Laminar composite SiC/graphite film material for thermal management and preparation method thereof

Abstract

The invention discloses a laminar composite SiC / graphite film material for thermal management and a preparation method thereof. The composite material is prepared from, by volume, 10-50% of a reinforced SiC phase and 50-90% of a graphite film matrix phase, wherein graphite films and SiC are alternately distributed in the composite material layer by layer and show perfect directional arrangement. The preparation method of the composite material comprises the four steps of coating the surface of each graphite film with a SiC ceramic layer, stacking the graphite films coated with the SiC ceramiclayers on the surfaces layer by layer for pre-pressing and shaping, performing vacuum hot-pressing sintering on a pre-shaped sample, and performing subsequent treatment on the sintered sample. The preparation method effectively solves the problems that it is difficult to conduct sintering densification on a traditional composite SiC / graphite material and the interface bonding strength between SiCand graphite is low. The laminar composite SiC / graphite film material prepared by the method not only has high thermal conductivity in a direction parallel to a lamination direction but also can obtain a thermal expansion coefficient matched with a packaging substrate in a direction perpendicular to the lamination direction. Meanwhile, the material is low in density and high in strength and servesas a novel thermal management material with a great application prospect.

Description

technical field [0001] The invention relates to a functional material and a preparation method thereof, in particular to a SiC / graphite film layered composite material for thermal management and a preparation method thereof. Background technique [0002] In recent years, with the advancement of electronic components / devices towards high integration, miniaturization and light weight, the research on anisotropic graphite materials for thermal management has made great progress. At present, more researches are mainly on highly oriented graphite materials, and the raw materials used are usually graphite fibers, graphite flakes, etc. Such as the literature "Laminate squeeze casting of carbon fiber reinforced aluminum matrix composites" (Materials and Design.67 (2015) 154-158), the literature "In-plane thermal enhancement behaviors of Al matrix composites with oriented graphite flake alignment" (Composites: Part B 70 (2015) 256-262) et al. Studies have shown that the degree of o...

AI Technical Summary

Problems solved by technology

However, up to now, research on graphite film layered composites at home and abroad has mainly focused on high thermal conductivity metals (such as Al, Cu, etc.) composites for effective thermal management” (J.Alloys Compd.711(2017) 22-30), literature “Layer by layergraphite film reinforced aluminum composites with an enhanced performance of thermal conduction in the thermal management applications” (J.Alloys Compd.742(2018 ) 601-609), etc., there is no public literature report on SiC ceramic reinforced graphite film layered composites