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Preparation method of high-strength anti-contact-damage porous SiC

A high-strength, high-temperature treatment technology, applied in the field of high-temperature-resistant porous ceramics, can solve the problems that the shape of the wood template cannot be completely maintained, the bionic porous SiC is brittle, and the consumption of the porous oak template can achieve excellent contact damage resistance and high compression. Effect of strength, high compressive strength and resistance to contact damage

Active Publication Date: 2013-09-25
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Application Information

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Problems solved by technology

Document [1] (J.Am.Ceram.Soc., 82 (11) 3251-3253 (1999)) provides a kind of method that liquid molten Si is impregnated in wood template and prepares biomimetic porous SiC ceramics, the shortcoming of this method There is a large amount of unreacted residual Si
Literature [2] (J.Eur.Ceram.Soc., 22, 2663-2668 (2002)) provides a method for preparing biomimetic porous SiC ceramics by impregnating Si vapor into wood templates. The disadvantage of this method is that the reaction preparation The temperature of SiC is high, the porous wood template changes during the SiC synthesis process, and the morphology of the wood template cannot be completely maintained
Literature [3] (J.Am.Ceram.Soc., 84 (6) 1236-1239 (2001)) provides a method for preparing bionic porous SiC ceramics by reacting gaseous SiO with carbonized oak templates. The carbon in the porous oak template is consumed during the reaction, and the pore structure will be destroyed
Document [4] (J.Am.Ceram.Soc., 87(5)784-93(2004)) provides a method of impregnating silica sol into a porous wood template and then preparing biomimetic porous SiC ceramics by carbon thermal reduction of ceramics. method, the disadvantage of this method is that the obtained biomimetic porous SiC is relatively brittle

Method used

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  • Preparation method of high-strength anti-contact-damage porous SiC
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  • Preparation method of high-strength anti-contact-damage porous SiC

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Bamboo with a size of 30mmx20mmx15mm was heated to 900°C at 2°C / min, and carbonized under the protection of argon for 2 hours to obtain a porous carbon template. Use liquid polycarbosilane with a viscosity of 7.8 poise to impregnate under vacuum at room temperature (20°C-28°C) for 3 days, increase the weight by 80% after impregnation, and then cure at 200°C for 2 hours. The impregnated and cured sample was heated to 1100°C at a rate of 10°C / min, and cracked for 5 hours under the protection of argon to obtain biomimetic porous SiC ceramics.

[0033] The porosity of the porous SiC ceramic is 88%. X-ray diffraction analysis, the main components are uncrystallized SiC and carbonized bamboo templates, such as figure 1 (b) shows the X-ray diffraction pattern of the porous SiC material prepared in this example.

Embodiment 2

[0035] Heat pine wood with a size of 30mmx20mmx15mm at 2.5°C / min to 1000°C, and carbonize it under the protection of argon for 5 hours to obtain a porous carbon template. After dipping for 5 days, the weight increased by 83% after dipping, and then cured at 240°C for 2 hours. The impregnated and cured sample was heated to 1200°C at a rate of 10°C / min, and cracked for 5 hours under the protection of helium to obtain biomimetic porous SiC ceramics.

[0036] The porosity of the porous SiC ceramic is 76%. X-ray diffraction analysis, the main components are nanoscale SiC and carbonized pine templates, such as figure 1 (c) shows the X-ray diffraction pattern of the porous SiC material prepared in this example. The compressive strength test shows that the average compressive strength of the biomimetic porous SiC ceramics prepared under this condition is 36.5MPa.

Embodiment 3

[0038] Heat pine wood with a size of 40mmx20mmx25mm at 2°C / min to 1000°C, and carbonize it under the protection of argon for 5 hours to obtain a porous carbon template. After dipping for 6 days, the weight increased by 85% after dipping, and then cured at 240°C for 2 hours. The impregnated and cured sample was heated to 1300°C at a rate of 15°C / min, and cracked for 6 hours under the protection of argon to obtain biomimetic porous SiC ceramics.

[0039] The porosity of the porous SiC ceramic is 77%. X-ray diffraction analysis, the main components are nanoscale SiC and carbonized pine templates, such as figure 1 (d) shows the X-ray diffraction pattern of the porous SiC material prepared in this example. The compressive strength test shows that the average compressive strength of the biomimetic porous SiC ceramics prepared under this condition is 35MPa.

[0040] Scanning electron microscope pictures and energy spectra such as figure 2 As shown, the pore size is 15-20 μm, and...

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Abstract

The invention relates to a preparation method of high-strength anti-contact-damage porous SiC, which comprises the following steps: (1) carbonizing wood at 600-1100 DEG C in an inert gas or hydrogen atmosphere for 1-6 hours; (2) carrying out dipping treatment on the carbonized wood in liquid polycarbosilane in a vacuum environment to obtain a carbon template; (3) curing the carbon template subjected to dipping treatment at 180-250 DEG C for 1-5 hours; and (4) carrying out high-temperature treatment on the cured carbon template in an inert gas or hydrogen atmosphere or in a vacuum environment to obtain the porous SiC ceramic. The method provided by the invention can reserve the porous structure in the wood template, so that the porous SiC can still have high compression strength under the condition of high porosity and also have excellent anti-contact-damage capacity.

Description

technical field [0001] The invention belongs to the field of high-temperature-resistant porous ceramics, and relates to a preparation method of high-strength, contact-damage-resistant porous SiC. Background technique [0002] Compared with dense ceramics, porous ceramics have many special properties, such as low density, good thermal insulation performance, high specific surface area, high gas permeability and high temperature stability. Therefore, they are widely used in fields such as thermal insulation, metal filtration, water treatment and catalysis. Recently, due to its unique pore morphology and complex multilayer morphology, pine wood is often used as a biomimetic template to prepare porous ceramic materials. In particular, the oriented arrangement of tracheids in pine wood is beneficial as a template for the preparation of oriented porous materials. Biomimetic porous SiC ceramics are porous SiC ceramics prepared from natural biological materials as templates. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/565
Inventor 周延春王晓飞卢新坡陶孟胡继东孙新冯志海
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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