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A Rapid Prototyping Method for Biomimetic Shell Structure Titanium Matrix Composites

A technology of titanium-based composite materials and shells, which is applied in the direction of additive processing, process efficiency improvement, additive manufacturing, etc., to achieve the effects of tight interlayer bonding, breakthrough of weak interlayer bonding, and short process flow

Active Publication Date: 2019-12-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it should be pointed out that the shell-like structure composed of a mixture of network structure and layered structure requires tight interlayer bonding, and the hot pressing sintering method and diffusion bonding method have technological limitations to a certain extent.

Method used

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  • A Rapid Prototyping Method for Biomimetic Shell Structure Titanium Matrix Composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Using pure titanium wire and boronized pure titanium wire (0.5wt.% boron content) as raw materials, respectively put the titanium wire and boronized titanium wire into the wire feeding mechanism of the electron beam fuse forming equipment. Then adjust the wire feeding mechanism to ensure that the titanium wire intersects with the boronized titanium wire; then deflect the electron beam so that the beam spot of the electron beam coincides with the intersection point of the wire material to ensure that the wire material is accurately fed into the molten pool. Finally, through computer programming, boronized titanium wires and titanium wires are alternately deposited according to a predetermined path until the bionic shell structure titanium-based composite material is deposited. The specific process parameters of pure titanium wire electron beam fuse deposition process are: fuse current 12mA, voltage 60kV, travel speed 200mm / min, wire feeding speed 2r / min, vacuum degree bet...

Embodiment 2

[0020] The difference between this embodiment and Embodiment 1 is that the wire material is TC4 titanium wire and boronized titanium alloy wire (0.5 wt.% boron content). The specific process parameters of TC4 titanium wire electron beam fuse deposition process are: fuse current 13mA, voltage 60kV, travel speed 200mm / min, wire feeding speed 2r / min, vacuum degree better than 5×10 -2 Pa. The specific process parameters of the boronizing titanium alloy wire electron beam fuse deposition process are: fuse current 16mA, voltage 60kV, travel speed 200mm / min, wire feeding speed 2r / min, vacuum degree better than 5×10 -2 Pa. The tensile strength of the biomimetic shell structure titanium-based composite material with each layer thickness of 0.5mm is 933MPa, and the elongation is 11.3%.

Embodiment 3

[0022] The difference between this embodiment and Embodiment 1 is that the wire material is TC4 titanium wire and boronized titanium alloy wire (0.8 wt.% boron content). The specific process parameters of TC4 titanium wire electron beam fuse deposition process are: fuse current 14mA, voltage 60kV, travel speed 200mm / min, wire feeding speed 2r / min, vacuum degree better than 5×10 -2 Pa. The specific process parameters of boronizing titanium alloy wire electron beam fuse deposition process are: fuse current 18mA, voltage 60kV, travel speed 200mm / min, wire feeding speed 2r / min, vacuum degree better than 5×10 -2 Pa. The tensile strength of the biomimetic shell structure titanium-based composite material with a thickness of 0.5 mm is 941 MPa, and the elongation is 10.1%.

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Abstract

The invention relates to a rapid prototyping method of a bionic shell structure titanium-based composite material, which mainly uses titanium wire and boronized titanium wire as raw materials, and uses a double wire feeding mechanism to deposit boronized titanium wire and titanium wire through electron beam fuse deposition technology Alternate deposition. The invention provides a rapid prototyping method of a titanium-based composite material with a bionic shell structure, which can obtain a titanium-based composite material with a shell-like structure composed of a mixture of a network structure and a layered structure, and has high strength and toughness. Moreover, the process has strong applicability and short process flow, which greatly broadens the preparation and application range of titanium-based composite materials.

Description

technical field [0001] The invention relates to the field of metal-based composite materials, in particular to a rapid prototyping method for bionic shell structure titanium-based composite materials. Background technique [0002] Titanium matrix composites (TMCs) not only have high specific strength, low density and other characteristics, but also have higher elastic modulus, stiffness and excellent wear resistance and high temperature creep resistance due to the addition of reinforcing phases. Become a key candidate material for a new generation of advanced aerospace equipment. However, the enhancement of high brittleness also causes serious deterioration of material toughness, and even exhibits great room temperature brittleness, which cannot meet the requirements of harsh service environments and has become a bottleneck restricting its development. Studies have shown that shells not only have extremely high strength but also have good toughness, which is mainly related ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B33Y10/00B33Y70/00
CPCB33Y10/00B33Y70/00B22F10/00B22F10/25B22F10/36Y02P10/25
Inventor 姚正军陶学伟张莎莎刘莹莹王晗
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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