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a c/tib 2 Surface Treatment Methods of Composite Materials

A composite material and surface treatment technology, applied in the field of surface treatment of carbon fiber reinforced ceramic matrix composite materials, can solve the problems of composite material damage, fiber silicon corrosion, large volume expansion, etc.

Active Publication Date: 2020-06-12
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

When the residual Si volume fraction is high, some fibers will be eroded by silicon, and there will be large volume expansion and many cracks, which will cause the material to easily expand along the cracks when it is stressed, so the mechanical properties are poor.
However, there are few studies on the treatment of residual silicon at present. Although the research shows that silicon can be removed by etching with concentrated mixed acid, there is a disadvantage that it is easy to damage the composite material.

Method used

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  • a c/tib <sub>2</sub> Surface Treatment Methods of Composite Materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Prepare C / TiB as follows 2 Composite materials, the steps are as follows:

[0036] (1), liquid phenolic resin (solid content is 50 wt%) is dispersed in dehydrated alcohol, guarantees that the content of liquid phenolic resin in the dispersion is 2 wt%;

[0037] (II), the TiO 2 Powder and B 4 C powder is added to the solution obtained in step (I), and stirred evenly at 40°C; wherein TiO 2 Powder and B 4 The mass ratio of the total amount of C powder to absolute ethanol is 1:1, TiO 2 Powder and B 4 The mass ratio of C powder is 1.2:1;

[0038] (III), according to carbon fiber powder (length 45μm) and TiO 2 The mass ratio of the powder is 0.14:1. Add the carbon fiber powder into the solution obtained in step (II), and continue stirring at 60°C until the slurry becomes too thick to stir;

[0039] (IV), put the slurry in a drying oven, and dry at 90°C; after granulating through a 100-mesh sieve, put the powder in a mold, and press it at 180MPa to obtain a green body;...

Embodiment 2

[0047] C / TiB 2 The preparation of the composite material is the same as in Example 1.

[0048] C / TiB 2 The surface treatment steps of composite materials are as follows:

[0049] (1), use B 4 C powder embedding C / TiB obtained by siliconizing 2 For composite materials, react at 1000°C for 5 hours in vacuum, for strengthening the surface of composite materials;

[0050] (2), according to mass ratio Ti powder: NH 4 Cl:Al 2 o 3 =85:3:12, Ti powder, NH 4 Cl, Al 2 o 3 The powder is placed in a ball mill jar, and ball milled for 60 minutes to obtain a mixed powder;

[0051] (3) Embed the C / TiB treated in step (1) with the mixed powder obtained in step (2) 2 For the composite material, react in vacuum at 1300°C for 3 hours, and then cool down naturally.

Embodiment 3

[0053] C / TiB 2 The preparation of the composite material is the same as in Example 1.

[0054] C / TiB 2 The surface treatment steps of composite materials are as follows:

[0055] (1), use B 4 C powder embedding C / TiB obtained by siliconizing 2 Composite materials, reacted at 900°C for 5.5 hours in vacuum, used to strengthen the surface of composite materials;

[0056] (2), according to mass ratio Ti powder: NH 4 Cl:Al 2 o 3 =75:3:22, Ti powder, NH 4 Cl, Al 2 o 3 The powder is placed in a ball mill jar, and ball milled for 30 minutes to obtain a mixed powder;

[0057] (3) Embed the C / TiB treated in step (1) with the mixed powder obtained in step (2) 2 For the composite material, react in vacuum at 1250°C for 5 hours, and then cool down naturally.

[0058] C / TiB 2 See the following table for the residual silicon content and performance data of the composite material before and after the method of the present invention.

[0059]

[0060] As can be seen from the a...

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Abstract

The invention belongs to the field of surface treatment of carbon fiber reinforced ceramic-based composites and particularly discloses a surface treatment method of a C / TiB2 composite. The C / TiB2 composite is embedded in B4C powder and treated at the temperature of 950-1,100 DEG C under the vacuum condition; Ti powder, NH4Cl and Al2O3 powder are mixed uniformly, and mixed powder is obtained; the obtained mixed powder is used for embedding the treated C / TiB2 composite, and the C / TiB2 composite is subjected to a reaction at the temperature of 1,200-1,300 DEG C under the vacuum condition for 3-5 h and then naturally cooled. According to the method, a B4C layer is firstly deposited on the surface of the composite, Ti powder and residual silicon react to produce TiSi2, besides, the Ti powder can react with B4C on the surface to produce TiB2, and the performance of the composite is further stabilized.

Description

technical field [0001] The invention belongs to the field of surface treatment of carbon fiber reinforced ceramic matrix composite materials, in particular to a C / TiB 2 Surface treatment methods for composite materials. Background technique [0002] TiB 2 Because of its excellent performance, it is regarded as the most promising boride ceramic for wide application. It has good electrical conductivity, high melting point, hardness and corrosion resistance, making it suitable for making evaporating vessels, melting metal crucibles, cathodes of aluminum electrolytic cells, Spark plugs and other electrodes and contact switch materials are widely used; after compounding them with carbon materials, the ablation resistance performance is improved, and it has the characteristics of small material specific gravity, high thermal shock stability, good electrical conductivity and friction and wear resistance. , and the preparation cost is low, it is a kind of carbon / ceramic composite ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/563C04B41/85
CPCC04B35/563C04B41/009C04B41/5133C04B41/85C04B2201/50C04B2235/422C04B41/5031C04B41/5012C04B41/45C04B41/0072
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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