Phenolic resin coated ceramic powder for laser 3D printing and preparation method thereof

A technology of ceramic powder and phenolic resin, which is applied in the field of laser 3D printing powder material preparation, can solve the problems of lack of preparation methods, high cost, and few types of organic binders, and achieves good dissolution effect, high absorption rate and volatile. Effect

Inactive Publication Date: 2016-06-15
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the film-coated ceramic powders currently suitable for SLS forming have disa...

Method used

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  • Phenolic resin coated ceramic powder for laser 3D printing and preparation method thereof
  • Phenolic resin coated ceramic powder for laser 3D printing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A phenolic resin coated silicon carbide ceramic powder includes 20-30wt% phenolic resin, 1.5-2.5wt% urotropine, 1-1.5wt% stearic acid, and the balance is surface-modified silicon carbide. The preparation process and principle of the phenolic resin coated silicon carbide ceramic powder are as follows Figure 1-2 As shown, it specifically includes the following steps:

[0032] (1) Preparation of surface-modified silicon carbide ceramic powder: Take 1000g of silicon carbide ceramic powder, wash them with dilute hydrochloric acid, dilute sodium hydroxide and water, and put them in a vacuum drying oven for drying. Then, a mixture of 30 g of absolute ethanol and 10 g of vinyl silane is uniformly mixed with the aforementioned silicon carbide ceramic powder, and at the same time, a stirring device is used to fully stir the mixture for surface modification treatment. After the reaction is completed, the mixture is vacuum dried and sieved to obtain surface-modified silicon carbide ...

Embodiment 2

[0036] A phenolic resin coated titanium carbide ceramic powder includes 15-25wt% phenolic resin, 1-2wt% urotropine, 0.5-1wt% stearic acid, and the balance is surface-modified titanium carbide. The preparation method of the phenolic resin coated titanium carbide ceramic powder is as follows:

[0037] (1) Preparation of surface-modified titanium carbide ceramic powder: Take 1000g of titanium carbide ceramic powder, wash them with dilute sulfuric acid, dilute sodium carbonate and water, and put them in a vacuum drying oven for drying. Then, a mixture of 60 g of absolute ethanol and 15 g of aminosilane is uniformly mixed with the aforementioned titanium carbide ceramic powder, and at the same time, a stirring device is used to fully stir the mixture for surface modification treatment. After the reaction is completed, the mixture is vacuum dried and sieved to obtain surface-modified titanium carbide ceramic powder with a particle size of 30 microns.

[0038] (2) Preparation of phenolic...

Embodiment 3

[0041] A phenolic resin coated zirconia ceramic powder includes 10-20wt% phenolic resin, 1-2wt% urotropine, 0.5-1wt% stearic acid, and the balance is surface-modified zirconia. The preparation method of the phenolic resin coated zirconia ceramic powder is as follows:

[0042] (1) Preparation of surface-modified zirconia ceramic powder: Take 1000g of zirconia ceramic powder, wash them with dilute nitric acid, dilute calcium sulfate and water, and put them in a vacuum drying oven for drying. Then, a mixture of 50 g of absolute ethanol and 10 g of methacryloxy silane is uniformly mixed with the aforementioned zirconia ceramic powder, and at the same time, the mixture is fully stirred by a stirring device for surface modification treatment. After the reaction is completed, the mixture is vacuum dried and sieved to obtain surface-modified zirconia ceramic powder with a particle size of 50 microns.

[0043] (2) Preparation of phenolic resin-coated zirconia ceramic aggregates: adding sur...

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Abstract

The invention provides a phenolic resin coated ceramic powder for laser 3D printing. The particle size of the ceramic powder is 10-50 mu m. The ceramic powder comprises 10-30 wt% of phenolic resin, 1-2.5 wt% of urotropine, 0.5-1.5 wt% of stearic acid and the balance of silane coupling agent surface-modified ceramic powder. The preparation method comprises the following steps: a) modifying the surface of the ceramic powder with anhydrous ethanol and a silane coupling agent; b) carrying out reaction on the surface-modified ceramic powder, phenolic resin, urotropine and stearic acid in a closed vessel to obtain an aggregate; and c) pulverizing the aggregate by ball milling, and screening. The ceramic powder is subjected to impurity removal and surface modification, thereby lowering the hydrophilicity, improving the wettability with the adhesive, and enhancing the efficiency of the adhesive and the strength of the initial mold blank. The phenolic resin has the advantages of higher absorptivity for laser and favorable adhesive effect, thereby being beneficial to enhancing the quality of the ceramic part. By using the urotropine as the curing agent and the stearic acid as the lubricant, the strength and plasticity of the SLS blank formed by the phenolic resin coated ceramic powder can be enhanced.

Description

Technical field [0001] The invention relates to the technical field of laser 3D printing powder material preparation, in particular to a phenolic resin coated ceramic powder for laser 3D printing and a preparation method thereof. Background technique [0002] Ceramic materials, especially high-performance ceramics, have many advantages such as high hardness, high temperature resistance, high strength, good insulation, and corrosion resistance, and have been widely used in aviation, aerospace, automotive, electronics and other fields. However, ceramic materials have high brittleness and high hardness. The traditional machining methods are easy to produce defects. Ceramic parts with complex structures are more difficult to process. When ceramic parts are formed by grouting, isostatic pressing, the shape of the parts is still affected by the mold. Restrictions, long manufacturing cycle and high cost. [0003] Selective Laser Sintering (Selective Laser Sintering, SLS) is a 3D printing...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/56C04B35/10C04B35/48C04B35/632B33Y70/00
CPCC04B35/565C04B35/10C04B35/48C04B35/5611C04B35/5622C04B35/632C04B2235/48C04B2235/5436C04B2235/6026
Inventor 刘凯陈方杰孙华君黄尚宇余际星
Owner WUHAN UNIV OF TECH
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