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A method of laser cladding and chemical dealloying combined to prepare micro-nano structured bulk silicon materials

A technology of chemical dealloying and micro-nano structure, which is applied in the field of laser cladding technology combined with chemical dealloying technology to prepare micro-nano structure bulk silicon materials, can solve the problems of difficult control of micro-nano silicon material structure and high reaction conditions, and achieve organizational The effect of small size, simple preparation method and simple condition requirements

Active Publication Date: 2018-12-18
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(4) Magnesium thermal reduction method, this method is to use metal magnesium to reduce silicon dioxide to silicon under high temperature conditions. The structure of micro-nano silicon materials prepared by this method is not easy to control, and the reaction conditions are high. down to proceed
However, using aluminum-silicon powder as raw material, using laser cladding technology to prepare precursor alloys, and then using chemical dealloying to remove aluminum elements to prepare micro-nano structured bulk silicon materials, has not been involved so far.

Method used

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  • A method of laser cladding and chemical dealloying combined to prepare micro-nano structured bulk silicon materials
  • A method of laser cladding and chemical dealloying combined to prepare micro-nano structured bulk silicon materials
  • A method of laser cladding and chemical dealloying combined to prepare micro-nano structured bulk silicon materials

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Raw materials:

[0026] (1) Aluminum-silicon powder (-325 mesh, 99%), Al:Si=95:5wt.%, particle size about 80 μm.

[0027] (2) Aluminum plate, purity: 99.0%, size: 100mm×50mm×5mm.

[0028] (3) Etching solution: 3mol / L HCL solution.

[0029] 2. Preparation method

[0030] Step 1. Preparation of precursor alloy material:

[0031] Put the aluminum-silicon powder on the base material aluminum plate (100mm×50mm×5mm), the preset thickness is about 1mm, use YLS-6000 fiber laser for cladding, laser power: 5kW, spot diameter: 5mm, scanning speed: 4mm / s, argon shielding gas flow rate: 15L / min. Then wire cutting is used to separate the cladding layer from the substrate to obtain a precursor alloy material.

[0032] Step 2, chemical dealloying treatment:

[0033] The precursor alloy material prepared by cladding was immersed in 3mol / L HCL solution and corroded for 2 hours until the reaction stopped, and then the micro-nano structure intermediate obtained after corrosion wa...

Embodiment 2

[0035] 1. Raw materials:

[0036] (1) Aluminum-silicon powder (-325 mesh, 99%), Al:Si=88:12wt.%, particle size about 80 μm.

[0037] (2) Aluminum plate, purity: 99.0%, size: 100mm×50mm×5mm.

[0038] (3) Etching solution: 3mol / L HCL solution.

[0039] 2. Preparation method

[0040] Step 1: Preparation of precursor alloy material:

[0041] Put the aluminum-silicon powder on the base material aluminum plate (100mm×50mm×5mm), the preset thickness is about 2mm, use YLS-6000 fiber laser for cladding, laser power: 5.5kW, spot diameter: 5mm, scanning speed: 8mm / s, argon protective gas flow: 15L / min. Then wire cutting is used to separate the cladding layer from the substrate to obtain a precursor alloy material.

[0042] Step 2, chemical dealloying treatment:

[0043] The precursor alloy material prepared by cladding was immersed in 3mol / L HCL solution and corroded for 8 hours until the reaction stopped, and then the micro-nano structure intermediate obtained after corrosion was ...

Embodiment 3

[0045] 1. Raw materials:

[0046] (1) Aluminum-silicon powder (-325 mesh, 99%), Al:Si=50:50wt.%, particle size about 80 μm.

[0047] (2) Aluminum plate, purity: 99.0%, size: 100mm×50mm×5mm.

[0048] (3) Etching solution: 3mol / L HCL solution.

[0049] 2. Preparation method

[0050] Step 1: Preparation of precursor alloy material:

[0051] Put the aluminum-silicon powder on the base material aluminum plate (100mm×50mm×5mm), the preset thickness is about 2mm, use YLS-6000 fiber laser for cladding, laser power: 5.5kW, spot diameter: 5mm, scanning speed: 10mm / s, argon shielding gas flow: 15L / min. Then wire cutting is used to separate the cladding layer from the substrate to obtain a precursor alloy material.

[0052] Step 2, chemical dealloying treatment:

[0053] The precursor alloy material prepared by cladding was immersed in 3mol / L HCL solution and corroded for 12 hours until the reaction stopped, and then the micro-nano structure intermediate obtained after corrosion was w...

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Abstract

The invention discloses a method for preparing a micro-nano structured block silicon material through compounding laser cladding and chemical dealloying. The method comprises the following steps: preparing an aluminum-magnesium alloy cladding layer on a matrix through adopting a laser cladding technology, separating the cladding layer from the matrix to obtain a precursor alloy material, carrying out chemical dealloying treatment on the precursor alloy material obtained after the cladding treatment by adopting a corrosive, and removing the element aluminum to finally obtain the micro-nano structured block silicon material. The method has the advantages of simple operation, short preparation period and high efficiency, and the prepared micro-nano structured block silicon material can be applied to the fields of solar batteries, lithium ion batteries and biology.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a method for preparing a micro-nano structure bulk silicon material by using an aluminum-silicon alloy as a raw material and adopting a laser cladding technology combined with a chemical dealloying technology. Background technique [0002] When the silicon surface has micro / nanostructures, the optical and electrical properties of the material can be changed. These properties have great potential for high-efficiency utilization of solar energy, absorption of specific frequency waves, improvement of electrochemical performance of lithium-ion battery anode materials, and applications in many fields such as biology. Therefore, it is very important to explore practical and efficient silicon surface micro / nanostructure preparation technology and control its morphology characteristics. At present, the methods for preparing micro-nano silicon mainly include template method (m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/021C04B38/04C04B35/515
CPCC04B35/515C04B38/045C04B2235/428C04B2235/5436
Inventor 黄婷孙丁月肖荣诗杨武雄
Owner BEIJING UNIV OF TECH
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