A degreasing sintering method based on nanoparticle additive manufacturing of shaped parts

A nanoparticle and additive manufacturing technology, applied in the field of additive manufacturing materials, can solve the problems that the chemical degreasing process cannot be applied to nanoparticles and nanoparticle embryo defects, and achieve the effects of cost saving, carbon neutrality and simple process

Active Publication Date: 2022-06-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Secondly, thermal degreasing with a higher degreasing rate is easy to cause defects in the formation of nanoparticle embryos.
Chemical degreasing process cannot be applied to nanoparticles due to easy introduction of impurities
And there is no degreasing and sintering process for manufacturing shaped parts based on nanoparticle PEP in relevant literature and patents

Method used

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  • A degreasing sintering method based on nanoparticle additive manufacturing of shaped parts
  • A degreasing sintering method based on nanoparticle additive manufacturing of shaped parts
  • A degreasing sintering method based on nanoparticle additive manufacturing of shaped parts

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Embodiment 1

[0035]This embodiment provides a degreasing and sintering method based on nanoparticle additive manufacturing of formed parts, using tungsten-based alloy nanoparticles as the original material, and using powder extrusion printing technology to prepare tungsten-based alloy blanks. The prepared embryo is cylindrical. The process parameters of the powder extrusion printing technology are the scanning line spacing of 50 μm and the layer thickness of 20 μm. 0.5 g of sodium citrate was dissolved in 1 L of distilled water to form a solution and heated to 40°C. The tungsten-based alloy blanks were then placed in a sodium citrate solution at 40°C and stirred. The whole degreasing time was 4h, during which the solution was replaced with a new solution at 40°C every 1h. After the degreasing, the degreasing embryos were placed in an atmosphere furnace, the sintering atmosphere was hydrogen, the heating rate was kept at 3K / min, and the temperature was raised to 1400 °C for 1 h to complet...

Embodiment 2

[0037] This embodiment provides a degreasing and sintering method based on nanoparticle additive manufacturing of formed parts, using tungsten-based alloy nanoparticles as the original material, and using powder extrusion printing technology to prepare tungsten-based alloy blanks. The process parameters of the powder extrusion printing technology are the scanning line spacing of 1000 μm and the layer thickness of 100 μm. The prepared prime embryo is a cuboid with a linear pattern on the surface. 20 g of sodium citrate was dissolved in 2 L of distilled water to form a solution and heated to 70°C. The tungsten-based alloy blanks were then placed in a sodium citrate solution at 70°C and stirred. The whole degreasing time was 36h, during which the solution was replaced with a new solution at 70°C every 3h. After the degreasing, the degreasing embryos were placed in an atmosphere furnace, and the atmosphere was a mixture of hydrogen and argon. The microstructure of the sintered ...

Embodiment 3

[0039] This embodiment provides a degreasing and sintering method based on nanoparticle additive manufacturing of formed parts, using tungsten-based alloy nanoparticles as the original material, and using powder extrusion printing technology to prepare tungsten-based alloy blanks. The process parameters of the powder extrusion printing technology are the scanning line spacing of 100 μm and the layer thickness of 30 μm. The prepared prime embryo is a cuboid with a linear pattern on the surface. 90 g of sodium citrate was dissolved in 3 L of distilled water to form a solution and heated to 90°C. The tungsten-based alloy blanks were then placed in a sodium citrate solution at 90°C and stirred. The whole degreasing time was 48h, during which the solution was replaced with a new solution at 90°C every 2h. After the degreasing, the degreasing embryos were placed in an atmosphere furnace, the sintering atmosphere was hydrogen, the heating rate was kept at 10 K / min, and the temperat...

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Abstract

The present invention provides a degreasing and sintering method for manufacturing formed parts based on nanoparticle additives. In step S1, tungsten-based alloy nanoparticles are used as raw materials to prepare alloy blanks by powder extrusion printing technology; in step S2, the alloy blanks are Place it in a mixed solution of sodium citrate and distilled water at 40-90°C for 4h-48h to complete the degreasing, during which the isothermal solution is constantly stirred and replaced; then the degreased sample is cleaned and dried; step S3, the degreased and The dried sample is placed in an atmosphere furnace, the atmosphere is hydrogen or a mixed atmosphere containing hydrogen, the temperature is raised to 1400-2300°C at a heating rate of 3K / min-10K / min, and the temperature is kept for 1h-6h to complete sintering to prepare alloy parts. The invention can ensure the complete degreasing of samples, and prepare full-dense alloy parts without defects and whose shape can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing materials, and particularly relates to a degreasing and sintering method based on nano-particle additive manufacturing of shaped parts. Background technique [0002] Powder extrusion printing (PEP) has attracted a lot of attention as an additive manufacturing technology with the advantages of producing complex geometries and high-performance shaped parts. Powder extrusion printing technology is to heat mixed metal powder and polymer binder into a molten fluid slurry and deposit the molten fluid slurry on the substrate until the molten slurry is completely solidified to form the first layer, by repeating the process layer by layer To produce a green body, the layers are joined together by slurry. The printed green body then needs to be degreased and sintered to form alloy parts with the desired structure and high performance. [0003] At present, for PEP technology, micron-scale me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F10/10B22F10/50B33Y10/00B22F3/10B33Y40/00
CPCB22F10/10B22F10/50B22F3/1021B22F3/1007B33Y10/00B33Y40/00Y02P10/25
Inventor 马宗青胡章平王姿曈
Owner TIANJIN UNIV
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