Preparation method of laser 3D-printed complex-configuration silicon carbide composite part

A 3D printing and composite material technology, which is applied in the field of laser 3D printing complex configuration silicon carbide composite material parts to achieve high reliability, optimized performance, and good repeatability.

Active Publication Date: 2021-04-09
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical purpose of the present invention is to provide a preparation method for laser 3D printing complex configuration silicon carbide composite parts in view of the deficiencies of existing methods

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  • Preparation method of laser 3D-printed complex-configuration silicon carbide composite part
  • Preparation method of laser 3D-printed complex-configuration silicon carbide composite part
  • Preparation method of laser 3D-printed complex-configuration silicon carbide composite part

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preparation example Construction

[0040] The preparation method of the present invention does not require fiber preform molding or mold manufacturing processes, the molding process is simple and easy to control, it is easy to regulate the percentage of chopped carbon fibers in a wide range, and the introduction of multi-phase powder makes it homogeneously compounded. Adjust the composition ratio of organic and inorganic powder materials in a wide range, so as to fully optimize and improve the performance of composite materials, and realize the stable manufacture of silicon carbide composite products with complex configurations, especially with unique advantages in the manufacture of special structural parts.

[0041] The silicon carbide composite material part obtained by the preparation method has a three-dimensional uniform macroscopic and microscopic structure. In some embodiments, the silicon carbide composite part has a relative density of ~51% and a three-point bending strength of ~5 MPa.

Embodiment 1

[0044] (1) In the stirring mixer, add 10vol% of chopped carbon fiber powder with a length and diameter of 60 μm and 6 μm respectively, 20 vol% of silicon carbide powder with an average particle size of 30 μm, and phenolic resin with an average particle size of 70 μm in proportion by volume 50vol%, 20vol% carbon black with an average particle size of 10μm. The stirring speed of the stirring mixer is controlled to 200 rpm, and the stirring time is 10 minutes to form a compounded homogeneous multi-phase powder.

[0045] (2) By means of laser 3D printing, the homogeneous multi-phase powder is printed and formed to obtain a silicon carbide composite material blank. The laser 3D printing system is: CO 2 The laser power is 35W, the powder coating thickness is 0.1mm, and the powder bed preheating temperature is 70°C.

[0046] (3) The green body formed by laser printing was degreased in a vacuum atmosphere, and the temperature of the green body was raised to 600 °C in vacuum at a hea...

Embodiment 2

[0049] (1) In the stirring mixer, add 20vol% of chopped carbon fiber powder with a length and diameter of 150 μm and 6 μm respectively, 45 vol% of silicon carbide powder with an average particle size of 80 μm, and phenolic resin with an average particle size of 20 μm in proportion by volume 30vol%, 5vol% carbon black with an average particle size of 5μm. The stirring speed of the stirring mixer is controlled to 250 rpm, and the stirring time is 30 minutes to form a compounded homogeneous multi-phase powder.

[0050] (2) By means of laser 3D printing, the homogeneous multi-phase powder is printed and formed to obtain a silicon carbide composite material blank. The laser 3D printing system is: CO 2 The laser power is 60W, the powder coating thickness is 0.06mm, and the powder bed preheating temperature is 90°C.

[0051] (3) The green body formed by laser printing was degreased in a vacuum atmosphere, and the temperature of the green body was raised to 550° C. in vacuum at a he...

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Abstract

The invention discloses a preparation method of a laser 3D-printed complex-configuration silicon carbide composite part. The preparation method comprises the following steps that (1) preparing composite raw powder for laser 3D printing, wherein the composite raw powder comprises, by volume percent, 10-70% of chopped carbon fibers, 20-70% of silicon carbide, 20-50% of organic resin with a carbon residue rate larger than 35%, and 5-20% of carbon black; (2) molding the composite raw powder into a silicon carbide composite biscuit with a complex configuration by adopting a laser 3D printing method; (3) degreasing the biscuit in a vacuum atmosphere to crack and carbonize the organic resin and form a degreased biscuit completely composed of inorganic matters; and (4) carrying out liquid-phase reaction siliconizing on the degreased biscuit in a vacuum environment to obtain the laser 3D-printed complex-configuration silicon carbide composite part.

Description

technical field [0001] The invention belongs to the technical field of material forming, and in particular relates to a method for preparing silicon carbide composite parts with complex configurations by laser 3D printing. Background technique [0002] Laser 3D printing is one of the advanced manufacturing technologies that has received widespread attention and rapid development in recent years. Its main principle is to use a laser that can generate high energy as the energy source, and according to the predetermined processing path, the flat powder is softened, melted or solidified layer by layer to achieve orderly accumulation and rapid prototyping. Laser 3D printing is easy to realize the efficient and reliable manufacturing of parts with complex shapes. In theory, any CAD graphics can be printed as high-precision samples. [0003] Silicon carbide composite materials have the characteristics of low density, high toughness, high reliability, excellent thermal stability an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/622B33Y70/10B33Y10/00C04B35/64C04B35/638
CPCC04B35/622B33Y70/10B33Y10/00C04B35/64C04B35/638C04B2235/5248C04B2235/3826C04B2235/424C04B2235/428C04B2235/6562C04B2235/6567C04B2235/96
Inventor 黄政仁殷杰刘学建陈忠明姚秀敏朱云洲裴兵兵陈健
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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