A thermal functional composite material and its preparation method and application

Abstract

The present invention provides a heat functional composite material, as well as a preparation method and application thereof. The composite material comprises materials in parts by weight: 100 parts of a phase-change material and 0.01-60 parts of heat conduction filler capable of orientation. For the composite material, at a temperature higher than the phase-transition temperature, applying outer force to achieve orientation of the heat conduction filler in a manner of being vertical to a heat flow direction, and testing to obtain a heat conductivity vertical to the orientation direction; and then changing the direction of the outer force to achieve orientation of the heat conduction filler in a manner of being parallel to the heat flow direction, cooling to be lower than the phase-transition temperature, and testing to obtain a heat conductivity in the orientation direction. The tested heat conductivity can be subjected to reversible mutation up to 5 fold, and the heat functional composite material can be applied to the fields of heat energy storage, heat energy control (such as intelligent switches), building energy saving, heat dissipation of microelectronic devices, sensing, phonon devices, phonon computers and the like.

Description

technical field [0001] The invention relates to the field of thermal functional composite materials, in particular to a solid-liquid phase change composite material with magnetically regulated thermal conductivity reversible mutation. Background technique [0002] Thermal energy is an abundant energy source. 90% of the world's energy production is related to thermal energy flow, but unfortunately only 13% of it can be effectively utilized, and most of the thermal energy is consumed in the form of waste heat diffused to the environment. How to improve the utilization efficiency of thermal energy is the focus that scientists have been paying attention to. Thermal switches are generally made of materials with sudden change in thermal conductivity, that is, the thermal conductivity of the material will change suddenly at a certain temperature, and this change is reversible. At present, the thermal conductivity of pure phase change materials will undergo a sudden change of about...

AI Technical Summary

Problems solved by technology

It has been reported in the literature that after compounding phase change materials and non-oriented thermally conductive fillers, the mutation multiple of thermal conductivity has been slightly increased, and about 4 times the mutation will occur, but it still cannot meet the requirements of temperature control, thermal switching, building energy saving, thermal conductivity, etc. Requirements for materials with reversible mutations in thermal conductivity in fields such as stealth, radiation detection, quantum information, thermal storage, and sensing

Images