KR-20260065640-A - High thermal conductivity sandwich composite and manufacturing method thereof

KR20260065640AKR 20260065640 AKR20260065640 AKR 20260065640AKR-20260065640-A

Abstract

The present invention relates to a thermally conductive sandwich composite comprising a graphite laminate, a honeycomb structure, and pitch-based carbon fibers or copper wires, and a method for manufacturing the same. By enabling thermal conduction in the thickness direction and in-plane direction of the thermally conductive sandwich composite, the thermal conductivity can be increased while simultaneously exhibiting load-bearing performance.

Inventors

곽병수
윤성원
주민수

Assignees

경상국립대학교산학협력단

Dates

Publication Date: 20260511
Application Date: 20241030

Claims (9)

First prepreg laminate; 2nd prepreg laminate; A honeycomb structure comprising a plurality of unit cells aligned in a vertical direction, located between the first prepreg laminate and the second prepreg laminate; and A thermally conductive sandwich composite comprising a stitching portion stitched through the first prepreg laminate, the second prepreg laminate, and the honeycomb structure.
In paragraph 1, A thermally conductive sandwich composite further comprising an adhesive film positioned between the first prepreg laminate, the second prepreg laminate, and the honeycomb structure, respectively.
In paragraph 1, The above first prepreg laminate and second prepreg laminate are a thermally conductive sandwich composite in which one or more prepregs comprising polyacrylonitrile-based carbon fibers and thermosetting resins are laminated.
In paragraph 1, A thermally conductive sandwich composite, wherein the material of the above honeycomb structure is selected from aluminum, aramid fiber paper, glass fiber reinforced composite material and carbon fiber reinforced composite material.
In paragraph 1, The above-mentioned stitching portion comprises a pitch-based carbon fiber or copper wire, and is a thermally conductive sandwich composite.
In paragraph 1, A thermally conductive sandwich composite, wherein the stitching portion is stitched in a spaced-apart manner, and the end of the stitching portion protrudes to the outside of the composite and is bent in the direction of the outer surface of the first prepreg laminate and the outer surface of the second prepreg laminate.
In paragraph 1, A thermally conductive sandwich composite having a stitching spacing of the above-mentioned stitching portion that is 1 to 3 times the unit cell diameter of the above-mentioned honeycomb structure.
A step of manufacturing a first prepreg laminate and a second prepreg laminate, respectively, by stacking multiple prepregs; A step of forming a sandwich laminate by positioning a honeycomb structure comprising a plurality of unit cells between the first prepreg laminate and the second prepreg laminate such that the plurality of unit cells are aligned in a vertical direction; A step of stitching the sandwich laminate to form a stitched portion penetrating the first prepreg laminate, the second prepreg laminate and the honeycomb structure; and A method for manufacturing a thermally conductive sandwich composite according to claim 1, comprising the step of heating and curing a sandwich laminate in which the stitching portion is formed.
In paragraph 8, A method for manufacturing a thermally conductive sandwich composite, wherein the curing is performed at a temperature of 50°C to 150°C for a time of 100 minutes to 150 minutes.

Description

High thermal conductivity sandwich composite and manufacturing method thereof The present invention relates to a thermally conductive sandwich composite comprising a prepreg laminate and a honeycomb structure, and a method for manufacturing the same. Carbon fiber reinforced plastic (CFRP) is used in various fields ranging from transportation, construction, marine, electrical, electronic, aviation, and space industries due to its excellent specific stiffness and specific strength, as well as its excellent corrosion resistance, fatigue characteristics, and lightweight properties. The most commonly used polyacrylonitrile (PAN)-based carbon fiber reinforced plastics are manufactured using polyacrylonitrile and exhibit excellent strength and modulus, but have the problem of low thermal conductivity. In addition, pitch-based carbon fiber reinforced plastics are manufactured using petroleum pitch and are inexpensive while exhibiting excellent strength. However, because temperatures change rapidly in the space environment, it is necessary to quickly dissipate heat to protect the structural stability of spacecraft, satellites, and internal electronic equipment. While sandwich composite structures are widely known for their excellent bending stiffness and strength, they have a limitation in that their heat transfer performance in the thickness direction is low. Additionally, there is a limitation in that structural performance is significantly degraded when a technique is applied to enhance the thermal conductivity of a sandwich composite structure by using binders after machining holes in the basic sandwich composite structure. Therefore, there is a need for a sandwich composite structure with excellent thermal conductivity while maintaining a similar level of mechanical performance to existing sandwich composite structures. FIG. 1 is a schematic perspective view of a thermally conductive sandwich composite according to one embodiment of the present invention. FIG. 2 is a schematic side cross-sectional view of a thermally conductive sandwich composite according to one embodiment of the present invention of FIG. 1. FIG. 3 is a side cross-sectional view schematically showing the heat transfer path of a thermally conductive sandwich composite according to one embodiment of the present invention of FIG. 1. FIG. 4 is a perspective view schematically illustrating the manufacturing process of a thermally conductive sandwich composite according to one embodiment of the present invention. Figure 5 shows the results of measuring the thermal conductivity in the thickness direction of the thermally conductive sandwich composites prepared in Examples 1-1 to 1-3 and Comparative Example. When a part of the entire specification is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Throughout the present specification, terms including ordinal numbers, such as “first” and “second,” are used for the purpose of distinguishing one component from another and are not limited by said ordinal numbers. For example, within the scope of the invention, the first component may also be named the second component, and similarly, the second component may be named the first component. Throughout this specification, "thickness direction" and "stacking direction" indicate the direction in which prepregs are stacked to form layers, and specifically, may mean a direction from one surface where one prepreg and another prepreg come into contact to the other surface of said prepreg. Throughout this specification, "in-plane direction" means a direction orthogonal to the thickness direction (stacking direction). Throughout this specification, when a component is described as being located "on" another component, this includes not only cases where a component is in contact with another component, but also cases where another component exists between the two components. The configuration of a specific embodiment of the present invention will be described in detail below with reference to the attached drawings. Here, it should be noted that when assigning reference numerals to the components of each drawing, identical components are denoted by the same numeral whenever possible, even if they are shown in different drawings. A thermally conductive sandwich composite according to one embodiment of the present invention comprises: a first prepreg laminate; a second prepreg laminate; a honeycomb structure comprising a plurality of unit cells aligned in a vertical direction located between the first prepreg laminate and the second prepreg laminate; and a stitching portion stitched through the first prepreg laminate, the second prepreg laminate and the honeycomb structure. According to one embodiment of the present invention, the thermally conductive sandwich composite may further include an adhesive film positioned between the first prepreg