A Binderless Laser Selective Melting/Sintering Forming Method of Ceramic Slurry

A laser selective melting and ceramic slurry technology, which is applied in the field of binderless ceramic slurry SLM/SLS forming, can solve the problems of cumbersome steps, low density of the preset powder layer, and difficulty in laying powder, and achieves adhesion. Strong, the effect of solving the difficulty of powder spreading and increasing the contact area

Active Publication Date: 2020-02-07
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are problems such as difficulty in powder spreading and low density of preset powder layer in powder forming ceramic parts
However, when using ceramic slurry with a binder to form ceramic parts, complex post-processing such as degreasing is required, and the steps are cumbersome

Method used

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  • A Binderless Laser Selective Melting/Sintering Forming Method of Ceramic Slurry
  • A Binderless Laser Selective Melting/Sintering Forming Method of Ceramic Slurry
  • A Binderless Laser Selective Melting/Sintering Forming Method of Ceramic Slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh Al with an average particle size of 0.62 μm according to the mass ratio of 1:1 2 o 3 and pure distilled water, using an electromagnetic stirring bar to stir for 10 minutes to prepare a ceramic slurry; then use the ceramic slurry to pre-preset a layer of 50 μm thick slurry powder layer on the ceramic substrate; use an induction heating system to preheat the preset slurry powder layer to 110°C, keep the temperature for 2 minutes until the moisture in the pre-set slurry layer is evaporated by 80% to 95%, such as figure 1 As shown, the powder layer is smooth and has a certain viscosity, which can withstand the impact of laser energy and is not easy to splash. figure 2 Shown is figure 1 The high-magnification picture of the scanning electron microscope of the preset slurry layer in the medium shows that the surface of the preset powder layer has no voids and is very dense; then the layer is scanned and printed with a laser according to the three-dimensional data; th...

Embodiment 2

[0026] Weigh Al with an average particle size of 2 μm according to the mass ratio of 7:32 o 3 and pure distilled water, using an electromagnetic stirring bar to stir for 10 minutes to prepare a ceramic slurry; then use the ceramic slurry to pre-preset a layer of 50 μm thick slurry powder layer on the ceramic substrate; use an induction heating system to preheat the preset slurry powder layer to 110°C, keep the temperature for 2 minutes until the moisture in the pre-set slurry layer is evaporated by 80% to 95%; then use the laser to scan and print the layer according to the three-dimensional data; the layer after scanning and printing is cooled to about 50-130°C; repeat from The process of pre-powder layer to printing is repeated multiple times to obtain the final ceramic shaped part.

[0027] The average micro-Vickers hardness of the ceramic parts prepared by the SLM forming process of the ceramic slurry prepared under this process is about 1550 MPa, and the relative density i...

Embodiment 3

[0029] Weigh Al with an average particle size of 0.62 μm according to the mass ratio of 80%: 20% 2 o 3 and ZrO 2 Ceramic powder, then weigh pure distilled water according to the mass ratio of powder to pure distilled water as 1:1; mix it in a glass container and use an electromagnetic stirring rod to stir for 10min to prepare a ceramic slurry; then use the ceramic slurry on a ceramic substrate Pre-set a layer of 30 μm thick slurry powder layer; use an induction heating system to preheat the preset slurry powder layer to 110°C, and keep the temperature for 2 minutes until the moisture in the preset slurry layer is evaporated by 80% to 95%; then according to The three-dimensional data is scanned and printed with a laser; the scanned and printed layer is cooled to about 50-130°C; the process from pre-powder layer to printing is repeated several times to obtain the final ceramic shaped part.

[0030] The average micro-Vickers hardness of the ceramic parts prepared by the SLM for...

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Abstract

The invention discloses a binderless SLM / SLS method for ceramic slurry. The method comprises the following steps: mixing ceramic powder with water in proportion to obtain suspension slurry; then presetting a slurry layer with a thickness of 30 [mu]m to 150 [mu]m on the surface of a forming substrate, and carrying out heating to evaporate and remove most of the water; scanning a powder layer, in which a part of the water is removed, with a continuous fiber laser by using SLM / SLS technology according to slice layer data; and repeating steps from presetting of the powder layer to printing a plurality of times so as to prepare a formed ceramic layer through lamination. Compared with powder, the evaporated ceramic slurry has higher original density and is more uniform in powder distribution. Atthe same time, the preset slurry powder layers are not prone to spattering under the impact of laser due to the effect of residual water. The binderless SLM / SLS method for ceramic slurry in the invention can prepare a ceramic part with a relative density of 93% or more and a Vickers hardness of 1500 MPa or more.

Description

technical field [0001] The invention belongs to the technical field of selective laser melting / sintering (Selective Laser Melting / Selective Laser Sintering, SLM / SLS) forming, and relates to a binder-free ceramic slurry SLM / SLS forming method. Background technique [0002] Ceramic materials have the advantages of high strength, high hardness, corrosion resistance, wear resistance, high temperature resistance, good heat insulation, etc., and show increasingly broad application prospects in the fields of energy, mechatronics, aerospace, computers, and bioengineering. However, the difficulty in processing complex ceramic parts has always been a major difficulty restricting the application of ceramics. [0003] Most of the existing ceramic parts are formed by hot pressing and sintering. Hot pressing sintering is to apply a certain external force at the same time during the sintering process (the general pressure is between 10 and 40Mpa, depending on the strength that the materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/64C04B35/626C04B35/10
CPCC04B35/10C04B35/622C04B35/6264C04B35/64C04B2235/3244C04B2235/665C04B2235/77C04B2235/96
Inventor 刘婷婷张凯张长东闫以帅廖文和杜道中
Owner NANJING UNIV OF SCI & TECH
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