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Preparation method of Si3N4/BAS-based ceramic material

A technology of ceramic materials and silicon nitride powder, which is applied in the field of preparation of Si3N4/BAS-based ceramic materials, can solve the problems of difficult molding, non-uniform BAS phase, complex shapes and special-shaped products, etc., to achieve high solid content and solve density differences. , No effect of volatile organic compounds

Pending Publication Date: 2022-02-22
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solution of the present invention can effectively solve the existing Si 3 N 4 In the process of preparing BAS composite ceramic materials, there are technical defects such as inhomogeneous BAS phase and difficulty in forming complex shapes and special-shaped products.

Method used

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  • Preparation method of Si3N4/BAS-based ceramic material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: Pretreatment of silicon nitride powder. First, ultrasonically disperse the silicon nitride powder in an aqueous solution of TEAOH to obtain a suspension (pH=9.8). Under magnetic stirring, add Al(NO 3 ) 3 and ammonia water (20-25wt%), after the reaction is completed (the pH of the solution remains unchanged during this process), the coating is washed three times with deionized water and alcohol respectively, dried at 80°C for 24h, and then dried at 600°C under a nitrogen atmosphere It can be calcined for 2 hours, wherein the coating is 18wt% of the mass of the silicon nitride powder;

[0031] Step 2: Powder mixing: uniformly mix the silicon nitride powder, barium carbonate and absolute ethanol pretreated in step 1, take out after ball milling for 5 hours, dry at 60°C for 36 hours, and pass through a 60-mesh sieve. The mass ratio of silicon carbide powder to barium carbonate is 5:1, and the mass ratio of powder to absolute ethanol is 1:3;

[0032] Step 3: slurry...

Embodiment 2

[0051] Step 1: Pretreatment of silicon nitride powder. First, ultrasonically disperse the silicon nitride powder in an aqueous solution of TEAOH to obtain a suspension (pH=9.8). Under magnetic stirring, add Al(NO 3 ) 3 and ammonia water (20-25wt%), after the reaction is completed (the pH of the solution remains unchanged during this process), the coating is washed three times with deionized water and alcohol respectively, dried at 80°C for 24h, and then dried at 600°C under a nitrogen atmosphere Calcining for 2 hours, wherein the coating is 20wt% of the mass of the silicon nitride powder;

[0052] Step 2: Powder mixing: uniformly mix the silicon nitride powder, barium carbonate and absolute ethanol pretreated in step 1, take out after ball milling for 5 hours, dry at 60°C for 36 hours, and pass through a 60-mesh sieve. The mass ratio of silicon carbide powder to barium carbonate is 5:1, and the mass ratio of powder to absolute ethanol is 1:3;

[0053] Step 3: slurry preparat...

Embodiment 3

[0057] Step 1: Pretreatment of silicon nitride powder. First, ultrasonically disperse the silicon nitride powder in an aqueous solution of TEAOH to obtain a suspension (pH=9.8). Under magnetic stirring, add Al(NO 3 ) 3 and ammonia water (20-25wt%), after the reaction is completed (the pH of the solution remains unchanged during this process), the coating is washed three times with deionized water and alcohol respectively, dried at 80°C for 24h, and then dried at 600°C under a nitrogen atmosphere It can be calcined for 2 hours, wherein the coating is 18wt% of the mass of the silicon nitride powder;

[0058] Step 2: Powder mixing: uniformly mix the silicon nitride powder, barium carbonate and absolute ethanol pretreated in step 1, take out after ball milling for 5 hours, dry at 60°C for 36 hours, and pass through a 60-mesh sieve. The mass ratio of silicon carbide powder to barium carbonate is 5:1, and the mass ratio of powder to absolute ethanol is 1:3;

[0059] Step 3: slurry...

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Abstract

The invention provides a preparation method of a Si3N4 / BAS-based ceramic material, and aims to solve the problems that the Si3N4 / BAS-based ceramic material prepared in the prior art has density difference, is non-uniform in microstructure, is not easy to form complex-shaped and special-shaped products and the like. The preparation method comprises the following steps: firstly, carrying out surface pretreatment on silicon nitride powder by adopting a precipitation method, so that the silicon nitride powder is coated with a layer of film with oxide characteristics; carrying out ball milling on the pretreated silicon nitride powder and barium carbonate, sieving, carrying out mixed ball milling on the sieved product and a silica sol premixed solution containing an organic monomer, and vacuumizing to obtain silicon nitride ceramic slurry; and finally, preparing the required sample through 3D printing, degreasing and sintering.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional ceramics and relates to a Si 3 N 4 The preparation method of / BAS-based ceramic material, especially a kind of Si based on SLA technology 3 N 4 / BAS-based ceramic material preparation method. Background technique [0002] Silicon nitride ceramics Silicon nitride ceramics have excellent high temperature strength, corrosion resistance and thermal shock resistance, and have been widely used in aerospace, machinery industry, electronic power, armor and other fields. Because of its excellent dielectric properties, it is often used as a new type of wave-transparent material for hypersonic aircraft. [0003] BAS (BaAl 2 Si 2 o 8 or BaO·Al 2 o 3 2SiO2 2 ) is the glass ceramic with the highest melting point, up to 1760°C, effective refractoriness of 1590°C, liquid phase BaO·Al 2 o 3 2SiO2 2 with Si 3 N 4 The particles have sufficient wettability and solubility, and can prom...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/195C04B35/628C04B35/64C04B35/626
CPCC04B35/584C04B35/195C04B35/62813C04B35/64C04B35/6261C04B2235/6562C04B2235/3215
Inventor 董衡李淑琴韩耀王涛吕毅张剑张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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