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Fabrication method of ceramic-based complex structural parts based on selective laser sintering

A laser sintering, complex structure technology, used in additive manufacturing, process efficiency improvement, additive processing, etc., can solve problems such as complex internal structure parts, and achieve the effects of high production efficiency, improved density, and high mechanical properties

Active Publication Date: 2022-04-01
SHANTOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the problem that it is difficult to prepare parts with high performance and complex internal structures at a low cost in the existing technology, this technical solution aims to provide a preparation method based on selective laser sintering of ceramic-based complex structural parts, adding dry pressing treatment, so that Indirect SLS technology can produce high-performance parts with complex internal structures at a lower cost

Method used

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  • Fabrication method of ceramic-based complex structural parts based on selective laser sintering
  • Fabrication method of ceramic-based complex structural parts based on selective laser sintering

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Experimental program
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specific Embodiment approach 1

[0017] Embodiment 1: Preparation of complex ceramic-based structural parts. Concrete preparation method is finished according to the following steps:

[0018] 1) Preparing the green body: using the indirect selective laser sintering technology to obtain the ceramic-based green body;

[0019] 2) Mold loading: placing the ceramic-based green body in a dry pressing mold, filling the inner space of the ceramic-based green body and covering the outer surface of the ceramic-based green body with low compressibility powder;

[0020] 3) Dry pressing treatment: use a press to dry press the dry pressing mold, then take out the dry-pressed ceramic-based green body, remove the low-compressibility powder filled on the surface and inside of the dry-pressed ceramic-based green body, and obtain the ceramic to be sintered base blank;

[0021] 4) Sintering: debinding and sintering the ceramic-based green body to be sintered, and then cleaning to obtain a ceramic-based complex structure.

[0...

specific Embodiment approach 2

[0023] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the indirect method selective laser sintering technology described in step 1 is operated as follows: the size of the printed model is reversed according to the shrinkage rate of the ceramic-based green body. Compensation, and then design the 3D model of the ceramic-based complex structural parts through solid works, and save it as an STL format file and import it into the SLS printing device; set the printing parameters of the SLS printer: the scanning rate is 1800mm / s, and the layer thickness is 0.1mm , the preheating temperature is 45°C; the ceramic-based composite powder is printed layer by layer until the parts are processed, the green body is taken out and the unsintered powder is removed to obtain the ceramic-based green body. Others are the same as the first embodiment.

specific Embodiment approach 3

[0024] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the ceramic matrix composite powder is ceramic composite powder or ceramic and metal composite powder;

[0025] The ceramic composite powder is formed by mixing a ceramic matrix material and a binder, and the mass ratio of the ceramic matrix material to the binder is 20:1-2, wherein the ceramic matrix material is composed of ceramic powder and a sintering aid , the mass fraction of the sintering aid in the ceramic matrix material is 3% to 15%, and the mass fraction of the ceramic powder is 85% to 97%;

[0026] The ceramic and metal composite powder is formed by mixing a ceramic matrix material and a binder, and the mass ratio of the ceramic matrix material to the binder is 20:1-2, wherein the ceramic matrix material is composed of ceramic powder, metal powder The mass fraction of the sintering aid in the ceramic base material is 3% to 10%, the mass fraction of the ceramic powder is 36% to 58.2...

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Abstract

The invention discloses a method for preparing a ceramic-based complex structure based on selective laser sintering, which comprises the steps of: 1) preparing a green body; 2) loading a mold; 3) dry pressing; 4) sintering. The preparation method uses indirect selective laser sintering technology to shape the ceramic-based green body, and then puts it in the mold, and fills the internal pores and outer surfaces of the ceramic-based green body with low-compressibility powder, which limits the ceramic-based green body under the action of external force. Collapse damage occurs. Since the compressibility of the filled low-compressibility powder is lower than that of the ceramic-based green body, under the action of mechanical load, the external force is evenly transmitted to the ceramic-based green body from all directions through the filled low-compressibility powder, so that the particles in the green body and The particles are close to each other, the porosity is reduced, and the density is increased. During the high-temperature solid-phase or liquid-phase sintering process, the particles in the green body are bonded to each other to form a skeleton, the grains grow, the pores are further reduced, and a dense structure is formed. Ceramic matrix complex structural composite parts.

Description

technical field [0001] The invention relates to the technical field of manufacturing special-shaped workpieces from powder, in particular to a method for preparing ceramic-based complex structural parts based on selective laser sintering. Background technique [0002] Selective laser sintering (SLS) technology has a good application prospect in three-dimensional molding of complex structural ceramic / metal parts because of its advantages such as fast forming rate, ability to prepare parts with complex shapes, and high forming precision. Using SLS technology to directly prepare complex ceramic / metal parts requires a high sintering temperature. At present, indirect SLS technology is mainly used to form complex structural parts by melting binders with low melting points, but the porosity and strength of the green body and sintered body obtained are very low and cannot meet the requirements of practical applications, and the compact must be densified to improve the physical and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/64C04B35/565C04B35/10B33Y10/00B33Y70/00B33Y70/10B22F3/105
CPCC04B35/622C04B35/64C04B35/10C04B35/565B33Y70/00B33Y10/00C04B2235/3217C04B2235/3826C04B2235/5436C04B2235/602C04B2235/6026C04B2235/656C04B2235/6562C04B2235/6567C04B2235/96C04B2235/665B22F10/00B22F10/66B22F10/28B22F10/64B22F10/36Y02P10/25
Inventor 曾涛余四文杨帆许国栋
Owner SHANTOU UNIV