Composite thermally-conductive thin layer and preparation method and application thereof

Abstract

The invention relates to design and a preparation technique of continuous laminated carbon fiber reinforced resin matrix composite high in thermal conductivity and toughness, and intermediate composite thermally-conductive thin layers and finished composite products of the continuous laminated carbon fiber reinforced resin matrix composite. The preparation technique is mainly characterized in that meshed low-surface-density nonwoven, a porous membrane or fabric are used as functional carriers to carry one or mixture of some of high-thermal-conductivity, nano-micron and small-scale carbon nanotubes, graphene, boron nitride micropowder, expanded graphene micropowder, diamond micropowder and the like so as to prepare the composite thermally-conductive thin layer with high thermal conductivity and toughening potential, the composite thermally-conductive thin layer is placed between layers of conventional carbon fiber laminated composite by intercalation technology, and forming and curing are performed to prepare the structural composite high in overall thermal conductivity and toughness. The preparation technique is simple to operate. The toughness of the obtained composite is improved greatly, inter-layer and intra-layer thermal conductivities are both improved, and the obtained composite is high in overall thermal conductivity and toughness.

Description

technical field [0001] The present invention relates to a composite heat-conducting thin layer and its preparation method and application. The technology includes the preparation technology of a heat-conducting thin layer with high thermal conductivity and toughening effect and the overall high thermal-conducting and high-toughness structure prepared by using the heat-conducting thin layer. A composite material belongs to the technical field of preparation of functional composite materials. Background technique [0002] Continuous carbon fiber reinforced resin-based laminated composites have high specific strength and specific stiffness, and are increasingly used as structural materials in aerospace and civil fields. However, due to the structural characteristics of this composite material, although carbon fiber itself is in The fiber direction has a high thermal conductivity, but the resin-rich region between the layers has a very low thermal conductivity similar to most or...

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Problems solved by technology

However, there are few reports on the improvement of thermal conductivity of continuous carbon fiber composite materials. Related reports include: 46th InternationalSAMPE Symposium and Exhibition.2001: Materials and Processes Odyssey (2): 1530-1537, adding boron nitride directly between layers fine powder, but it will inevitably lead to the decline of impact delamination performance; Carbon, 50 (3): 1135-1145, 2011 added graphite nanosheet paper between the layers, but the author did not point out the graphite nanosheet paper inserted between the paper layers Contributes to the interlayer toughness of composite materials; Carbon, 49 (8): 2817-2833, 2010 incorporates carbon nanotubes, but the dispersion of individual carbon nanotubes is a difficult point, and it is difficult for laminated resin-based composites In particular, there are different opinions on the toughening effect of aviation-grade resin-based composites

Although this technique of introducing a tough structure between layers improves the toughness of the composite material, it also increases the gap between the carbon fiber resin-rich layers to a certain extent, and this tough structure usually has a thermal conductivity similar to that of the interlayer resin. rate, thus making the layer with high thermal resistance become less thermally conductive

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