Rice-husk-based porous silicon carbide ceramic material and preparing method thereof

A technology of silicon carbide ceramics and porous silicon carbide, which is applied in the field of ceramic materials, can solve problems such as complex technical conditions, pore size distribution, mechanical strength, silicon carbide microstructure and morphology, and limited practical application range, and achieve simple and easy control of the process, The effect of reduced preparation cost, broad development space and application prospect

Active Publication Date: 2017-01-11
马琰珂
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN103803982B discloses a preparation method of rice husk stacked porous silicon carbide, which involves drying rice husks impregnated with phenolic resin, stacking them into shapes, carbonizing them at 300-1300°C under vacuum conditions to obtain carbonized products, and then combining the carbonized products with silicon The powder is siliconized at 1420-1750°C to make porous silicon carbide ceramics; this method can obtain porous or foamed silicon carbide ceramics with a porosity of 30%-70%, but it does not affect the pore size distribution, mechanical strength and microstructure of silicon carbide. The morphology is further explained, and vacuum conditions are required, the technical conditions are relatively complicated, and the practical application range is limited

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  • Rice-husk-based porous silicon carbide ceramic material and preparing method thereof

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Effect test

Embodiment 1

[0033] The rice husk-based porous silicon carbide ceramic material of this embodiment is prepared from rice husk, water and a mixture, the quality of the mixture is 40% of the mass of the rice husk; the mixture consists of the following components in mass percentage: Silicon powder 26%, graphite 37%, NaCl 6%, dextrin powder 31%; according to the ratio, take the raw materials and mix them in a ball mill mixer for 1 hour to obtain the mixture.

[0034] The preparation method of the rice husk-based porous silicon carbide ceramic material of this embodiment adopts the following steps:

[0035] 1) Add the rice husk powder into the blender, add water with 45% weight of the rice husk powder, and stir to make the rice husk powder fully wet; then add the mixture, and stir for 5 minutes to make a billet;

[0036] 2) The billet was machine-pressed under low pressure, the molding pressure was 1 MPa, and the holding time was 20s to obtain the green body; the green body was dried at 110°C f...

Embodiment 2

[0038] The rice husk-based porous silicon carbide ceramic material of this embodiment is prepared from rice husk, water and a mixture, the quality of the mixture is 65% of the mass of the rice husk; the mixture consists of the following components in mass percentage: Silicon powder 2%, carbon black 40%, Fe3%, Fe 2 o 3 5%, dextrin powder 28%, gelatin 22%; take the raw materials according to the ratio and mix them in a ball mill mixer for 1 hour to get the mixture.

[0039]The preparation method of the rice husk-based porous silicon carbide ceramic material of this embodiment adopts the following steps:

[0040] 1) Add the rice husk powder into the blender, add water with 57% of the weight of the rice husk powder, and stir to make the rice husk powder fully wet; then add the mixture, and stir for 5 minutes to make a billet;

[0041] 2) The billet was machine-pressed under low pressure, the molding pressure was 3MPa, and the pressure holding time was 10s to obtain the green bo...

Embodiment 3

[0043] The rice husk-based porous silicon carbide ceramic material of this embodiment is prepared from rice husk, water and a mixture, the quality of the mixture is 50% of the mass of the rice husk; the mixture consists of the following components in mass percentage: 3% silicon powder, 25% anthracite, 8% graphene, 6% NaCl, 45% pulp powder, 13% polyvinyl butyral; take the raw materials according to the proportion and mix them in a ball mill mixer for 1 hour to obtain the mixture.

[0044] The preparation method of the rice husk-based porous silicon carbide ceramic material of this embodiment adopts the following steps:

[0045] 1) Add the rice husk powder into the blender, add water with 55% weight of the rice husk powder, and stir to make the rice husk powder fully wet; then add the mixture, and stir for 5 minutes to make a billet;

[0046] 2) The billet was machine-pressed under low pressure, the molding pressure was 2 MPa, and the pressure holding time was 15s to obtain the ...

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Abstract

The invention discloses a rice-husk-based porous silicon carbide ceramic material and a preparing method thereof. The rice-husk-based porous silicon carbide ceramic material is mainly prepared from rice husks and a mixture, and mass of the mixture is 30%-70% of that of the rice husks; the mixture is prepared from, by mass, 1%-30% silicon powder, 5%-40% carbon source, 1%-15% catalyst and 30%-70% binding agent. Agricultural residue rice husk serves as the main raw material of the rice-husk-based porous silicon carbide ceramic material, and is mixed with silicon powder, carbon source, catalyst and binder to prepare a semi-finished product after formation, drying and calcination; the source of the raw material which are used has wide source and low cost, the prepared product has the advantages of high porosity, big mechanical strength, good filtering effect, excellent thermal shock resistance, micro and fine hole diameter of pore, adjustable micro-morphology and the like, has wide development space and application prospect, and is suitable for industrial popularization and application.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a rice husk-based porous silicon carbide ceramic material and a preparation method thereof. Background technique [0002] Porous silicon carbide ceramic materials have the characteristics of good heat insulation effect, strong filterability, high temperature resistance, corrosion resistance, high strength, and excellent thermal shock resistance. They are widely used in thermal insulation, purification of high-temperature flue gas and filtration of molten metal and other fields. At present, the preparation of porous silicon carbide ceramic materials often uses silicon carbide as the main raw material, and is prepared by adding combustibles to form pores and sintering by high-temperature solid-state reaction. However, because silicon carbide is relatively expensive and has strong covalent bonds (about 88%), its high-temperature diffusion coefficient is low. A...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/573C04B35/63C04B35/634C04B35/636C04B35/64C04B35/80
CPCC04B35/573C04B35/62204C04B35/62213C04B35/6303C04B35/6342C04B35/636C04B35/64C04B35/806C04B38/0675C04B2235/3272C04B2235/405C04B2235/422C04B2235/425C04B2235/444C04B2235/48C04B2235/5244C04B2235/5276C04B2235/5436C04B2235/658C04B2235/66C04B2235/77C04B2235/96C04B38/0067C04B38/0074
Inventor 马琰珂
Owner 马琰珂
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