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Preparation method of metal-matrix nanocomposite

A nano-composite material and metal-based technology, applied in the field of metal-based nano-composite material preparation, can solve the problems of large test volume, complex thermal cracking parameters, time-consuming, etc., to improve mechanical properties, suppress thermal cracking, and operability high effect

Active Publication Date: 2018-11-13
迈特李新材料(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Reduce hot cracking by optimizing process parameters, however, the parameters affecting hot cracking are complex, and a large number of trials are required to obtain the optimal process parameters. The amount of testing is huge and time-consuming
In addition, this method can only reduce the number of hot crack defects to a certain extent, and cannot fundamentally inhibit the formation of hot cracks

Method used

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  • Preparation method of metal-matrix nanocomposite

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Embodiment 1

[0041] This embodiment provides a method for preparing an aluminum-based nanocomposite, which includes the following steps:

[0042] S1) Select the target metal and prepare the elemental substance that makes up the target metal: the target metal is AA7075 aluminum alloy, and the AA7075 aluminum alloy contains the following elements in weight percentage: Zn 5.1%-6.1%, Mg 2.1%-2.9%, Cu 1.2% ~2.0%, Cr 0.18%~0.28%, the rest is Al;

[0043] S2) Melting pure aluminum at 800°C to obtain molten aluminum; during the melting process, argon gas is introduced for protection;

[0044] S3) Add the mixture of salt and nano-reinforcement to the aluminum melt; when the salt melts, stir; the salt contains the components in weight percentage: 27% MgF 2 , 21%CaF 2 and 52% BaF 2 , the melting point of the salt is 777°C; the nano reinforcement is TiC nanoparticles, and the particle size of the TiC particles is 40-60nm; the volume fraction of TiC nanoparticles in the mixture of nanoparticles and ...

Embodiment 2

[0049] The present embodiment provides a kind of preparation method of magnesium-based nanocomposite material, it comprises the following steps:

[0050] S1) Select the target metal and prepare the elemental substance that makes up the target metal: the target metal is only pure magnesium;

[0051] S2) Melting pure magnesium at 750°C to obtain a pure magnesium melt; during the melting process, a mixed gas of carbon dioxide and sulfur tetrafluoride is introduced for protection;

[0052] S3) Add the mixture of salt and nanoparticles to the pure magnesium melt; when the salt is melted, stir; the salt contains components in percentage by weight: 54% KCl, 12% NaCl, 4% NaF and 30% CaCl 2 , the melting point of the salt is 535°C; the nanoparticles are Al 2 o 3 Particles, Al 2 o 3 The particle size of the particles is 30-50nm; Al 2 o 3 The volume fraction of nanoparticles in the mixture of nanoparticles and salt is 10%;

[0053] S4) Mechanical stirring at 200rpm for 20min, Al ...

Embodiment 3

[0057] The present embodiment provides a kind of preparation method of copper-based nanocomposite material, it comprises the following steps:

[0058] S1) Select the target matrix alloy, and prepare the elemental substances that make up the target matrix alloy: the target matrix alloy is QA15 copper alloy. QA15 copper alloy contains the following elements in weight percentage: Al 4.0%~6.0%, Zn0.5%, Mn 0.5%, Fe0.5%, Ni 0.5%, Sn 0.1%, and the rest is Cu;

[0059] S2) Melting pure copper at 1150°C to obtain a copper melt; during the melting process, argon gas is introduced for protection;

[0060] S3) Add the mixture of salt and nano reinforcement to the copper melt; when the salt melts, stir; the salt is Na 2 B 4 o 7 , Na 2 B 4 o 7 The melting point of the nanowire is 880°C; the nano reinforcement is WC nanowire, and the diameter of the WC nanowire is 80-100nm; the volume fraction of the nanowire in the mixture of the salt and the nanowire is 15%;

[0061] S4) Stir mechan...

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Abstract

The invention discloses a preparation method of a metal-matrix nanocomposite, and belongs to the field of metal material preparation. According to the preparation method of the metal-matrix nanocomposite, high-content and evenly distributed nano-reinforcement bodies are added into target metal through molten salt assisting, thus the hot-crack tendency of matrix metal is reduced and the forming property of the matrix metal is improved while the matrix structure is refined and matrix strength is improved. The prepared metal-matrix nanocomposite can be widely applied to the field of casting, welding and 3D printing.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and in particular relates to a method for preparing a metal-based nanocomposite material. Background technique [0002] Due to the advantages of high strength and high fracture toughness, advanced metal materials have broad application prospects in aerospace, automotive and other industrial fields. However, the absolute strength of most pure metals (such as pure magnesium, pure aluminum, pure copper, etc.) and some alloys is low, and the wide application of these pure metals and alloys is severely restricted. In addition, some alloys with high thermal cracking tendency, such as 2000 series (Al-Cu) and 7000 series (Al-Zn) high-strength aluminum alloys, have poor formability in casting, welding and 3D printing due to their wide solidification range. And thermal cracks often appear in the process of 3D printing, which seriously reduces the mechanical properties of castings, welded joints a...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C1/06C22C1/10C22C23/02C22C47/08C22C49/14C22C19/05C22C49/08C22C49/02C22C21/10C22C32/00B33Y70/00B23K35/02B23K35/28C22C101/12
CPCB23K35/0261B23K35/288B33Y70/00C22C1/03C22C1/06C22C1/1036C22C19/056C22C21/10C22C23/02C22C32/0036C22C32/0052C22C47/08C22C49/02C22C49/08C22C49/14
Inventor 李晓春刘伟清刘志威
Owner 迈特李新材料(深圳)有限公司
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