Preparation method for Ti-Al system gradient protective screen material

A protective screen and ti-al technology, applied in the direction of welding equipment, manufacturing tools, non-electric welding equipment, etc., can solve the problems of perforation, peeling, ceramic panel fracture, insufficient protection performance, etc., to reduce the activation energy of diffusion, promote diffusion, The effect of increasing the sample contact area

Active Publication Date: 2018-06-01
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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, an

Method used

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  • Preparation method for Ti-Al system gradient protective screen material
  • Preparation method for Ti-Al system gradient protective screen material
  • Preparation method for Ti-Al system gradient protective screen material

Examples

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Embodiment 1

[0052] The titanium alloy sheet 4 and the aluminum alloy sheet 3 are diffusely connected, wherein the titanium alloy sheet is a Ф100*0.5mmTC4 titanium alloy sheet, the aluminum alloy sheet is a Ф100*4.2mm 1060 aluminum sheet, and the density after the connection is 13.59g / ㎡. Ensure that the surface roughness of the sample before welding is: the roughness value Sa of Ti is 109.90 μm, and the roughness value Sa of Al is 101.43 μm. When the samples to be welded are placed, the scratch directions remain parallel. Diffusion bonding process conditions are: welding temperature 410℃, holding time 120min, welding pressure 20MPa. The LY12 aluminum pellet with a diameter of 9.9mm is used for the dynamic loading of the second-stage light gas gun. The initial impact velocity is 3.08km / s.

[0053] See figure 1 , The specific steps for preparing Ti-Al system gradient shield material are as follows:

[0054] 1. Directional polishing:

[0055] The base material titanium alloy sheet and aluminum all...

Embodiment 2

[0068] Diffusion join the titanium alloy sheet and the aluminum alloy sheet. The titanium alloy sheet is a Ф100*0.5mmTC4 titanium alloy sheet, and the aluminum alloy sheet is a Ф100*4.2mm 1060 aluminum sheet. The density after the connection is 13.59g / ㎡. Ensure that the surface roughness of the sample before welding is: Ti roughness value Sa is 101.90μm, Al roughness value Sa is 111.43μm, when the sample to be welded is placed, the scratch direction remains parallel. Diffusion bonding process conditions are: welding temperature 410℃, holding time 120min, welding pressure 20MPa. The LY12 aluminum pellet with a diameter of 9.9mm is used for the dynamic loading of the second-stage light gas gun. The initial impact velocity is 3.08km / s.

[0069] See figure 1 , The specific steps for preparing Ti-Al system gradient shield material are as follows:

[0070] 1. Directional polishing:

[0071] The base material titanium alloy sheet and aluminum alloy sheet are cut into the required size by ...

Embodiment 3

[0081] Diffusion join the titanium alloy sheet and the aluminum alloy sheet. The titanium alloy sheet is a Ф100*0.5mmTC4 titanium alloy sheet, and the aluminum alloy sheet is a Ф100*4.2mm 1060 aluminum sheet. The density after the connection is 13.59g / ㎡. Ensure that the surface roughness of the sample before welding is: the roughness value Sa of Ti is 69.12μm, and the roughness value Sa of Al is 67.91μm. When the samples to be welded are placed, the scratch directions remain parallel. Diffusion bonding process conditions are: welding temperature 410℃, holding time 120min, welding pressure 20MPa.

[0082] The specific steps for preparing the Ti-Al system gradient shield material are as follows:

[0083] 1. Directional polishing:

[0084] The base material used was cut into the required size by wire cutting, and ultrasonically cleaned with acetone solution for 10 minutes. Use a surface grinder to process the titanium alloy sheet and the aluminum alloy sheet into a sheet with a parall...

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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...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23K20/02B23K20/14B23K20/24
Inventor 罗国强贺家煜张建饶梅沈强张联盟
Owner WUHAN UNIV OF TECH
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