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High-temperature-resistant composite material and high-temperature thermal expansion forming method thereof

A composite material and molding method technology, applied in the field of high temperature resistant composite materials and high temperature thermal expansion molding, can solve problems such as inability to effectively provide thermal expansion pressure, incompetent thermal expansion process, surface microcracks, etc., and achieve reliable process methods and manufacturing costs. Low, good performance effect

Active Publication Date: 2019-03-01
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the curing temperature of composite materials continues to increase, traditional silicone rubber mandrels will age rapidly in high-temperature environments, and micro-cracks will appear on the surface and become hard and brittle, which cannot effectively provide thermal expansion pressure.
Therefore, for composite materials cured at high temperature, the traditional thermal expansion process is not competent

Method used

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  • High-temperature-resistant composite material and high-temperature thermal expansion forming method thereof
  • High-temperature-resistant composite material and high-temperature thermal expansion forming method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A high-temperature resistant polyimide composite material box-shaped component is made. The length of the composite material box-shaped component is 300mm, the width is 100mm, the height is 25mm, and the wall thickness is 3mm.

[0054] The box-shaped component is made of polyimide carbon fiber prepreg in the order of {45 / 0 / -45 / 90} to form a 0.5mm-thick prepreg, and the blanking sample is produced according to the box-shaped structure and cut by an automatic cloth cutting machine. The embedded skeleton structure is formed, the embedded skeleton structure is superimposed, and then covered with carbon fiber fabric prepreg as a whole, and finally the fluororubber core mold is used for high temperature thermal expansion molding. The curing process is 240°C for 2 hours, 300°C for 1 hour, then 370°C for 2 hours, and demoulding to form an integrated box-shaped component. The specific implementation process is as follows:

[0055] Mix well-mixed 3F brand FE-2602 fluororubber an...

Embodiment 2

[0061] A high-temperature-resistant cyanate resin composite material flat member was prepared, the length of the composite flat member was 300mm, the width was 100mm, and the thickness was 20mm.

[0062] The cyanate resin carbon fiber prepreg is cut into qualified size, and the layers are stacked to form a flat prepreg, which is formed by high temperature thermal expansion of the fluororubber mandrel. The curing process is 220°C for 2 hours, 280°C for 1 hour, then 350°C for 2 hours, and demoulding to form an integrated component. The specific implementation process is as follows:

[0063] Mix well-mixed 3F brand FE-2602 fluororubber and bis(2,4-dichlorobenzoyl) peroxide (i.e. vulcanizing agent), and use vacuum defoaming for defoaming treatment to prepare glue solution; The mass ratio of the fluororubber to the vulcanizing agent is 100:7; the master mold of the soft mold is processed according to the structural design requirements of the component; the glue is poured into the ...

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Abstract

The invention relates to a high-temperature-resistant composite material and a high-temperature thermal expansion forming method thereof. The forming method includes the steps: (1) preparing a fluoride rubber core mold: uniformly mixing fluoride rubber and vulcanizing agents and defoaming the fluoride rubber and the vulcanizing agents to prepare glue solution; processing a female mold of a flexible mold according to component structure design requirements; pouring the glue solution into the female mold and performing vulcanization to obtain the fluoride rubber core mold; (2) processing prepreginto a preform, placing the preform between the fluoride rubber core mold and the female mold, determining process gaps, and closing and fastening the molds; (3) vacuumizing a mold cavity of the moldand the preform in the mold, heating and insulating the mold and finally performing curing to obtain the high-temperature-resistant composite material. The weight ratio of the fluoride rubber to thevulcanizing agents is 100:(7-10). The method solves the problems that expansion pressure is reduced by aging of traditional silicon rubber under the condition of high temperature, a workpiece is loosedue to insufficient curing pressure, and the like.

Description

technical field [0001] The invention relates to the technical field of composite material molding, in particular to a high-temperature-resistant composite material and a high-temperature thermal expansion molding method thereof. Background technique [0002] The thermal expansion process refers to the molding method in which the composite material prepreg is processed and solidified by the thermal expansion of the silicone rubber mandrel in the closed rigid female mold. Effective and reasonable control of the thermal expansion pressure of silicone rubber is the key technology in the thermal expansion molding process, so the current research focus is mainly on how to control the thermal expansion pressure of silicone rubber during the molding process. The core mold of the traditional thermal expansion process is mainly made of silicone rubber, and the core mold can generate expansion pressure in all directions without the need for an external pressure source, and is especiall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/46B29C70/54B29C70/68B29C35/02C08L27/12C08K5/14
CPCC08K5/14B29C35/0288B29C70/46B29C70/54B29C70/68C08L27/12
Inventor 郝自清柯红军
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH