Near clean shaping preparation method of granular reinforced metal base composite material based on region selection laser sintering

A selective laser sintering and near-net shape technology, which is applied in the field of composite materials, can solve problems such as difficulty, high melt density, unfavorable impurities and gas discharge, and achieve low cost, large size, easy control of volume fraction, and perfect stability Effect

Inactive Publication Date: 2007-05-30
NANCHANG AERONAUTICAL ENG INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the casting method, the disadvantages of the liquid stirring method are: the high-speed stirring liquid metal will be wrapped in gas and inclusions, there will be segregation, the mixing and compounding process is also quite difficult, and the amount of addition is also limited; the shortcomings of the semi-solid stirring method It is because the melt has a high density, which is not conducive to the discharge of impurities and gases, and it is difficult to control the temperature; the ordinary piezo-infiltration method has the problem that the internal structure is not dense enough, and in order to ensure that the melt has a certain fluidity after compounding
The particle size is generally larger than 10 μm, and the reinforcement effect is limited to a certain extent; due to the poor wettability of the ceramic reinforcement particles and the molten metal, it is difficult to achieve a uniform distribution of the reinforcement particles in the stirred casting method. At the same time, the reinforcement particles are easily mixed with the metal melt Severe chemical reactions occur, and the interface bonding is also poor. In addition, the size of reinforcement particles usually needs to be larger than 10 μm, and the volume content is generally about 20%
These preparation methods are difficult to meet the requirements of uniform dispersion of fine-grained reinforcements in composite materials, good interfacial bonding with the matrix, easy control of the volume fraction of reinforcements, high volume fractions, and large-scale complex thin-walled composites. The existing casting method has the disadvantages of uneven dispersion of the reinforcing phase in the matrix, resulting in low performance, difficulty in obtaining high volume fraction, and large and complex thin-walled composite components.

Method used

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  • Near clean shaping preparation method of granular reinforced metal base composite material based on region selection laser sintering

Examples

Experimental program
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Effect test

Embodiment 1

[0022] This example is the preparation of silicon carbide particle reinforced aluminum matrix composite material.

[0023] (1) Preparation of powder materials for selective laser sintering: uniformly mix 20 μm silicon carbide particles and 25% pure aluminum powder to obtain a mixed powder; then add the following fillers to the mixed powder: lubricant: graphite, dispersant: White carbon black, light absorber: carbon black;

[0024] (2) Preparation of the prefabricated part: using the selective laser sintering method, the mixed powder is made of low melting point metal powder: pure aluminum powder as the prefabricated part binder, and the laser selective sintering is directly formed in a nitrogen atmosphere to prepare the reinforcement prefabricated part. Φ35mm×40mm prefabricated parts, the process conditions are: laser power 200W, scanning speed 500mm / s, powder layer thickness 0.2mm, scanning distance 0.2mm;

[0025] (3) Preparation of composite materials: Vacuum variable pres...

Embodiment 2

[0027] This example is the preparation of silicon nitride particle reinforced aluminum matrix composite material.

[0028] (1) Preparation of powder materials for selective laser sintering: 15 μm silicon nitride particles, 10Vol% ammonium dihydrogen phosphate, 10% polypropylene (PP) powder, 10% pure aluminum powder, uniformly mixed and proportioned to obtain a mixed powder, Then add the following fillers to the mixed powder: lubricant: graphite, dispersant: talcum powder, light absorber: carbon black;

[0029] (2) Preparation of the prefabricated part: using the selective laser sintering method, the mixed powder added with the filler is sintered and preformed, and then the reinforced body prefabricated part is prepared by secondary firing to prepare a Φ35mm×40mm prefabricated part. The process conditions are: laser power 22W , the scanning speed is 1800mm / s, the powder layer thickness is 0.15mm, and the scanning distance is 0.2mm; the preform is placed in the sintering furnace...

Embodiment 3

[0032] This example is the preparation of silicon boride particle reinforced magnesium-based composite material.

[0033] (1) Preparation of powder material for selective laser sintering: uniformly mix 11 μm silicon boride particles, 10 Vol% ammonium dihydrogen phosphate and 5% pure magnesium powder to obtain mixed powder;

[0034] (2) Preparation of the prefabricated part: using the selective laser sintering method, the mixed powder is made of low melting point metal powder: pure magnesium powder as the prefabricated part binder, and the laser selective sintering is directly formed under an argon atmosphere to prepare the reinforcement prefabricated part. To form Φ20mm×25mm prefabricated parts, the process conditions are: laser power 150W, scanning speed 800mm / s, powder layer thickness 0.16mm, scanning distance 0.2mm;

[0035] (3) Preparation of composite materials: Vacuum variable die casting infiltration method is adopted, that is, the preform is fixed in a heater in a high...

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Abstract

A method based on laser sinter in chosen region for preparing the ceramic particles-reinforced metal-based composition features that the selective laser sintering (SLS) method is used for easily controlling the volume percentage of reinforcing phase, and the vacuum pressure-varying percolation method is used for controlling the technological parameters (vacuum degree, and the pressure and temp of osmosis). It can be used to shape large thin-wall workpiece with complex shape.

Description

technical field [0001] The present invention relates to composite materials, in particular to a near-net-shape preparation method for particle-reinforced metal matrix composite materials based on selective laser sintering (Selective laser sintering, SLS) for ceramic particles. Background technique: [0002] Particle-reinforced metal matrix composites have excellent mechanical and physical properties such as high specific strength and specific stiffness, wear resistance, low density, good dimensional stability and thermal conductivity. It can be widely used in aerospace, military, automobile, electronics, sports and other fields. Therefore, since the early 1980s, countries all over the world have been competing to research and develop such materials, and have carried out many basic research work from the perspectives of material preparation technology, microstructure, mechanical properties and fracture characteristics, and have achieved remarkable results. At present, develo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D23/06B22D19/02
Inventor 徐志锋余欢胡美忠蔡长春俞子荣严青松万红郑玉惠
Owner NANCHANG AERONAUTICAL ENG INST
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