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Three-dimensional freezing printing method of ceramic components

A component and ceramic technology, which is applied in the field of 3D cryoprinting of ceramic components, can solve problems such as difficult to overcome ice crystal expansion stress and low interlayer bonding strength, and achieve easy technology expansion and application, improve interlayer bonding strength, and reduce shrinkage. Effect

Active Publication Date: 2020-02-21
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problems that the existing 3D printing process of ceramic products has low interlayer bonding strength, and it is difficult to overcome the ice crystal expansion stress between layers during the freezing process to achieve high-strength interlayer bonding, the present invention provides a new interlayer printing method. 3D printing method

Method used

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  • Three-dimensional freezing printing method of ceramic components

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Firstly, the particle size is graded as 5% for powders smaller than 200nm, 10% for 200nm-1.0μm powders, 40% for 1-10μm powders, 30% for 10-30μm powders, and 30% for powders larger than 30μm Alumina ceramic powder with a solid content of 15% is dispersed into a silica sol with a solid content of 15%. After adding 0.2% polyethylene glycol and 0.5% polyvinyl alcohol, ball milling for 5 hours, a ceramic slurry with a solid content of 55% is obtained. For 3D cryoprinting. Then, the printing cavity was cooled down to minus 10°C by liquid nitrogen refrigeration. Subsequently, the prepared ceramic mud is extruded out of the nozzle by the motor, and the wet mud is adhered to the printing base plate to start printing. During the printing process, the wet mud forms successively superimposed layers of mud on the printing base, named respectively as the first layer of mud, the second layer of mud, and the third layer of mud,..., the first N layers of mud. The newly extruded mud w...

Embodiment 2

[0063]First, the particle size is graded as 3% for powders smaller than 200nm, 10% for 200nm-1.0μm powders, 40% for 1-10μm powders, 30% for 10-30μm powders, and 30% for powders larger than 30μm Alumina ceramic powder with a solid content of 20% is dispersed in a silica sol with a solid content of 17%. After adding 0.2% polyethylene glycol and 0.5% polyvinyl alcohol, ball milling for 5 hours, a ceramic slurry with a solid content of 60% is obtained. For 3D cryoprinting. Then, the printing cavity was cooled down to minus 10°C by liquid nitrogen refrigeration. Subsequently, the prepared ceramic mud is extruded out of the nozzle by the motor, and the wet mud is adhered to the printing base plate to start printing. During the printing process, the wet mud forms successively superimposed layers of mud on the printing base, named respectively as the first layer of mud, the second layer of mud, and the third layer of mud,..., the first N layers of mud. The newly extruded mud will f...

Embodiment 3

[0066] First, the particle size is graded as 3% for powders smaller than 200nm, 10% for 200nm-1.0μm powders, 40% for 1-10μm powders, 30% for 10-30μm powders, and 30% for powders larger than 30μm The silicon oxide ceramic powder with a solid content of 25% is dispersed into a silica sol with a solid content of 25%, and after adding 0.5% polyethylene glycol and 1% polyvinyl alcohol, ball milled for 8 hours to obtain a ceramic slurry with a solid content of 65%. For 3D cryoprinting. Then, the printing cavity was cooled down to minus 10°C by liquid nitrogen refrigeration. Subsequently, the prepared ceramic mud is extruded out of the nozzle by the motor, and the wet mud is adhered to the printing base plate to start printing. During the printing process, the wet mud forms successively superimposed layers of mud on the printing base, named respectively as the first layer of mud, the second layer of mud, and the third layer of mud,..., the first N layers of mud. The newly extruded...

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Abstract

The invention relates to a three-dimensional freezing printing method of ceramic components. The method comprises the following steps that (1) ceramic powder, silica sol, polyethylene glycol and polyvinyl alcohol are subjected to ball milling to obtain a ceramic slurry; (2) a printing cavity of a 3D printing device is cooled to minus 10 DEG C to minus 60 DEG C, and then the ceramic slurry is usedfor printing; the wet mud material extruded from nozzles is bonded to a printing base plate to form a first layer of mud material; printing is continuously conducted, the wet mud material extruded from the nozzles continuously form a second layer of mud material, a third layer of mud material.., and an Nth layer of mud material on the first layer of mud material; and the formed mud layers are gradually fused, and when printing is carried out to by 4-10 layers, the inner mud material layers and the interlayers are gradually frozen and solidified to obtain a green body; and (3) the green body isfreeze-dried and then heated and sintered to obtain the ceramic component. According to the printing method, the integrity of the printed ceramic can be realized, and the bonding strength between thelayers is improved.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a 3D freezing printing method of ceramic components. Background technique [0002] In recent years, 3D printing technology has developed rapidly, and a preliminary industrial chain has been formed in the preparation of organic and metal materials. Relatively speaking, the development of ceramic 3D printing technology is slow, and it is still in the printing application stage based on the existing printing technology. At present, the existing ceramic 3D printing technology has problems such as low product density, large sintering shrinkage, insufficient mechanical properties, and unfriendly environment in the preparation of ceramics. New ceramic 3D printing methods are urgently needed to be developed. [0003] The water-based ceramic slurry has no environmental pollution during the entire process of ceramic green body forming, drying, and sintering, and is a green ...

Claims

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Application Information

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IPC IPC(8): B28B1/00B33Y10/00B33Y70/00
CPCB28B1/001B33Y10/00B33Y70/00
Inventor 孙志强韩耀李淑琴张剑吕毅张昊张天翔
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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