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A kind of composite phase change material for LED thermal interface and preparation method thereof

A composite phase change material and thermal interface technology, which is applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of small phase change enthalpy, small thermal conductivity, and narrow phase change temperature threshold, so as to reduce the contact heat. The effect of resistance, damage prevention and rapid transfer

Inactive Publication Date: 2018-04-24
东莞市益飞迅光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are still many shortcomings in the performance of the interface thermal control materials in the prior art: for example, the thermal conductivity is not large, the contact thermal resistance cannot be effectively reduced, the phase change enthalpy is small, the phase change temperature threshold is narrow, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] A method for preparing a composite phase-change material for an LED thermal interface, the steps of which are:

[0032] 1) Material preparation: mix all raw materials evenly;

[0033] 2) Sample preparation: Melt the uniformly mixed raw materials above under a protective atmosphere, and then cool to room temperature.

[0034] Preferably, step 2) is specifically: put the mixed raw materials into the smelting furnace and pass in protective gas, raise the temperature from room temperature to 600-800°C, then keep it warm for 20min-1h, then turn off the heating power and cool down to room temperature naturally.

[0035] The protective gas is at least one of nitrogen, helium, neon, argon and xenon.

[0036] Preferably, step 2) specifically includes: putting the mixed raw materials into a smelting furnace and introducing a protective gas, raising the temperature from room temperature to 700°C, keeping the temperature for 30 minutes, and then turning off the heating power and c...

Embodiment 1

[0039] Preparation of raw materials: Take various raw material powders with a purity of more than 99.9%, in terms of mass percentage, 44.51% bismuth, 17.47% tin, 35.77% indium, 0.55% antimony, and 1.7% colloidal graphite powder, add them to a corundum crucible, mix and stir. Sample preparation: Turn on the power switch of the heating and melting furnace, put the mixed raw materials into the melting furnace and pass nitrogen gas, raise the temperature of the melting furnace from room temperature to 700°C in 2.5 hours, then keep at 700°C for half an hour, and then turn off the heating Naturally cool to room temperature after power on.

[0040] The melting point of the thermal interface material prepared in this example was tested by DSC-Q20, and the obtained test result was: 78.9°C.

Embodiment 2

[0042] Preparation of raw materials: Take various raw material powders with a purity of more than 99.9%, by mass percentage, bismuth 34.75%, tin 13.47%, indium 49.53%, antimony 0.55%, colloidal graphite powder 1.7%, add to a corundum crucible, mix and stir. The sample preparation process is the same as in Example 1.

[0043] The melting point of the thermal interface material prepared in this example was tested by DSC-Q20, and the obtained test result was: 61.6°C.

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Abstract

The invention discloses a composite phase change material for an LED thermal interface and a preparation method thereof. The composite phase change material consists of the following raw materials by mass percent: 18-45% of bismuth, 10-27% of tin, 35-55% of indium, 0-1% of antimony, 0-2% of gallium and the balance of colloidal graphite powder. Or, the composite phase change material consists of the following raw materials by mass percent: 44.51% of bismuth, 17.47% of tin, 35.77% of indium, 0.55% of antimony and the balance of colloidal graphite powder. Or, the composite phase change material consists of the following raw materials by mass percent: 34.75% of bismuth, 13.47% of tin, 49.53% of indium, 0.55% of antimony and the balance of colloidal graphite powder. Or, the composite phase change material consists of the following raw materials by mass percent: 18.97% of bismuth, 26.32% of tin, 51.48% of indium, 1.55% of gallium and the balance of colloidal graphite powder. The preparation method of the composite material comprises: 1) preparing materials; and 2) preparing samples: smelting uniformly mixed materials under protective atmosphere, and cooling to room temperature. The composite phase change material for the LED thermal interface is high in heat conductivity coefficient, wide in phase change temperature threshold, large in enthalpy of phase change and stable in performance, and can effectively lower thermal contact resistance.

Description

technical field [0001] The invention relates to a composite phase-change material used for an LED thermal interface and a preparation method thereof. Background technique [0002] Heat transfer and heat storage materials are the basis for heat conversion, transmission and storage. Currently commonly used heat transfer and heat storage materials include water / steam, heat transfer oil, molten salt, and liquid metal. Among them, metals and alloys have attracted extensive attention from research at home and abroad due to their high thermal conductivity, wide temperature range, long service life, and stable performance. The low-melting-point alloy composed of low-melting-point metal elements has physical properties such as high density, low melting point and high boiling point, and is a potential medium-low temperature phase change heat storage material and heat transmission medium. [0003] A considerable number of electronic or electrical products often cause damage to the ci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/06
Inventor 李静张定
Owner 东莞市益飞迅光电科技有限公司
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