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Preparation method for nano-silicon nitride powder for laser sintering 3D printing technology

A nano-silicon nitride and 3D printing technology, which is applied in the direction of additive processing, etc., can solve the problems of increasing the production cost, and achieve the effect of narrow particle size distribution, easy control of conditions, and small median particle size

Inactive Publication Date: 2015-07-22
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation methods of silicon nitride ceramics mainly include: powder pressing and sintering method, sol-gel method and reaction sintering method. A slight change in the shape of the component requires re-preparation of the mold or machining of the sample, thus increasing the cost of preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Pretreatment of nano-silicon nitride powder: In the reactor, add ethanol: 57 mL, γ-glycidyl etheroxypropyl trimethoxysilane: 22 mL, stir well, and then add nano-silicon nitride ceramics Powder: 32g, placed at a constant temperature of 60°C, vigorously stirred, and refluxed for 3 hours, filtered and separated, the filtrate was recovered, washed with ethanol, dried, and ground to obtain pretreated nano-silicon nitride powder;

[0026] (2) Preparation of nano-silicon nitride powder for laser sintering 3D printing technology: In the grinder, add separately, pre-treated nano-silicon nitride powder: 87g, epoxy resin: 5g, pyromellitic anhydride: 0.5g, Turn on the grinder at a speed of 300 rpm, grind for 5 minutes, then add acetone: 10 mL, turn on the grinder at a speed of 300 rpm, grind for 35 minutes, and dry to obtain nano-silicon nitride powder for laser sintering 3D printing technology. The particle size of nano-silicon nitride powder used in laser sintering 3D printin...

Embodiment 2

[0028] (1) Pretreatment of nano-silicon nitride powder: In the reactor, add ethanol: 63 mL, γ-glycidyl etheroxypropyl trimethoxysilane: 19 mL, stir well, and then add nano-silicon nitride ceramics Powder: 30g, placed at a constant temperature of 55°C, vigorously stirred, and refluxed for 2 hours, filtered and separated, the filtrate was recovered, washed with ethanol, dried, and ground to obtain pretreated nano-silicon nitride powder;

[0029](2) Preparation of nano-silicon nitride powder for laser sintering 3D printing technology: In the grinder, add separately, pre-treated nano-silicon nitride powder: 84g, epoxy resin: 8g, pyromellitic anhydride: 1g, open The speed of the grinder is 300 rpm, grind for 5min, then add acetone: 9 mL, turn on the grinder at a speed of 300 rpm, grind for 30min, and dry to obtain nano-silicon nitride powder for laser sintering 3D printing technology, the obtained The particle size of nano-silicon nitride powder used in laser sintering 3D printing ...

Embodiment 3

[0031] (1) Pretreatment of nano-silicon nitride powder: In the reactor, add ethanol: 51 mL, γ-glycidyl etheroxypropyl trimethoxysilane: 24 mL, stir well, and then add nano-silicon nitride ceramics Powder: 35g, placed at a constant temperature of 65°C, vigorously stirred, and refluxed for 4 hours, filtered and separated, the filtrate was recovered, washed with ethanol, dried, and ground to obtain pretreated nano-silicon nitride powder;

[0032] (2) Preparation of nano-silicon nitride powder for laser sintering 3D printing technology: In the grinder, add separately, pre-treated nano-silicon nitride powder: 90g, epoxy resin: 4g, pyromellitic anhydride: 0.4g, Turn on the grinder at a speed of 300 rpm, grind for 5 minutes, then add acetone: 7 mL, turn on the grinder at a speed of 300 rpm, grind for 40 minutes, and dry to obtain nano-silicon nitride powder for laser sintering 3D printing technology. The particle size of nano-silicon nitride powder used in laser sintering 3D printing...

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Abstract

The invention discloses a preparation method for a nano-silicon nitride powder for the laser sintering 3D printing technology. The preparation method is characterized by comprising the following steps: firstly, using gamma-glycidoxypropyl trimethoxysilane for the pretreatment of nano-silicon nitride powder in an ethanol solvent to obtain pretreated nano-silicon nitride powder; then, adding the following components by mass percentage into a grinding machine to obtain a mixture I: 84%-90% of pretreated nano-silicon nitride powder, 3%-8% of epoxy resin and 0.4%-1.0% of pyromellitic dianhydride, starting the grinding machine, grinding the mixture I at a revolution speed of 300 rpm for 5 min, and then adding 5%-10% of acetone to obtain a mixture II, turning on the grinding machine, grinding the mixture II at a revolution speed of 300 rpm for 30-40 min, and drying the grinded mixture II to obtain the nano-silicon nitride powder for laser sintering 3D printing technology. The nano-silicon nitride powder for the laser sintering 3D printing technology can be molded directly under laser sintering, is simple in preparation process, low in production cost, and easy to realize industrial production, and the condition is easy to control.

Description

technical field [0001] The invention relates to a method for preparing powder molding materials used in laser sintering 3D printing manufacturing technology, which belongs to the field of rapid prototyping materials, and in particular to the preparation and application of nano silicon nitride powder for laser sintering 3D printing technology. Background technique [0002] Laser sintering is a method of additive manufacturing. This process also uses the laser as the energy source, and the powder of plastic, wax, ceramic, metal or its composite is uniformly sintered on the processing plane through the laser beam. Spread a layer of very thin (sub-millimeter) powder evenly on the workbench as the raw material, and the laser beam is scanned by the scanner at a certain speed and energy density according to the layered two-dimensional data under the control of the computer. After scanning by the laser beam, the powder at the corresponding position is sintered into a solid sheet wi...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/626B33Y70/00
Inventor 李慧芝张培志曹冲王英姿许崇娟
Owner UNIV OF JINAN
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