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Proximal melting state diffusion technology for preparing SiC fiber/aluminum base composite material

A technology of aluminum-based composite materials and diffusion technology, which is applied in the field of material science, can solve the problems of material performance limitations, low solubility, and difficult control of harmful interface reactions, and achieve the effect of improving mechanical properties

Inactive Publication Date: 2009-03-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the solubility of O in Al is very low, and this layered oxide film is difficult to completely eliminate under vacuum hot-pressing conditions, but remains in the form of fragments, which hinders the diffusion bonding between the substrates.
At the same time, due to the long-term diffusion bonding process of 2 hours, the excessive interface reaction is also difficult to control.
[0003] In conclusion, the preparation of SiC f / 5A02 Aluminum alloy matrix composites The harmful reaction at the interface produced by the solid-state hot pressing method and hot die casting method is difficult to control, resulting in a great limitation in the performance of the material

Method used

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  • Proximal melting state diffusion technology for preparing SiC fiber/aluminum base composite material
  • Proximal melting state diffusion technology for preparing SiC fiber/aluminum base composite material
  • Proximal melting state diffusion technology for preparing SiC fiber/aluminum base composite material

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Effect test

Embodiment 1

[0019] The substrate used is 5A02 aluminum alloy foil with a thickness of about 100 μm; the reinforcement is W-core SiC fiber with a diameter of 100 μm, and the surface is covered with a carbon-rich layer with a thickness of 1.5 μm. The SiC fiber-reinforced Al-based composite material is prepared by the foil-fiber-foil method. The fibers are wound on a cylindrical drum at a certain distance on a special wire-discharging machine and arranged to form a prefabricated belt, which is fixed with an adhesive and dried. Thin slices of the same size as aluminum foil are alternately put into pure titanium sheaths to make SiC fiber and aluminum alloy prefabricated bodies, and then put into a hot-pressing mold for vacuum hot-pressing using a near-melt diffusion process. The specific process is:

[0020] 1) Pressurize under solid state conditions to fully contact the SiC fiber and the aluminum matrix; pressurize under solid state conditions to fully contact the SiC fiber and the aluminum ma...

Embodiment 2

[0028] The present embodiment and embodiment 1 preparation method and content are basically the same, and its difference mainly lies in:

[0029] The hot pressing parameters are 550°C / 30 minutes / 20MPa, 620°C / 10 minutes / 10MPa, 550°C / 30 minutes / 20MPa.

Embodiment 3

[0031] This embodiment is basically the same as the embodiment 1, the difference mainly lies in: the holding time and pressurization time of the solid-liquid phase interval are shorter, and the pressure is higher. The specific parameters are 600°C / 20 minutes / 30MPa, 630°C / 7 minutes / 0MPa, and 600°C / 20 minutes / 30MPa.

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Abstract

The invention discloses an approximate molten state diffusion technology for preparing SiC fiber / aluminum matrix composites, which is characterized in that SiC fiber and an aluminum alloy preform are pressurized in a solid state to ensure full contact of the SiC fiber and an aluminum matrix; and then the temperature of the composite is kept at the solidus of Al alloy so that the matrix is kept in a semi-molten state, which damages a continuous structure of an oxide film and also increases the liquidity of the aluminum matrix. The approximate molten state diffusion technology combines the advantages of the traditional solid hot pressing process and the liquid process and not only propels the bonding between matrixes, but also effectively inhibits the formation of harmful products of an interface so as to remarkably improve the interface state of the SiC fiber / aluminum matrix composite and enhance the mechanical performance of the composite.

Description

Technical field: [0001] The invention relates to material science, and in particular provides a near-melt state diffusion process for preparing SiC fiber / aluminum matrix composite material. Background technique: [0002] Compared with traditional materials, SiC fiber-reinforced Al-based composites by chemical vapor deposition (CVD) have higher specific strength and specific stiffness, and have broad application prospects in high-tech fields such as aerospace. At present, the most mature method for preparing this kind of composite material is the thermal mold casting method (see reference 1: Mitt., MA, Meishan, Foreign Missile and Space Vehicle, 1991; 11, P65-71; reference 2: Xu Xiaocheng, aerospace Technical Report on Overseas Investigation, 1992; 2: 204-215) and solid-state diffusion method (see Reference 3: Zhu Zuming, Guo Yanfeng, Shinan Lin, Journal of Materials Research, 2002; 16(1): 59-66; Reference 4 Zhu Zuming, Shinan Lin , Acta Metall Sinica, 1996; 32(9): 998-1008;...

Claims

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Application Information

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IPC IPC(8): C22C47/00C22C101/14
Inventor 冀鸰王玉敏石南林杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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