Preparation method of rice hull stacked porous silicon carbide

A porous silicon carbide and rice husk technology, which is applied to ceramic products, other household utensils, household utensils, etc., can solve the problems of polluting the environment and wasting resources, and achieves the effect of high porosity, adjustable porosity, and simple method

Active Publication Date: 2014-05-21
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, many places regard rice husk as waste, which not only wastes resources, but also pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh 100g of rice husk, soak it in phenolic resin for 30 minutes, filter and dry it, pile it up in a ceramic crucible, and carbonize it in a vacuum furnace. The carbonization temperature is 1200°C and the carbonization time is 15 minutes. In the crucible of silicon powder, the temperature was raised to 1500°C for silicification. The silicification time was 30 minutes, and finally a porous silicon carbide ceramic with a porosity of 50% was obtained.

Embodiment 2

[0015] Weigh 100g of rice husks, put them in phenolic resin and soak for 30min, filter and dry, repeat dipping in phenolic resin, filter and dry; repeat the above operation 4 times. Then the above products are stacked into a ceramic crucible and carbonized in a vacuum furnace. The carbonization temperature was 1200°C, and the carbonization time was 20 minutes. Then it was moved to a crucible covered with 8g of silicon powder, and the temperature was raised to 1550°C for silicification. The silicification time was 30 minutes, and finally a porous silicon carbide ceramic with a porosity of 60% was obtained.

Embodiment 3

[0017] A preparation method of rice husk stacked porous silicon carbide, the steps of which are as follows:

[0018] (1) Soak the rice husk in phenolic resin for 40 min, then filter it on a 400-mesh filter, and dry it at 150 °C for 60 min;

[0019] (2) Stacking and forming the impregnated, filtered and dried rice husks in a container to obtain a stacked product;

[0020] (3) Carbonize the stacked product in a vacuum furnace at a carbonization temperature of 300 °C and a carbonization time of 10 min to obtain a carbonized product;

[0021] (4) Put the carbonized product into a crucible, and then move it into a vacuum furnace for silicification. The silicification temperature is 1420 °C, and the silicification time is 10 min. The mass of silicon powder used in the silicification process is 3% of the mass of the carbonized product to obtain rice husk Stacked porous silicon carbide with a porosity of 30%.

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Abstract

The invention discloses a preparation method of rice hull stacked porous silicon carbide. The preparation method comprises the following steps: (1) soaking rice hulls in phenolic resin, filtering and drying; (2) stacking and forming the soaked, filtered and dried rice hulls in a container so as to obtain a stacked product; (3) carbonizing the stacked product in a vacuum furnace so as to obtain a carbonized product; (4) putting the carbonized product in a crucible, transferring to the vacuum furnace, and carrying out silicification so as to obtain rice hull stacked porous silicon carbide. The preparation method is characterized in that the agricultural wastes, namely the rice hulls are used as raw materials, soaked in the phenolic resin, filtered, dried, then stacked and formed; the stacked product is subjected to carbonization and silification in the vacuum furnace so as to obtain the porous or foam silicon carbide ceramic with porosity of 30-70%. The preparation method changes waste materials into things of value and belongs to the field of green ceramic. The obtained porous silicon carbide ceramic is high in porosity, adjustable in porosity, simple in method and suitable for industrial scale.

Description

technical field [0001] The invention relates to a preparation method of green porous silicon carbide, belonging to the technical field of ecological materials. Background technique [0002] The use of renewable materials to prepare ceramic materials has become one of the hot spots in the research of ceramic materials. In recent years, people have done a lot of research in this area. In summary, it can be divided into two categories: one is to use renewable materials as carbon sources or structural templates to prepare ceramic fibers. The other is the direct conversion of renewable materials into ceramics. [0003] Rice husk is a by-product of rice milling, accounting for about 20% of the total rice output. Currently, the annual output of rice husk in the world is more than 60 Mt. The main components of rice husk vary greatly due to different varieties, origins, and processing methods. Generally, its water content is about 12%, carbon content is 36%, nitrogen content is 0....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B38/00C04B35/622
Inventor 张小立
Owner ZHONGYUAN ENGINEERING COLLEGE
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