A method for preparing diamond/aluminum composite material by liquid-solid separation

A technology of aluminum composite materials and diamond, which is applied in the field of high thermal conductivity diamond/aluminum composite materials, can solve the problems of difficult popularization and application and high manufacturing cost, and achieve the effect of increasing compactness and improving thermal conductivity

Active Publication Date: 2021-08-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diamond / aluminum composite material prepared by liquid-solid separation technology has the characteristics of high precision, high density, and high thermal conductivity, which completely solves the problems of high manufacturing cost and difficulty in popularization and application of high-performance diamond / aluminum electronic packaging materials

Method used

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  • A method for preparing diamond/aluminum composite material by liquid-solid separation
  • A method for preparing diamond/aluminum composite material by liquid-solid separation
  • A method for preparing diamond/aluminum composite material by liquid-solid separation

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specific Embodiment approach 1

[0045] use figure 1 The liquid-solid separation system shown prepares a diamond / aluminum composite material with a diamond content of 30-70vol.%.

[0046] The diamond particles and the metal aluminum powder are mixed in a certain ratio (1:9-3:7) and mechanically mixed in a planetary ball mill for a mixing time of 1-48 hours to make a mixed powder.

[0047] The mixed powder is put into a cold-pressing mold, placed in a press and held at a pressure of 50-300MPa for 0.5-5 minutes to make a cold-pressed billet of a certain size.

[0048] The cold-pressed billet is directly placed in a special mold system with a liquid-solid separation channel. 2 Heating to 640-720° C. for 10-60 minutes under atmosphere protection conditions to prepare a liquid-solid mixed molten slurry in which diamond solid phase particles and liquid metal aluminum coexist.

[0049] The liquid-solid mixed molten slurry passes through the liquid-solid separation channel with a gap of 0.5-5mm in width, and under ...

specific Embodiment approach 2

[0052] This embodiment is different from the specific embodiment one in that:

[0053] Diamond particles and metallic aluminum powder are mechanically mixed in a 3D mixer.

[0054] The cold-pressed billet is heated under an inert gas protection atmosphere to prepare a liquid-solid mixed molten slurry.

[0055] The liquid-solid separation channel is a circular hole with a diameter of 0.5-5mm.

[0056] The layer-by-layer solidification of the composite material is realized by forced cooling with an external cold iron.

specific Embodiment approach 3

[0058] This embodiment is different from the specific embodiment one in that:

[0059] The cold-pressed billet is placed in the pass with H 2 After being heated to a liquid-solid mixed molten state in an atmosphere-protected heating furnace, it is transferred to a special mold system with a liquid-solid separation channel.

[0060] The layer-by-layer solidification of the composite material is achieved by forced air cooling.

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Abstract

The invention discloses a method for preparing a diamond / aluminum composite material with a high diamond content of 30-70vol.%. This technology draws on the characteristics of powder metallurgy and semi-solid forming technology: firstly, mechanically mix the diamond particles and metal aluminum powder according to a certain ratio (1:9-3:7); secondly, place the mechanically mixed powder in a certain Compress under pressure to make cold-pressed billets; again, heat the cold-pressed billets to a liquid-solid mixed-melt state (640-720°C) in a special mold system; then, the target amount of liquid phase in the liquid-solid mixed-melt slurry The directional extrusion separation process is carried out through the liquid-solid separation channel; finally, the remaining slurry is solidified layer by layer along the direction of heat loss and is made into a dense diamond / aluminum composite material with a diamond content of 30-70vol.% under continuous pressure holding. The short-process liquid-solid separation technology is a new method to achieve high density and high thermal conductivity diamond / aluminum composites, and it has important practical significance in reducing the cost of industrial applications.

Description

technical field [0001] The invention designs a low-cost method for preparing diamond / aluminum composite materials with high precision, high density and high thermal conductivity. Background technique [0002] The U.S. military reported that 55% of the reasons for the instability of electronic products are caused by temperature factors. If the heat cannot be conducted in time and the local temperature is too high, the electronic components will fail. Intel uses 10nm technology with a transistor density of 108 million / mm 2 , Such a huge transistor will release a lot of heat during the operation process, causing the integrated circuit to heat up. Heat dissipation technology will be the key bottleneck for future high-frequency high-temperature, blue-ray laser and other high-end electronic equipment applications. [0003] Electronic packaging is an important bridge connecting electronic chips and electronic devices to the external power system. It plays the role of heat conduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C26/00C22C21/00C22C1/10
CPCC22C26/00C22C21/00C22C1/1036C22C1/101C22C1/1073C22C1/1047
Inventor 周洪宇刘俊友李亚强郑文跃
Owner UNIV OF SCI & TECH BEIJING
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