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Preparation method of toughened high-temperature-resistant insulating heat-conducting composite material

A technology of insulation and heat conduction and composite materials, which is applied in the field of thermal management materials preparation, can solve the problems of high brittleness, insufficient toughness, poor thermal shock resistance, etc., achieve wide use temperature range, improve high-temperature sintering performance, mechanical properties and heat resistance Excellent shock performance

Active Publication Date: 2021-11-23
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of high brittleness, insufficient toughness, and poor thermal shock resistance of existing ceramic-based high-temperature-resistant insulating and heat-conducting materials represented by aluminum nitride materials, the invention provides a preparation method of a toughened high-temperature-resistant insulating and heat-conducting composite material

Method used

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  • Preparation method of toughened high-temperature-resistant insulating heat-conducting composite material

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preparation example Construction

[0028] The invention provides a preparation method of a strong and tough high temperature resistant insulation and heat conduction composite material, such as figure 1 As shown, it includes the following steps:

[0029] (1) The 2.5D continuous carbon fiber braid with an elastically compressible structure was dipped in a polycarbosilane solution, taken out, and dried to obtain a pretreated fabric A. In order to ensure the impregnation effect of the polycarbosilane solution on the fabric, the drying conditions are: drying at room temperature for 1-10h (can be any value within this range, such as 1h, 2h, 3h, 4h, 5h, 6h, 7h, 8h, 9h, After 10h), at 50-150°C (can be any value within this range, such as 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150° C.) for 1-10 hours (can be any value within this range, such as 1 h, 2 h, 3 h, 4 h, 5 h, 6 h, 7 h, 8 h, 9 h, 10 h).

[0030] (2) Add the aluminum nitrate into the ethanol solution of the phenolic resin, mix evenly...

Embodiment 1

[0038] (1) Take out the 2.5D continuous carbon fiber braid after dipping in the polycarbosilane solution, and obtain the pretreated fabric A after drying; in order to ensure the impregnation effect of the polycarbosilane solution on the fabric, the drying method described in step (1) can be further Preferably: after drying at room temperature for 1 hour, vacuum drying at 50°C for 10 hours;

[0039] (2) Aluminum nitrate is added in the ethanol solution of phenolic resin, after mixing uniformly, impregnating solution is obtained, for subsequent use;

[0040] (3) The pretreated fabric A obtained in step (1) is taken out after soaking in the dipping solution obtained in step (2), and the pretreated fabric B is obtained after drying; in order to ensure the impregnation effect of the pretreated fabric A, step (3) ) The drying method can be further preferably: after drying at 30°C for 5 hours, the temperature is raised to 90°C and the drying is continued for 10 hours;

[0041] (4) Alu...

Embodiment 2

[0047] (1) Take out the 2.5D continuous carbon fiber braid after dipping in the polycarbosilane solution, and obtain the pretreated fabric A after drying; in order to ensure the impregnation effect of the polycarbosilane solution on the fabric, the drying method described in step (1) can be further Preferably: after drying at room temperature for 10 hours, vacuum drying at 150°C for 1 hour;

[0048] (2) Aluminum nitrate is added in the ethanol solution of phenolic resin, after mixing uniformly, impregnating solution is obtained, for subsequent use;

[0049] (3) The pretreated fabric A obtained in step (1) is taken out after soaking in the dipping solution obtained in step (2), and the pretreated fabric B is obtained after drying; in order to ensure the impregnation effect of the pretreated fabric A, step (3) ) The drying method can be further preferably: after drying at 50°C for 2 hours, then heat up to 150°C and continue drying for 5 hours;

[0050] (4) Aluminum nitride powd...

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Abstract

The invention discloses a preparation method of a toughened high-temperature-resistant insulating heat-conducting composite material, and relates to the field of heat management materials. The preparation method comprises the following steps of: preparing a pretreated fabric A from a 2.5D continuous carbon fiber braided fabric with an elastic compression structure and a polycarbosilane solution; adding aluminum nitrate into an ethanol solution of phenolic resin to obtain a dipping solution; preparing a pretreated fabric B from the pretreated fabric A and the dipping solution; carrying out ball milling on aluminum nitride powder, ethanol and a silane coupling agent to obtain modified aluminum nitride; sequentially adding the modified aluminum nitride, nano aluminum oxide and aluminum nitrate into phenolic sol to obtain a sol mixture; adding the pretreated fabric B into the sol mixture, adding an amine catalyst, and carrying out a phenolic gel reaction to obtain a block C; and carrying out hot pressed sintering on the block C along a 2.5D continuous carbon fiber braided fabric to obtain the toughened high-temperature-resistant insulating heat-conducting composite material. The problems of high brittleness, insufficient toughness and poor thermal shock resistance of the existing ceramic-based high-temperature-resistant insulating heat-conducting material can be solved.

Description

technical field [0001] The invention relates to the technical field of preparation of thermal management materials, in particular to a preparation method of a strengthened and toughened high-temperature-resistant insulating and heat-conducting composite material. Background technique [0002] With the continuous development of electronic technology and the continuous application of high-power electronic devices, heat dissipation has become the main problem faced by the development of electronic integration technology. The material has a wide application prospect in the aerospace field because of its good high temperature resistance, thermal conductivity, and insulation properties. However, due to the problems of high brittleness, insufficient toughness, and poor thermal shock resistance of these three types of materials, the practical application prospects of these materials are seriously restricted. In order to solve this problem, it is urgent to invent a method for prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/581C04B35/624C04B35/645
CPCC04B35/80C04B35/581C04B35/624C04B35/645C04B2235/5248C04B2235/616C04B2235/9607C04B2235/96
Inventor 刘晓波何沐纪旭阳安烜熜孔德隆张凡李文静张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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