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A method for improving the thermal conductivity of magnesium-based composite materials with nano-diamond and magnesium-based composite materials

A nano-diamond and composite material technology is applied in the field of nano-diamond to improve the thermal conductivity of magnesium-based composite materials, and in the field of magnesium-based composite materials, to achieve the effects of improving thermal insulation effect, eliminating internal stress and dislocation, and improving thermal conductivity.

Active Publication Date: 2020-11-13
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a method for improving the thermal conductivity of magnesium-based composite materials with nano-diamonds and magnesium-based composite materials; Thermal Conductivity of Magnesium-Based Alloys

Method used

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  • A method for improving the thermal conductivity of magnesium-based composite materials with nano-diamond and magnesium-based composite materials
  • A method for improving the thermal conductivity of magnesium-based composite materials with nano-diamond and magnesium-based composite materials
  • A method for improving the thermal conductivity of magnesium-based composite materials with nano-diamond and magnesium-based composite materials

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Experimental program
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Effect test

Embodiment 1

[0052] Weigh 0.1g of nano-diamond particles, 99.9g of ZK60 magnesium alloy powder, pour about 250mL of absolute ethanol into a 500mL beaker, and use an ultrasonic mixer to evenly disperse the nano-diamond particles into absolute ethanol. The ultrasonic mixing time is 20min. Slowly add ZK60 powder into the dispersed nano-diamonds, stir for 50 minutes, place in a drying oven to keep warm at 30°C, and ventilate and dry for 24 hours to obtain a mixed powder in which nano-diamonds are uniformly dispersed in ZK60.

[0053] Step 2. Pour the mixed powder prepared in step 1 into a ball mill jar with a ball-to-material ratio of 20:1, and add 1-2 mL of alcohol at the same time. The mixed powders were ball-milled using a planetary ball mill model DYXQM-12L. Set the rotating speed of the ball mill to 200rmp / min, and the ball milling time to 200min. In order to ensure safety and prevent explosions, an intermittent ball mill with forward rotation for 15 minutes, reverse rotation for 15 minu...

Embodiment 2

[0059] Weigh 0.05g of nano-diamond particles and 99.95g of ZK60 magnesium alloy powder as reaction raw materials; other parts in this embodiment are the same as in Embodiment 1.

Embodiment 3

[0061] Weigh 0.15g of nano-diamond particles and 99.85g of ZK60 magnesium alloy powder as reaction raw materials; other parts in this embodiment are the same as in Embodiment 1.

[0062] The magnesium-based composite material samples reinforced by different mass fractions of nano-diamonds prepared in Example 1, Example 2 and Example 3 were subjected to five thermal cycles respectively, and the results were as follows: Figure 4 , 5 shown.

[0063] Figure 4 Be the matrix magnesium alloy of ZK60 magnesium alloy, embodiment 1, embodiment 2 and embodiment 3 and the relationship between the size change and temperature response of the magnesium-based composite material, as can be seen from the figure, the dimensional stability of the added material along with the nano-diamond is obtained improved.

[0064] Figure 5 It is the effect of the amount of nano-diamond added on ZK60 magnesium alloy, Example 1, Example 2 and Example 3 on the thermal expansion properties of the material...

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Abstract

The invention discloses a method for improving thermal conductivity of a magnesium-based composite material by nano diamond and the magnesium-based composite material. The preparation method comprisesthe steps of firstly, uniformly dispersing the nano diamond in a magnesium alloy matrix by an ultrasonic dispersion method, sintering ball-milled powder in a vacuum hot-pressing sintering furnace toobtain a sintered blank, increasing diamond activity at a nano level by high-temperature and high-pressure treatment, and further forming a layer of carbide between the nano diamond and the magnesiumalloy matrix. Therefore, the interface bonding strength is improved, interface defects are reduced, and the interface thermal conductivity is improved. The preparation method is simple to operate andeasy to realize, and the slight carbonization reaction between the nano diamond and the magnesium alloy matrix is realized through high temperature and high pressure. The magnesium-based composite material prepared by the method has the advantages that on one hand, the diamond particle reinforced magnesium-based composite material obtains high thermal conductivity, has low thermal expansion coefficient matched with a semiconductor material, and has good application prospects.

Description

【Technical field】 [0001] The invention belongs to the scientific field of magnesium-based alloy materials, and in particular relates to a method for improving the thermal conductivity of magnesium-based composite materials by nano-diamonds and the magnesium-based composite materials. 【Background technique】 [0002] Magnesium and magnesium alloys have been widely researched and applied because of their high specific strength and specific stiffness, as well as their high shock absorption and noise reduction capabilities. In addition, magnesium alloys have good die-casting properties, electromagnetic shielding properties, thermal conductivity, electrical conductivity, machinability, regeneration and other advantages, making them have broad application prospects in 3C communication electronics, aerospace, national defense and military industries. Although the application of magnesium and magnesium alloys in the fields of 3C products, communication electronics, and aerospace can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C23/00C22C26/00C22F1/06
CPCC22C1/055C22C23/00C22C26/00C22F1/06
Inventor 马鸿斌王金辉金培鹏张鹏时博魏福安
Owner QINGHAI UNIVERSITY
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