Laser 3D-printing silicon carbide ceramic-aluminum composite material and preparation method thereof

A technology for printing silicon carbide ceramics and aluminum composite materials, which is applied in the direction of additive processing, metal processing equipment, transportation and packaging, etc. Uniformity and stability, avoiding pore defects, and improving the effect of comprehensive performance

Inactive Publication Date: 2020-09-15
SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

[0007] To sum up, the current 3D printing of ceramic and metal composite materials is mainly through the preparation of ceramic powder or metal powder into slurry, and then printing out ceramic or metal blanks through 3D printing technology. The advantages of prepar...
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Abstract

The invention discloses a laser 3D-printing silicon carbide ceramic-aluminum composite material. The composite material is prepared from, by volume, 50%-75% of silicon carbide particles, 3%-10% of a binder and 15%-47% of an aluminum alloy matrix. The composite material is characterized in that a silicon carbide porous ceramic preform is formed through laser 3D-printing of the silicon carbide particles and the binder and is filled with an aluminum alloy; the particle size of the silicon carbide particles ranges from 10 [mu]m to 50 [mu]m; and the binder is aluminum powder with the particle sizeranging from 5 [mu]m to [40]mu m. According to the composite material, the porous ceramic preform is prepared with the selective laser sintering 3D-printing technology, the problems that traditional preparation methods are long in technological process, complex in procedure, high in cost and the like are solved, the internal structure of the material is uniform, the size precision of the materialis higher, and the structure stability and the performance reliability of the material are improved remarkably.

Application Domain

Additive manufacturing apparatusTransportation and packaging +1

Technology Topic

Carbide siliconAluminum composites +8

Image

  • Laser 3D-printing silicon carbide ceramic-aluminum composite material and preparation method thereof
  • Laser 3D-printing silicon carbide ceramic-aluminum composite material and preparation method thereof

Examples

  • Experimental program(1)

Example Embodiment

[0019] Example
[0020] A laser 3D printed silicon carbide ceramic aluminum composite material, composed of silicon carbide particles, a binder, and an aluminum alloy matrix. The volume fraction of silicon carbide particles is 60%, the volume fraction of binder is 5%, and the volume fraction of aluminum alloy matrix It is characterized in that the silicon carbide particles and the binder are 3D printed into a silicon carbide porous ceramic preform by laser 3D printing, and the aluminum alloy is filled in the silicon carbide porous ceramic preform; the silicon carbide particle size is 25 μm; The binder is aluminum powder, and the aluminum powder has a particle size of 20 μm; a method for preparing laser 3D printing silicon carbide ceramic-aluminum composite material is characterized by including the following steps:
[0021] (1) Mix the silicon carbide particles and the binder evenly, put them into the laser 3D printing powder bed, and use the selective laser sintering technology to laser 3D print the silicon carbide ceramic porous preform;
[0022] (2) Put the laser 3D printed silicon carbide ceramic porous preform into a high-temperature sintering furnace for high-temperature sintering, the sintering atmosphere is vacuum or argon, and the sintering temperature is 1200°C to obtain the silicon carbide porous ceramic body;
[0023] (3) The surface of the prepared porous silicon carbide ceramic body is processed by numerical control, ultrasonically cleaned with absolute ethanol, dried, and then placed in a graphite mold for tooling;
[0024] (4) Put the tooling in step (3) into a vacuum air pressure infiltration furnace, evacuate to 1.0 Pa, heat up to 600°C, pour the molten aluminum alloy into the tooling, and add air pressure to 2.0 MPa to complete the aluminum The alloy is infiltrated under vacuum pressure to obtain a prepared laser 3D printed silicon carbide ceramic aluminum composite material.
[0025] The compressive strength of the laser 3D printed silicon carbide ceramic-aluminum composite material made by the preparation method of this embodiment reaches about 400 MPa, and the bending strength reaches about 390 MPa; figure 1 Shows the stress-displacement curve of the compressive strength of the laser 3D printed silicon carbide ceramic aluminum composite material, figure 2 Shows the laser 3D printed flexural strength stress-displacement curve of silicon carbide ceramic aluminum composite material.

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