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Preparation method of silicon carbide porous material

A technology of porous materials and silicon carbide, applied in the field of preparation of porous silicon carbide materials, can solve the problems of high preparation cost of porous silicon carbide ceramics, high price of pore-forming agents, environmental pollution, etc., to reduce production and preparation costs, facilitate sintering and The effect of forming and shortening the preparation process

Inactive Publication Date: 2016-12-21
NINGBO DONGLIAN MECHANICAL SEAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these traditional methods for preparing porous ceramics usually need to add a large amount of organic pore-forming agents and binders. When organic matter is cracked at high temperature, a large amount of volatiles will be generated, causing environmental pollution and other problems. In addition, these pore-forming agents are expensive and have a large loss, resulting in The preparation cost of porous silicon carbide ceramics is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, the preparation method of silicon carbide porous material comprises the following steps:

[0028] 1) After the main material is processed, it is a finished slurry, and the main material includes SiC pellets and B 4 C pellets, B 4 C pellets are used as sintering aids, the particle size of SiC pellets is 0.8 μm, B 4The size of C pellets is 3.2 μm;

[0029] 2), adding auxiliary materials to the finished slurry product obtained in step 1) to prepare the pre-casting slurry, and keep stirring when adding, wherein the auxiliary materials include acrylamide, methylenebisacrylamide, ammonium polyacrylate;

[0030] 3) Die casting, add ammonium persulfate to the slurry before casting and stir evenly before die casting, demoulding into a green body;

[0031] 4) Dehydration and degreasing, sintering. After sintering, the temperature is lowered to 500°C at a rate of 5°C / min and kept for 2 hours, and then cooled with the furnace.

Embodiment 2

[0033] In this embodiment, the preparation method of silicon carbide porous material comprises the following steps:

[0034] 1) After the main material is processed, it is a finished slurry, and the main material includes SiC pellets and B 4 C pellets, B 4 C pellets are used as sintering aids, the particle size of SiC pellets is 0.75 μm, B 4 The size of C pellets is 3.2 μm;

[0035] 2), adding auxiliary materials to the finished slurry product obtained in step 1) to prepare the pre-casting slurry, and keep stirring when adding, wherein the auxiliary materials include acrylamide, methylenebisacrylamide, ammonium polyacrylate;

[0036] 3) Die casting, add ammonium persulfate to the slurry before casting and stir evenly before die casting, demoulding into a green body;

[0037] 4) Dehydration and degreasing, sintering. After sintering, cool down to 505°C at a rate of 6°C / min and hold for 2.6 hours, then cool with the furnace.

Embodiment 3

[0039] In this embodiment, the preparation method of silicon carbide porous material comprises the following steps:

[0040] 1) After the main material is processed, it is a finished slurry, and the main material includes SiC pellets and B 4 C pellets, B 4 C pellets are used as sintering aids, the particle size of SiC pellets is 0.7μm, B 4 The size of C pellets is 3.2 μm;

[0041] 2), adding auxiliary materials to the finished slurry product obtained in step 1) to prepare the pre-casting slurry, and keep stirring when adding, wherein the auxiliary materials include acrylamide, methylenebisacrylamide, ammonium polyacrylate;

[0042] 3) Die casting, add ammonium persulfate to the slurry before casting and stir evenly before die casting, demoulding into a green body;

[0043] 4) Dehydration and degreasing, sintering. After sintering, cool down to 512°C at a rate of 7°C / min and hold for 2.65 hours, then cool with the furnace.

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Abstract

The invention discloses a preparation method of a silicon carbide porous material. The preparation method includes the steps of: 1) treating main materials, including a SiC particle material and a B4C particle material, to form a slurry finish product, wherein the B4C particle material serves as a sintering aid, the particle size of the SiC particle material is not more than 0.8 [mu]m and the size of the B4C particle material is 3.2 [mu]m; 2) adding auxiliary materials to the slurry finish product to prepare a pre-casting slurry material with stirring during addition, wherein the auxiliary materials include acrylamide, methylene bisacrylamide and ammonium polyacrylate; 3) die casting: adding ammonium persulfate to the pre-casting slurry material with uniform stirring, and performing die casting and demoulding the casted blank body; and 4) dewatering and degreasing the blank body and sintering the blank body. In the technical scheme, the SiC particle material being smaller in particle size serves as a main gel material while the B4C particle material being larger in particle size serves as the sintering aid and a framework material, thus preparing high-quality silicon carbide gel.

Description

technical field [0001] The invention relates to a preparation method of a porous silicon carbide material, in particular to a preparation method of a silicon carbide porous material. Background technique [0002] Due to the advantages of low density, high temperature resistance, corrosion resistance, high permeability, good oxidation resistance and thermal shock resistance, porous silicon carbide ceramics are widely used in high temperature gas filter materials, catalyst carriers, gas combustion chamber media and refractory materials. It has broad application prospects. At present, the porous ceramics that have been widely used are mostly oxide ceramics, but they have disadvantages such as poor high-temperature performance and insufficient corrosion resistance, and porous silicon carbide ceramics can just make up for these deficiencies; in addition, many special fields require porous ceramic materials. The performance of silicon carbide puts forward higher requirements, and...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B38/10C04B35/632C04B35/634
CPCC04B35/565C04B35/632C04B35/63436C04B38/10C04B2235/3821C04B2235/5436C04B2235/5445C04B2235/96C04B2235/9615
Inventor 李友宝励永平叶传剑
Owner NINGBO DONGLIAN MECHANICAL SEAL