Method for preparing SiC particle-reinforced aluminum matrix composite through SPS

Abstract

The invention provides a method for preparing a high-volume-fraction SiC particle-reinforced aluminum matrix composite through SPS. The method comprises the steps that 25%-55% of SiC particles and 45%-75% of aluminum powder are weighed out according to the volume fraction ratio, the SiC particles and the aluminum powder are placed in a ball milling tank, the ball material ratio ranges from 1:1 to 3:1, the ball milling rotating speed is selected to range from 200 r / min to 350 r / min, continuous ball milling is carried out for 1 h to 2 h, and mixed powder is manufactured; the mixed powder and a binding agent are mixed and stirred, and then particle manufacturing is carried out through a screen of 60 meshes to 100 meshes in a screening manner; the manufactured particles are placed in a steel mold, powder is subjected to cold pressing forming at the pressure ranging from 30 MPa to 80 MPa, and a green body is manufactured; and the green body is dried for 2 h to 4 h under the condition of the temperature ranging from 60 DEG C to 100 DEG C and placed in a graphite mold, the graphite mold is placed in a discharge plasma sintering furnace, a vacuum state is achieved after vacuumizing, or argon is input till the pressure ranges from 0.5*103 Pa to 0.9*105 Pa, then the temperature is raised to range from 500 DEG C to 650 DEG C at the temperature rise rate ranging from 30 DEG C / min to 60 DEG C / min, meanwhile, the pressure ranging from 30 MPa to 50 MPa is applied, heat preservation is carried out for 2 min to 10 min, then cooling is carried out to achieve the room temperature, and the SiC particle-reinforced aluminum matrix composite can be obtained.

Description

technical field [0001] The invention relates to a method for preparing SiC particle-reinforced aluminum-based composite materials by using SPS, and belongs to the technical field of methods for preparing aluminum-based composite materials. Background technique [0002] SiC particle reinforced aluminum matrix composites have both metal and non-metallic properties, high volume fraction silicon carbide particle reinforced aluminum matrix composites have high specific strength and high specific modulus, low density, good thermal conductivity and Excellent mechanical and physical properties such as dimensional stability have broad application prospects in aerospace, electronic packaging, optical systems, and weaponry. There are many ways to prepare SiC particle reinforced aluminum matrix composites, such as stir casting, squeeze casting, melt infiltration, powder metallurgy and spray deposition. Among them, the stirring casting method requires special treatment of SiC particles ...

AI Technical Summary

Problems solved by technology

Among them, the stirring casting method requires special treatment of SiC particles due to the interface wettability requirements between SiC particles and aluminum alloy liquid. The process is complicated and the cost is high, and the gas involved in the stirring process will form pores, affecting Material strength, and only composite materials with low volume fraction can be prepared

Squeeze casting method requires high pressure to infiltrate the aluminum liquid into the SiC prefabricated block, which will easily cause the cracking of the prefabricated block, resulting in uneven composite materials and more aluminum insertion layers.

The infiltration method also easily deforms the prefabricated block, and the microstructure of the composite material obtained is uneven, and there is segregation in the matrix alloy, and because of the high temperature, the SiC particle and the aluminum liquid cannot be well controlled. interface reaction

The usual powder metallurgy method requires a long process flow, low efficiency, poor density, and high cost; although the composite material prepared by the spray forming method has better performance, this method also has the problems of high cost and complicated equipment.

[0003] The application publication number is CN105154705A, and the application publication date is December 16, 2015. The invention patent application discloses a SPS silicon carbide particle reinforced aluminum matrix composite material and its preparation method. Compared with the previous technology, although there are great Progress, but the preparation of aluminum matrix composites with a lower volume fraction, and its fracture toughness, flexural strength, elastic modulus, etc. need to be improved

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