Method for improving high-temperature stability of metal twin crystals

A high-temperature stability, metal technology, applied in metal material coating process, gaseous chemical plating, coating and other directions, can solve the problem of easy disappearance of metal twins, achieve high universality, good material properties, and expand applications range effect

Inactive Publication Date: 2020-06-09
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the metal twins are easy to disappear during the high temperature in the prior art, and to provide a method that can maintain the stability of the metal twins during the high temperature

Method used

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  • Method for improving high-temperature stability of metal twin crystals
  • Method for improving high-temperature stability of metal twin crystals
  • Method for improving high-temperature stability of metal twin crystals

Examples

Experimental program
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Embodiment 1

[0022] NPC is first placed in a methane atmosphere, then heated to melt, and finally cooled to solidify to form Cu twins bound by graphene.

[0023] (1) NPC was prepared by dealloying method.

[0024] Will Cu 17 Al 83 The alloy strips were placed in an excess of 2mol / L NaOH, and then placed in a constant temperature water bath at 25°C for 4 hours to corrode the Al component and form nanoporous copper (NPC). Pour out the NaOH solution, add ultrapure water and absolute ethanol in turn, and wash 3 times and 1 time, respectively. The obtained material is NPC, figure 1 It is a low-magnification SEM topography image of the NPC surface, and it can be seen that the prepared material is a quasi-two-dimensional sheet structure.

[0025] The NPC prepared in step (1) is placed in CH at room temperature 4 In the atmosphere for 1 hour, the surface is covered with amorphous carbon, and then the temperature is raised to 1080°C at a heating rate of 30°C / min for a heating reaction. The amo...

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Abstract

The invention discloses a method for improving high-temperature stability of metal twin crystals. The method comprises the steps that nanoporous metal is prepared firstly through a dealloying method,or an electrochemical method and a template method, then the nanoporous metal is placed in a methane atmosphere, so that the surface of the nanoporous metal is covered with a layer of amorphous carbon, and then a heating reaction is conducted. At the high temperature, the amorphous carbon is catalyzed into graphene, the part of nanoporous metal is molten and evaporated, and thus nano droplets bound by the graphene are generated. The temperature is decreased, the droplets are solidified, the twin crystals are generated in the droplets, and thus the nano metal twin crystals bound by the grapheneare formed. The nanoporous metal comprises nanoporous copper, nanoporous gold, nanoporous silver and nanoporous palladium. A preparation technology is simple, universality is high, the surfaces of the nano metal twin crystals are bound through the graphene, the high-temperature stability of the nano metal twin crystals can be greatly improved, good material performance is kept, and the application range of the metal twin crystals is expected to be expanded.

Description

technical field [0001] The invention relates to nanometer metal materials, in particular to a method for maintaining stability of metal twins during solidification and high temperature insulation. Background technique [0002] Twinning is an important deformation mode of many crystals and directly affects the mechanical and chemical properties of materials (especially metallic nanomaterials). Nano-metal twins can significantly improve the strength and hardness of metals and at the same time improve the plasticity of materials, and have excellent comprehensive properties. Therefore, nanoscale metal twinned materials have gradually become a research hotspot in the field of materials. But because smaller nanoparticles have rough and surface-melting properties at high temperatures, it is difficult for nanometal twins to remain stable at high temperatures. This has created a huge obstacle to the application of its excellent properties, so how to effectively and simply improve t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C23C16/26
CPCC22C1/08C23C16/26C22C1/082
Inventor 盖梦珂习卫罗俊
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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