Method for preparing carbon fiber toughened silicon carbide wood-ceramics

A technology of wood ceramics and tough silicon carbide, which is applied in the field of preparation of silicon carbide wood ceramics, can solve the problems of easy deformation and cracking, large volume shrinkage, and poor toughness of products, and achieve simple and feasible process, overcome large volume shrinkage, and high elastic mold. volume effect

Inactive Publication Date: 2017-03-08
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing carbon fiber toughened silicon carbide wood ceramics, so as to overcome the problems of large volume shrinkage during carbonization of silicon carbide wood ceramic green bodies in the prior art, easy deformation and cracking during liquid phase siliconizing reaction, and poor product toughness. shortcoming

Method used

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Examples

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Embodiment 1

[0024] A method for preparing carbon fiber toughened silicon carbide wood ceramics, the steps are as follows:

[0025] (1) Put oak powder (with a particle size of 100 mesh), carbon fiber (with a length of 50 μm) and thermosetting phenolic resin powder (with a particle size of 100 mesh) into water to make a slurry; among them, in terms of parts by mass, 4 parts of wood powder , 6 parts of carbon fiber, 15 parts of thermosetting phenolic resin powder, 50 parts of water;

[0026] (2) Pour the slurry prepared in step (1) into a metal container, put it into a freeze dryer, freeze to -50°C under vacuum, and keep it for 30 minutes; raise the temperature to -10°C, and keep it for 30 minutes; continue to heat up to -5°C, keep warm for 30 minutes; continue to heat up to -1°C, keep warm until completely dry; release the vacuum, take it out, and get the carbon fiber reinforced body; in the whole process, heat up at a heating rate of 2°C / h;

[0027] (3) Pour the carbon fiber reinforced bo...

Embodiment 2

[0031] A method for preparing carbon fiber toughened silicon carbide wood ceramics, the steps are as follows:

[0032] (1) Put maple wood powder (with a particle size of 300 mesh), carbon fiber (with a length of 400 μm) and thermosetting phenolic resin powder (with a particle size of 500 mesh) into water to make a slurry; among them, in terms of parts by mass, wood powder 5 5 parts, 5 parts of carbon fiber, 20 parts of thermosetting phenolic resin powder, 60 parts of water;

[0033] (2) Pour the slurry prepared in step (1) into a metal container, put it into a freeze dryer, freeze to -40°C under vacuum, and keep it for 30 minutes; raise the temperature to -10°C, and keep it for 30 minutes; continue to heat up to -5°C, keep warm for 30 minutes; continue to heat up to -1°C, keep warm until completely dry; release the vacuum, take it out, and get the carbon fiber reinforced body; in the whole process, heat up at a heating rate of 3°C / h;

[0034] (3) Pour the carbon fiber reinfor...

Embodiment 3

[0038] A method for preparing carbon fiber toughened silicon carbide wood ceramics, the steps are as follows:

[0039] (1) Put peach wood powder (with a particle size of 200 mesh), carbon fiber (with a length of 200 μm) and thermosetting phenolic resin powder (with a particle size of 300 mesh) into water to make a slurry; among them, in terms of parts by mass, 6 parts of wood powder , 4 parts of carbon fiber, 15 parts of thermosetting phenolic resin powder, 50 parts of water;

[0040] (2) Pour the slurry prepared in step (1) into a metal container, put it into a freeze dryer, freeze to -30°C under vacuum, and keep it for 30 minutes; raise the temperature to -10°C, keep it for 30 minutes; continue to heat up to -5°C, keep warm for 30 minutes; continue to heat up to -1°C, keep warm until completely dry; release the vacuum, take it out, and get the carbon fiber reinforced body; in the whole process, heat up at a heating rate of 5°C / h;

[0041] (3) Pour the carbon fiber reinforced ...

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Abstract

The invention belongs to the field of preparation of silicon carbide wood ceramics and discloses a method for preparing carbon fiber toughened silicon carbide wood-ceramics. The method comprises the steps: putting 4-6 parts (in parts by mass) of wood flour, 4-6 parts of carbon fibers and 15-20 parts of thermosetting phenolic resin into a dissolution equivalent of water so as to prepare slurry, wherein the sum of parts (by mass) of the wood flour and parts (by mass) of the carbon fibers is 10 parts; pouring the prepared slurry into a metal container, and carrying out freeze drying in freeze drying equipment, so as to prepare a carbon fiber reinforcement; subjecting the prepared carbon fiber reinforcement to mold-pressing forming, so as to prepare biscuits; subjecting the prepared biscuits to carbonization and reacting siliconizing sequentially, thereby obtaining the carbon fiber toughened silicon carbide wood-ceramics. According to the method disclosed by the invention, the disadvantages of the silicon carbide wood ceramics in the prior art that the volume shrinkage is high during the carbonization of the biscuits, deformation and cracking are easy, and the toughness of products is poor are overcome, the involved raw materials are readily available, and the process is simple and feasible.

Description

technical field [0001] The invention belongs to the field of preparation of silicon carbide wood ceramics, in particular to a preparation method of carbon fiber toughened silicon carbide wood ceramics. Background technique [0002] Woody silicon carbide ceramic material is a new type of ceramic material with specific structure and performance obtained from woody materials (wood, wood powder, crop straw, etc.) through organic to inorganic transformation. The basic preparation process of woody silicon carbide ceramics can be divided into three steps: preparation of lignin green body, carbonization of lignin green body and reaction siliconizing. At present, the main technical routes for preparing woody silicon carbide ceramics are: (1) direct carbonization of wood to make carbon templates, and silicon carbide ceramic materials are produced through liquid phase siliconization reaction. Due to the low density of wood itself and the existence of anisotropic and complex structures ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/573
CPCC04B35/806C04B35/573C04B35/62209C04B2235/48C04B2235/5248C04B2235/526C04B2235/77C04B2235/96
Inventor 张东生吴恒姚栋嘉刘喜宗杨超牛利伟
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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