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Preparation method for Al6Mn quasicrystal

A quasicrystal and al-mn technology, applied in the field of quasicrystal preparation, can solve the problems of easy generation of pores, non-dense samples, uneven stress, etc., and achieve the effects of excellent quality performance, high efficiency and simple process.

Active Publication Date: 2016-05-11
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the latter two methods, the first few traditional methods for preparing Al-Mn system quasicrystals are time-consuming, and the synthesized samples are not dense and prone to defects such as pores.
Although the rapid high-pressure method and the low-pressure solidification method can overcome the above-mentioned shortcomings, according to reports, the pressurization is only axial pressurization
Therefore, the sample is not uniformly stressed in all directions

Method used

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  • Preparation method for Al6Mn quasicrystal
  • Preparation method for Al6Mn quasicrystal
  • Preparation method for Al6Mn quasicrystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 1.1946g of high-purity Al powder and 0.4052g of high-purity Mn powder, place the pure Al powder and Mn powder in a mortar, grind and mix them evenly, and place them in a cemented carbide mold with an inner diameter of Φ10.6mm , pressurize at 2MPa for 100s in a hydraulic tablet press, and prepare a preparatory block with a diameter of Φ10.6mm and a thickness of 7.6mm.

[0020] The graphite furnace is a tubular furnace body with a height of 16.6mm, an outer diameter of Φ14mm, and an inner diameter of Φ12.1mm. Both ends are sealed with Φ12.06mm thick 3.3mm pyrophyllite sheets. A boron nitride crucible is set in the graphite furnace, and the crucible is 10mm in height, and the outer diameter is Φ12mm, and the inner diameter is Φ10.8mm. The two ends are sealed with boron nitride sheets with a diameter of Φ10.75mm and a thickness of 1.2mm. At the same time, the specifications of graphite sheets used for wrapping at both ends of the graphite furnace and conducting electri...

Embodiment 2

[0026] Weigh 1.3141g of high-purity Al powder and 0.4457g of high-purity Mn powder, place the pure Al powder and Mn powder in a mortar, grind and mix them evenly, and place them in a cemented carbide mold with an inner diameter of Φ10.6mm , pressurize for 200s under 4MPa in a hydraulic tablet press, and prepare a preparatory block with a diameter of Φ10.6mm and a thickness of 8.2mm.

[0027] The graphite furnace is a tubular furnace body with a height of 16.6mm, an outer diameter of Φ14mm, and an inner diameter of Φ12.1mm. Both ends are sealed with Φ12.06mm thick 3.3mm pyrophyllite sheets. A boron nitride crucible is set in the graphite furnace, and the crucible is 10mm in height, and the outer diameter is Φ12mm, and the inner diameter is Φ10.8mm. The two ends are sealed with boron nitride sheets with a diameter of Φ10.75mm and a thickness of 1.2mm. At the same time, the specifications of graphite sheets used for wrapping at both ends of the graphite furnace and conducting elec...

Embodiment 3

[0031] Weigh 1.0751g of high-purity Al powder and 0.3647g of high-purity Mn powder, place the pure Al powder and Mn powder in a mortar, grind and mix them evenly, and place them in a cemented carbide mold with an inner diameter of Φ10.6mm , pressurize for 180s under 3MPa in a hydraulic tablet press, and prepare a preparatory block with a diameter of Φ10.6mm and a thickness of 6.8mm.

[0032] The graphite furnace is a tubular furnace body with a height of 16.6mm, an outer diameter of Φ14mm, and an inner diameter of Φ12.1mm. Both ends are sealed with Φ12.06mm thick 3.3mm pyrophyllite sheets. A boron nitride crucible is set in the graphite furnace, and the crucible is 10mm in height, and the outer diameter is Φ12mm, and the inner diameter is Φ10.8mm. The two ends are sealed with boron nitride sheets with a diameter of Φ10.75mm and a thickness of 1.2mm. At the same time, the specifications of graphite sheets used for wrapping at both ends of the graphite furnace and conducting elec...

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Abstract

The invention relates to a preparation method for a Al6Mn quasicrystal. The method mainly includes the steps that pure Al powder and pure Mn powder are evenly mixed according to the atomic ratio of 6:1, arranged into a hard alloy mould, and pressed in a hydraulic tablet press to obtain a reserved block; the reserved block is mounted into a boron nitride crucible, a pre-dried tubular graphite oven body, the boron nitride crucible, a boron nitride piece, a pyrophyllite piece and a graphite piece are assembled and placed in an ultrahigh-pressure environment, the setting pressure is controlled to be the isostatic pressure ranging from 3 GPa to 5 GPa, and the temperature is controlled to rise to 700-850 DEG C and kept for 30-60 minutes; and the temperature is decreased to 480-580 DEG C and kept for 1-3 hours. The preparation method is simple in process, low in energy consumption and high in efficiency, and the content of prepared quasicrystal is high.

Description

technical field [0001] The invention belongs to the technical field of metal materials, in particular to a method for preparing quasicrystals. Background technique [0002] In 1984, Israeli scientist D. Shechtman first discovered icosahedral quasicrystals in Al-Mn alloys rapidly cooled by throwing belts. This is a new crystallographic structure: long-range orientation order but no translational periodic order (Phys.Rev . Lett. (Physical Review Letters) 53(1984)1951). So far, quasicrystals have been found in hundreds of alloy systems, including icosahedral quasicrystals, and quasicrystals with 8, 10, 12 and 18 rotational symmetry. This non-crystallographic symmetry element is incompatible with the translational periodicity of the Bravais lattice required by classical crystallographic theory, thus motivating numerous theoretical and experimental studies. The study found that the special structure of quasicrystals has some excellent properties, such as high hardness, high cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C45/08C22C21/00
CPCC22C1/0416C22C21/00C22C45/08C22C1/11
Inventor 范长增何璞
Owner YANSHAN UNIV
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