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A kind of ceramic matrix composite material and its preparation method and application

A composite material and ceramic-based technology, which is applied in the direction of mechanical equipment, machine/engine, engine components, etc., can solve the problems of inability to guarantee the thermal stability of the ceramic matrix, inability to use it for a long time, poor high-temperature thermal stability, etc., and achieve flexible composition design High performance, excellent thermal stability, good mechanical strength and fracture toughness

Active Publication Date: 2022-03-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In early studies, domestic scholars mostly used silica sol and alumina sol as raw materials for ceramic substrates. Although silica sol and alumina sol have high sintering activity and can be sintered below 1200°C, they are thermally stable at high temperatures. Poor performance, cannot be used for a long time in a high temperature environment above 1000 ℃
After that, some researchers combined nano-ceramic powders with ceramic precursors to solve the sintering problem of ceramic substrates, but the thermal stability of ceramic substrates in high-temperature environments could not be guaranteed either.

Method used

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  • A kind of ceramic matrix composite material and its preparation method and application
  • A kind of ceramic matrix composite material and its preparation method and application
  • A kind of ceramic matrix composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of ceramic matrix composite material, its preparation method comprises the following steps:

[0044] 1) Add 10g of polyvinyl alcohol and 5g of sodium silicate into 200mL of water, stir to dissolve, and then add 20g of D 50 20nm alumina powder, 40g of D 50 200nm alumina powder and 40g of D 50 Alumina powder of 2 μm is ball milled to obtain ceramic slurry;

[0045] 2) Brush the ceramic slurry onto the alumina fiber cloth, and then dry it in an oven at 60°C for 2 hours to obtain a prepreg cloth, then stack the prepreg cloth into a metal mold, and place the prepreg cloth under a pressure of 2MPa and a temperature of 100°C The composite material green body was obtained by laminating under the conditions for 1 hour, and then the composite material green body was cured in an oven at 200°C for 1 hour, then pyrolyzed in a muffle furnace at 500°C for 6 hours, and pre-fired at 900°C for 2 hours to obtain a pre-fired sample;

[0046] 3) Put the pre-fired sample in a pres...

Embodiment 2

[0050] A kind of ceramic matrix composite material, its preparation method comprises the following steps:

[0051] 1) Add 10g of hydroxymethyl cellulose and 50g of silica sol with a mass fraction of 20% into 200mL of water, stir to dissolve, and then add 50g of D 50 200nm alumina powder and 50g of D 50 Alumina powder of 1 μm is ball milled to obtain ceramic slurry;

[0052] 2) Brush the ceramic slurry onto the alumina fiber cloth, and then dry it in an oven at 60°C for 2 hours to obtain a prepreg cloth, then stack the prepreg cloth into a metal mold, and place the prepreg cloth under a pressure of 2MPa and a temperature of 100°C The composite material green body was obtained by laminating under the conditions for 1 hour, and then the composite material green body was cured in an oven at 200°C for 1 hour, then pyrolyzed in a muffle furnace at 500°C for 6 hours, and pre-fired at 900°C for 2 hours to obtain a pre-fired sample;

[0053] 3) Put the pre-fired sample in a pressure...

Embodiment 3

[0062] A kind of ceramic matrix composite material, its preparation method comprises the following steps:

[0063] 1) Add 10g of polyvinylpyrrolidone and 50g of aluminum sol with a mass fraction of 20% into 200mL of water, stir to dissolve, and then add 50g of D 50 200nm alumina powder and 50g of D 50 Alumina powder of 1.5 μm is ball milled to obtain ceramic slurry;

[0064] 2) Brush the ceramic slurry onto the alumina fiber cloth, and then dry it in an oven at 60°C for 2 hours to obtain a prepreg cloth, then stack the prepreg cloth into a metal mold, and place the prepreg cloth under a pressure of 2MPa and a temperature of 100°C The composite material green body was obtained by laminating under the conditions for 1 hour, and then the composite material green body was cured in an oven at 200°C for 1 hour, then pyrolyzed in a muffle furnace at 500°C for 6 hours, and pre-fired at 900°C for 2 hours to obtain a pre-fired sample;

[0065] 3) Put the pre-fired sample in a pressur...

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Abstract

The invention discloses a ceramic matrix composite material, a preparation method and application thereof. The preparation method of the ceramic matrix composite material of the present invention comprises the following steps: preparing an organic binder, an inorganic binder and ceramic powders of different grades into a ceramic slurry, and then coating the fiber cloth with the ceramic slurry and performing layering After pressing and pre-firing, in-situ cross-linking and sintering are performed after impregnating the ceramic precursor solution. The ceramic slurry in the present invention can be matched with a variety of continuous fibers, effectively impregnated between fiber bundles and inside fiber bundles, and combined with ceramic precursor vacuum-pressure impregnation-in-situ crosslinking process, the oxide ceramic matrix can be made Effectively sintered at a temperature lower than 1200°C, the prepared ceramic matrix composite can retain more than 80% of its bending strength when placed in an air environment at 1100°C for 1000 hours.

Description

technical field [0001] The invention relates to the technical field of ceramic matrix composite materials, in particular to a ceramic matrix composite material and its preparation method and application. Background technique [0002] Ceramic matrix composites have low density, excellent thermal stability and oxidation resistance, and lower production costs than metal materials, and have attracted much attention in recent years. Continuous fiber reinforced ceramic matrix composites are mainly composed of continuous fiber and ceramic matrix. Common continuous fibers include carbon fiber, oxide ceramic fiber, silicon carbide fiber, silicon nitride fiber, etc. The ceramic matrix can be divided into non-oxide ceramic matrix according to its composition. (for example: silicon carbide, zirconium carbide, zirconium boride, hafnium boride, and composite ceramics composed of the former ceramics, etc.) and oxide ceramic substrates (for example: silicon oxide, aluminum oxide, mullite, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/117C04B35/80C04B35/622C04B35/14C04B35/46C04B35/488C04B35/053C04B35/057C04B35/505F01D25/00
CPCC04B35/117C04B35/622C04B35/14C04B35/46C04B35/488C04B35/4885C04B35/053C04B35/057C04B35/505F01D25/005C04B2235/3427C04B2235/3201C04B2235/3418C04B2235/3218C04B2235/3244C04B2235/5454C04B2235/5445C04B2235/5436C04B2235/5256C04B2235/5224C04B2235/5248C04B2235/5244C04B2235/524C04B2235/5232C04B2235/5236C04B2235/616C04B2235/656C04B2235/6567C04B2235/96
Inventor 张勃兴李豪邱文丰
Owner SOUTH CHINA UNIV OF TECH
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