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A whisker-toughened phase-change thermal storage microcapsule and its preparation method

A technology of microcapsules and toughened phases is applied in the field of whisker toughening phase change heat storage microcapsules and their preparation, which can solve the problems of poor thermal shock resistance of alumina, insufficient thermal cycle life of microcapsules, and limited industrial applications. , to achieve the effects of low cost, improved heat utilization and utilization efficiency, and long service life

Active Publication Date: 2021-11-16
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above methods, a layer of alumina shell is coated on the surface of aluminum or aluminum-silicon alloy. Due to the poor thermal shock resistance of alumina, the thermal cycle life of the microcapsules is insufficient, which limits industrial applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A whisker-toughened phase-change thermal storage microcapsule and a preparation method thereof. The preparation method described in this embodiment is:

[0052] Step 1. Alternately wash the aluminum-silicon alloy powder with acid solution and deionized water for 3 times, then place the washed aluminum-silicon alloy powder in a protective atmosphere, and dry it at 80°C for 3 hours to obtain the surface-modified aluminum alloy powder. Silicon alloy powder.

[0053] Step 2, placing the surface-modified aluminum-silicon alloy powder in pressurized steam for 10 minutes to obtain pretreated aluminum-silicon alloy powder.

[0054] Step 3. According to the mass ratio of ethyl orthosilicate: absolute ethanol: water of 1:0.8:1, the ethyl orthosilicate, absolute ethanol and water are uniformly mixed to prepare a silica sol precursor.

[0055] Step 4: According to the mass ratio of the pretreated aluminum-silicon alloy powder: aluminum fluoride being 100:0.05, the pretreated alum...

Embodiment 2

[0064] A whisker-toughened phase-change thermal storage microcapsule and a preparation method thereof. The preparation method described in this embodiment is:

[0065] Step 1. Alternately wash the aluminum-silicon alloy powder with acid solution and deionized water for 5 times, then place the washed aluminum-silicon alloy powder in a protective atmosphere, and dry it at 90°C for 5 hours to obtain the surface-modified aluminum alloy powder. Silicon alloy powder.

[0066] Step 2, placing the surface-modified aluminum-silicon alloy powder in pressurized water vapor for 30 minutes to obtain pretreated aluminum-silicon alloy powder.

[0067] Step 3: According to the mass ratio of ethyl orthosilicate: absolute ethanol: water of 1:1:1.5, the said ethyl orthosilicate, absolute ethanol and water are uniformly mixed to prepare a silica sol precursor.

[0068] Step 4: According to the mass ratio of the pretreated aluminum-silicon alloy powder: aluminum fluoride being 100:0.08, the pret...

Embodiment 3

[0077] A whisker-toughened phase-change thermal storage microcapsule and a preparation method thereof. The preparation method described in this embodiment is:

[0078] Step 1. Alternately wash the aluminum-silicon alloy powder with acid solution and deionized water for 6 times, then place the washed aluminum-silicon alloy powder in a protective atmosphere, and dry at 100°C for 10 hours to obtain surface-modified aluminum Silicon alloy powder.

[0079] Step 2, placing the surface-modified aluminum-silicon alloy powder in pressurized water vapor for 50 minutes to obtain pretreated aluminum-silicon alloy powder.

[0080] Step 3: According to the mass ratio of ethyl orthosilicate: absolute ethanol: water of 1:1.5:2, the said ethyl orthosilicate, absolute ethanol and water are uniformly mixed to prepare a silica sol precursor.

[0081] Step 4: According to the mass ratio of the pretreated aluminum-silicon alloy powder: aluminum fluoride being 100:0.1, the pretreated aluminum-sili...

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Abstract

The invention relates to a whisker-toughened phase-change thermal storage microcapsule and a preparation method thereof. The technical scheme is: firstly wash the aluminum or aluminum-silicon alloy powder alternately with acid solution or alkali solution and deionized water, and dry; place in pressurized water vapor, then place in silica sol precursor, stir, and vacuum Stand still, adjust the pH value, and filter; dry the filtered filter residue, then place it in a muffle furnace, burn it in an air atmosphere at 1050-1250 ° C, and cool it naturally with the furnace to obtain a whisker toughened phase transformation Thermal storage microcapsules. The invention has the characteristics of low raw material cost, simple preparation process and easy realization of industrial production; the prepared whisker toughened phase change heat storage microcapsules can improve the utilization rate and utilization efficiency of heat, have high service temperature and long service life, and are suitable for Used in solar power plants, high-temperature heat exchange of industrial furnaces and heat recovery of high-temperature industrial waste gas.

Description

technical field [0001] The invention belongs to the technical field of phase change thermal storage microcapsules. In particular, it relates to a whisker-toughened phase-change thermal storage microcapsule and a preparation method thereof. Background technique [0002] Heat storage technology is a heat storage and release technology that uses heat storage materials to store temporarily unnecessary heat, and then releases heat when heat is needed. The core of heat storage technology is the preparation and application of heat storage materials. Currently, commonly used phase change heat storage materials mainly include organic phase change materials, inorganic phase change materials, metals and alloys. Metals and related alloys have the characteristics of large thermal conductivity, high latent heat of phase transition, stable phase transition temperature, and small volume change during the phase transition process, making them ideal phase change heat storage materials. Howe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06B01J13/02
CPCB01J13/02C09K5/063Y02P20/10
Inventor 张美杰张吉祥顾华志黄奥付绿平杨爽栗海峰
Owner WUHAN UNIV OF SCI & TECH
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