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Ceramic initial blank forming method based on microwave in-situ sintering and product

A ceramic and in-situ technology, applied in the field of additive manufacturing, can solve the problems of low strength of the blank, easy to block the ink path and corrode the nozzle, etc., and achieve the effect of increasing the SiC content, reducing the amount of residual carbon and silicon, and improving the strength

Pending Publication Date: 2021-07-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above defects or improvement needs of the prior art, the present invention provides a ceramic preform forming method and product based on microwave in-situ sintering. On the basis of the existing three-dimensional jet printing technology, an inorganic microwave absorber is prepared to replace the traditional organic adhesive. binder, adjust the resistivity of silicon carbide ceramics, improve its dielectric properties so that it can absorb microwaves, and solve the problems that organic binders are easy to block the ink path and corrode the nozzle, and the strength of the green body is low. Subsequent curing and degreasing heat treatment process simplifies the manufacturing process

Method used

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  • Ceramic initial blank forming method based on microwave in-situ sintering and product
  • Ceramic initial blank forming method based on microwave in-situ sintering and product
  • Ceramic initial blank forming method based on microwave in-situ sintering and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A method for forming silicon carbide ceramics based on microwave sintering and three-dimensional spray printing, comprising the following steps:

[0057] S1 To prepare a microwave absorber, take 75wt% deionized water, use a balance to take 25wt% iron nitrate powder, and take 0.5wt% glycerin.

[0058] Dissolve ferric nitrate powder and glycerin in deionized water, stir evenly to make it fully diffuse, measure the viscosity of the solution with a rotary gauge, measure the surface tension of the solution with a surface tension meter, and measure the acidity and alkalinity with a pH meter.

[0059] Add 0-0.5wt% acetic acid dropwise to adjust the pH of the microwave absorber;

[0060] The final solution binder has a viscosity of 1.3 mPa·s, a pH of 7.1, and a surface tension of 21 mN / m.

[0061] S2 is configured with silicon carbide powder particles, and α-SiC powders with a particle size of 50 μm and 10 μm are selected.

[0062] Measure with a graduated cylinder, mix 80vol...

Embodiment 2

[0065] A method for forming silicon carbide ceramics based on microwave sintering and three-dimensional spray printing, comprising the following steps:

[0066] S1 To prepare a microwave absorber, select 65wt% deionized water, use a balance to measure aluminum chloride powder with a mass fraction of 33.5wt%, and measure 1wt% glycerin.

[0067] Dissolve aluminum chloride powder and glycerin in deionized water, stir evenly to make it fully diffuse, measure the viscosity of the solution with a rotary gauge, measure the surface tension of the solution with a surface tension meter, and measure the acidity and alkalinity with a pH meter.

[0068] Add 0-0.5wt% acetic acid dropwise to adjust the pH of the microwave absorber;

[0069] The final solution binder has a viscosity of 1.65 mPa·s, a pH of 7.0, and a surface tension of 29 mN / m.

[0070] S2 is configured with silicon carbide powder particles, and α-SiC powders with a particle size of 50 μm and 10 μm are selected.

[0071] Mea...

Embodiment 3

[0074] A method for forming silicon carbide ceramics based on microwave sintering and three-dimensional spray printing, comprising the following steps:

[0075] S1 To prepare a microwave absorber, select 60wt% deionized water, use a balance to measure 38.5wt% aluminum chloride powder and 1.4wt% furfuryl alcohol.

[0076] Dissolve aluminum chloride powder and glycerin in deionized water, stir evenly to make it fully diffuse, measure the viscosity of the solution with a rotary gauge, measure the surface tension of the solution with a surface tension meter, and measure the acidity and alkalinity with a pH meter.

[0077] Add 0-0.1wt% acetic acid dropwise to adjust the pH of the microwave absorber;

[0078] The final solution binder has a viscosity of 1.83 mPa·s, a pH of 7.0, and a surface tension of 20 mN / m.

[0079] S2 is configured with silicon carbide powder particles, and α-SiC powders with a particle size of 50 μm and 10 μm are selected.

[0080] Measure with a measuring c...

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Abstract

The invention belongs to the related technical field of additive manufacturing, and discloses a ceramic initial blank forming method based on microwave in-situ sintering and a product. The method comprises the following steps that a microwave absorbent and SiC powder are prepared; and the SiC powder is used for three-dimensional jet printing, in the three-dimensional jet printing process, after a slice layer is formed through jet printing, the microwave absorbent is sprayed to the surface of the slice layer, and then the slice layer is subjected to microwave heating, so that the slice layer is subjected to in-situ heating sintering forming, each slice layer is formed layer by layer, and a required ceramic initial blank is obtained. The invention also discloses a product prepared by the method. By means of the method, the problems that an organic binder is prone to blocking an ink path and corroding a spray head, and the initial blank is low in strength are solved, subsequent curing and degreasing heat treatment procedures are omitted through in-situ sintering forming, and the manufacturing process is simplified.

Description

technical field [0001] The invention belongs to the technical field related to additive manufacturing, and more specifically relates to a method and product for forming a ceramic preform based on microwave in-situ sintering. Background technique [0002] Three-Dimension Printing (Three-Dimension Printing, 3DP), also known as binder jetting technology, is a kind of additive manufacturing technology. It mainly uses nozzles to selectively spray liquid binders to form discrete powders layer by layer. In this way, the required parts can be obtained, which can be applied to the preparation of complex parts such as ceramics, plastics, and metals. Compared with the traditional process, it has many advantages such as fast forming speed, no need for molds, not affected by the geometric complexity of parts, and recyclable materials. However, the existing 3D inkjet printing technology still has the following shortcomings or problems when forming ceramic parts: [0003] 1. The organic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/577C04B35/64C04B35/63B28B1/00B33Y10/00B33Y70/10
CPCC04B35/565C04B35/64C04B35/6303C04B35/6306B28B1/001B33Y10/00B33Y70/10C04B2235/5436C04B2235/667C04B2235/3272C04B2235/3217C04B2235/96
Inventor 魏青松冯琨皓毛贻桅
Owner HUAZHONG UNIV OF SCI & TECH
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