A fiber-reinforced metal-matrix composite plate and its pretreatment method

Abstract

The invention discloses a fiber reinforced metallic matrix composite board and a pretreatment method thereof. The composite board is of a multi-layer composite structure, wherein the multi-layer composite structure is obtained by alternatively stacking reinforcing fibers and metallic matrix materials, the reinforcing fibers are carbon fiber cloths or glass fiber cloths with micro mesh woven structures, and the metallic matrix materials are lightweight metal materials with the thickness of 1-3 mm. A femtosecond / picosecond laser welding mode including one of an equal-space spot welding mode, a linear track welding mode and a circular track welding mode or a spiral track welding mode is adopted. According to process parameters, the laser spot beam diameter is 2-100 microns, the laser power is0.1-4 kW, the welding speed is 10-80 mm / min, and the welding current is 50-200 A. By means of the narrow laser spot, nonlinear high absorption rate and high penetration performance of a femtosecond / picosecond laser, bimetallic sheets isolated by the fibers are metallurgically combined through welding at fiber micropores to manufacture the high-strength fiber reinforced metallic matrix composite board.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a fiber-reinforced metal matrix composite plate and a pretreatment method thereof. Background technique [0002] The ever-increasing level of engineering technology has higher and higher requirements for material performance. In order to improve the strength and plasticity of materials, from traditional steel composite materials to aluminum-magnesium light metal composite panels, and then to fiber-reinforced metal matrix composite panels. High-strength, high-plasticity and low-weight composite materials for engineering applications, especially in the automotive and aerospace fields. [0003] However, the preparation technology of fiber-reinforced metal matrix composite panels is still immature. The main reason is that the melting point is high. Various composite processes need to be heated to a higher temperature for material softening and diffusion,...

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Problems solved by technology

[0003] However, the preparation technology of fiber-reinforced metal matrix composite panels is still immature. The main reason is that the melting point is high. Various composite processes need to be heated to a higher temperature for material softening and diffusion, and at the same time require a large external load to make the interface firmly bonded. , and the current fiber materials are mainly carbon fiber and glass fiber. Although carbon fiber has high strength, it is not resistant to high temperature and is easy to oxidize at high temperature. Glass fiber is also brittle when it bears a large radial force, which limits Composite between fiber and metal matrix

In order to overcome the above difficulties, the carbon fiber coating is generally placed in a vacuum for hot pressing or hot rolling to prepare fiber reinforced metal matrix composite panels, but this increases the preparation cost and process cycle, and the resulting cumbersome procedures also increase the performance of composite panels in the industry. uncertainty in production

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