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Silicon carbide ceramic paste for photocuring and preparation method thereof

A silicon carbide ceramic and light curing technology, applied in the direction of additive processing, can solve problems such as unfavorable sintering and reduce the solid content of paste, and achieve the effect of improving printing efficiency, increasing curing depth and increasing solid content.

Inactive Publication Date: 2019-11-15
NAT INST CORP OF ADDITIVE MFG XIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickness of the coating layer is 30nm; the resin is selected from one or more of paraffin wax, polyacrylic resin, epoxy resin, alkyd resin, polyvinyl chloride and synthetic fatty acid; the patent is a particle surface The modification method does not involve the preparation of paste, and the surface of ceramic powder is coated with resin, which will reduce the solid content of subsequent paste, which is not conducive to subsequent sintering and improve the density and performance of ceramics

Method used

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  • Silicon carbide ceramic paste for photocuring and preparation method thereof
  • Silicon carbide ceramic paste for photocuring and preparation method thereof
  • Silicon carbide ceramic paste for photocuring and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Step 1: Coating a layer of SiO on the surface of spherical SiC powder with d50=0.4um and spherical SiC powder with d50=2.5um by CVD method 2 , SiO 2 The thickness of the layer is 8 nm.

[0054] Step 2, put the two coated powders into the ball mill, wherein the SiC powder with d50=0.4um accounts for 20% by mass, the balance is SiC powder with d50=2.5um, and the added SiC powder is 1% by mass The stearic acid was ball milled for 12 hours at a ball milling speed of 360 r / min, and SiC mixed powder was formed after ball milling.

[0055] Step 3, weighing 100g of SiC mixed powder, 1g of dispersant, 34.69g of monomer, 3g of compatibilizer and 0.69g of photoinitiator respectively, wherein the SiC mixed powder is sieved through a 100 mesh screen after drying; the content of compatibilizer is SiC mixed powder 3wt%, dispersant content is 1wt% of SiC mixed powder, monomer content is 34.69wt% of SiC mixed powder, photoinitiator content is 2wt% of monomer mass; Compatibilizer is st...

Embodiment 2

[0063] Step 1: Coating a layer of SiO on the surface of spherical SiC powder with d50=0.4um and spherical SiC powder with d50=2.5um by CVD method 2 , SiO 2 The thickness of the layer is 8 nm.

[0064] Step 2, put the coated two powders into the ball mill, where the mass of SiC powder with d50=0.4um accounts for 30%, the balance is SiC powder with d50=2.5um, and the mass of SiC powder added is 1% The stearic acid was ball milled for 12 hours at a ball milling speed of 360 r / min, and SiC mixed powder was formed after ball milling.

[0065] Step 3, weigh 100g of SiC mixed powder, 0.7g of dispersant, 23.1g of monomer, 2.5g of compatibilizer and 0.46g of photoinitiator, wherein the SiC mixed powder is sieved through a 100 mesh screen after drying; The content is 2.5wt% of the SiC mixed powder, the dispersant content is 0.7wt% of the SiC mixed powder, the monomer content is 23.1wt% of the SiC mixed powder, and the photoinitiator content is 2wt% of the monomer mass; the compatibili...

Embodiment 3

[0069] Step 1: Coating a layer of SiO on the surface of spherical SiC powder with d50=0.4um and spherical SiC powder with d50=2.5um by CVD method 2 , SiO 2 The thickness of the layer is 10 nm.

[0070] Step 2, put the two coated powders into the ball mill, wherein the SiC powder with d50=0.4um accounts for 40% of the mass, and the balance is SiC powder with d50=2.5um, and the added SiC powder is 1% by mass The stearic acid was ball milled for 12 hours at a ball milling speed of 360 r / min, and SiC mixed powder was formed after ball milling.

[0071] Step 3, weigh 100g of SiC mixed powder, 0.6g of dispersant, 30g of monomer, 1.5g of compatibilizer and 0.66g of photoinitiator, wherein the SiC mixed powder is sieved through a 100 mesh screen after drying; the content of compatibilizer SiC mixed powder 1.5wt%, dispersant content is 0.6wt% of SiC mixed powder, monomer content is 30wt% of SiC mixed powder, photoinitiator content is 2.2wt% of monomer mass; compatibilizer is stearin ...

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Abstract

The invention discloses silicon carbide ceramic paste for photocuring and a preparation method thereof. The paste is prepared by mixing SiC mixed powder, a dispersing agent, a monomer, a compatilizerand a photoinitiator, wherein the surface of the SiC mixed powder is coated with a SiO2 layer, so that the refractive index difference between the final paste and light-cured resin is reduced, and then printing efficiency is further improved. SiO2 can improve the solid phase content of the whole slurry, so that the sintering density of sintered ceramic and the mechanical property of finally formedceramic can be improved during subsequent ceramic sintering. Through addition of the dispersing agent into the slurry, the agglomeration phenomenon of the slurry can be reduced, the dispersity is improved, and the solid phase content of the whole slurry can be increased. Verification finds that the solid phase content in the paste can finally reach 40%-60%.

Description

【Technical field】 [0001] The invention belongs to the technical field of silicon carbide (SiC) paste preparation, and in particular relates to a silicon carbide ceramic paste for photocuring and a preparation method thereof. 【Background technique】 [0002] Stereolithography (SLA) is currently the main technology for ceramic 3D printing on the market, and it is also a relatively successful technology for commercialization. This technology uses a light-curable adhesive mixed with ceramic powder, photoinitiator, dispersant, etc., and the ultraviolet light source scans the cured resin layer by layer according to a certain scanning path until the printing is completed. The technical characteristics of SLA stereolithography molding ceramics are: not only the cost is greatly reduced, but also the performance is stable, and it has the characteristics of high density of sterile ceramic products. Silicon carbide ceramics have excellent properties such as strong oxidation resistance, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/577C04B35/634C04B35/628C04B35/626B33Y70/00
CPCC04B35/565C04B35/63424C04B35/62807C04B35/62884C04B35/62605B33Y70/00C04B2235/5445C04B2235/5436
Inventor 王克杰鲍崇高宋索成许海嫚卢秉恒赵纪元
Owner NAT INST CORP OF ADDITIVE MFG XIAN
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