Silicon carbide fiber lightweight high-temperature insulating material, and preparation method thereof

A technology of silicon carbide fiber and thermal insulation material, which is applied in the thermal protection of high-temperature equipment or devices, silicon carbide fiber lightweight high-temperature thermal insulation material and the field of preparation thereof, can solve the problem of poor thermal insulation performance, poor mechanical performance and thermal insulation performance. limited and other problems, to achieve the effect of good thermal insulation performance, low total thermal conductivity, and improved mechanical properties

Active Publication Date: 2015-09-16
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foamed ceramics are cheap and easy to prepare, but they have high thermal conductivity, poor thermal insulation performance, and high density.
Ceramic fiber felts, such as aluminum silicate fiber felts, mullite fiber felts, etc. have better thermal insulation performance than foam ceramics, but the disadvantage is that ceramic fiber products are flexible and have poor mechanical properties

Method used

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  • Silicon carbide fiber lightweight high-temperature insulating material, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] (1) Mix 100g of chopped silicon carbide fibers with 500g of absolute ethanol, add 20g of polymethylsilsesquioxane, transfer to a mixer, and stir vigorously for 20 minutes to mix evenly to obtain ceramic fiber slurry;

[0022] (2) Pour the fiber slurry into the suction filtration device three times in batches, and filter slowly, so that the residence time of the fibers in the solution is 5 minutes, and the degree of fiber distribution in the filter cake along the plane direction is improved; after completion, Press the filter cake on the press to a thickness of 22mm;

[0023] (3) Put the filter cake in (2) into an oven, heat treatment at 60°C for 10 hours to remove the solvent in the filter cake;

[0024] (4) Put the dried filter cake into a muffle furnace and heat it at 180°C for 3 hours to crosslink and solidify the polymethylsilsesquioxane;

[0025] (5) Put the material in (4) into a high-temperature furnace and heat-treat it in an argon atmosphere at 1000°C...

Example Embodiment

[0028] Example 2

[0029] (1) Mix 30g of polycarbosilane with 9g of divinylbenzene, add 250mL of xylene, stir and mix well;

[0030] (2) Mix 120g chopped silicon carbide fibers and 10g quartz fibers with 100g absolute ethanol and add them to (1), stir vigorously for 20 minutes to obtain ceramic fiber slurry;

[0031] (3) Pour the fiber slurry into the suction filtration device three times in batches, and filter slowly, so that the residence time of the fibers in the solution is 6 minutes, and the degree of fiber distribution in the filter cake along the plane direction is improved; after completion, Press the filter cake on the press to a thickness of 18mm;

[0032] (4) Put the (3) filter cake in an oven, heat treatment at 80°C for 4 hours to remove excess solvent;

[0033] (5) Put the dried filter cake into a muffle furnace and heat it at 240°C for 4 hours to crosslink and solidify the polycarbosilane;

[0034] (6) Put the material in (5) into a high-temperature furnace and heat-treat ...

Example Embodiment

[0036] Example 3

[0037] (1) Mix 300g of chopped silicon carbide fiber and 50g of alumina fiber with 3500g of absolute ethanol, add 650g of polymethylsilsesquioxane, transfer to a mixer, stir vigorously for 25 minutes to mix evenly, and obtain ceramic fiber Slurry

[0038] (2) Pour the fiber slurry into the suction filtration device in batches for 5 times, and filter slowly, so that the residence time of the fiber in the solution is 8 minutes, and the degree of fiber distribution in the filter cake along the plane direction is improved; after completion, Press the filter cake on the press to a thickness of 32mm;

[0039] (3) Put the filter cake in an oven, heat treatment at 110°C for 4 hours to remove excess solvent;

[0040] (4) Put the dried filter cake into a muffle furnace, heat treatment at 300°C for 5 hours to crosslink and solidify the polymethylsilsesquioxane;

[0041] (5) Put the material in (4) into a high-temperature furnace and heat-treat it in an argon atmosphere at 1200...

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Abstract

The invention relates to a silicon carbide fiber lightweight high-temperature insulating material, and a preparation method thereof, and belongs to the field of inorganic material. According to the preparation method, silicon carbide fiber is taken as a main raw material of a lightweight silicon carbide ceramic material, silicon resin or polycarbosilane is taken as a binder, suction filtration moulding and high temperature ceramization are combined, and porous silicon carbide ceramic is prepared. Silicon carbide fiber is arranged along a plane direction in the porous silicon carbide ceramic, is bond together via SiOC or SiC obtained via silicon resin or polycarbosilane ceramization, and possesses excellent mechanical properties and heat insulation performance.

Description

Technical field [0001] The invention discloses a silicon carbide fiber lightweight high-temperature thermal insulation material and a preparation method thereof, belonging to the technical field of inorganic materials, and can be used for thermal protection of high-temperature equipment or devices. Background technique [0002] Lightweight high-temperature insulation materials have a wide range of important applications in aviation, aerospace, metallurgy, nuclear energy and other fields. Foam ceramics, ceramic fiber felts and carbon fiber felts are common high-temperature insulation materials. Foam ceramics are cheap and simple in preparation process, but their thermal conductivity is high, heat insulation performance is poor, and the density is high. Ceramic fiber felts, such as aluminum silicate fiber felts, mullite fiber felts and other thermal insulation performance are better than foam ceramics, but the disadvantage is that ceramic fiber products are flexible and have poor m...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/80C04B35/565
Inventor 李俊宁胡子君孙陈诚王晓婷杨海龙周洁洁
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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