Preparation method of high-volume-fraction diamond/aluminum composite material with heat conduction function

A functional composite material and high volume fraction technology, applied in the field of composite material preparation, can solve the problems of large size limitation, insufficient thermal conductivity, and large equipment dependence

Active Publication Date: 2011-11-23
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method of preparing diamond / aluminum composite materials by pressure infiltration method has good density, its thermal conductivity is generally less than 300W / m.K, and this method is highly dependent on equipment and has large size restrictions.
In short, the preparation process of diamond / aluminum composites needs to be perfected, and the interface structure still needs comprehensive and in-depth research and effective control methods.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Weigh 300g of artificial diamond particles with a particle size of 91-106 μm (140 / 170 mesh) or 106-125 μm (120 / 140 mesh), a cubo-octahedral structure, and a grade of SMD30 or MBD4, and use 1mol / L Wash with dilute hydrochloric acid. Soak the diamond particles in acetone for 0.5 hour and wash them repeatedly, put them in an oven and heat them to 180°C for 2 hours to dry. Then diamond powder and 400-mesh Ti powder are mixed evenly according to the ratio of bulk volume 1:1, and then put into a crucible of 100×100×60mm, and 160gNaCl and 85gBaCl 2 Mix evenly to prepare mixed salt, which is covered on diamond particles mixed with metal powder. Heat to 950°C in a resistance furnace and keep it warm for 1 hour. Then take out the powder, heat and boil the powder in deionized water, remove the mixed salt, dry the remaining powder, put it into a 180-mesh sieve, vibrate the sieve with a vibrating sieve for 30 minutes, and wash the diamond powder on the sieve with acetone wash...

Embodiment 2

[0024](1) Weigh 300g of artificial diamond particles with a particle size of 150-175 μm (80 / 100 mesh) or 125-150 μm (100 / 120 mesh), a cubo-octahedral structure, and a grade of SMD30 or MBD4, and use 1mol / L Wash with dilute hydrochloric acid. Soak the diamond particles in acetone for 0.5 hour and wash them repeatedly, put them in an oven and heat them to 180°C for 2 hours to dry. Then put diamond powder and 400-mesh Cr powder into a crucible of 100×100×60mm according to the ratio of bulk volume 1:1, mix 160gNaCl and 85gBaCl2 evenly to prepare mixed salt, and cover the diamond mixed with metal powder on the particles. Heat to 950°C in a resistance furnace and keep it warm for 1 hour. Then take out the powder, heat and boil the powder in deionized water, remove the mixed salt, dry the remaining powder, put it into a 180-mesh sieve, vibrate the sieve with a vibrating sieve for 30 minutes, and wash the diamond powder on the sieve with acetone Wash and dry.

[0025] (2) Weigh 27...

Embodiment 3

[0028] (1) Weigh 300g of artificial diamond particles with a particle size of 63 / 75 μm (200 / 230 mesh) or 75-91 μm (170 / 200 mesh), a cubo-octahedral structure, and a grade of SMD30, and use 1mol / L dilute hydrochloric acid cleaning. Soak the diamond particles in acetone for 0.5 hour and wash them repeatedly, put them in an oven and heat them to 180°C for 2 hours to dry. Then put the diamond powder and 400 mesh Cr powder into a crucible of 100×100×60mm after mixing uniformly according to the ratio of bulk volume 1:1, and mix 120gNaCl and 120gBaCl 2 Mix evenly to prepare mixed salt, which is covered on diamond particles mixed with metal powder. Heat to 900°C in a resistance furnace and keep it warm for 1 hour. Then take out the powder, heat and boil the powder in deionized water, remove the mixed salt, dry the remaining powder, put it into a 180-mesh sieve, vibrate the sieve with a vibrating sieve for 30 minutes, and wash the diamond powder on the sieve with acetone Wash and dr...

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Abstract

The invention belongs to the technical field of preparation of composite materials, and relates to a preparation method of a high-volume-fraction diamond / aluminum composite material with heat conduction function. The diamond / aluminum alloy interface binding performance is improved by metallizing the diamond grain salt bath coated surface, using gel injection molding prefabricated body technique by adding high-temperature aluminum phosphate adhesive, improving the constituent of aluminum alloy and other means. The composite material is prepared by a non-pressure impregnation technique which has the advantages of low cost and is simple to operate and implement. The diamond / aluminum composite material has uniform and compact microstructure, and has favorable diamond / aluminum alloy interface binding performance; and the density is 3.17g / cm<3>, the heat conductivity is up to 518W / m.K, the thermal expansion coefficient is only 4.61*10<-6> / K, the bending strength is 306Mpa, and the Young's modulus is 280GPa. The invention completely satisfies the requirements of superhigh heat conductivity, low density and low thermal expansion coefficient for the high-density electronic packaging material.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to a preparation method of a high volume fraction diamond / aluminum heat-conducting functional composite material. Background technique [0002] Thermal control is a crucial technical link in the design of space remote sensors, and it is one of the key factors that directly affect the accuracy, reliability and life of the system. If the thermal control material with high thermal conductivity is used as the optical-mechanical structure of the space remote sensor or the carrier of the device, it will significantly reduce the load on the active heating and temperature control of the system, thereby reducing the power consumption of the aerospace optoelectronic information system and improving the efficiency of thermal control. Uniformity, improved image quality in thermal space environments. Diamond / aluminum composite material is a new type of metal-based thermal c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C21/00B22D23/04
Inventor 张磊崔岩
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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