Process for preparing orienting-reinforced aluminum ¿Cbased composite material

An aluminum matrix composite material and directional reinforcement technology, applied in the field of metal matrix composite material preparation, can solve the problems of easy deformation of prefabricated blocks, uneven microstructure, serious interface reaction, etc. small effect

Inactive Publication Date: 2008-03-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is limited by the characteristics of the metal matrix composite material prepared by the liquid pressure infiltration method. During the squeeze casting process, the prefabricated block is prone to deformation, the surface roughness is large after casting infiltration, the microstructure is uneven, and the grain size is large and dense. Disadvantages such as serious interface reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment is a method for preparing a directionally reinforced aluminum matrix composite material. The steps and process conditions of the preparation method are as follows:

[0030] In this embodiment, the metal powder is an aluminum alloy component powder, and its composition is: by mass percentage, 20% Si powder with a particle size of 20 μm, 3% Cu powder with a particle size of 20 μm, and the rest Al powder with a particle size of 15 μm ;Short fibrous ceramic phase is Al 2 o 3 short fibre. Press Al 2 o 3 Short fiber: Al-20Si-3Cu aluminum alloy component powder = 1:6 mass ratio mixed to make aluminum matrix composite material powder, Al 2 o 3 Short fiber accounted for Al 2 o 3 10% of the total volume of short fibers and Al-20Si-3Cu aluminum alloy component powder. Use polyvinyl alcohol with a degree of polymerization of 1750 to prepare a 4% polyvinyl alcohol solution. According to the mass ratio of aluminum-based composite material powder: polyvinyl al...

Embodiment 2

[0032] In this embodiment, the metal powder is Al powder with a particle size of 60 μm. The short fibrous ceramic phases are SiC whiskers. According to SiC whisker: Al powder=63.6:216 mass ratio is mixed and made into aluminum matrix composite material powder, and SiC whisker accounts for 20% of the total volume of SiC whisker and Al powder. Use polyvinyl alcohol with a degree of polymerization of 2000 to prepare a 5% polyvinyl alcohol solution. According to the mass ratio of polyvinyl alcohol solution: aluminum matrix composite material powder = 6.5:100, add polyvinyl alcohol solution to the aluminum matrix composite material powder slurry, mix and stir evenly, and make aluminum matrix composite material powder slurry . Then put the aluminum-based composite material powder slurry into a directional extrusion die for directional extrusion, the inner diameter of the nozzle of the directional extrusion die is 0.8mm, and obtain the aluminum-based composite material green filame...

Embodiment 3

[0034] In this embodiment, the metal powder is 2024 aluminum alloy powder with a particle size of 30 μm. The short fibrous ceramic phase is Si 3 N 4 whiskers. Press Si 3 N 4 Whiskers: 2024 aluminum alloy powder = 159:135 mass ratio mixed to form aluminum matrix composite material powder, Si 3 N 4 Whiskers occupy Si 3 N 4 50% of the total volume of whiskers and 2024 aluminum alloy powder. Use polyvinyl alcohol with a degree of polymerization of 1870 to prepare a polyvinyl alcohol solution with a concentration of 4.5%. According to the mass ratio of polyvinyl alcohol solution: aluminum-based composite material powder = 10:100, add polyvinyl alcohol solution to the aluminum-based composite material powder slurry, mix and stir evenly, and make aluminum-based composite material powder slurry . Then put the aluminum matrix composite material powder slurry into a directional extrusion die for directional extrusion, the inner diameter of the nozzle of the directional extrusi...

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Abstract

The present invention relates to preparation process of directional enhanced aluminum-base composite material. The process includes the following steps: mixing metal powder, short fiber ceramic phase and PVA solution to obtain composite material slurry; directionally extruding the composite material slurry in some mold to prepare short fiber ceramic phase directionally enhanced aluminum-base composite material wire; stoving, superposing in the length direction and pressure forming to form aluminum-base composite material block; and final sintering in hydrogen or argon atmosphere or in a vacuum sintering furnace to obtain short ceramic fiber directional enhanced aluminum-base composite material. The composite material has wide ceramic phase content range, less interface reaction to the aluminum alloy base, high directional degree and other advantages.

Description

technical field [0001] The invention relates to the field of metal-matrix composite material preparation, in particular to a preparation method of directional reinforced aluminum-matrix composite material. Background technique [0002] As early as the 1980s, people have realized that the distribution of reinforcements such as whiskers or short fibers in the matrix of metal matrix composites, if the three-dimensional random state becomes a unidirectional arrangement, the reinforcement of whiskers or short fibers The effect will be greatly improved. At present, although the secondary processing of aluminum matrix composites (such as rolling, extrusion, etc.) can achieve the orientation and orderly arrangement of whiskers or short fibers in the vertical direction of force, this method whiskers or short fibers The degree of orientation is not high, and it is easy to cause damage to whiskers or short fibers. Based on this point, people began to try the method of directional dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/20
Inventor 陈维平尚俊玲李元元李小强肖志瑜
Owner SOUTH CHINA UNIV OF TECH
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