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Die and method for preparing large-size three-dimensional full-density nanocrystalline iron body material

A large-size, nano-crystalline technology, applied in the field of nano-crystalline bulk material preparation, can solve the difficulties in the preparation of three-dimensional large-scale fully dense bulk nano-metal materials, and it is difficult to prepare three-dimensional large-size bulk nano-metal materials with fine grains. To solve the problems of limited chemical capacity and achieve the effects of low cost, long service life and simple process

Active Publication Date: 2015-06-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ultra-fine grain bulk material prepared by this method does not have problems such as microporosity and oxidation pollution, but the preparation equipment requires high requirements, the grain refinement ability is limited, and the production efficiency is low.
[0004] So far, many research institutions and universities at home and abroad have carried out the preparation and performance research of bulk nano-metal materials. The research has made great progress, but they have encountered great difficulties in the preparation of three-dimensional large-scale fully dense bulk nano-metal materials. , it is also difficult to prepare three-dimensional large-scale bulk nano-metal materials that can be sampled according to relevant standards and processed into standard samples for tensile tests.

Method used

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  • Die and method for preparing large-size three-dimensional full-density nanocrystalline iron body material
  • Die and method for preparing large-size three-dimensional full-density nanocrystalline iron body material
  • Die and method for preparing large-size three-dimensional full-density nanocrystalline iron body material

Examples

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Effect test

Embodiment 1

[0047] In this embodiment, the three-dimensional large-size full-dense nanocrystalline iron block material is prepared by using the above-mentioned mold, including the following steps:

[0048] (1) Process industrial pure iron into 219×59×59mm 3 cuboid; the original grain size is 35 μm.

[0049] (2) Assemble the mold, leave the upper plate unassembled, pad a single layer of 506 mica paper on the inner sides of the bottom plate, front plate, rear plate, left side plate, and right side plate and place it horizontally on the impact table with the opening facing Above; the assembly method of the mold is as follows:

[0050] (2.1) Place the bottom plate on a horizontal surface with the slotted side facing down;

[0051] (2.1) Put the left side board and the right side board on the bottom board respectively, put the front board and the rear board on the bottom board respectively, the first through hole 4 on the front and rear boards is opposite to the first round hole 2 on the bot...

Embodiment 2

[0067] This example is the same as Example 1, wherein the primary grain size of industrial pure iron is 35 μm, the annealing temperature of the fifth, ninth and thirteenth steps is 385° C., and the holding time is 1 h. The grain size of the final three-dimensional large-sized fully dense cuboid nanocrystalline pure iron bulk material is 87nm.

Embodiment 3

[0069] This example is the same as Example 1, wherein the primary grain size of industrial pure iron is 35 μm, the annealing temperature of the fifth, ninth and thirteenth steps is 390° C., and the holding time is 1 h. The grain size of the final three-dimensional large-sized fully dense cuboid nanocrystalline pure iron bulk material is 95nm.

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Abstract

The invention discloses a die and a method for preparing a large-size three-dimensional full-density nanocrystalline iron body material. According to the method, common industrial pure iron is taken as a raw material, large-load impact and annealing treatment are performed at a liquid-nitrogen temperature in three directions through the special die, and then the large-size three-dimensional full-density nanocrystalline iron body material is obtained. The method does not require special production equipment and is simple in process, convenient to operate, efficient in preparation and good in economical performance. The die adopts a combination type detachable independent element structure and is convenient to use, high in reliability, low in cost and long in service life.

Description

technical field [0001] The invention relates to the technical field of preparation of nanocrystalline bulk materials, in particular to a mold and method for preparing a three-dimensional large-size full-dense nanocrystalline iron bulk material. Background technique [0002] Bulk nanometal materials, as an important nanomaterial, have attractive application prospects and are one of the hotspots in nanomaterials research. The research focuses on the preparation, microstructure and intrinsic properties of bulk nanometal materials. The preparation of fully dense bulk nano-metal materials without fabricated micro-defects, especially the preparation of three-dimensional large-scale fully-dense bulk nano-metal materials without prepared micro-defects is the basis for studying the intrinsic properties of bulk nano-metal materials, and it is also the basis for their realization. One of the keys to engineering applications. [0003] The preparation methods of bulk nano-metal material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J13/02B21J5/00
CPCB21J5/00B21J13/02
Inventor 罗伟严密王琪明吴琛马天宇姜银珠
Owner ZHEJIANG UNIV