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Preparation method of carbon fiber powder reinforced silicon nitride-based composite material

A carbon fiber powder and silicon nitride-based technology, which is applied in the preparation of silicon nitride-based composite materials, can solve the problems of matrix compatibility limitation, difficulty in sintering densification, complicated whisker or fiber dispersion process, etc., and achieves convenient operation , Improving the interface bonding state, improving the toughness and flexural strength

Active Publication Date: 2017-12-26
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that whiskers or fibers can greatly increase Si 3 N 4 Fracture toughness, but its practical application is limited due to the complexity of the dispersion process of whiskers or fibers, the difficulty of sintering densification and the compatibility with the matrix

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of carbon fiber powder reinforced silicon nitride-based composite material, the steps are as follows:

[0022] (1) Disperse the liquid phenolic resin (50 wt% solid content) in absolute ethanol to ensure that the liquid phenolic resin content in the dispersion is 8 wt%;

[0023] (2), press Si 3 N 4 The mass ratio of powder (average diameter 5 μm) to absolute ethanol is 1:1, Si 3 N 4 Add the powder to the solution obtained in step (1), heat and stir at 50 °C to make it even;

[0024] (3), according to carbon fiber powder (length 45μm) and Si 3 N 4 The mass ratio of the powder is 0.15:1. Add the carbon fiber powder into the solution obtained in step (2), and continue stirring at 70°C until the slurry becomes too thick to stir;

[0025] (4) Put the slurry in a drying oven and dry at 70°C; granulate and pass through a 60-mesh sieve, put the powder in a mold, and press at 200MPa to obtain a green body;

[0026] (5) Coat the green body with a mixtur...

Embodiment 2

[0029] A preparation method of carbon fiber powder reinforced silicon nitride-based composite material, the steps are as follows:

[0030] (1) Disperse the liquid phenolic resin (50 wt% solid content) in absolute ethanol to ensure that the liquid phenolic resin content in the dispersion is 6 wt%;

[0031] (2), press Si 3 N 4 The mass ratio of powder (average diameter 5 μm) to absolute ethanol is 0.5:1, Si 3 N 4 Add powder to the solution obtained in step (1), heat and stir at 40 °C to make it even;

[0032] (3), according to carbon fiber powder (length 30μm) and Si 3 N 4 The mass ratio of the powder is 0.1:1. Add the carbon fiber powder into the solution obtained in step (2), and continue stirring at 60°C until the slurry becomes too thick to stir;

[0033] (4) Put the slurry in a drying oven and dry at 60°C; after granulating through an 80-mesh sieve, put the powder in a mold, and press it at 250MPa to obtain a green body;

[0034] (5) Coat the green body with a mixtur...

Embodiment 3

[0037] A preparation method of carbon fiber powder reinforced silicon nitride-based composite material, the steps are as follows:

[0038] (1) Disperse the liquid phenolic resin (50 wt% solid content) in absolute ethanol to ensure that the liquid phenolic resin content in the dispersion is 10 wt%;

[0039] (2), press Si 3 N 4 The mass ratio of powder (average diameter 5 μm) to absolute ethanol is 1.2:1, Si 3 N 4 Add the powder to the solution obtained in step (1), heat and stir at 60 °C to make it even;

[0040] (3), according to carbon fiber powder (length 50μm) and Si 3 N 4 The mass ratio of the powder is 0.2:1. Add the carbon fiber powder into the solution obtained in step (2), and continue stirring at 80°C until the slurry becomes too thick to stir;

[0041] (4) Put the slurry in a drying oven and dry it at 80°C; after granulating through a 100-mesh sieve, put the powder in a mold and press it at 150MPa to obtain a green body;

[0042] (5) Coat the green body with a...

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Abstract

The invention belongs to the field of preparation of a silicon nitride-based composite material, and discloses a preparation method of a carbon fiber powder reinforced silicon nitride-based composite material. The liquid phenolic resin is dispersed in anhydrous ethanol; Si3N4 powder is added into an obtained solution and is stirred uniformly at 40-60 DEG C; carbon fiber powder is added into the obtained solution, and stirring is continued at 60-80 DEG C until the slurry is thick and cannot be stirred; the slurry is dried, granulated and sieved, the obtained particle powder is placed in a mold and pressed and formed to obtain a green body; the green body is covered by mixed powder of silica powder and titanium powder, and then is placed in a graphite crucible to react in vacuum of 1550 to 1650 DEG C for 1 to 3h, thus the carbon fiber reinforced silicon nitride-based composite material is obtained. The preparation method has the advantages of simple process, convenient operation and the like, the C / Si3N4 has the advantages of carbon fiber and silicon nitride at the same time, and the shortcomings of larger brittleness of Si3N4 and the like are overcome.

Description

technical field [0001] The invention belongs to the field of preparation of silicon nitride-based composite materials, and in particular relates to a preparation method of carbon fiber powder reinforced silicon nitride-based composite materials. Background technique [0002] Carbon fiber has a series of excellent properties such as low density, high specific strength, high specific modulus, and high temperature resistance. One of its important applications is as a reinforcement for composite materials to carry loads. Silicon nitride has the advantages of high strength, high temperature resistance, oxidation resistance, corrosion resistance, thermal shock resistance and low thermal expansion coefficient, and is widely used in thermal structural materials. It is widely used in the matrix of wave-transparent materials and high-temperature-resistant wave-absorbing materials, but it still has the common disadvantage of high brittleness of ceramic materials. The fatal weakness of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/584C04B35/634
CPCC04B35/584C04B35/63476C04B35/806C04B2235/48C04B2235/5248C04B2235/96
Inventor 孙卫康董会娜张东生姚栋嘉牛利伟吴恒刘喜宗
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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