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Hot-isostatic-pressing liquid-phase sintering preparation method of beryllium-aluminum alloy

A beryllium aluminum alloy and aluminum alloy technology, applied in the field of alloy preparation, can solve the problems of poor powder particle bonding, difficulty in densification, etc., and achieve the effects of reducing oxygen content, low oxygen content, and improving alloy performance

Inactive Publication Date: 2017-11-17
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a method for effectively controlling the oxygen content in the alloy, and also provides a new alloy composition and a hot isostatic pressing liquid phase sintering method, which can solve the densification difficulty in the beryllium aluminum alloy powder metallurgy preparation process and the poor bonding between powder particles caused by the oxide film, and improve the mechanical properties of the alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of beryllium aluminum alloy hot isostatic pressing liquid phase sintering in this embodiment is carried out according to the following steps:

[0025] Using 10 μm 5083Al powder and 10 μm Be powder as raw materials, beryllium aluminum alloy with Be content of 30wt% was prepared. Raw material mixing and cold isostatic pressing were carried out in a glove box under an argon protective atmosphere.

[0026] 1. Raw material mixing: use high-energy ball mill to mix beryllium powder and aluminum alloy powder according to the designed composition ratio;

[0027] 2. Cold isostatic pressing: put the composite material powder into a soft film mold of a certain shape, and cold-press the billet with a certain density and strength by cold isostatic pressing. The cold isostatic pressing pressure is 10MPa, and the pressure is maintained. Time 30min;

[0028] 3. Hot isostatic pressing liquid phase sintering: put the cold-pressed blank into the furnace body, vacuu...

Embodiment 2

[0031] Using 10 μm 6061Al powder and 10 μm Be powder as raw materials, beryllium aluminum alloy with Be content of 50wt% was prepared. Raw material mixing and cold isostatic pressing were carried out in a glove box under an argon protective atmosphere.

[0032] 1. Raw material mixing: use high-energy ball mill to mix beryllium powder and aluminum alloy powder according to the designed composition ratio;

[0033] 2. Cold isostatic pressing: Put the composite material powder into a soft film mold of a certain shape, and cold-press the billet with a certain density and strength by cold isostatic pressing. The cold isostatic pressing pressure is 100MPa, and the pressure is kept Time 15min;

[0034] 3. Hot isostatic pressing liquid phase sintering: put the cold compact into the furnace body, vacuumize, sintering temperature 750 ℃, sintering pressure 60MPa, holding time 15min.

[0035] After the preparation is completed, the test shows that the sample has dense crystallization, hi...

Embodiment 3

[0037] Using 10 μm 4043Al powder and 10 μm Be powder as raw materials, beryllium aluminum alloy with Be content of 62wt% was prepared. Raw material mixing and cold isostatic pressing were carried out in a glove box under an argon protective atmosphere.

[0038] 1. Raw material mixing: use high-energy ball mill to mix beryllium powder and aluminum alloy powder according to the designed composition ratio;

[0039] 2. Cold isostatic pressing: Put the composite material powder into a soft film mold of a certain shape, and cold-press the billet with a certain density and strength by cold isostatic pressing. The cold isostatic pressing pressure is 250MPa, and the pressure is kept Time 5min;

[0040] 3. Hot isostatic pressing liquid phase sintering: put the cold compact into the furnace body, vacuumize, sintering temperature 650 ℃, sintering pressure 100MPa, holding time 5min.

[0041] After the preparation was completed, the test showed that the crystal of the sample was dense and...

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Abstract

The invention relates to a preparation method of beryllium aluminum alloy, which aims to reduce the difficulty of preparation and improve production efficiency. The preparation method of the beryllium aluminum alloy in the present invention comprises three key steps of raw material mixing, cold isostatic pressing and hot isostatic pressing liquid phase sintering. Compared with other preparation methods of beryllium-aluminum alloys, the method of the present invention selects aluminum alloys containing alloy elements, which improves the wettability of liquid aluminum and solid beryllium during the preparation process of beryllium-aluminum alloys by liquid phase sintering, and has the advantages of low sintering temperature and short sintering time. The advantages of short length and high interface bonding strength can greatly improve the mechanical properties of beryllium aluminum alloy.

Description

technical field [0001] The invention relates to an alloy preparation method, in particular to a preparation method of beryllium aluminum alloy. Background technique [0002] Beryllium has the characteristics of low density, high melting point, high rigidity, low thermal neutron absorption cross section, excellent thermal performance, high infrared reflectivity, and good X-ray penetration, but it is brittle and difficult to process, and it is difficult to make complex structural parts . Developing composites with plastic matrices could improve beryllium's room-temperature brittleness approach. In the 1960s, NASA devoted itself to the development of plastic beryllium-based materials, and successfully developed the Be-Al alloy series. [0003] In the beryllium-aluminum binary phase diagram, there is only one simple eutectic reaction, the eutectic temperature is 644°C, and the eutectic composition is 2.5±0.2at%Be; the solid solubility of Be in Al is 0.3at%, and Al is in Be le...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C25/00
CPCC22C1/0408C22C25/00
Inventor 刘向东张鹏程罗昊何世雄徐庆东窦作勇王海军
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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