A structure-controllable 3D reinforced aluminum matrix composite material and its preparation method

Abstract

The invention provides a structure-controllable 3D reinforced aluminum-based composite material and a preparation method thereof, which belong to the technical field of precision forming of high-performance aluminum-based composite materials. In the present invention, the first liquid aluminum alloy is used to impregnate the unidirectional fiberboard along the fiber direction, and then the obtained unidirectional fiber-reinforced aluminum matrix composite material sheet is cut into unidirectional aluminum matrix composite material wire, and then the wire is used to construct 3D Reinforcement, which can be combined with the second liquid aluminum alloy to obtain a 3D reinforced aluminum matrix composite material, which can significantly reduce the liquid infiltration resistance and reduce fiber segregation, and can overcome the impact of aluminum alloy on the 3D fiber reinforcement in the traditional liquid pressure infiltration method. Difficulty in filling the middle and transverse fiber bundles and many defects in preparation. Moreover, it can accurately manufacture 3D reinforcements according to requirements, and has the advantages of low preparation cost, precise adjustment of fiber volume fraction, precise and controllable reinforcement structure, etc., and can realize the precise forming and mass industrial production of large-scale 3D reinforced aluminum matrix composites. .

Description

technical field [0001] The invention relates to the technical field of precision forming of high-performance aluminum-based composite materials, in particular to a structure-controllable 3D reinforced aluminum-based composite material and a preparation method thereof. Background technique [0002] Continuous fiber reinforced aluminum matrix composites have excellent comprehensive properties such as high specific strength and specific modulus, low thermal expansion coefficient, good heat resistance and anti-aging. As a strong competitor and Alternatives have attracted the attention of researchers at home and abroad. A large number of studies have shown that unidirectional reinforced aluminum matrix composites have extremely high strength and modulus along the fiber axis, while their mechanical properties along the fiber transverse direction are poor; 2D laminated reinforced aluminum matrix composites can be adjusted by laying angle design Its in-plane performance, but still ...

AI Technical Summary

Problems solved by technology

However, the current preparation method has the following technical difficulties: (1) The fiber bundles in the 3D fiber preform are distributed in different directions and overlap each other. When the liquid metal infiltrates and flows along the direction of the fiber bundles, the gaps in the fiber bundles are fully filled. However, it is very difficult for the liquid metal to infiltrate and flow along the vertical direction of the fiber bundles, and it is impossible to completely fill the gaps in the fiber bundles, especially at the overlap of the fiber bundles, the liquid metal cannot even penetrate and fill at all, so the prepared composite material has many defects and a dense structure. (2) It is difficult to precisely control the volume fraction of fibers in the 3D fiber preform prepared by weaving or weaving, and the pressure in the liquid pressure infiltration method is easy to cause 3D The macroscopic deformation of the fiber preform, the deviation of the internal fiber bundles in all directions, and the segregation of the fibers in the fiber bundles make it impossible to precisely control the shape of the internal fiber structure and fiber volume fraction of the 3D reinforced aluminum matrix composite

Images