Method for preparing diamond/aluminum composite material through liquid-solid separation technology

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

Active Publication Date: 2020-08-25
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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  • Method for preparing diamond/aluminum composite material through liquid-solid separation technology
  • Method for preparing diamond/aluminum composite material through liquid-solid separation technology
  • Method for preparing diamond/aluminum composite material through liquid-solid separation technology

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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 50-300 MPa 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 state slurry passes through the liquid-solid separation channel with a gap of 0.5-5mm in width, and...

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 the high diamond content of 30-70 vol.%. The technology uses the characteristics of powder metallurgy and a semi-solid forming process for reference: firstly, diamond particles and metal aluminum powder are blended according to the ratio of (1:9-3:7) and then mixed mechanically; secondly, the mechanically mixed powder is compressed at certain pressure to form a cold-pressed blank; thirdly, the cold-pressed blank is heated to a liquid and solid mixed molten state (640-720 DEG C) in a special mold system; fourthly, a target quantity of liquid phase in the liquid and solid mixed molten state slurry is directionally extruded for separation treatment through a liquid and solid separation passage; and finally, the residual slurry is solidified layer by layer in the heat dissipation direction and forms the compact diamond / aluminum composite material with the high diamond content of 30-70 vol.% in the process of continuous pressure maintaining. The short-process liquid and solid separation technology is a novel method for realizing preparation of the diamond / aluminum composite material with high compactness and high heat conductivity, and has important practical significance on the aspect of lowering industrial application cost.

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 Applications(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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