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Preparation method of Al-Co-Ni quasicrystal

An al-co-ni, quasicrystal technology, applied in the field of quasicrystal preparation, can solve the problems of long, often ten or tens of hours, harsh experimental conditions, complicated process, etc., and achieves good mechanical properties and excellent quality performance. , the effect of simple process

Active Publication Date: 2016-05-25
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the first two methods can prepare large-scale quasi-crystalline single crystal particles, the preparation cycle is relatively long, often tens or tens of hours
The melt quenching method is a common preparation method, but the experimental conditions are harsh, often requiring ultra-high vacuum and inert gas protection
As a parameter paralleled with temperature and composition, high pressure has also been used to prepare Al-Ni-Co system quasicrystals in the past, but the relatively rare double-sided top press is used and the master alloy is melted in a vacuum furnace. , complex process

Method used

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  • Preparation method of Al-Co-Ni quasicrystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Preparation of the mold: 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. The diameter is Φ12mm and the inner diameter is Φ10.8mm. Both ends are sealed with boron nitride sheets with a diameter of Φ10.75mm and a thickness of 1.2mm. After the above materials are prepared, put them together with the pyrophyllite cubes and steel caps used by the six-sided top press in a drying oven at a temperature of 180°C for 3 hours for later use.

[0019] (2) Take 1.10538g of Al powder, 0.30179g of Co powder, and 0.63449g of Ni powder with a purity>99.9%, (according to Al 72 co 9 Ni 19 Weigh) and mix evenly, put it into a Φ10.6 cemented carbide mold, pressurize to 3.5MPa in a hydraulic tablet press, hold the pressure for 120s, and prepare a preparatory block with a diameter of Φ10.6mm and a thickness of 7.6mm.

[0020] (3) After the boron nitride crucible and the graphite furnace prepared by ste...

Embodiment 2

[0023] (1) Preparation of the mold: 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. The diameter is Φ12mm and the inner diameter is Φ10.8mm. Both ends are sealed with boron nitride sheets with a diameter of Φ10.75mm and a thickness of 1.2mm. After the above materials are prepared, put them together with the pyrophyllite cubes and steel caps used by the six-sided top press in a drying oven at a temperature of 180°C for 3 hours for later use.

[0024] (2) Take 1.0464g of Al powder, 0.3541g of Co powder, and 0.6412g of Ni powder with a purity>99.9%, (according to Al 71 co 11 Ni 20 Weigh) and mix evenly, put it into a Φ10.6 cemented carbide mold, pressurize to 2MPa in a hydraulic tablet press, hold the pressure for 300s, and obtain a preparatory block with a diameter of Φ10.6mm and a thickness of 7.6mm.

[0025] (3) After the boron nitride and graphite tube heating furnaces of the boron nitrid...

Embodiment 3

[0028] (1) Preparation of the mold: 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. The diameter is Φ12mm and the inner diameter is Φ10.8mm. Both ends are sealed with boron nitride sheets with a diameter of Φ10.75mm and a thickness of 1.2mm. After the above materials are prepared, put them together with the pyrophyllite cubes and steel caps used by the six-sided top press in a drying oven at a temperature of 180°C for 3 hours for later use.

[0029] (2) Take 1.1308g of Al powder, 0.2707g of Co powder, and 0.6402g of Ni powder with a purity>99.9%, (according to Al 73 co 8 Ni 19 Weigh) and mix evenly, put it into a Φ10.6 cemented carbide mold, pressurize to 2MPa in a hydraulic tablet press, hold the pressure for 100s, and prepare a preparatory block with a diameter of Φ10.6mm and a thickness of 7.6mm.

[0030] (3) After the boron nitride and graphite tube heating furnaces of the boron nitrid...

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Abstract

The invention discloses a preparation method of an Al-Co-Ni quasicrystal. The chemical component of the Al-Co-Ni quasicrystal comprises 70-74% of Al, 8-11% of Co and 18-21% of Ni. The preparation method mainly comprises the steps that Al powder, Co powder and Ni powder are evenly mixed and placed into a hard alloy die, pressure in a hydraulic tablet machine is 2-4 MPa and maintained for 100-300 s, and a preliminary block is obtained; the prepared preliminary block is placed into a boron nitride and graphite pipe heating furnace, then a pyrophyllite block is added, the product is placed in an isostatic pressing six-surface diamond presser, isostatic pressing is carried out under 3-5 Gpa, the current is switched on for heating and start, the temperature is kept for 30 min after being increased to 1050-1150 DEG C, the temperature is kept for 1-3 h after being decreased to 850-950 DEG C, and the Al72Co9Ni19 quasicrystal is obtained. The preparation method is simple in technology and convenient to operate, the quasicrystal is prepared in one step, and the obtained quasicrystal has the good mechanical property and good quality performance.

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 October 1984, D. Shechtman et al. first discovered an alloy phase with icosahedral point group symmetry including the five-fold rotational symmetry axis in the quenched and rapidly solidified Al-Mn alloy, and called it icosahedral. surface phase. This alloy phase shows sharp Bragg diffraction peaks in both X-ray diffraction and electron diffraction, but it cannot be calibrated by any Bravais lattice. The electron diffraction pattern of this new phase clearly shows the five-fold rotational symmetry that is not allowed by the crystal structure, and it is a solid-state ordered phase with long-range quasi-periodic translational order and non-crystallographic rotational symmetry, Levine and Steinhardt Materials with such characteristics are called quasi-periodic crystals, or quasicrystals for short. Sinc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C21/00
CPCC22C1/0416C22C21/00C22C2200/06
Inventor 范长增司伟静
Owner YANSHAN UNIV
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