Surface modified SiC reinforced aluminum-based composite material and preparation method thereof

A technology of surface modification and composite materials, which is applied in the field of surface modified SiC reinforced aluminum matrix composite materials and its preparation, which can solve the problems of low wear resistance, performance difference, and low strength of composite materials, and achieve uniform distribution of structures and forming good sex effect

Inactive Publication Date: 2019-06-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although SiC is uniformly dispersed in the aluminum matrix in the composite material of the invention, the interfacial bonding inside the composite material is poor, which affects the performance of the composite material
[0005] Wang Kai, Liu Changming, Yuan Shaobo et al.’s paper “Microstructure and Properties of Centrifugal Casting Composite Disc-shaped Parts” prepared a SiC particle-reinforced ZL104 composite disc-shaped part with a SiC content of 15% by centrifugal casting method, and centrifugal casting can realize reinforcement The redistribution of particles in the matrix alloy, but due to the difference in radial position (the particle volume fraction increases from 11% to 23.5% in the radial direction), the performance of each position is also different
[0006] The uneven dispersion of SiC in the traditional silicon carbide-reinforced aluminum matrix composites in the aluminum matrix will lead to low strength of the composite material, and the single SiC structure will make the surface of the composite material weakly bonded to the aluminum matrix, resulting in lower wear resistance In order to solve the above problems, the present invention uses laser sintering to modify the surface of SiC porous ceramics to obtain a SiC whisker layer to improve the wear resistance of aluminum matrix composites, and adopts SiC porous ceramics combined with vacuum high-pressure impregnation methods to ensure that the aluminum matrix composites Strength of

Method used

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  • Surface modified SiC reinforced aluminum-based composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] (1) Clean the porous carbon foam ultrasonically for 30 minutes, and dry it in an oven at 100° C. for 5 hours before use;

[0024] (2) Place the porous carbon foam in (1) in the main temperature zone of the CVI tube furnace, raise it to 1100 °C at 10 °C / min, press CH 3 SiCl 3 :H 2 : Ar is (1:10:9) ratio into Ar, H 2 、CH 3 SiCl 3 , keep the pressure in the tube furnace at 500Pa, deposit for 13h, and finally cool down to room temperature at a rate of 5°C / min to obtain a carbon foam-supported SiC preform;

[0025] (3) Put the SiC prefabricated body supported by carbon foam into a muffle furnace, keep it warm at 650°C for 6 hours, and remove the carbon foam skeleton by oxidation to obtain a SiC porous ceramic body;

[0026] (4) Precursor impregnation and pyrolysis (PIP) of the SiC porous ceramic body: the impregnation solution is polycarbosilane (PCS) xylene solution, the vacuum degree of the impregnation tank is 10Pa, pressurized to 1.8MPa, and maintained at high press...

Embodiment 2

[0031] (1) Clean the porous carbon foam ultrasonically for 30 minutes, and dry it in an oven at 100° C. for 5 hours before use;

[0032] (2) Place the porous carbon foam in (1) in the main temperature zone of the CVI tube furnace, raise it to 1200 °C at 5 °C / min, press CH 3 SiCl 3 :H 2 : Ar is the ratio of (1:10:10) into Ar, H in sequence 2 、CH 3 SiCl 3 , keep the pressure in the tube furnace at 300Pa, deposit for 12h, and finally cool down to room temperature at a rate of 3°C / min to obtain a carbon foam-supported SiC preform;

[0033] (3) Put the SiC prefabricated body supported by carbon foam into a muffle furnace, keep it warm at 700°C for 6 hours, and remove the carbon foam skeleton by oxidation to obtain a SiC porous ceramic body;

[0034] (4) Precursor impregnation and pyrolysis (PIP) of the SiC porous ceramic body: the impregnation solution is polycarbosilane (PCS) xylene solution, the vacuum degree of the impregnation tank is 6Pa, pressurized to 1.5MPa, and mainta...

Embodiment 3

[0039] (1) Clean the porous carbon foam ultrasonically for 30 minutes, and dry it in an oven at 100° C. for 5 hours before use;

[0040] (2) Place the porous carbon foam in (1) in the main temperature zone of the CVI tube furnace, raise it to 1050 °C at 6 °C / min, press CH 3 SiCl 3 :H 2 : Ar is (1:10:9) ratio into Ar, H 2 、CH 3 SiCl 3 , keep the pressure in the tube furnace at 320Pa, deposit for 14h, and finally cool down to room temperature at a rate of 4°C / min to obtain a carbon foam-supported SiC preform;

[0041] (3) Put the SiC prefabricated body supported by carbon foam into a muffle furnace, keep it warm at 620°C for 6 hours, and remove the carbon foam skeleton by oxidation to obtain a SiC porous ceramic body;

[0042] (4) Precursor impregnation and pyrolysis (PIP) of the SiC porous ceramic body: the impregnation solution is polycarbosilane (PCS) xylene solution, the vacuum degree of the impregnation tank is 6Pa, pressurized to 2MPa, and maintains the high pressure ...

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Abstract

The invention discloses a surface modified SiC reinforced aluminum-based composite material and a preparation method thereof. The surface modified SiC reinforced aluminum-based composite material is characterized by taking a metal aluminum as a matrix and taking a surface modified SiC porous ceramic as a reinforcement; the preparation method includes the steps that firstly SiC is deposited on a carbon foam substrate through a CVI method; a carbon foam framework is removed through an oxidation method to obtain a SiC porous ceramic blank body; the SiC porous ceramic is further obtained through aPIP method; then porous SiC whiskers are prepared on an outer layer of the SiC porous ceramic through laser sintering; and finally the SiC reinforced aluminum-based composite material is prepared through high-pressure infiltration. The surface-modified SiC reinforced aluminum-based composite material is uniform in structure distribution and good in forming property, and due to surface modification, the strength of the composite material is ensured and the wear resistance of the composite material is improved. By means of the surface modified SiC reinforced aluminum-based composite material, the problems that SiC of a traditional silicon carbide reinforced aluminum-based composite material is not uniformly dispersed in an aluminum matrix, the wear resistance is poor are solved, and the surface modified SiC reinforced aluminum-based composite material can be widely applied to bearing structural parts in the aerospace field.

Description

technical field [0001] The invention relates to the field of preparation of aluminum-based composite materials, in particular to a surface-modified SiC reinforced aluminum-based composite material and a preparation method thereof. Background technique [0002] In order to achieve the purpose of reducing fuel consumption and reducing exhaust pollution, in addition to improving vehicle power, vehicle weight reduction is also one of the tasks that major car companies must complete. The brake drum is part of the wheel end assembly and is an unsprung weight. Reducing the unsprung weight by 1Kg is equivalent to reducing the sprung weight by 3-5Kg, so reducing the weight of the brake drum is one of the important ways to reduce the weight of the vehicle. The brake drum and the brake shoe cooperate to realize the braking function. When the brake shoe is in contact with the friction surface of the brake drum, the brake drum not only has to bear severe friction and wear and a large to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C32/00C22C21/00
Inventor 李斌斌毛帮笑王兴邦黄海泉袁小森
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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