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A kind of preparation method that has al-cu-fe quasi-crystal body of dodecahedral shape

A technology of dodecahedron and block, which is applied in the field of quasicrystal preparation, can solve problems such as difficulty in observing geometric growth morphology, slow growth rate, and complex growth technology of pulling method, so as to reduce the extremely fast condensation rate and improve The effect of machinability

Active Publication Date: 2017-08-04
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Quasicrystals are usually obtained by liquid rapid cooling, physical and chemical vapor deposition, ball milling, pulling, and high-pressure methods. Except for the pulling method, it is difficult to observe regular geometric growth morphology, while the pulling method grows Complex technology, extremely slow growth rate
The high-pressure method has also been used in the past to obtain quasi-crystalline phases of several systems, but it is often necessary to melt the master alloy in a high-vacuum furnace, and the high-pressure equipment used is often a less common double-sided press

Method used

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  • A kind of preparation method that has al-cu-fe quasi-crystal body of dodecahedral shape
  • A kind of preparation method that has al-cu-fe quasi-crystal body of dodecahedral shape
  • A kind of preparation method that has al-cu-fe quasi-crystal body of dodecahedral shape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In an inert gas (Ar gas) environment glove box (H2O64 Cu 25 Fe 11 Stoichiometric ratio Weigh Al powder, Cu powder and Fe powder with a purity >99.9%, put them into an agate mortar and mix well, put them into a hard alloy abrasive tool with an inner diameter of Φ9.5mm, and place them on a hydraulic tablet press After pressurizing to 3 MPa and keeping the pressure for 2 minutes, a high-pressure preform with a thickness of 10 mm was obtained.

[0022] The above-mentioned high-pressure preform is put into a high-pressure synthesis mold, and then high-pressure preparation is carried out in a hinged six-sided top press. First, raise the pressure to 3GPa, control the heating rate to 50K / min, heat to 1373K, keep the temperature and hold the pressure for 30 minutes. Subsequently, the cooling rate was controlled at 100K / min, the temperature was lowered to 1073K, and the heat preservation and pressure were maintained for 1 hour to obtain a prefabricated block.

[0023] After cr...

Embodiment 2

[0027] In an inert gas (Ar gas) environment glove box (H2O62 Cu 26 Fe 12 Stoichiometric ratio Weigh the Al powder, Cu powder and Fe powder with a purity >99.9%, put them into an agate mortar and mix them well, and press them on a hydraulic tablet press with a hard alloy abrasive tool with an inner diameter of Φ9.5mm to A high-pressure preform with a thickness of 10 mm was obtained after holding the pressure at 4 MPa for 1 minute.

[0028] The above-mentioned high-pressure preform is put into a high-pressure mold, and then high-pressure preparation is carried out in a hinged six-sided top press. First, raise the pressure to 4GPa, control the heating rate to 60K / min, heat to 1273K, keep the temperature and hold the pressure for 30 minutes. Then control the cooling rate to 100K / min, lower the temperature to 973K, hold the temperature and pressure for 3 hours, and obtain the prefabricated block.

[0029] The above-mentioned prefabricated blocks were crushed and ground into powd...

Embodiment 3

[0033] In a vacuum environment glove box, press Al 63 Cu 26 Fe 11 Stoichiometric ratio Weigh the Al powder, Cu powder and Fe powder with a purity >99.9%, put them into an agate mortar and mix them well, and press them on a hydraulic tablet press with a hard alloy abrasive tool with an inner diameter of Φ9.5mm to After holding the pressure at 2 MPa for 3 minutes, a high-pressure preform with a thickness of 10 mm was obtained.

[0034] The above-mentioned high-pressure preform is put into a high-pressure mold, and then high-pressure preparation is carried out in a hinged six-sided top press. First, raise the pressure to 6GPa, control the heating rate to 40K / min, heat to 1300K, and hold the temperature and pressure for 30 minutes. Then control the cooling rate to 100K / min, lower the temperature to 1000K, keep the temperature and pressure for 2 hours, and obtain the prefabricated block.

[0035] After crushing and grinding the above prefabricated block into a powder with unifo...

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Abstract

The invention discloses a manufacturing method for a quasi-crystal block with a dodecahedron appearance. A discharge plasma sintered prefabricated blank is mainly manufactured through Al powder, Cu powder and Fe powder under high pressure according to the atom stoichiometric ratio of 62-64% of Al, 25-26% of Cu and 11-13% of Fe; and the sintered prefabricated blank is arranged into a sintering die, the sintered prefabricated blank and the sintering die are put into a discharge plasma sintering machine cavity, inert gas is charged after vacuum pumping, or the sintering pressure is directly set to range from 50 MPa to 90 MPa under the vacuum environment, the sintering temperature is controlled at the melting point of 0.5-0.8 T, sintering is stopped after 5-30 minutes, after sintering is completed and the temperature is reduced to be lower than 100 DEG C, the shield gas is extracted, air is charged, the cavity is opened, and the Al-Cu-Fe quasi-crystal block is obtained. The manufacturing method is low in energy consumption, an obtained quasi-crystal material tends to be more densely piled, the machining performance of the quasi-crystal material is improved, meanwhile, the extremely-high condensing speed needed in completing a reaction is reduced, and quasi-crystal block material can be obtained more effectively and more stably.

Description

technical field [0001] The invention relates to a preparation method of a quasicrystal. Background technique [0002] AlCuFe stable quasicrystal Since the first discovery by Tsai et al. in 1987, scientists from various countries have conducted extensive research on this solid-state ordered phase with long-range quasi-periodic translational order and amorphous rotational symmetry from the perspectives of basic science and applied science. . Quasicrystals are usually obtained by liquid rapid cooling, physical and chemical vapor deposition, ball milling, pulling, and high-pressure methods. Except for the pulling method, it is difficult to observe regular geometric growth morphology, while the pulling method grows The technology is complicated and the growth rate is extremely slow. The high-pressure method has also been used in the past to obtain quasi-crystalline phases of several systems, but it is often necessary to melt the master alloy in a high-vacuum furnace, and the hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/02C22C30/00C22C1/04
CPCC22C1/0425C22C30/00C22C30/02C22C2200/06
Inventor 范长增康宇龙徐波
Owner YANSHAN UNIV