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Preparation method of high temperature adhesive used for carbon-based composite material

A technology of high-temperature adhesives and composite materials, which is applied in the field of preparation of high-temperature adhesives for carbon-based composite materials, which can solve the problems of unsatisfactory thermal shock resistance and achieve low preparation costs and high bonding strength

Active Publication Date: 2010-03-17
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic material adhesive can generate carbon and silicon oxide respectively after high temperature treatment, and the adhesive has good bonding performance, but it is a single-phase structure material, and its thermal shock resistance is not ideal
Inorganic material adhesives bond carbon-based composites by forming carbides at high temperatures, but the thermal expansion coefficient (CTE) of the adhesive is much larger than the CTE of carbon-based composites, making it easy to generate many cracks during thermal cycling

Method used

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  • Preparation method of high temperature adhesive used for carbon-based composite material
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Embodiment 1

[0028] The present invention is a method for preparing a high-temperature (300-1700° C.) adhesive for carbon-based composite materials. The specific steps of the method are as follows:

[0029] Step 1: Preparation method of high temperature adhesive

[0030] In the present invention, the adhesive consists of 35wt.% organic silicon resin tetraethyl orthosilicate, 30wt.% 350 mesh low melting point filler ceramic powder, 15wt.% 200 mesh boron powder, 19.8wt.% 200 mesh silicon powder And 0.2wt.% carbon fiber composition, its preparation steps are as figure 2 shown. Among them, tetraethyl orthosilicate and ceramic powder are industrial standards, and others are analytically pure standards. Mix ceramic powder, boron powder and silicon powder according to the above percentages, dry at 140°C for 2 hours, then grind for 1 hour and sieve to obtain a uniform solid mixture, then mix it with carbon fiber to prepare a powder mixture; Ethyl ester and acetone are mixed according to the vo...

Embodiment 2

[0039] The present invention is a method for preparing a high-temperature (300-1700° C.) adhesive for carbon-based composite materials. The specific steps of the method are as follows:

[0040] Step 1: Preparation method of high temperature adhesive

[0041] In the present invention, the adhesive consists of 35wt.% organic silicon resin tetraethyl orthosilicate, 25wt.% 350 mesh low melting point filler ceramic powder, 15wt.% boron powder 200 mesh, 24.6wt.% silicon powder 200 mesh And 0.4wt.% carbon fiber composition, its preparation steps are as figure 2 shown. Among them, tetraethyl orthosilicate and ceramic powder are industrial standards, and others are analytically pure standards. Mix ceramic powder, boron powder and silicon powder according to the above percentages, dry at 140°C for 2 hours, then grind for 1 hour and sieve to obtain a uniform solid mixture, then mix it with carbon fiber to prepare a powder mixture; Ethyl ester and acetone are mixed according to the vo...

Embodiment 3

[0050] The present invention is a method for preparing a high-temperature (300-1700° C.) adhesive for carbon-based composite materials. The specific steps of the method are as follows:

[0051] Step 1: Preparation method of high temperature adhesive

[0052] In the present invention, the adhesive consists of 40wt.% organic silicon resin tetraethyl orthosilicate, 30wt.% 350 mesh low-melting filler ceramic powder, 15wt.% 200 mesh boron powder, 14.6wt.% 200 mesh silicon powder And 0.4wt.% carbon fiber composition, its preparation steps are as figure 2 shown. Among them, tetraethyl orthosilicate and ceramic powder are industrial standards, and others are analytically pure standards. Mix ceramic powder, boron powder and silicon powder according to the above percentages, dry at 140°C for 2 hours, then grind for 1 hour and sieve to obtain a uniform solid mixture, then mix it with carbon fiber to prepare a powder mixture; Ethyl ester and acetone are mixed according to the volume r...

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Abstract

A preparation method of a high temperature adhesive used for a carbon-based composite material includes the following steps: step 1. preparation process of high temperature adhesive: mixing 35-40wt.% of organic silicon resin, 25-30wt.% of low melting point filler, 15-20wt.% of boron powder, 15-25wt.% of silicon powder and 0.1-0.5wt.% of carbon fiber to form the adhesive; and step 2. adhesive solidification and high-temperature heat treatment process: during adhering process, uniformly coating the adhesive on an adhesion surface of the carbon-based composite material with the surface carved with a regular fine groove, then putting the carbon-based composite material in a high vacuum carbon tube furnace to be solidified at the temperature of 300 DEG C for 3h in a vacuum environment with 0.1MPa of vacuum degree, during the solidification, applying 2.5Mpa pressure on the material, then heating the material at the heating rate of 50 DEG C / h, and finally, conducting heat treatment for 1h atthe high temperature of 1, 700 DEG C. The preparation cost is low, the bonding strength is high, and the adhesive has resistance to high temperature as well as thermal shock. Besides, after 50 times of thermal circulation at the temperature of 1, 500 DEG C, the material can still maintain certain strength. The high temperature adhesive has broad practical value and application prospect in the field of the carbon-based composite materials.

Description

(1) Technical field: [0001] The invention relates to a preparation method of a high-temperature adhesive for carbon-based composite materials. The high temperature is 300-1700° C., which belongs to the technical field of carbon-based composite materials. (two) background technology: [0002] Due to its low density, special mechanical and thermophysical properties, carbon-based composites have attracted more and more attention. In particular, carbon fiber-reinforced carbon-based composites have been widely used in aviation due to their unique high-temperature mechanical and thermophysical properties. Aerospace and other cutting-edge technology fields. Due to its special preparation process and the addition of carbon fiber, the cost of carbon-based composite materials is higher than that of ordinary materials. Therefore, the repair technology of carbon-based composite materials has attracted more and more attention from scholars from all over the world. The repair of carbon-b...

Claims

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Application Information

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IPC IPC(8): C04B37/00
Inventor 罗瑞盈向巧毕燕洪安娜
Owner BEIHANG UNIV
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