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Preparation method of diamond/metal-based composite material with high volume fraction

A technology of high volume fraction and composite materials, which is applied in the field of preparation of high volume fraction diamond/metal matrix composite materials, which can solve the problems of affecting the shape and dimensional accuracy of casting preforms, affecting the shape and dimensional accuracy of preforms, and difficulty in degassing, etc. , to achieve the effect of low process equipment requirements, low energy consumption and simple operation

Active Publication Date: 2014-08-13
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor wettability of water-based silica sol on the surface of diamond particles, when this technology is applied, it will be difficult to degas during the slurry preparation process, which will eventually affect the shape and dimensional accuracy of the cast preform, and the preform needs post-processing
At the same time, the pressure of liquid die forging is too high (greater than 20MPa), which will also affect the shape and dimensional accuracy of the preform

Method used

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  • Preparation method of diamond/metal-based composite material with high volume fraction
  • Preparation method of diamond/metal-based composite material with high volume fraction
  • Preparation method of diamond/metal-based composite material with high volume fraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Raw materials: Analytical pure ethyl orthosilicate (28.8% silica content), commercially available MBD6 diamond coarse powder (particle size 150-180 microns), diamond fine powder (particle size 8-20 microns) and aluminum alloy block (silicon 7%, magnesium 0.5%, the balance is Al).

[0041] 1. Preparation of hydrolyzate

[0042] Mix 3 mol of absolute ethanol, 1 mol of water and 0.05 mol of concentrated hydrochloric acid (mass concentration 36.5%) at room temperature, heat up to 45°C and keep warm, then add 1 mol of tetraethyl orthosilicate under magnetic stirring, stop heating after hydrolysis for 1 hour; After reaching room temperature, it was allowed to stand for 24 hours to obtain a hydrolyzate.

[0043] 2. Preparation of slurry

[0044] Put 1.5g of fine diamond powder and 3.5g of coarse diamond powder into a container and mix them uniformly to obtain a mixed powder, measure 0.6mL of the hydrolyzate prepared in step 1, and dilute the hydrolyzate and absolute ethanol ...

Embodiment 2

[0050] Raw materials: Analytical pure ethyl orthosilicate (28.8% silica content), commercially available MBD6 diamond coarse powder (particle size 150-180 microns), diamond fine powder (particle size 8-20 microns) and aluminum alloy block (silicon 7%, magnesium 0.5%, the balance is aluminum).

[0051] The preparation process of this example is the same as that of Example 1, except that the calcining temperature of the prefabricated green body in the argon atmosphere in step 3 is 750°C, and the volume fraction of the reinforcement in the prepared porous diamond preform is 76%; step 4 The infiltration time of medium vacuum pressure infiltration is 15min. The room temperature thermal conductivity of the diamond / aluminum matrix composite material prepared in this example is 362 W / m·K, and the average linear expansion coefficient is 6.5 ppm / K (30-200° C.).

Embodiment 3

[0053] Raw materials: Analytical pure ethyl orthosilicate (28.8% silica content), commercially available MBD6 diamond coarse powder (particle size 150-180 microns), diamond fine powder (particle size 8-20 microns) and aluminum alloy block (Titanium 0.5%, the balance is aluminum).

[0054] The preparation process of this example is the same as that of Example 1, except that the calcining temperature of the prefabricated green body in the argon atmosphere in step 3 is 950° C., and the volume fraction of the reinforcement in the prepared diamond porous preform is 76%. The room temperature thermal conductivity of the diamond / aluminum matrix composite material prepared in this example is 470 W / m·K, and the average linear expansion coefficient is 6.0 ppm / K (30-200° C.).

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Abstract

The invention discloses a preparation method of a diamond / metal-based composite material with a high volume fraction. The preparation method comprises preparation of hydrolysate, preparation of a sizing agent, roasting of a prefabricated member, and vacuum low-pressure infiltration; and the process for each unit is as follows: firstly, preparing tetraethylortho silicate hydrolysate by taking tetraethylortho silicate as a precursor, taking absolute ethyl alcohol as a reaction solvent and taking acid as a catalyst; preparing a prefabricated blank by taking tetraethylortho silicate hydrolysate as an adhesive through a grouting and forming way, and roasting at a high temperature to obtain a diamond porous prefabricated member; and infiltrating a molten liquid into the diamond porous prefabricated member by adopting a vacuum low-pressure infiltration way to realize near net shape forming of the diamond / metal-based composite material. The prepared diamond / metal-based composite material has the advantages of being high in heat conduction, low in expansion, high in gas tightness, and the like, is simple in preparation process, low in cost and suitable for mass production.

Description

1. Technical field [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of a high volume fraction diamond / metal matrix composite material. 2. Background technology [0002] With the rapid development of semiconductor materials, especially the development plan of high-bandwidth semiconductors, the integration and heat generation of semiconductor components will increase greatly. This requires thermal management materials for electronic packaging to have higher thermal conductivity and matching thermal expansion coefficients to prevent heat accumulation from causing excessive temperature of electronic components and component failure due to thermal mismatch with packaging materials. Diamond / aluminum (copper / silver) matrix composites belong to the third generation of thermal management materials. Compared with the previous two generations of thermal management materials, diamond / aluminum (copper / silver) matrix comp...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C32/00B22D23/04
Inventor 蒋阳杨伟锋余亚岚童国庆仲洪海
Owner HEFEI UNIV OF TECH
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