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High-performance composite phase-change material and preparation method thereof

A technology of composite phase change materials and phase change composite materials, which is applied in the field of composite materials, can solve problems such as the inability to meet the needs of high-power heat dissipation, the inability to maintain uniform distribution of nanowires, and damage to the thermophysical properties of composite phase change materials, so as to improve the phase Effects of variable heat transfer efficiency, shape stability, and leakage prevention

Active Publication Date: 2018-07-06
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal conductivity of the material is 85-95J / g for phase change latent heat, and the thermal conductivity is 2.85W m -1 ·K -1 , unable to meet high-power heat dissipation requirements
At the same time, due to the difference in density and wettability between metal nanowires and organic materials, after multiple melting-solidification phase transitions, the nanowires cannot maintain a uniform distribution in the organic material, which will destroy the thermophysical properties of the composite phase change material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of a high-performance composite phase-change material for a high-power laser radiator, the steps of which are as follows:

[0043] (1) Preparation of phase change thermal storage matrix material:

[0044] Vacuum melting 35Bi-30Sn-30In-5Zn (weight percentage, the same below), melting temperature 400 ℃, melting time 10min, vacuum degree 1×10 -2 Pa, apply voltage, power 1kw, fill the alloy with argon protection for 5 minutes after the alloy starts to melt, so that the alloy is fully and evenly melted, poured, and a liquid alloy block is obtained.

[0045] (2) Preparation of carbon nanotube sponge skeleton material:

[0046] Dissolve ferrocene in o-xylene solvent to make a catalytic precursor. The concentration of the catalytic precursor solution is controlled at 30mg / ml. Use a micro injection pump to inject the catalytic precursor solution into the chemical vapor deposition furnace. The injection rate of the catalytic precursor solution is controlled ...

Embodiment 2

[0053] A preparation method of a high-performance composite phase-change material for a high-power laser radiator, the steps of which are as follows:

[0054] (1) Preparation of phase change thermal storage matrix material:

[0055] Vacuum melting 50Bi-13.3Sn-10Cd-26.7In, melting temperature 350 ℃, melting time 15min, vacuum degree 1×10 -2 Pa, apply voltage, power 1kw, fill the alloy with argon protection for 10 minutes after the alloy starts to melt, so that the alloy is fully and uniformly melted, poured, and a liquid alloy block is obtained.

[0056] (2) Preparation of carbon nanotube sponge skeleton material:

[0057] Dissolve ferrocene in o-xylene solvent to make a catalytic precursor. The concentration of the catalytic precursor solution is controlled at 10mg / ml. Use a micro injection pump to inject the catalytic precursor solution into the chemical vapor deposition furnace. The injection rate of the catalytic precursor solution is controlled At 0.1ml / min, the chemical...

Embodiment 3

[0064] A preparation method of a high-performance composite phase-change material for a high-power laser radiator, the steps of which are as follows:

[0065] (1) Preparation of phase change thermal storage matrix material:

[0066] Vacuum melting 18.5Bi%-Sn21.3%-53.2%In-7%Ga, melting temperature 300°C, melting time 10min, vacuum degree 1×10 -2 Pa, apply voltage, power 0.5kw, after the alloy starts to melt, fill it with argon gas for protection for 10 minutes, so that the alloy is fully and uniformly melted, poured, and a liquid alloy block is obtained.

[0067] (2) Preparation of carbon nanotube sponge skeleton material:

[0068] Dissolve ferrocene in o-xylene solvent to make a catalytic precursor. The concentration of the catalytic precursor solution is controlled at 90mg / ml. Use a micro injection pump to inject the catalytic precursor solution into the chemical vapor deposition furnace. The injection rate of the catalytic precursor solution is controlled At 1ml / min, the c...

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Abstract

The invention discloses a high-performance composite phase-change material, belonging to the technical field of composite materials. The high-performance composite phase-change material comprises liquid alloy with high latent heat of phase change and a modified carbon nanotube sponge skeleton, wherein the modified carbon nanotube sponge skeleton is filled with the liquid alloy with high latent heat of phase change. The high-performance composite phase-change material comprises the liquid alloy with high latent heat of phase change and a melting point adjustable in a range of 20 to 130 DEG C and the modified carbon nanotube sponge skeleton with high thermal conductivity, wherein the liquid alloy uses InSnBi alloy as a substrate and one or more selected from a group consisting of high-enthalpy elements Ga, Cd, Zn and Sb as additives. The high-performance composite phase-change material has high latent heat of volume phase change, high thermal conductivity, low expansion and a melting point adjustable in a range of 20 to 130 DEG C; and the material has excellent and stable thermophysical characteristics and shows good application prospects in fields with high requirements for high-grade heat dissipation, e.g., heat dissipation of high-power lasers, the utilization of industrial waste heat, solar power generation, cooling of fuel cells, photoelectric devices, micro-nano-electronicmechanical systems.

Description

technical field [0001] The invention relates to a high-performance composite phase-change material and a preparation method thereof, in particular to a high-performance composite phase-change material for high-power lasers and a preparation method thereof, belonging to the technical field of composite materials. Background technique [0002] With the development of high integration, high power, and miniaturization of electronic components, the heat generation and heat density of devices have risen sharply, which puts forward extremely stringent requirements for heat dissipation. In some high-power lasers, if the huge heat generated instantaneously by local hotspots is not transferred to the external environment in time, the overall temperature of the device will rise rapidly, the system performance will degrade and may even be damaged, causing immeasurable losses. [0003] In recent years, phase change energy storage technology and phase change energy storage materials have ...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 夏扬谢元锋吕宏姜珩李屹民
Owner GRIMAT ENG INST CO LTD
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