A large-diameter phase-change thermal storage particle and its preparation method

A phase-change heat storage and large-diameter technology, which is applied in chemical instruments and methods, heat exchange materials, sustainable manufacturing/processing, etc., can solve the problems of difficult to meet the dispersion requirements of industrial applications, small particle size, etc., and achieve the use The effect of long life, high temperature and high strength

Active Publication Date: 2021-01-01
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of this kind of microcapsules is simple, but the particle size of the raw materials is small and there is adhesion between the prepared microcapsules, so it is difficult to meet the industrial application with high requirements for dispersibility

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A large-diameter phase-change thermal storage particle and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0033] Step 1. Alternately washing the aluminum-silicon alloy powder with acid and deionized water for 1-5 times, then placing it in a protective atmosphere, and drying at 60-120° C. for 3-7 hours to obtain surface-modified aluminum-silicon alloy powder.

[0034] Step 2. First place the surface-modified aluminum-silicon alloy powder in a high-temperature atmosphere furnace, then roast according to the following six-stage heating system and the corresponding furnace atmosphere, and then naturally cool to room temperature to obtain a large-diameter phase Become heat storage particles.

[0035] The heating system of the first stage is to raise the temperature from room temperature to the first temperature at a rate of 5-7°C / min; the atmosphere in the furnace is a water vapor atmosphere, and the inlet gauge pressur...

Embodiment 2

[0045] A large-diameter phase-change thermal storage particle and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0046] Step 1. Alternately washing the aluminum-silicon alloy powder with alkali and deionized water for 3-8 times, then placing it in a protective atmosphere, and drying at 100-160° C. for 6-10 hours to obtain surface-modified aluminum-silicon alloy powder.

[0047] Step 2. First place the surface-modified aluminum-silicon alloy powder in a high-temperature atmosphere furnace, then roast according to the following six-stage heating system and the corresponding furnace atmosphere, and then naturally cool to room temperature to obtain a large-diameter phase Become heat storage particles.

[0048] The heating system of the first stage is to heat up from room temperature to the first temperature at a rate of 6.5-8.5°C / min; the atmosphere in the furnace is a water vapor atmosphere, and the inlet gauge pressure of t...

Embodiment 3

[0058] A large-diameter phase-change thermal storage particle and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0059] Step 1. Alternately washing the aluminum-silicon alloy powder with alkali and deionized water for 6-10 times, then placing it in a protective atmosphere, and drying at 140-200° C. for 9-12 hours to obtain surface-modified aluminum-silicon alloy powder.

[0060] Step 2. First place the surface-modified aluminum-silicon alloy powder in a high-temperature atmosphere furnace, then roast according to the following six-stage heating system and the corresponding furnace atmosphere, and then naturally cool to room temperature to obtain a large-diameter phase Become heat storage particles.

[0061] The heating system of the first stage is to heat up from room temperature to the first temperature at a rate of 8-10°C / min; the atmosphere in the furnace is a water vapor atmosphere, and the inlet gauge pressure of the...

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Abstract

The invention relates to a large-diameter phase change heat storage particle and a preparation method thereof. According to the technical scheme, aluminum-silicon alloy powder is alternately washed byan acid and deionized water or alternately washed by an alkali and deionized water, and drying is carried out in a protective atmosphere at 60-200 DEG C to obtain surface-modified aluminum-silicon alloy powder; then the surface-modified aluminum-silicon alloy powder is placed in a high-temperature atmosphere furnace, the temperature is increased to 550-650 DEG C, 700-800 DEG C, 850-950 DEG C, 1050-1250 DEG C and 1350-1500 DEG C at the rates of 5-10 DEG C / min, 10-20 DEG C / min, 5-8 DEG C / min, 3-5 DEG C / min and 5-10 DEG C / min and corresponding furnace atmospheres respectively in sequence, natural cooling is carried out, and the large-diameter phase change heat storage particle is obtained. The diameter of the large-diameter phase change heat storage particle is 214-310 microns. The large-diameter phase change heat storage particle and the preparation method thereof have the advantages that the preparation process is simple, the cost is low, and the industrial production is easy; the manufactured product can improve the utilization rate and utilization efficiency of heat, and the use temperature is high.

Description

technical field [0001] The invention belongs to the technical field of phase change thermal storage particles. In particular, it relates to a large-diameter phase change heat storage particle and a preparation method thereof. Background technique [0002] The phase change heat storage particles are composed of phase change material as core and coating material as shell. Due to the advantages of non-corrosion, anti-medium leakage, high heat storage density and constant temperature during phase change, phase change heat storage particles have become a research hotspot in recent years. [0003] Phase change materials are classified by phase change temperature, and phase change materials with a phase change temperature above 500°C are called high temperature phase change materials. Aluminum and aluminum-silicon alloys are one of the high-temperature phase change heat storage materials, which have the advantages of good thermal conductivity, good thermal stability, large latent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCY02P20/10
Inventor 张美杰韩藏娟顾华志白晨罗志安付绿平
Owner WUHAN UNIV OF SCI & TECH
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