Preparation method for Ti-Al system gradient protective screen material

Abstract

The invention discloses a preparation method for a Ti-Al system gradient protective screen material, and the preparation method improves sample connecting performance through a method of improving anatom contact area at a diffusion welding physical contact stage. The preparation method specifically comprises the following steps of: (1) selecting and designing a gradient protective screen body system; (2) performing orientated grinding treatment on the surface of a to-be-connected Ti / Al system sample; (3) performing oriented assembly on the Ti / Al system to-be-welded sample; and (4) performinglow-temperature connection on the Ti / Al system sample. The preparation method can realize low-temperature high-strength connection between the titanium alloy and the aluminum alloy; the prepared Ti-Algradient material is good in welding joint combination, is simple and convenient to operate and is small in control difficulty in comparison with a conventional welding joint, is low in preparation temperature, is low in cost, is free of an intermetallic compound, is small in joint residual stress and is extremely good in performance; and the Ti-Al system gradient protective screen material has shear strength of 128 MPa, and is used as a gradient protective screen which is novel and reasonable in structural design in comparison with a conventional protective screen, is small in density and isgood in protective effect.

Description

Technical field [0001] The invention relates to the preparation of materials, in particular to a preparation method of a Ti-Al system gradient protective screen material. Background technique [0002] The serious threat of space debris to spacecraft has attracted great attention from various countries. The use of protective structures to protect the spacecraft from damage by space debris and to increase the service life of the spacecraft is the most common method at this stage. In terms of the design of space debris protection structures and the research on the characteristics of hypervelocity impacts, the United States, Russia, and Europe started relatively early, and achieved the most results, ranking among the world's leading levels. Fred Whipple proposed a single buffer screen protection structure in the 1940s. The single-buffer screen protective structure is composed of an aluminum protective plate at the front, a rear wall at the rear, and the space between the two. The p...

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Problems solved by technology

[0008] The present invention controls the roughness value of the Ti-Al contact surface to achieve optimal contact, and then uses a low-temperature high-strength connection method to prepare a Ti-Al gradient material for space protection, which solves the problem of traditional single-screen aluminum alloys. The protection performance of the wall protection material is insufficient, and there are problems of perforation and peeling; it makes up for the ceramic / metal composite material caused by the obvious difference in density, elastic modulus and acoustic impedance when the ceramic matrix metal composite material is impacted. Reflected stretching waves are generated at the interface, resulting in low tensile strength and insufficient fracture of the ceramic panel

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