Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of silicon carbide fiber lightweight high-temperature heat insulation material and its preparation method

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

Active Publication Date: 2017-07-28
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
View PDF3 Cites 0 Cited by
  • 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, so they are not suitable for high-strength materials. field
Silicon carbide or porous ceramics with silicon carbide as the main component are common temperature-resistant materials, such as various oxides combined with silicon carbide, recrystallized silicon carbide, etc., but these materials have high density, high thermal conductivity, and thermal insulation performance. very limited

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of silicon carbide fiber lightweight high-temperature heat insulation material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0022] (2) The fiber slurry is poured into the suction filtration device in batches for 3 times, and the suction filtration is slow, so that the residence time of the fibers in the solution is 5 minutes, and the degree of distribution of the fibers 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-treat at 60°C for 10 hours, and remove the solvent in the filter cake;

[0024] (4) Put the dried filter cake into a muffle furnace, heat-treat at 180° C. for 3 hours, and make the polymethylsilsesquioxane cross-linked and solidified;

[0025] (5) Put the material in (4) into a high-temperature furnace, and heat-t...

Embodiment 2

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

[0030] (2) Mix 120g of chopped silicon carbide fiber and 10g of quartz fiber with 100g of absolute ethanol into (1), stir vigorously for 20min to obtain a ceramic fiber slurry;

[0031] (3) The fiber slurry is poured into the suction filtration device in batches for 3 times, and the suction filtration is slow, so that the residence time of the fibers in the solution is 6 minutes, and the degree of distribution of the fibers 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 filter cake of (3) into an oven, heat-treat at 80° C. for 4 hours, and remove excess solvent;

[0033] (5) Put the dried filter cake into a muffle furnace, and heat-treat at 240° C. for 4 hours to cross-link and solidify the polycarbosilane;

[0034] (6) Put the material in (5) into a high-tem...

Embodiment 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, and stir vigorously for 25min to make it evenly mixed to obtain ceramic fiber slurry;

[0038] (2) The fiber slurry is poured into the suction filtration device in batches 5 times, and the suction filtration is slow, so that the residence time of the fibers in the solution is 8 minutes, and the degree of distribution of the fibers 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-treat at 110° C. for 4 hours, and remove excess solvent;

[0040] (4) Put the dried filter cake into a muffle furnace, and heat-treat 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 i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a silicon carbide fiber light-weight high-temperature heat insulation material and a preparation method thereof, belonging to the field of inorganic materials. The lightweight silicon carbide ceramic material in the present invention uses silicon carbide fiber as the main raw material, silicone resin or polycarbosilane as the binder, and adopts a process combining suction filtration molding and high-temperature ceramicization to prepare porous silicon carbide ceramics. The silicon carbide fibers in the obtained porous silicon carbide ceramic material are arranged along the plane direction, and are bonded together by SiOC or SiC formed after ceramicization of silicone resin or polycarbosilane, and have good mechanical properties and thermal insulation properties.

Description

technical field [0001] The invention discloses a silicon carbide fiber light-weight high-temperature heat insulation material and a preparation method thereof, which belong to the technical field of inorganic materials and can be used for heat protection of high-temperature equipment or devices. Background technique [0002] Lightweight high-temperature insulation materials have extensive and important uses in aviation, aerospace, metallurgy, nuclear energy and other fields. Foam ceramics, ceramic fiber felts and carbon fiber felts are common high-temperature heat insulation materials. 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, so...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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