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Preparation method of selective laser melting formed nano TiB2 reinforced aluminum-based composite material

A technology of laser selective melting and composite materials, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc. It can solve the problems of low laser absorption rate, high viscosity of metal solution, and poor fluidity

Inactive Publication Date: 2021-04-23
SHANGHAI SPACE PRECISION MACHINERY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low laser absorption rate and high thermal conductivity lead to low temperature of molten pool during forming process, high viscosity of metal melt, poor fluidity, easy to produce pores, cracks and other defects after solidification, which restricts the development of aluminum alloy in the field of laser selective melting technology

Method used

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  • Preparation method of selective laser melting formed nano TiB2 reinforced aluminum-based composite material
  • Preparation method of selective laser melting formed nano TiB2 reinforced aluminum-based composite material
  • Preparation method of selective laser melting formed nano TiB2 reinforced aluminum-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A Laser Selective Melting Nano-TiB 2 Particle-reinforced aluminum matrix composite material, the preparation method is as follows:

[0025] Step 1: The mixed powder has a purity > 99.9%, a particle size of 15-53 μm, and a shape of high-purity spherical AlSi10Mg powder, and a purity > 99.9%, a particle size of 50-100 nm, and a shape of TiB with an irregular structure. 2 Powder composition, TiB in mixed powder 2 The mass fraction is 1wt.%, figure 1 is the composite powder morphology after powder mixing;

[0026] Step 2: Put the mixed powder in step (1) into the mixing cylinder. For powder mixing, rotate forward for 30 minutes at a speed of 12 rpm, reverse for 30 minutes at a speed of 12 rpm, repeat the above steps once, and blend the powder for 120 minutes.

[0027] Step 3: put the mixed composite powder into the oven, the temperature of the powder is 120°C, the time of the powder is 3 hours, and it is cooled with the furnace.

[0028] Step 4: Establish a three-dimen...

Embodiment 2

[0032] A Laser Selective Melting Nano-TiB 2 Particle-reinforced aluminum matrix composite material, the preparation method is as follows:

[0033] Step 1: The mixed powder has a purity > 99.9%, a particle size of 15-53 μm, and a shape of high-purity spherical AlSi10Mg powder, and a purity > 99.9%, a particle size of 50-100 nm, and a shape of TiB with an irregular structure. 2 Powder composition, TiB in mixed powder 2 The mass fraction of is 2wt.%.

[0034] Step 2: Put the mixed powder in step (1) into the mixing cylinder. Mix the powder by rotating forward for 50min at a speed of 12rpm, reverse for 50min at a speed of 12rpm, repeat the above steps once, and blend the powder for 200min.

[0035] Step 3: put the mixed composite powder into the oven, the temperature of the powder is 120°C, the time of the powder is 3 hours, and it is cooled with the furnace.

[0036] Step 4: Establish a three-dimensional digital model of the sample to be processed, and use layering software t...

Embodiment 3

[0040] A Laser Selective Melting Nano-TiB 2 Particle-reinforced aluminum matrix composite material, the preparation method is as follows:

[0041] Step 1: The mixed powder has a purity > 99.9%, a particle size of 15-53 μm, and a shape of high-purity spherical AlSi10Mg powder, and a purity > 99.9%, a particle size of 50-100 nm, and a shape of TiB with an irregular structure. 2 Powder composition, TiB in mixed powder 2 The mass fraction of is 3wt.%.

[0042] Step 2: Put the mixed powder in step (1) into the mixing cylinder. For powder mixing, rotate forward for 70 minutes at a speed of 12 rpm, reverse for 70 minutes at a speed of 12 rpm, repeat the above steps once, and blend the powder for 280 minutes.

[0043] Step 3: put the mixed composite powder into the oven, the temperature of the powder is 120°C, the time of the powder is 3 hours, and it is cooled with the furnace.

[0044] Step 4: Establish a three-dimensional digital model of the sample to be processed, and use layer...

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Abstract

The invention provides a nano TiB2 reinforced aluminum-based composite material prepared through selective laser melting and a method thereof. The method comprises the following steps of (1) selecting high-purity spherical AlSi10Mg powder with the purity greater than 99.9% and a particle size of 15-53 microns, and irregular structure TiB2 powder with the purity greater than 99.9% and a particle size of 50-100 nm, (2) mechanically mixing the two kinds of powder, and uniformly mixing the two kinds of powder under the condition that the original characteristics of matrix powder are not damaged; and (3) preparing a high-density composite material forming sample with reinforced phase particles uniformly distributed on an aluminum alloy matrix by adopting a selective laser melting forming technology. By adding the nano-reinforced particles into the aluminum alloy matrix, the comprehensive mechanical properties of the aluminum alloy can be effectively improved under the synergistic strengthening action of fine grain strengthening and dispersion strengthening.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing, in particular to a nano-TiB 2 Reinforced aluminum matrix composite material and its preparation method. Background technique [0002] Selective Laser Melting (SLM), as the most cutting-edge and potential forming technology in the field of additive manufacturing technology, is an important development direction of advanced manufacturing technology. Laser selective melting can shorten the product development cycle, form parts with complex structures, and reduce the cost of personalized customization. At the same time, due to the rapid melting mechanism of the laser selective melting process, it is beneficial to obtain a microstructure with fine grains inside the workpiece, thereby improving the comprehensive mechanical properties of the workpiece. [0003] Aluminum alloy has the advantages of low density, high specific strength, good thermal conductivity, electrical conductiv...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C1/10C22C21/02C22C32/00B22F1/00B22F10/28B82Y30/00
CPCB22F1/0003B82Y30/00C22C1/05C22C21/02C22C32/0073
Inventor 杜磊柯林达肖美立窦恩惠赖彩芳罗志强李宝辉戴铮
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
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