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A preparation method of silicon nitride porous ceramics for laser equipment

A technology of porous ceramics and laser equipment, applied in the field of laser applications and special ceramic materials, can solve problems such as product cracks and product scrapping, and achieve the effects of reducing cracks, reducing scrap rate, and enhancing the strength of pore walls.

Active Publication Date: 2019-02-05
安徽科创中光科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the existing method is used to prepare porous silicon nitride ceramics, cracks often occur on the product, resulting in the product being scrapped

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing silicon nitride porous ceramics for laser equipment, comprising the following steps:

[0020] 1) By weight, take 65% silicon nitride powder, 5% ammonium carbonate, 5% polyacrylamide, 10% SiO 2 , 2.5%Al 2 o 3 , 2.5% MgO, 5% B 2 o 3 and 5% Li 2 O as a raw material;

[0021] 2) ball milling the raw material for 2 hours, then adding water 5 times the weight of the raw material, mixing evenly, putting it into a mold and pressing it to form a silicon nitride ceramic body;

[0022] 3) Calcining in a nitrogen atmosphere, cooling to obtain silicon nitride porous ceramics, wherein the temperature of the calcination process is set according to the following procedure: at a heating rate of 0.1°C / min, keep at 100°C for 0.3h, and at 300°C for 0.5h, Insulate at 600°C for 1h, and at 1200°C for 2h; In addition, the temperature of the cooling process is set according to the following procedure: at a cooling rate of 2°C / min, hold at 1100°C for 0.2h, at 800°C f...

Embodiment 2

[0024] A method for preparing silicon nitride porous ceramics for laser equipment, comprising the following steps:

[0025] 1) By weight, take 55% silicon nitride powder, 15% ammonium carbonate, 5% polyacrylamide, 10% SiO 2 , 2.5%Al 2 o 3 , 1% MgO, 9% B 2 o 3 and 2.5% Li 2 O as a raw material;

[0026] 2) ball milling the raw material for 3 hours, then adding water 10 times the weight of the raw material, mixing evenly, putting it into a mold and pressing it to form a silicon nitride ceramic body;

[0027] 3) Calcining in a nitrogen atmosphere and cooling to obtain silicon nitride porous ceramics, wherein the temperature of the calcination process is set according to the following procedure: at a heating rate of 1.5°C / min, heat preservation at 100°C for 1h, heat preservation at 300°C for 2.5-5h, Insulate at 600°C for 2 hours and at 1300°C for 5 hours; In addition, the temperature of the cooling process is set according to the following procedure: at a cooling rate of 6°C...

Embodiment 3

[0029] A method for preparing silicon nitride porous ceramics for laser equipment, comprising the following steps:

[0030] 1) By weight, take 70% silicon nitride powder, 5% ammonium carbonate, 5% polyacrylamide, 5% SiO 2 , 2.5% Al 2 o 3 , 2.5% MgO, 8% B 2 o 3 and 2% Li 2 O as a raw material;

[0031] 2) ball milling the raw material for 6 hours, then adding water 30 times the weight of the raw material, mixing evenly, putting it into a mold and pressing it to form a silicon nitride ceramic body;

[0032] 3) Calcining in a nitrogen atmosphere, cooling to obtain silicon nitride porous ceramics, wherein the temperature of the calcination process is set according to the following procedure: at a heating rate of 3°C / min, keep at 100°C for 2h, at 300°C for 5h, and at 600°C Keep warm for 3 hours, keep warm at 400°C for 8 hours; in addition, the temperature of the cooling process is set according to the following procedure: according to the cooling rate of 10°C / min, keep warm a...

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PUM

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Abstract

The invention discloses a processing method of silicon nitride porous ceramic for laser equipment, and belongs to special ceramic material technical field .The method comprises the following steps of taking 35-85% silicon nitride powder, 3-15% ammonium carbonate,3-15% polyacrylamide,4-10%SiO2,1-5%Al2O3,2-10%MgO,2-10%B2O3 and 3-15%Li2O by weight parts as material,milling the material for 2-6h,then adding 5-30 times the weight of material of water,evenly mixing,placing in the mold to press mold thus getting silicon nitride ceramic body,calcining under a nitrogen atmosphere,cooling to obtain silicon nitride porous ceramic. The invention facilitates reducing material residues,reducing volume shrinkage in sintering process of the body,and forming open channels,reducing the occurrence of cracking,reducing the rejection rate.

Description

technical field [0001] The invention relates to a method for preparing silicon nitride porous ceramics used in laser equipment, and belongs to the technical field of special ceramic materials and the field of laser application. Background technique [0002] Laser equipment has high power and high heat generation, so it is necessary to use high-performance materials such as wear-resistant, anti-oxidation, and corrosion-resistant properties that are suitable for high-strength heat conduction. Silicon nitride ceramics have high strength, good thermal shock resistance, high fatigue toughness, high room temperature bending strength, wear resistance, oxidation resistance, corrosion resistance and other high performance, and have been widely used in various industries. [0003] Porous silicon nitride is a ceramic material fired at high temperature and has interconnected or closed pores in the body. Porous silicon nitride ceramics with high porosity can usually be used as filters, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/584C04B35/65
CPCC04B35/584C04B35/591C04B38/067C04B38/069C04B2235/3203C04B2235/3206C04B2235/3217C04B2235/3409C04B2235/3418C04B2235/442C04B2235/46C04B2235/661
Inventor 汪思保林永兴
Owner 安徽科创中光科技股份有限公司