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Selective laser sintering based preparation method of complex-structure porous ceramic

A technology of laser selective sintering and porous ceramics, which is applied to ceramic products, other household utensils, household utensils, etc., can solve the problems of difficult controllable forming of high-complexity porous ceramics and preparation of complex porous ceramics, etc., to achieve large-scale adjustment Scope and controllability, reduced production cost, simple and efficient process

Active Publication Date: 2017-01-11
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for preparing porous ceramics with complex structure based on selective laser sintering. The characteristics of the molding process can prepare porous ceramics with arbitrary complex macroscopic pore structure and unique microscopic pore characteristics, which solves the problem that the traditional process is difficult to form high-complexity porous ceramics in a controllable manner

Method used

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  • Selective laser sintering based preparation method of complex-structure porous ceramic
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  • Selective laser sintering based preparation method of complex-structure porous ceramic

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preparation example Construction

[0031] The embodiment of the present invention provides a method for preparing porous ceramics with a complex structure based on selective laser sintering technology (Selective laser sintering, SLS), the steps of which include:

[0032] (1) Optimize the design of the CAD model of porous ceramics with complex structures according to the application requirements (that is, according to the use occasions and performance requirements of porous ceramics, optimize the design of the macroscopic porous structure, such as: increase or decrease the interconnected pore structure, the inner wall of the smooth hole Or adding special-shaped protrusions on the inner wall of the hole), sliced ​​by the slicing software and saved as an STL file, and the data information of the STL file is imported into the SLS molding equipment, wherein the CAD 3D model can be optimized according to the application requirements. Honeycomb porous structure with interconnecting holes or spatial topological structur...

Embodiment 1

[0045] (1) Establish a part CAD model with a honeycomb porous structure with internal connectivity (see figure 1 ), which is processed by slicing software and saved as an STL file, and the data information of the STL file is imported into the SLS forming equipment;

[0046] (2) Take 300g Si 3 N 4 Add 15.79g, 33.33g, 52.94g, 75.00g, and 100.00g of epoxy resin E12 to the granulated powder, mix them evenly in a nylon tank, and rotate on the powder mixing rack for 24 hours to obtain E12 with a content of 5wt%, 10wt%. , 15wt%, 20wt%, 25wt% E12 / Si 3 N 4 Composite powder (see figure 2 , figure 2 Among them, A is ceramic powder, B is epoxy resin);

[0047] (3) Form the above composite powder on SLS equipment, the laser spot diameter is 0.15mm, the preheating temperature is 45°C, the powder layer thickness is 0.15mm, the scanning distance is 0.15mm, the laser power is 9W, and the scanning speed is 2000mm / s (formed biscuit such as image 3 As shown, the microscopic morphology...

Embodiment 2

[0051] (1) Establish a CAD model of the octahedron space topology, and save it as an STL file after being processed by the slicing software, and import the data information of the STL file into the SLS forming equipment;

[0052] (2) Take 300g of SiC granulation powder for each group and add 15.79g, 33.33g, 52.94g, 75.00g, 100.00g of epoxy resin E12 into a nylon tank and mix evenly, and rotate it on the powder mixing rack for 24 hours to obtain the content of E12 5wt%, 10wt%, 15wt%, 20wt%, 25wt% E12 / SiC composite powder;

[0053] (3) Form the above composite powder on SLS equipment, the laser spot diameter is 0.2mm, the preheating temperature is 45°C, the powder layer thickness is 0.2mm, the scanning distance is 0.2mm, the laser power is 5W, and the scanning speed is 1000mm / s;

[0054] (4) Place the biscuit in the debinding furnace, raise the temperature to 600°C at a rate of 1°C / min, keep it warm for 2 hours, and cool with the furnace;

[0055] (5) Place the degummed green...

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Abstract

The invention discloses a selective laser sintering based preparation method of a complex-structure porous ceramic. The method comprises the following steps: 1) designing a CAD model for the porous ceramic with a complex structure, slicing to store an STL file, importing data information of the STL file into SLS equipment; 2) using an initial ceramic powder and a binder to prepare a binder / ceramic composite powder, and controlling the micro porosity character of the porous ceramic by adjusting the varieties and the added amount of the binder; 3) presetting the parameters of an SLS forming process, and combining with the data information to form a biscuit; 4) discharging glue and sintering the biscuit formed in the step 3), so as to obtain the needed porous ceramic. The porous ceramic with any complex macroscopic pore structure and the unique micro porosity character is prepared, and the preparation method has the advantages that the process is simple and efficient, no mold is needed, and the production cost is low.

Description

technical field [0001] The invention belongs to the field of ceramic preparation, and more specifically relates to a method for preparing porous ceramics with complex structure based on laser selective sintering. Background technique [0002] Porous ceramic materials have the advantages of extremely high specific surface area, good chemical stability, high corrosion resistance, high hardness, wear resistance, high temperature resistance, non-toxic and harmless, etc., and are widely used as catalyst carriers, filter materials, thermal insulation materials, sound-absorbing materials, etc. With the development of science and technology, new application fields such as aerospace, military equipment, metal-ceramic composite materials, the demand for porous ceramic materials is more urgent, and higher requirements are put forward for its performance. [0003] The performance of porous ceramics mainly depends on its porosity, pore size and channel distribution. The traditional meth...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/584C04B35/565C04B35/195C04B35/64
CPCC04B35/195C04B35/565C04B35/584C04B35/64C04B38/0006C04B2235/665
Inventor 吴甲民刘梦月史玉升陈安南陈敬炎李晨辉张启富贺智勇千粉玲王晓波
Owner HUAZHONG UNIV OF SCI & TECH
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