Method for preparing Mg2Si/Al composite material in situ by laser deposition

A technology of laser deposition and composite materials, applied in metal material coating process, coating and other directions, can solve the problems of mixing impurities, sharp corner cracks, coarse Si, etc., to achieve easy operation, reduce Mg loss, and small grain size. Effect

Active Publication Date: 2018-09-21
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these methods can solve the problem of nascent Mg 2 Coarse Si, Mg 2 Problems such as Si sharp corners splitting the substrate and impurities mixed in the preparation process

Method used

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  • Method for preparing Mg2Si/Al composite material in situ by laser deposition
  • Method for preparing Mg2Si/Al composite material in situ by laser deposition
  • Method for preparing Mg2Si/Al composite material in situ by laser deposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In-Situ Preparation of Mg by Laser Deposition 2 The method for Si / Al composite material, comprises the following steps:

[0027] (1) Pre-treat the surface of the laser-deposited substrate, clean the dirt, rust and dust on the surface of the substrate, and dry it for later use.

[0028] (2) The Al-50%Mg alloy powder and Al-9%Si alloy powder are mixed according to the mass ratio of Al:Mg:Si of 7:2:1 in a planetary ball mill at a speed of 200r / min for two hours. uniform.

[0029] (3) Put the ball-milled powder into a vacuum drying oven, dry it at 60°C for 2 hours, lay it flat on the flat plate in the groove of the fixture, spray the binder solution evenly to form a uniform water layer, and put it together with the concave The grooved plate is stably placed in a vacuum drying oven, heated and hardened under vacuum at 50-60° C. for 5 hours, and the grooved plate is removed. Obtain the required pre-slices and store them in a vacuum-dried environment.

[0030] (4) Place th...

Embodiment 2

[0035] In-Situ Preparation of Mg by Laser Deposition 2 The method for Si / Al composite material, comprises the following steps:

[0036] (1) Pre-treat the surface of the laser-deposited substrate, clean the dirt, rust and dust on the surface of the substrate, and dry it for later use.

[0037] (2) Al-50% Mg alloy powder and Al-9% Si alloy powder are mixed according to the Mg: Si mass ratio of 2:1, wherein Al: Mg: Si is 7:2:1, in the planetary ball mill Rotate at 200r / min for two hours to make the powder evenly mixed.

[0038] (3) Put the ball-milled powder into a vacuum drying oven, dry it at 60°C for 2 hours, lay it flat on the flat plate in the groove of the fixture, spray the binder solution evenly to form a uniform water layer, and put it together with the concave The grooved plate is stably placed in a vacuum drying oven, heated and hardened under vacuum at 50-60°C for 5 hours, the grooved plate is removed to obtain the required pre-set, and stored in a vacuum-dried envi...

Embodiment 3

[0041] In-Situ Preparation of Mg by Laser Deposition 2 The method for Si / Al composite material, comprises the following steps:

[0042] (1) Pre-treat the surface of the laser-deposited substrate, clean the dirt, rust and dust on the surface of the substrate, and dry it for later use.

[0043] (2) Al-50% Mg alloy powder and Al-9% Si alloy powder are mixed according to the Mg: Si mass ratio of 2:1, wherein Al: Mg: Si is 7:2:1, in the planetary ball mill Rotate at 200r / min for two hours to make the powder evenly mixed.

[0044] (3) Put the ball-milled powder into a vacuum drying oven, dry it at 60°C for 2 hours, lay it flat on the flat plate in the groove of the fixture, spray the binder solution evenly to form a uniform water layer, and put it together with the concave The grooved plate is stably placed in a vacuum drying oven, heated and hardened under vacuum at 50-60°C for 5 hours, the grooved plate is removed to obtain the required pre-set, and stored in a vacuum-dried envi...

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Abstract

The invention belongs to the field of composite material preparation, relates to a method for preparing an Mg2Si enhanced Al based composite material, in particular to a novel method for preparing anMg2Si / Al composite material in situ by laser deposition, and belongs to the technical field of composite material preparation. The method is characterized in that a traditional casting method is omitted, and an advanced laser deposition technology with high material use ratio is adopted. Al-50% Mg powder and Al-9% Si powder are placed into a ball mill according to the mass fraction 7:2:1 of Al, Mgand Si, the powder is prepared into a preset piece, the preset piece is fixed onto a 6061 aluminum alloy substrate, and single-channel multilayer laser deposition is performed with the laser power of800W-1100W, the scanning speed of 200mm / min-400mm / min and the spot diameter of 1.5mm to obtain the Mg2Si / Al composite material. The method is simple in process and convenient to operate, grain sizesare small, and mechanical properties are good.

Description

technical field [0001] The invention belongs to the field of composite material preparation and relates to a method for preparing Mg 2 Methods for Si-reinforced Al-based composites. Background technique [0002] Mg 2 Si is an intermetallic compound with low density and high strength and hardness. Its presence in an appropriate amount in the alloy can improve the mechanical properties of the alloy and is an ideal reinforcing phase for aluminum matrix composites. Preparation of Mg 2 The methods of Si reinforced aluminum matrix composites mainly include melting method, ordinary casting method, centrifugal casting method, spray deposition method and mechanical alloying method. However, none of these methods can solve the problem of nascent Mg 2 Coarse Si, Mg 2 Si sharp corners split the substrate and impurities are mixed in the preparation process. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a simple operat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 胡勇余楠赵龙志刘德佳
Owner EAST CHINA JIAOTONG UNIVERSITY
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