Preparation of silicon nitride ceramic powder through laser sintering and rapid moulding

A technology of silicon nitride ceramics and laser sintering, which is applied in the preparation and application of laser sintering rapid prototyping silicon nitride ceramic powder, and the field of preparation of laser sintering rapid prototyping powder materials, which can solve the problems of increasing preparation costs and achieve particle size distribution The effect of narrow range, stable properties and high precision

Inactive Publication Date: 2015-09-30
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

[0026] (1) Pretreatment of silicon nitride ceramic powder: In the reactor, add water: 65 mL, polyvinyl alcohol: 3 g, heat to dissolve, then add silicon nitride ceramic powder: 32 g, stir vigorously, and react for 3 h, Then spray drying to obtain pretreated silicon nitride ceramic powder;

[0027] (2) Preparation of laser sintering rapid prototyping silicon nitride ceramic powder: In the grinder, add separately, pretreated silicon nitride ceramic powder: 82g, phenolic resin: 6g, polyvinyl butyral: 2.5 mL, triethylene glycol Basetetramine: 1.0 mL, turn on the grinder at 250 rpm, grind for 5 minutes, then add acetone: 10 mL, turn the grinder at 250 rpm, grind for 50 minutes, and dry to obtain laser sintered rapid prototyping silicon nitride Ceramic powder, the obtained laser sintering rapid prototyping silicon nitride ceramic powder has a particle size within the range of 0.1-0.5 μm.

Embodiment 2

[0029] (1) Pretreatment of silicon nitride ceramic powder: In the reactor, add water: 70 mL, polyvinyl alcohol: 2 g, heat to dissolve, then add silicon nitride ceramic powder: 28 g, stir vigorously, and react for 2 h. Then spray drying to obtain pretreated silicon nitride ceramic powder;

[0030](2) Preparation of laser sintering rapid prototyping silicon nitride ceramic powder: In the grinder, add separately, pretreated silicon nitride ceramic powder: 80g, phenolic resin: 8g, polyvinyl butyral: 3.3 mL, Sanethylene Basetetramine: 0.8 mL, turn on the grinder at 250 rpm, grind for 5 minutes, then add acetone: 9 mL, turn the grinder at 250 rpm, grind for 40 minutes, and dry to obtain laser sintered rapid prototyping silicon nitride Ceramic powder, the obtained laser sintering rapid prototyping silicon nitride ceramic powder has a particle size within the range of 0.1-0.5 μm.

Embodiment 3

[0032] (1) Pretreatment of silicon nitride ceramic powder: In the reactor, add water: 60 mL, polyvinyl alcohol: 5 g, heat to dissolve, then add silicon nitride ceramic powder: 35 g, stir vigorously, and react for 4 h. Then spray drying to obtain pretreated silicon nitride ceramic powder;

[0033] (2) Preparation of laser sintering rapid prototyping silicon nitride ceramic powder: In the grinder, add separately, pretreated silicon nitride ceramic powder: 80g, phenolic resin: 4g, polyvinyl butyral: 1.6 mL, triethylene glycol Basetetramine: 2.0 mL, turn on the grinder at 250 rpm, grind for 5 minutes, then add acetone: 15 mL, turn the grinder at 250 rpm, grind for 60 minutes, and dry to obtain laser sintered rapid prototyping silicon nitride Ceramic powder, the obtained laser sintering rapid prototyping silicon nitride ceramic powder has a particle size within the range of 0.1-0.5 μm.

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Abstract

The invention discloses a preparation method of silicon nitride ceramic powder through laser sintering and rapid moulding. The method comprises the following steps: pretreating silicon nitride ceramic powder by using polyvinyl alcohol to obtain the pretreated silicon nitride ceramic powder; then in a grinder, adding the following components by mass percentage: 80-85% of pretreated silicon nitride ceramic powder, 4-8% of phenolic resin, 2-5% of polyvinyl butyral and 0.8-3% of triethylenetetramine, turning on the grinder with rotating speed being 250 rotation/min, grinding for 5 minutes, adding 7-12% of acetone, wherein sum of the components is 100%, and rotating speed of the grinder is 250 rotation/min, grinding for 40-60 minutes, and drying to obtain the silicon nitride ceramic powder. The material can be directly moulded under laser sintering, moulding precision is high, and the method has the advantages of simple preparation technology, easy control of condition, low production cost, and easy industrial production.

Description

technical field [0001] The invention relates to a preparation method for laser sintering rapid prototyping powder material, which belongs to the field of rapid prototyping materials, in particular to the preparation and application of laser sintering rapid prototyping silicon nitride ceramic powder. Background technique [0002] Rapid prototyping (RP) technology is an advanced manufacturing technology developed in the 1990s. It is a key common technology for the development of new products for manufacturing companies. It promotes product innovation, shortens new product development cycles, and improves product competition. Power has a positive impetus. Since the technology came out, it has been widely used in the manufacturing industry in developed countries, and a new technical field has emerged. [0003] RP technology is integrated and developed on the basis of modern CAD / CAM technology, laser technology, computer numerical control technology, precision servo drive techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/622
Inventor 李慧芝张培志曹冲陈亚明候金焕徐维峰
Owner UNIV OF JINAN
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