controlling the heating temperature and the second solidification rate to obtain the second alloy. Finally, a dealloying method is adopted to prepare the nano-porous metal powder with flake-like hexagonal particles, and the nano-porous metal powder has a nano-porous structure. The preparation method of the present invention is simple in process, and the obtained nanoporous metal powder has a large specific surface area, and also has excellent properties such as good particle fluidity, high thermal conductivity, high electrical conductivity and corrosion resistance, making it suitable for use in catalysis, new energy, photoelectricity, etc. and other fields have important applications.

Description

[0001] related application [0002] This application claims the priority of the Chinese patent application filed on March 12, 2020 with the application number 202010170802.2 and titled "Metallic Materials and Preparation Method Thereof", which is hereby incorporated by reference in its entirety. technical field [0003] The invention relates to the technical field of nanoporous metal powder, in particular to nanoporous metal powder and a preparation method thereof. Background technique [0004] At present, the preparation method of nanoporous metal powder is mainly dealloying method. The method prepares nanoporous metal powder by corroding the relatively active elements in the alloy, and then constructing a three-dimensional porous structure through the diffusion and rearrangement of the remaining inert elements. In general, the dealloying method is suitable for the preparation of large-sized bulk or strip nanoporous materials; or the further preparation of nanoporous powde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C3/00C22C1/02C22C23/00B82Y30/00B82Y40/00
CPCC22C3/005C22C1/02C22C23/00B82Y30/00B82Y40/00B22F1/0551B22F1/07B22F1/054
Inventor 赵远云常春涛赵成亮
Owner DONGGUAN UNIV OF TECH
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