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Silicon nitride porous ceramic and preparation method thereof

A technology of porous ceramics and silicon nitride, applied in the field of ceramics, can solve the problems of poor corrosion resistance and heat resistance, complex preparation process, and low bending strength of ceramics, achieve low raw material cost, simple process, and improve corrosion resistance Effect

Inactive Publication Date: 2013-12-25
射阳县射阳港渔工贸开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the silicon nitride porous ceramics prepared by existing methods have some defects, some of which have poor corrosion resistance and heat resistance due to the presence of unreacted silicon powder in the products, and some products have low flexural strength. Some have the defects of high sintering temperature, complicated preparation process and high production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Preparation and Properties of Silicon Nitride Porous Ceramics

[0039] Rice husk pretreatment: soak and boil the rice husk with hydrochloric acid solution with a volume fraction of 10%, dry it, put it into a sagger, carbonize it at 540°C for 2 hours, and grind it for 1 hour to make C / SiO 2 A carbon-silicon precursor with a median particle size of 1.3 and less than 2.0 μm;

[0040] Mixing: raw materials (including 87% carbon silicon precursor, 5% α-silicon nitride powder, 3% Fe 2 o 3 and 5%Y 2 o 3 ) is placed in a ball mill tank, adding ethanol whose weight is 1.5 times the total weight of the above raw materials for ball milling and mixing, adding 5% (weight ratio) polyvinyl alcohol solution after drying, grinding and granulating, passing through a 120-mesh sieve to obtain a mixture;

[0041] Molding: Molding the mixture at 5MPa to obtain a green body;

[0042] Firing: After drying the green body, put it into a graphite can coated with boron nitride, and...

Embodiment 2

[0044] Example 2 Preparation and Properties of Silicon Nitride Porous Ceramics

[0045] Rice husk pretreatment: Soak and boil the rice husk with hydrochloric acid solution with a volume fraction of 10%, dry it, put it into a sagger, carbonize it at 540°C for 1 hour, and grind it for 1 hour to make C / SiO 2 A carbon-silicon precursor with a median particle size of 1.5 and less than 2.0 μm;

[0046] Mixing: raw materials (including 79% carbon silicon precursor, 8% α-silicon nitride powder, 8% NaF and 5% CeO 2) is placed in a ball mill tank, adding ethanol whose weight is 1.5 times the total weight of the above raw materials for ball milling and mixing, adding 5% (weight ratio) polyvinyl alcohol solution after drying, grinding and granulating, passing through a 120-mesh sieve to obtain a mixture;

[0047] Molding: Molding the mixed material under 3MPa to obtain green body;

[0048] Firing: After drying the green body, put it into a graphite can coated with boron nitride, and p...

Embodiment 3

[0050] Example 3 Preparation and Properties of Silicon Nitride Porous Ceramics

[0051] Rice husk pretreatment: Soak and boil the rice husk with hydrochloric acid solution with a volume fraction of 10%, dry it, put it into a sagger, carbonize it at 540°C for 1 hour, and grind it for 1 hour to make C / SiO 2 A carbon-silicon precursor with a median particle size of 1.5 and less than 2.0 μm;

[0052] Mixing: raw materials (including 76% carbon silicon precursor, 8% α-silicon nitride powder, 10% NaF, 3% Al 2 o 3 and 3% MgO) in a ball mill tank, adding ethanol with a weight of 1.5 times the total weight of the above raw materials for ball milling and mixing, adding 5% (weight ratio) polyvinyl alcohol solution after drying, grinding and granulating, passing through a 120-mesh sieve, get the mixture;

[0053] Molding: Molding the mixed material under 10MPa to obtain green body;

[0054] Firing: After drying the green body, put it into a graphite can coated with boron nitride, an...

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Abstract

The invention provides a silicon nitride porous ceramic and a preparation method thereof. The silicon nitride porous ceramic is prepared by sintering reaction raw materials, wherein the reaction raw materials comprises 76-87 parts by weight of siliceous precursor, 5-8 parts of silicon nitride and 8-16 parts of additive, wherein the siliceous precursor is made by carbonizing rice hulls. The silicon nitride porous ceramic is made by adopting low-cost agricultural waste rice hulls as a raw material, a preparation technology of the silicon nitride porous ceramic product is simple, the sintering temperature is low, and the production cost is low.

Description

technical field [0001] The invention belongs to the field of ceramics, and in particular relates to a silicon nitride porous ceramic and a preparation method thereof. Background technique [0002] Silicon nitride porous ceramics is a new type of ceramic material gradually developed on the basis of research on silicon nitride ceramics and porous ceramics. It has the high strength, high toughness, high temperature resistance, oxidation resistance and wear resistance of silicon nitride ceramics. It has the advantages of good damage and thermal shock resistance, and has the characteristics of small porous material density, good chemical stability, high geometric surface area to volume ratio, low dielectric constant and dielectric loss, etc. It is a structure and function with excellent comprehensive performance. It is also an ideal high-temperature filter material and catalytic carrier material. The methods currently used to prepare porous silicon nitride ceramics include react...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622C04B38/06
Inventor 郭伟荆涛
Owner 射阳县射阳港渔工贸开发有限公司
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