Process for preparing organic salt/ceramic base high temperature phase-changing energy-storing material

Abstract

The disclosed preparation technique for inorganic salt / ceramic-base high-temperature phase- change energy-storage material comprises: first, preparing the porous ceramic precast body with three-dimensional connected ultrastructure; heating the phase-change potential heat heat-storage inorganic slat material to full fusion in normal-pressure resistance furnace, dipping the precast body rapidly into the fused material; finally, cooling to room temperature, taking surface desalination treatment. Wherein, as the well wettability and capillary tension effect, the inorganic salt will unprompted infiltrate into the precast body. This invention simplifies process, and improves heat exchange efficiency greatly.

Description

technical field [0001] The invention relates to the field of energy material science, in particular to a preparation process of an inorganic salt / ceramic-based high-temperature phase-change energy storage material. Background technique [0002] Heat storage material is a new type of functional material that is widely used at present. Using it can solve the contradiction between energy supply and demand time and space. Heat storage material is mainly used in solar thermal utilization, industrial waste heat recovery, building energy conservation and other fields. There are two main known heat storage materials: sensible heat storage materials and phase change (latent heat) heat storage materials. Among them, sensible heat storage materials are easy to obtain, safe, and cheap, but the heat storage density is small and the use temperature cannot be constant; phase change (latent heat) heat storage materials mainly include inorganic salts, inorganic hydrated salts, metals and all...

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Problems solved by technology

The currently known preparation method of this kind of material mainly adopts the hybrid sintering method, but there are the following problems: First, the contradiction between the sintering temperature and the content of the inorganic salt of the phase change latent heat material in the composite material, because the heat storage performance of the phase change composite material mainly depends on The higher the content, the better the heat storage performance. However, the sintering temperature of the ceramic substrate is much higher than the melting point of the inorganic salt, and the evaporation of the molten salt is inevitable; secondly, it is precisely because the sintering temperature and The contradiction between the evaporation of molten salt and the sintering temperature cannot be too high, resulting in low mechanical strength of the composite energy storage material, especially when the size of the element becomes larger, the mechanical strength of the material will drop more seriously, which is not conducive to the industrial production of the material Third, because most of the inorganic salts have strong hygroscopicity, the finished material will be frosted on the surface due to the absorption of moisture in the air by the salt for a long time, which not only makes the material mildew , also affects the compactness and mechanical strength of the material as well as the appearance

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