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Method for preparing special-shaped parts of silicon carbide aluminum nitride composite materials by using slm

An aluminum composite material and a composite material technology are applied in the field of preparing silicon carbide aluminum nitride composite special-shaped parts, which can solve problems such as content limitation, and achieve the effects of low cost, complex and diverse shapes, and short production cycle.

Active Publication Date: 2021-12-21
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The materials prepared by these methods have a simple structure, and at the same time, in order to obtain good sintering properties, the content of SiC and AlN is also limited.

Method used

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  • Method for preparing special-shaped parts of silicon carbide aluminum nitride composite materials by using slm
  • Method for preparing special-shaped parts of silicon carbide aluminum nitride composite materials by using slm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The method for preparing special-shaped parts of silicon carbide aluminum nitride composite materials by SLM comprises the following steps:

[0027] S1. Mix metal aluminum powder with a weight percentage of 65 to 75 wt % and a sphericity of 75 to 99 % and silicon powder with a weight percentage of 25 to 35 wt % to obtain a mixed powder; the average sphericity of the aluminum powder is ≥80 %, the purity of metal aluminum powder is industrial grade or analytical grade, and its average particle size is ≤55 μm; the purity of silicon powder is industrial grade or analytical grade, and its average particle size is ≤70 μm.

[0028] S2. Put the mixed powder obtained in S1 into a 3D printing device, and perform SLM molding under an argon protective atmosphere to obtain a silicon / aluminum composite special-shaped part body;

[0029] Specifically, include:

[0030] In the above S2, the process parameters of the selective laser melting: the laser power is 100-500W, the powder coat...

Embodiment 2

[0033] The method for preparing special-shaped parts of silicon carbide aluminum nitride composite materials by SLM comprises the following steps:

[0034] S1. Mix metal aluminum powder with a weight percentage of 70 to 75 wt % and a sphericity of 75 to 99 % and silicon powder with a weight percentage of 25 to 30 wt % to obtain a mixed powder; the average sphericity of the aluminum powder is ≥ 80 %, the purity of metal aluminum powder is industrial grade or analytical grade, and its average particle size is ≤55 μm; the purity of silicon powder is industrial grade or analytical grade, and its average particle size is ≤70 μm.

[0035] S2. Put the mixed powder obtained in S1 into a 3D printing device, and perform SLM molding under an argon protective atmosphere to obtain a silicon / aluminum composite special-shaped part body;

[0036] Specifically, include:

[0037] In the above S2, the process parameters of the selective laser melting: the laser power is 100-500W, the powder coa...

Embodiment 3

[0040] The method for preparing special-shaped parts of silicon carbide aluminum nitride composite materials by SLM comprises the following steps:

[0041] S1. Mix metal aluminum powder with a weight percentage of 75 to 85 wt % and a sphericity of 75 to 99 % and silicon powder with a weight percentage of 15 to 25 wt % to obtain a mixed powder; the average sphericity of the aluminum powder is ≥ 80 %, the purity of metal aluminum powder is industrial grade or analytical grade, and its average particle size is ≤55 μm; the purity of silicon powder is industrial grade or analytical grade, and its average particle size is ≤70 μm.

[0042] S2. Put the mixed powder obtained in S1 into a 3D printing device, and perform SLM molding under an argon protective atmosphere to obtain a silicon / aluminum composite special-shaped part body;

[0043] Specifically, include:

[0044]In the above S2, the process parameters of the selective laser melting: the laser power is 100-500W, the powder coat...

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Abstract

The invention discloses a method for preparing special-shaped parts of silicon carbide / aluminum nitride composite materials by using SLM, comprising the following steps: S1. uniformly mixing metal aluminum powder and silicon powder to obtain a mixed powder; S2. mixing the mixed powder obtained in S1 The body is subjected to SLM molding under an argon protective atmosphere to obtain a silicon / aluminum composite special-shaped part blank; S3. The blank obtained in S2 is buried in carbon, and then subjected to microwave nitriding treatment, and silicon carbide / nitridation is obtained after cooling. Aluminum composite profiled parts. By adopting the SLM method in the present invention, the dimensional error of the formed parts is within 0.01mm, and the surface is smooth, which can be used directly without subsequent treatment, and the cost is low; at the same time, the silicon carbide / aluminum nitride composite material in the present invention has strong adaptability , It can process and shape various refractory and difficult-to-process materials.

Description

technical field [0001] The invention relates to the field of 3D printing, in particular to a method for preparing special-shaped parts of silicon carbide aluminum nitride composite materials by using SLM. Background technique [0002] Silicon carbide aluminum nitride composite material has good insulation, high thermal conductivity, excellent mechanical properties and excellent oxidation resistance, and is a material of great research value. At present, the preparation methods of silicon carbide aluminum nitride composite materials mainly include: pressureless reaction sintering method, hot pressing sintering and spark plasma sintering. [Pressureless sintering and thermal conductivity of SiC-AlN composite ceramic materials[J], Vacuum Electronic Technology—Electronic Ceramics, Ceramics-Metal Sealing Special. 2014] using SiC powder and AlN powder as raw materials, using pressureless sintering SiC-AlN composite ceramic materials were prepared at 2000-2100℃ by the method of 200...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/65B33Y10/00B33Y70/00
CPCC04B35/573B33Y10/00B33Y70/00C04B2235/3865C04B2235/402C04B2235/428
Inventor 李发亮张家莲张海军张少伟
Owner WUHAN UNIV OF SCI & TECH
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