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Method for preparing ball shaped, porous ceramic material contg. silicon carbide with biological structure

A technology of porous silicon carbide and ceramic materials, applied in ceramic products, other household appliances, household appliances, etc.

Active Publication Date: 2006-09-13
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, spherical biomass silicon carbide, silicon nitride, silicon carbide and silicon nitride composite ceramic materials and preparations with unique structures have not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Dry the millet in an oven at 100°C for 4 days.

[0019] 2. Put the dried millet into a tube furnace, and under the protection of argon, heat up to 600°C for carbonization for 5 hours. Before 300°C, the heating rate is 1°C / min, and the subsequent heating rate is 5°C / min .

[0020] 3. Weigh 28 grams of silicon powder and put it into the bottom layer of CVD (Chemical Vapor Deposition) vacuum furnace, put 12 grams of carbonized millet into the upper layer of CVD vacuum furnace, vacuumize, and heat to 1500 °C at a heating rate of 3 °C / min. Constant temperature for 5 hours.

[0021] 4. The above sample was treated in the air at 600°C for 4 hours to remove unreacted carbon, and then pickled with hydrochloric acid and hydrofluoric acid to remove unreacted silicon to obtain pure spherical porous SiC. The particle diameter is between 0.2-0.5cm, and the pore diameter is between 0.01μm-100μm.

Embodiment 2

[0023] 1. Dry the millet in an oven at 130°C for 3 days.

[0024] 2. Put the dried millet into a tube furnace, and under the protection of argon, heat up to 800°C for carbonization for 3 hours. Before 400°C, the heating rate is 2°C / min, and the subsequent heating rate is 6°C / min .

[0025] 3. Weigh 56 grams of silicon powder and put it into the bottom layer of CVD (Chemical Vapor Deposition) vacuum furnace, put 6 grams of carbonized millet into the upper layer of CVD vacuum furnace, vacuumize, and heat to 1800 °C at a heating rate of 5 °C / min. Constant temperature for 3 hours.

[0026] 4. The above sample was treated in the air at 700°C for 3 hours to remove unreacted carbon, and then pickled with hydrochloric acid and hydrofluoric acid to remove unreacted silicon to obtain pure spherical porous SiC. The particle diameter is between 0.2-0.5cm, and the pore diameter is between 0.01μm-100μm.

Embodiment 3

[0028] 1. Dry the millet in an oven at 150°C for 1 day.

[0029] 2. Put the dried millet into a tube furnace, and under the protection of argon, heat up to 1200°C for carbonization for 1 hour. Before 600°C, the heating rate is 5°C / min, and the subsequent heating rate is 10°C / min .

[0030] 3. Weigh 84 grams of silicon powder and put it into the bottom layer of a CVD (Chemical Vapor Deposition) vacuum furnace, put 4 grams of carbonized millet into the upper layer of the CVD vacuum furnace, vacuumize it, and heat it to 2000°C at a heating rate of 10°C / min. Keep warm for 1 hour.

[0031] 4. The above sample was treated in the air at 800°C for 1 hour to remove unreacted carbon, and then pickled with hydrochloric acid and hydrofluoric acid to remove unreacted silicon to obtain pure spherical porous SiC. The particle diameter is between 0.2-0.5cm, and the pore diameter is between 0.01μm-100μm.

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Abstract

A spherical porous silicon carbide ceramic material with biologic structure is prepared from the seeds of agricultural crops (millet, rice, soybean, etc) through carbonizing in argon gas, the gas-phase osmosis of Si, liquid-phase osmosis of Si, or sol-gel carbothermal reduction for siliconizing, heat treating at 600-800 deg.C, and washing with hydrochloric acid and hydrofluoric acid.

Description

technical field [0001] The invention belongs to a preparation method of a biological structure ceramic material, in particular to a preparation method of a biological structure spherical porous silicon carbide ceramic material. technical background [0002] Biomass has a complex multi-level cellular structure, and different types of biomass have different structural characteristics, thus having different properties and uses. Biomass ceramic materials The ceramic materials converted from biomass maintain the shape and structural characteristics similar to the raw materials, so the biomass ceramic materials with unique structure and mechanical properties are ideal for adsorption and separation of gases and liquids, exhaust filtration, Ideal material for catalyst supports, heat insulators and electromagnetic shielding. Among many biomass structural ceramic materials, SiC has good mechanical strength, thermal stability, chemical inertness, thermal and electrical conductivity, a...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B38/00
Inventor 郭向云王庆靳国强
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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