Method for preparing silicon carbide woodceramics

A technology for wood ceramics and silicon carbide, applied in the field of preparing silicon carbide wood ceramics, can solve the problems of limited mechanical properties, low ceramic density, large structural fluctuation, etc., and achieves the effects of simple and easy process, easy availability of raw materials and low cost.

Active Publication Date: 2009-10-28
THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME
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Problems solved by technology

However, research results and reaction sintering theory show that the technology of preparing SiC wood-based ceramics from the above-mentioned wood materials does not have practical application value: wood is a natural porous material, and its pore size has a wide distribution due to the complexity of its microstructure. ; and due to the differences in the growth environment of the tree, the trunk of the wood, etc., the pore size distribution has great variability, and the existence of some structural defects also leads to changes in the pore size distribution and pore characteristics.
When wood is directly used to prepare SiC wood cera

Method used

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  • Method for preparing silicon carbide woodceramics
  • Method for preparing silicon carbide woodceramics

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Example Embodiment

[0020] Example 1. Preparation of silicon carbide wood ceramics

[0021] (1) Crush poplar wood to 400 mesh;

[0022] (2) Dry 400 mesh poplar wood powder to a moisture content of 5% (mass percentage);

[0023] (3) The above poplar wood powder is formed by hot pressing in a metal mold with a plate vulcanizing machine. The molding temperature is 155℃ and the molding time is 25 minutes to obtain a density of 0.95g / cm. 3 的体体;

[0024] (4) Carbonizing the above-mentioned body at 1200°C for 2 hours to obtain a carbon blank, the density of the carbon blank is 0.80g / cm 3 ;

[0025] (5) The above-mentioned carbon billet is subjected to liquid phase siliconizing at a vacuum of 30 Pa and a temperature of 1600° C. to obtain silicon carbide wood ceramic 1.

[0026] figure 1 with figure 2 They are the pore size distribution diagram of the carbon blank and the optical microstructure diagram of the silicon carbide wood ceramics.

[0027] The density test of the prepared silicon carbide wood ceram...

Example Embodiment

[0029] Example 2. Preparation of silicon carbide wood ceramics

[0030] (1) Crush the white pine wood to 300 mesh;

[0031] (2) Adjust the humidity of the white pine wood powder to a moisture content of 35% (mass percentage);

[0032] (3) The above-mentioned wood flour is made into a density of 0.90g / cm at a temperature of 185℃ by continuous rolling method. 3 The sheet;

[0033] (4) Carbonizing the above board at 1500°C for 2 hours to obtain a carbon billet, the density of the carbon billet is 0.76g / cm 3 ;

[0034] (5) The above-mentioned carbon billet is subjected to vapor phase siliconizing at a temperature of 1750° C. under a vacuum condition of 10 Pa to obtain silicon carbide wood ceramic 2.

[0035] The density test of the prepared silicon carbide wood ceramic 2 was carried out by Archimedes drainage method, and the bending strength was tested according to the national standard GB / T 6569-2006 (fine ceramic bending strength test method). The fracture toughness was tested by un...

Example Embodiment

[0037] Example 3. Preparation of silicon carbide wood ceramics

[0038] (1) Crush poplar wood to 800 mesh;

[0039] (2) Dry 800 mesh poplar wood powder to a moisture content of 0% (mass percentage);

[0040] (3) The above poplar wood powder is formed by hot pressing in a metal mold with a plate vulcanizing machine at a molding temperature of 250°C and a molding time of 25 minutes to obtain a density of 0.80g / cm 3 的体体;

[0041] (4) Carbonizing the above-mentioned body at 1600°C for 2 hours to obtain a carbon blank, the density of the carbon blank is 0.65g / cm 3 ;

[0042] (5) The above-mentioned carbon billet is subjected to liquid phase siliconizing at a vacuum degree of 0.1 Pa and a temperature of 1450° C. to obtain silicon carbide wood ceramic 3.

[0043]The density test of the prepared silicon carbide wood ceramic 3 was carried out by Archimedes drainage method, and the bending strength was tested in accordance with the national standard GB / T 6569-2006 (Fine Ceramic Bending Stre...

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Abstract

The invention discloses a method for preparing silicon carbide woodceramics. The method comprises the steps of carbonizing billets prepared by wood powder with fineness of 100 meshes to 800 meshes to obtain carbon billets; and using a liquid phase siliconizing method or a gas phase siliconizing method for leading the carbon billets and the carbon to prepare the silicon carbide woodceramics. The billet body is prepared by hot-press forming or roll forming of the wooden powder. The water content of the wooden power is 0-80g100g. The temperature of the hot-press forming or roll forming is 120 DEG C to 220 DEG C and the temperature of carbonization is 600 DEG C to 1600 DEG C. The method for preparing the silicon carbide woodceramics has easy-available raw materials, simple and easy technique and controllable ceramic structure, and can prepare the silicon carbide woodceramics with high mechanical property and high reliability.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide wood ceramics. Background technique [0002] Silicon carbide ceramics is an important material system in engineering ceramics. It can be prepared by a variety of sintering processes, including pressureless sintering, hot pressing sintering, isostatic pressing sintering and reaction sintering. Among them, the reaction sintering process has a low sintering temperature. , short reaction time, low requirements for raw material purity, and the ability to prepare products with complex shapes, etc., so it is a low-cost and widely applicable silicon carbide ceramic preparation process. [0003] In the past ten years, wood materials have also been used in the reaction sintering process to prepare silicon carbide ceramics (called SiC wood ceramics). The method is to use wood, MDF and wood powder / resin-based composite materials as wood bodies Porous carbon blanks were obtained by pyrolysis under the...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/565
Inventor 严自力马天张建春周中磊张华郝新敏
Owner THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME
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