A medium-high temperature nanocomposite metal phase change heat storage material and its preparation method

Abstract

A method for preparing a medium-high temperature nano-composite metal phase-change heat storage material, comprising the following steps: respectively putting nano-copper powder with a particle size of 50 nm and ordinary tin powder with a particle size of 74 μm in an ultrasonic disperser for 50-70 minutes; Put into a ball mill and mix evenly to obtain copper-tin mixed particles; the mass ratio between nano-copper powder and ordinary tin powder is 1: (1-9); the copper-tin mixed particles are pressed into shape with a pressure of 100-500MPa by cold pressing method, The primary product of the copper-tin composite phase change thermal storage material is obtained; the primary product of the copper-tin composite phase change thermal storage material is put into a tube furnace for sintering at a sintering temperature of 250-300°C, kept for 30-40 minutes, and then naturally cooled to room temperature. Finally, a medium-high temperature copper-tin composite phase change heat storage material is obtained. The method can simplify the production process, reduce the production cost and reduce the pollution to the environment, and the prepared material can have high heat storage density, high thermal conductivity, excellent leakage resistance and excellent mechanical properties.

Description

technical field [0001] The invention relates to the technical field of phase change materials, in particular to a medium-high temperature nanocomposite metal phase change heat storage material and a preparation method thereof. Background technique [0002] Phase change heat storage material refers to a substance that is accompanied by a large amount of heat absorption or heat release when a solid-liquid phase change occurs at a specific temperature (ie, phase change temperature). Nearly isothermal and other characteristics, it is widely used in the field of heat flux adjustment and temperature control, so as to realize peak shifting and valley filling of heat flux and improve energy utilization efficiency. [0003] According to the classification of phase change materials, it can be divided into organic phase change materials, inorganic phase change materials and composite phase change materials. In practical applications, phase change materials are usually classified accor...

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Problems solved by technology

At present, the use of metals or alloys to prepare phase change materials mainly has problems such as low sensible heat density, difficulty in preventing leakage, complicated preparation process, high production cost, and serious environmental pollution; The material is prone to high-temperature reactions, so it is necessary to find a container with good compatibility with the metal

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