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Preparation method and device of high-volume fraction and high-intensity aluminum silicon carbide composite material

A technology of high volume fraction and aluminum silicon carbide, which is applied in the field of high strength aluminum silicon carbide composite materials to prepare high volume fraction, can solve the problems of uneven grain distribution and uncontrollable alloy grain size, and achieve high density, Effect of improving mechanical properties and thermophysical properties

Active Publication Date: 2013-09-04
CHANGSHA AISIKE NEW MATERIAL SCI & TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a method of vacuum pressure aluminizing-directional thermal conductivity crystallite solidification technology to prepare large-sized aluminum carbide with high volume fraction, high density, high thermal conductivity and high strength. A silicon composite material method and its associated devices, which avoid the disadvantages of uncontrollable alloy grain size, uneven grain distribution, and pores in the material during the preparation process of the pressureless infiltration method and the vacuum pressure infiltration method during the furnace cooling process , so as to improve the mechanical properties and thermal physical properties of aluminum silicon carbide composites

Method used

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  • Preparation method and device of high-volume fraction and high-intensity aluminum silicon carbide composite material
  • Preparation method and device of high-volume fraction and high-intensity aluminum silicon carbide composite material
  • Preparation method and device of high-volume fraction and high-intensity aluminum silicon carbide composite material

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Effect test

Embodiment 1

[0030] Surface-treat the rectangular silicon carbide porous preform with a porosity of 37% and a thickness of 15mm, and then install the mold; place the mold with the porous silicon carbide preform in a vacuum pressure infiltration furnace, and evacuate until the pressure in the furnace is 10Pa , replace the atmosphere in the furnace with argon, raise the temperature to 750°C, and keep it warm at 750°C for 2 hours; turn on the vacuum system, degas for 20 minutes at a temperature of 750°C, and a pressure of 15Pa in the furnace; add aluminum melt, and add gas and liquid outside Under mixing pressure, the aluminum melt is infiltrated into the porous silicon carbide preform, and the temperature is kept at 750° C. for 1 minute during aluminizing. The heat pipe is in close contact with one end of the mold, and the remaining surface of the mold is wrapped with an insulating layer; the temperature of the end surface of the mold is cooled at a rate of 600°C / min, and the cooling rate of ...

Embodiment 2

[0032] Surface treatment the porous SiC preform with a porosity of 50% and a thickness of 20mm and install the mold; place the mold with the porous SiC preform in a vacuum pressure infiltration furnace, and evacuate until the pressure in the furnace is 10Pa , replace the atmosphere in the furnace with argon, raise the temperature to 750°C, and keep warm at 750°C for 2 hours; turn on the vacuum system, degas for 1 minute at a temperature of 750°C and a pressure of 0.1Pa in the furnace; add aluminum melt, and add gas outside Under the liquid mixing pressure, the aluminum melt is infiltrated into the porous silicon carbide preform, and the temperature is maintained at 750°C for 2 minutes during aluminizing. The heat pipe is in close contact with one end of the mold, and the remaining surface of the mold is wrapped with an insulating layer; the temperature of the end surface of the mold is cooled at a rate of 400°C / min, and the cooling rate of the rest of the mold is less than 100°...

Embodiment 3

[0034]The porosity is 25%, the silicon carbide porous preform with thickness of 15mm is subjected to surface treatment, and then molded; the mold with porous silicon carbide preform is placed in a vacuum pressure infiltration furnace, and the vacuum is evacuated until the pressure in the furnace is 1.0 Pa, the atmosphere in the replacement furnace is argon, the temperature is raised to 700°C, and the temperature is kept at 700°C for 4 hours; the vacuum system is turned on, and the gas is degassed at 700°C and 50Pa in the furnace for 30 minutes; Under the pressure of liquid mixing, the 102 alloy aluminum melt is infiltrated into the porous silicon carbide preform, and the temperature is maintained at 700 ° C for 1 minute during aluminizing. The heat pipe is in close contact with one end of the mold, and the remaining surface of the mold is wrapped with an insulating layer; the temperature of the end surface of the mold is cooled at a rate of 800°C / min, and the cooling rate of th...

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Abstract

The invention discloses a preparation method and device of a high-volume fraction and high-intensity aluminum silicon carbide composite material. A silicon carbide porous preformed blank with the porosity of 20%-80% is degassed in vacuum in a mold with an insulation device, then melt aluminum liquid permeates into pores of the silicon carbide porous preformed blank under the co-action of a capillary force, an external pressure and a solidification contraction force, and then heat in the melt aluminum liquid is quickly conducted out by using a directional heat conduction technique so that the melt aluminum liquid is solidified along a direction opposite to the heat conduction direction; the melt aluminum liquid forms a great number of microcrystal in the micro-pores, and a stretch prestress is generated on the surface of a SiC frame after the melt aluminum liquid is solidified completely, and thus the mechanical properties, density and thermo-physical properties of the material are greatly improved; the method is simple in technique; and the prepared material has high density, good mechanical properties, high heat conductivity, low thermal expansion coefficient and good dimensional stability.

Description

technical field [0001] The invention belongs to the technical category of forming metal matrix composite materials, and in particular provides a method and a device for preparing aluminum silicon carbide composite materials with high volume fraction and high strength. Background technique [0002] Aluminum silicon carbide composite materials are widely used in aerospace, special Structures and materials of equipment, precision instruments, etc., and electronic packaging materials. At present, the volume fraction of silicon carbide in aluminum silicon carbide composite materials used as structural materials is usually lower than 20%, and it is prepared by powder metallurgy method and stirring casting method. The materials prepared by these two methods have poor compactness and low thermal conductivity. , the thermal expansion coefficient is high, and it cannot fully meet the requirements for structural materials in special fields such as aerospace and precision instruments. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C32/00C22C21/00C22C1/10
Inventor 崔葵馨金胜明杜吉喜
Owner CHANGSHA AISIKE NEW MATERIAL SCI & TECHCO
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