Ceramic part 3D (three dimensional) printing method based on adhesives of dual curing systems

A ceramic parts, dual-curing technology, applied in the field of additive manufacturing, can solve the problems of high surface tension, low forming efficiency, reducing forming accuracy, etc., and achieve the effect of improving dimensional accuracy, small shrinkage deformation, and small surface tension

Inactive Publication Date: 2017-08-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. At present, the ceramic powder adhesive is mainly a single-component volatile adhesive. It takes a long time for the volatile adhesive to be sprayed on the powder surface to dry, and the solidification and bonding can only occur after the solvent is completely evaporated. The molding efficiency Low, and at the same time, during the drying and curing process, the binder will interact with the non-selected powder due to the long time required, which reduces the forming accuracy
Secondly, during the printing process, the volatile adhesive will volatilize at the nozzle, causing the adhesive to solidify and block the nozzle;
[0006] 2. Ordinary adhesives usually contain water and cannot be used to bond and form water-soluble ceramic powders, such as calcium oxide, magnesium oxide, aluminum nitride and other ceramic powders that are prone to hydrolysis;
[0007] 3. Ordinary adhesives, especially water-based adhesives, have high surface tension, which will cause large deformation, shrinkage or warping during the curing and drying process of ceramic green bodies, thus affecting the quality of ceramic parts. Shape accuracy

Method used

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  • Ceramic part 3D (three dimensional) printing method based on adhesives of dual curing systems
  • Ceramic part 3D (three dimensional) printing method based on adhesives of dual curing systems

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of Al based photocurable adhesive provided by the invention 2 O 3 The 3D printing method of ceramic parts, the details are as follows:

[0038] 1) 85% mass fraction of photosensitive resin is used as the adhesive matrix material, 10% mass fraction of ethanol modifier is added to modify the adhesive, and 3% mass fraction of photoinitiator is added to improve the optical properties of the adhesive. Curing rate, add 2% mass fraction of colorant to color the adhesive, and prepare the photosensitive resin-based adhesive of the first heavy curing system;

[0039] 2) Using 90% mass fraction of epoxy resin as the adhesive matrix material, adding 10% mass fraction of ethylene glycol modifier to modify the adhesive, as the first component of two-component curing, using poly Thiol (low temperature fast curing agent for epoxy resin), as the second component of two-component curing, constitutes the second heavy curing system;

[0040] 3) after mixing the photosensitive res...

Embodiment 2

[0048] The invention provides a 3D printing method for CaO-MgO composite ceramic parts based on a light-curing adhesive, the specific contents are as follows:

[0049] 1) 85% mass fraction of photosensitive resin is used as the adhesive matrix material, 10% mass fraction of ethanol modifier is added to modify the adhesive, and 3% mass fraction of photoinitiator is added to improve the optical properties of the adhesive. Curing rate, add 2% mass fraction of colorant to color the adhesive, and prepare the photosensitive resin-based adhesive of the first heavy curing system;

[0050] 2) Using 90% mass fraction of epoxy resin as the adhesive matrix material, adding 10% mass fraction of ethylene glycol modifier to modify the adhesive, as the first component of two-component curing, using poly Thiol (low temperature fast curing agent for epoxy resin), as the second component of two-component curing, constitutes the second heavy curing system;

[0051] 3) after mixing the photosensi...

Embodiment 3

[0059] The present invention provides a 3D printing method for SiC composite ceramic parts based on a light-curing adhesive, the details of which are as follows:

[0060] 1) 85% mass fraction of photosensitive resin is used as the adhesive matrix material, 10% mass fraction of ethanol modifier is added to modify the adhesive, and 3% mass fraction of photoinitiator is added to improve the optical properties of the adhesive. Curing rate, add 2% mass fraction of colorant to color the adhesive, and prepare the photosensitive resin-based adhesive of the first heavy curing system;

[0061] 2) Using 90% mass fraction of epoxy resin as the adhesive matrix material, adding 10% mass fraction of ethylene glycol modifier to modify the adhesive, as the first component of two-component curing, using poly Thiol (low temperature fast curing agent for epoxy resin), as the second component of two-component curing, constitutes the second heavy curing system;

[0062] 3) after mixing the photose...

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Abstract

The invention discloses a ceramic part 3D (three dimensional) printing method based on a photocuring adhesive. In a first curing system, a photosensitive resin-based adhesive solidifies quickly under the irradiation of ultraviolet light, bonds powder so as to take shape and has high curing efficiency; only when the photosensitive resin-based adhesive encounters the ultraviolet light, the photosensitive resin-based adhesive solidifies; and as the photosensitive resin-based adhesive is not likely to encounter the ultraviolet light in a spray nozzle, the photosensitive resin-based adhesive is not likely to solidify and block the printing spray nozzle. In a second curing system, an epoxy resin-based adhesive can also solidify quickly by adding polymercaptan serving as a solidification triggering agent; and as the epoxy resin and the polymercaptan triggering agent are in different spray nozzles and do not contact with each other, the epoxy resin-based adhesive is not likely to solidify and block the spray nozzle. As the adhesives of the dual curing systems are resin-based adhesives and no water is added all the time in the preparation process, the adhesives of the dual curing systems can be used for bonding water-solubility ceramic powder; and the green bodies of ceramic parts formed by the dual curing systems have very high strength and forming accuracy.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a 3D printing method for ceramic parts based on a dual curing system adhesive. Background technique [0002] Ceramic powder 3D printing (3DP) is a new type of ceramic parts forming method. It has two characteristics of "adhesive injection" and "powder bed". powder to form a thin layer of cross-section. After the scanning and spraying of one layer is completed, the worktable is lowered by one layer, and a new layer of ceramic powder is re-applied, and the adhesive continues to be selectively sprayed to form a thin layer of cross-section. At the same time, the thin layer will also be bonded to the formed part, so that the formed part can be stacked layer by layer. After the parts are formed, some post-processing processes, such as degreasing, densification, and high-temperature enhanced sintering, are used to finally obtain high-strength and densified ceramic part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/10C04B35/057C04B35/565C04B35/632C04B35/634C04B35/638C04B35/645B33Y40/00
CPCC04B35/803C04B35/057C04B35/10C04B35/565C04B35/632C04B35/634C04B35/63452C04B35/638C04B35/6455B33Y40/00C04B2235/6567C04B2235/6562C04B2235/614C04B2235/6026C04B2235/3418C04B2235/3246C04B2235/3206
Inventor 鲁中良杨强李涤尘万伟舰
Owner XI AN JIAOTONG UNIV
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