A kind of preparation method and product of spherical metal-based nano-ceramic composite material for three-dimensional printing

A technology of nano-ceramics and composite materials, applied in the field of materials, can solve problems such as easy aggregation of nano-ceramic particles, local stress concentration of nanoparticles, and limited material adaptability, so as to ensure uniform particle size, improve thermal conductivity, and increase productivity Effect

Active Publication Date: 2020-08-18
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there are relatively few researches on the laser additive manufacturing process using metal-based nano-ceramic composites as raw materials at home and abroad. Among them, Gu Dongdong from Nanjing University of Aeronautics and Astronautics mainly used ball milling to prepare metal-based nano-ceramic composite powders as raw materials. SLM technology is used for molding. However, nano-ceramic particles are easily agglomerated due to strong van der Waals force and high surface tension. It is difficult to make nano-ceramic particles in alloy powder by traditional ball milling and other mechanical mixing methods. Evenly dispersed in the medium, the agglomeration of nanoparticles easily leads to local stress concentration, which becomes the source of cracks during the loading process
Wang Haowei of Shanghai Jiaotong University and others mainly used the mixed salt method to prepare metal-based nano-ceramic composite materials through in-situ reaction, and then used a gas atomization device to prepare spherical composite powder and perform SLM molding. Although this method solves the problem of nano-ceramic particles Agglomeration problem, but material adaptability is limited, not all metal matrix nano-ceramic composites can be prepared by this method

Method used

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  • A kind of preparation method and product of spherical metal-based nano-ceramic composite material for three-dimensional printing
  • A kind of preparation method and product of spherical metal-based nano-ceramic composite material for three-dimensional printing
  • A kind of preparation method and product of spherical metal-based nano-ceramic composite material for three-dimensional printing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] refer to figure 1 , the preparation of spherical metal-based nano-ceramic composites for three-dimensional printing includes the following steps:

[0033] (1) Add the aluminum alloy to the crucible of the high-frequency electromagnetic induction furnace, and vacuumize the crucible so that the vacuum degree in the crucible is 4.0×10 -3 Pa, and then filled with helium, the pressure of the helium is 0.3MPa, and the induction current with an intensity of 75A is adjusted to heat, so that the aluminum alloy is melted to form a melt, and the temperature of the melt is controlled at 30°C higher than the melting point of the aluminum alloy.

[0034] (2) Pour the melt obtained in step 1) into a tundish, and electromagnetically stir for 30 minutes at a speed of 150 r / min to remove impurities in the melt and homogenize it to obtain molten metal;

[0035] (3) Pass the molten metal obtained in step (2) through the pressure swirl guide tube with a spiral structure to form a rotating ...

Embodiment 2

[0038] refer to figure 1 , the preparation of spherical metal-based nano-ceramic composites for three-dimensional printing includes the following steps:

[0039] (1) Add the titanium alloy into the crucible of the high-frequency electromagnetic induction furnace, and vacuumize the crucible so that the vacuum degree in the crucible is 6.0×10 -3 Pa, and then filled with nitrogen gas, the pressure of the nitrogen gas is 0.2MPa, and the induction current with an intensity of 100A is adjusted to heat, so that the titanium alloy is melted to form a melt, and the temperature of the melt is controlled at 60°C higher than the melting point of the titanium alloy;

[0040] (2) Pour the melt obtained in step 1) into a tundish, and electromagnetically stir for 25 minutes at a speed of 100 r / min to remove impurities in the melt and homogenize it to obtain molten metal;

[0041] (3) Pass the molten metal obtained in step (2) through the pressure swirl guide tube with a spiral structure to f...

Embodiment 3

[0043] refer to figure 1 , the preparation of spherical metal-based nano-ceramic composites for three-dimensional printing includes the following steps:

[0044] (1) Add the iron-carbon alloy to the crucible of the high-frequency electromagnetic induction furnace, and vacuumize the crucible so that the vacuum degree in the crucible is 5.0×10 -3 Pa, then filled with argon gas, the pressure of the argon gas is 0.1MPa, and the induction current with a control intensity of 50A is heated to melt the iron-carbon alloy to form a melt, and the temperature of the melt is controlled at 100°C higher than the melting point of the iron-carbon alloy ;

[0045] (2) Pour the melt obtained in step 1) into a tundish, and electromagnetically stir for 15 minutes at a speed of 200 r / min to remove impurities in the melt and homogenize it to obtain molten metal;

[0046] (3) Pass the molten metal obtained in step (2) through the pressure swirl guide tube with a spiral structure to form a rotating ...

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Abstract

The invention relates to a preparation method and product of a spherical metal-based nano-ceramic composite material for three-dimensional printing, and belongs to the field of material technology. In this method, the first choice is to prepare molten metal, and then make the molten metal form a rotating metal liquid film with a pyramidal structure, and then Nano-ceramic particles are carried synchronously by high-pressure gas to realize gas-solid two-phase injection of metal melt liquid film, so as to prepare spherical metal-based nano-ceramic composite materials with nano-ceramic particles evenly distributed on the surface of metal spherical powder. This method solves the problem of relying on ball milling, etc. When the two materials are mechanically mixed, the nanomaterials are prone to agglomeration, which leads to the problem of uneven composition and particle size distribution. And by controlling the degree of the vertex angle of the metal liquid film, it can ensure that the composite material has a high yield. The composite material prepared by this method, because the nano-ceramic particles are evenly distributed on the surface of the metal spherical powder, is conducive to improving the thermal conductivity of the powder and the absorption rate of the laser, thereby effectively improving the efficiency of metal laser additive manufacturing.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a preparation method and product of a spherical metal-based nano-ceramic composite material for three-dimensional printing. Background technique [0002] With the increasing demand for lightweight, high-strength, high-hardness, high thermal conductivity, and high wear-resistant alloy materials in aerospace, national defense and military industries, the design and preparation of metal-based nano-ceramic composites has become a research hotspot at home and abroad. With the help of nano ceramic particles (commonly used nano ceramics include Al 2 o 3 , TiC, TiB 2 , SiC, SiO 2 etc.) The metal matrix composites obtained by strengthening can significantly improve the mechanical properties of traditional alloy materials, and have been widely studied and applied in practical engineering. [0003] At present, metal-based nano-ceramic composites are mainly prepared by trad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08B22F1/00B22F3/105C22C1/05C22C1/10C22C21/00C22C14/00C22C32/00B33Y70/10
CPCC22C1/05C22C14/00C22C21/00C22C32/0052B22F9/082B33Y70/00B22F2009/0824B22F10/00B22F1/065B22F10/25B22F12/53B22F10/32Y02P10/25
Inventor 王林志王国玉吴姣娇
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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