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Preparation method of wheat straw layered silicon carbide ceramics

A technology of silicon carbide ceramics and carbonized prefabricated parts, which is applied in the field of green environmental protection, can solve the problems of not being easy to soil, large and not easy to rot, and affecting crop growth, etc., and achieve the effect of simple process, high added value and high strength

Inactive Publication Date: 2015-08-19
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, wheat straw was used as fuel in rural areas, but now every household uses gas stoves and rice cookers. There is no need for wheat straw to burn stoves, and it is unrealistic to return all wheat straw to the field. The weight of wheat straw is light, and it is not big after returning The crops in the late stage of replanting are not easy to land on the soil, and the amount is too large and not easy to rot, which will affect the growth of the next season's crops

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The straw is woven and laminated, the number of layers is 10, shaped and fixed on the hydraulic press, and then the laminate is put into phenolic resin for impregnation to obtain a prefabricated part; the above prefabricated parts are put into a vacuum furnace, and the bottom is covered with prefabricated parts Si powder with 5% mass of Si powder is sprinkled into the upper part of Si powder with 5% mass of the preform, and then carbonized, the carbonization temperature is 1050°C, and the time is 40min; for 40min. Finally, straw layered silicon carbide ceramics are obtained. The strength is 20MPa.

Embodiment 2

[0021] After weaving the straw and stacking, the number of layers is 20, shaped and fixed on the hydraulic press, and then the laminate is put into phenolic resin for impregnation to obtain the prefabricated part; the above prefabricated part is put into the vacuum furnace for carbonization, and the carbonization temperature is 1050°C for 40 minutes; then put the carbonized preform into phenolic resin again for impregnation, take it out and put it in a vacuum furnace to prepare for silicification, and spread 5% of the mass of the preform on the bottom of the above preform Si Powder, the upper part is sprinkled with 5% Si powder of the mass of the preform, and then continues to heat up to 1550°C in the vacuum furnace to carry out the silicification reaction, and the reaction time is 40min. Finally, straw layered silicon carbide ceramics were obtained with a strength of 55MPa.

Embodiment 3

[0023] (1) Weaving or arranging the straw into sheets, then stacking the sheets of straw one by one, and fixing them on the hydraulic press to obtain the laminated straw;

[0024] (2) impregnating the laminated straws in phenolic resin, the quality of which is 40% of the mass of the straws used to prepare the laminates, to make a prefabricated part;

[0025] (3) Put the preform into a vacuum furnace, and carry out carbonization under the condition of 1300 ℃, and the carbonization time is 50 minutes, and obtain the carbonized preform;

[0026] (4) Spread Si powder on the bottom of the vacuum furnace, the quality of the bottom Si powder is 2% of the mass of the carbonized preform, put the carbonized preform, and then sprinkle Si powder on the top of the carbonized preform, and the quality of the top Si powder is carbonized prefabricated 2% of the mass of the piece, siliconized at 1450°C for 20 minutes, and obtained straw layered silicon carbide ceramics with a strength of 80MPa....

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Abstract

The invention discloses a preparation method of a wheat-straw layered silicon carbide ceramic. The preparation method disclosed by the invention comprises the following steps of: (1) weaving or packing wheat-straws to form laminar wheat-straws, then, overlapping the laminar wheat-straws layer by layer, sizing and fixing on an oil press, thus obtaining overlapped wheat-straws; (2) putting the overlapped wheat-straws in phenolic resin to be immersed, and preparing a prefabricated part; (3) putting the prefabricated part in a vacuum furnace, carbonizing at 700-1300 DEG C, and obtaining a carbonized prefabricated part; and (4) paving Si powder at the bottom of the vacuum furnace, putting the carbonized prefabricated part in the vacuum furnace, then, spreading Si powder on the top of the carbonized prefabricated part, siliconing at 1450-1800 DEG C, thus obtaining the wheat-straw layered silicon carbide ceramic. According to the invention, after being overlapped, wheat-straws are immersed through phenolic resin; then, the wheat-straw layered silicon carbide ceramic is obtained through the vacuum carbonizing and siliconing methods; the preparation method disclosed by the invention is simple in process; scale production is realized; the wheat-straw layered ceramic has the morphology and the structure of wheat-straws through inheritance; and the wheat-straw layered silicon carbide ceramic disclosed by the invention has higher intensity, which can achieve 5-120 MPa.

Description

technical field [0001] The invention relates to a preparation method of green ceramics, belonging to the field of green environmental protection. 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] Most of the existing wheat stalks are treated by farmers using incineration. However, the open-air burning of straw has a serious impact on the atmospheric environment. The smoke generated by burning contains a large amount of harmful gases such as carbon monoxide and carbon dioxide, which affects human health; the smoke generated by burning straw will reduce the visibility o...

Claims

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Application Information

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