Molten 3D direct-writing printing slurry as well as preparation method and application thereof

A molten state, 3D technology, applied in the field of 3D printing materials, can solve problems such as difficult control of slurry rheological properties, achieve the effects of avoiding a large number of cracks, simple preparation method, and improving brittleness

Active Publication Date: 2020-09-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In previous reports, the designed slurries are often in the form of solutions or suspensions, and the rheological properties of such slurries are often very sensitive to the concentration of solutes, especially solvents with strong volatile properties. The rheological properties of the material are difficult to control

Method used

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  • Molten 3D direct-writing printing slurry as well as preparation method and application thereof
  • Molten 3D direct-writing printing slurry as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Using polycarbosilane / polypropylene powder as slurry and air as crosslinking gas, a three-dimensional ceramic structure was prepared.

[0038] Put 6g of polycarbosilane, 0.3g of polypropylene, and 1000ml of xylene into a beaker, and stir magnetically in an oil bath at 120°C for 6h. Then the clear and transparent solution was transferred to a vacuum drying oven, the temperature was set at 120°C, the pressure was -0.1MPa, and vacuum-dried for 24 hours to obtain uniformly blended polycarbosilane / polypropylene particles, the powder was ground and sieved to obtain straight Write with slurry. The screen mesh is 100 mesh.

[0039] Put 5g of polycarbosilane / polypropylene powder into a stainless steel syringe, install a 200μm aperture needle on the top of the syringe, install a heating jacket outside the syringe, assemble the piston and air guide tube, and inject 99.999% high-purity gas into the syringe. Nitrogen, the pressure is set to 60psi, keep 10min, remove the air in the...

Embodiment 2

[0047] Using polycarbosilane / polypropylene powder as slurry and air as crosslinking gas, a three-dimensional ceramic structure was prepared.

[0048] Put 4g of polycarbosilane, 0.12g of polypropylene, and 50ml of xylene into a beaker, and stir magnetically in an oil bath at 120°C for 4h. Then the clear and transparent solution was transferred to a vacuum drying oven, the temperature was set at 120°C, the pressure was -0.1MPa, and vacuum-dried for 12 hours to obtain uniformly blended polycarbosilane / polypropylene particles, the powder was ground and sieved to obtain a direct Write with slurry. The screen mesh is 100 mesh.

[0049] Put 2g of polycarbosilane / polypropylene powder into a stainless steel syringe, install a 200μm aperture needle on the top of the syringe, install a heating jacket outside the syringe, assemble the piston and air guide tube, and inject 99.999% high-purity into the syringe. Nitrogen, the pressure is set to 50psi, keep 10min, remove the air in the syri...

Embodiment 3

[0057] Using polycarbosilane / polypropylene powder as slurry and air as crosslinking gas, a three-dimensional ceramic structure was prepared.

[0058] Put 4g of polycarbosilane, 0.04g of polypropylene, and 50ml of xylene into a beaker, and stir magnetically in an oil bath at 120°C for 4h. Then the clear and transparent solution was transferred to a vacuum drying oven, the temperature was set at 120°C, the pressure was -0.1MPa, and vacuum-dried for 12 hours to obtain uniformly blended polycarbosilane / polypropylene particles, the powder was ground and sieved to obtain a direct Write with slurry. The screen mesh is 100 mesh.

[0059] Put 2g of polycarbosilane / polypropylene powder into a stainless steel syringe, install a 400μm aperture needle on the top of the syringe, install a heating jacket on the outside of the syringe, assemble the piston and air guide tube, and inject 99.999% high-purity into the syringe. Nitrogen, the pressure is set to 50psi, keep 10min, remove the air i...

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Abstract

The invention discloses molten-state 3D direct-writing printing slurry as well as a preparation method and application thereof, the molten-state 3D direct-writing printing slurry is a molten-state substance obtained by modifying a ceramic precursor with a modifier and then heating the obtained modified ceramic precursor powder to 250-300 DEG C, wherein the ceramic precursor is polycarbosilane, andthe modifier is selected from at least one of polypropylene, hyperbranched liquid polycarbosilane, liquid polyvinyl silane and polydimethylsiloxane. The invention, for the first time, provides the 3Ddirect-writing printing slurry in a molten state, wherein the 3D direct-writing printing slurry is completely solvent-free, and the rheological property of the slurry can be simply controlled by controlling the temperature. Compared with solutions and suspension slurry, the ceramic structure prepared from the molten 3D direct-writing printing slurry is very smooth in surface and hardly has defects inside, the process that a solvent needs to be removed from a printed green body is removed, and the adverse effect of the solvent on the green body is overcome.

Description

technical field [0001] The invention belongs to the technical field of 3D printing materials, and in particular relates to a molten 3D direct writing slurry and its preparation method and application. Background technique [0002] 3D printing technology is to digitally slice the three-dimensional model into two-dimensional cross-sections, and add and manufacture parts point by point, line, and surface, so that structures that are difficult or impossible to process by traditional techniques can be realized. Among them, direct writing molding technology, as a cheap 3D printing technology, was first proposed by Joseph Cesarano III of Sandia National Laboratory in the United States. This method can achieve a large aspect ratio and size control range, and enables the realization of 3D structures with unsupported features. The ink raw material composition used in its printing has a high degree of freedom in design, and can realize the three-dimensional shaping of metals, ceramics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/571C04B35/622B33Y10/00B33Y70/00C04B35/634B28B1/00
CPCB28B1/001B33Y10/00B33Y70/00C04B35/571C04B35/622C04B35/634C04B35/63404C04B35/63408C04B35/63448C04B2235/483C04B2235/6026
Inventor 张斗王小峰赵连仲熊慧文
Owner CENT SOUTH UNIV
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