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Powder forging and molding method for preparing porous amorphous alloy block material

A technology of amorphous alloy and amorphous powder, which is applied in the field of powder forging and pressing for the preparation of porous amorphous alloy bulk materials. Achieve good designability, uniform pore size distribution, and simple dissolution

Active Publication Date: 2011-04-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2007, Yoshikawa et al. attempted to prepare Ni by microwave sintering. 52.5 Zr 15 Nb 10 Ti 15 Pt 7.5 Porous materials, but the high bond strength of the prepared amorphous porous materials needs to be improved ]
Hollow spheres as occupants generally remain in the material, are difficult to remove, occupy the volume and weight of the material, and affect its performance and application
[0009] (3) The melt infiltration casting process is complicated, and the sintered porous formwork will restrict the porosity, pore size and shape of the prepared bulk porous amorphous material, affecting the formation of amorphous
[0011] (5) Limited by the ability of the alloy system to form amorphous, the size of the bulk porous amorphous alloy material prepared by the foaming method and the melt infiltration casting method is limited, which limits its industrial application
[0012] (6) The porous material is prepared by powder hot isostatic pressing + foaming method, because the foaming process will destroy the bonding strength of the powder particle interface, thus reducing the mechanical properties of the bulk porous material
[0013] (7) Porous materials prepared by EDM plasma sintering and microwave sintering methods cannot control the porosity and pore size, and it is difficult to obtain porous materials with large porosity

Method used

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  • Powder forging and molding method for preparing porous amorphous alloy block material
  • Powder forging and molding method for preparing porous amorphous alloy block material
  • Powder forging and molding method for preparing porous amorphous alloy block material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Preparation of a Zr with a pore size of less than 65μm and a porosity of 30%-40% 50 Cu 40 Al 10 Bulk porous amorphous alloy material

[0036] Atomize argon into Zr 50 Cu 40 Al 10 Powder, Zr with a particle size of 74μm~38μm after sieving 50 Cu 40 Al 10 Amorphous powder, Zr measured by DSC 50 Cu 40 Al 10 Amorphous powder Tg=438°C and crystallization temperature Tx=497°C (inert atmosphere, heating rate 20k / min, see figure 1 ). Select NaCl powder with a particle size of less than 65μm (the powder is classified by sieving or other methods) as the pore-forming agent, and heat it with a drying oven at 100℃~200℃ for 5h~10h, ventilate and dry. Zr with a particle size of 74μm~38μm 50 Cu 40 Al 10 Amorphous powder and NaCl powder less than 65μm, calculate the volume and mass according to the volume ratio of 7:3, weigh the powder according to the mass, and mix it with a V-type mixer for 90 minutes. Put the uniformly mixed amorphous and pore-forming agent mixed powder into t...

Embodiment 2

[0037] Implementation Example 2: Preparation of a Zr with a pore size of less than 38μm and a porosity of 40%-50% 50 Cu 40 Al 10 Bulk porous amorphous alloy material

[0038] Atomize argon into Zr 50 Cu 40 Al 10 Powder, after sieving to obtain Zr with particle size less than 38μm 50 Cu 40 Al 10 Amorphous powder, Zr measured by DSC 50 Cu 40 Al 10 The amorphous powder has Tg=438°C and crystallization temperature Tx=497°C (inert atmosphere is used, and the heating rate is 20k / min). Select NaCl powder with a particle size of less than 38μm (the powder is classified by sieving or other methods) as the pore-forming agent, and heat it with a drying oven at 100℃~200℃ for 5h~10h, ventilate and dry it for dehydration. Calculate the weight according to the volume ratio of 6:4, weigh the powder, and mix for 90 minutes in the V-type mixer. Then follow the method and steps of Example 1 to obtain Zr with a porosity of 40% to 50% 50 Cu 40 Al 10 Open-pore porous material.

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Abstract

The invention discloses a powder forging and molding method for preparing a porous amorphous alloy block material. The method comprises the following steps of: after respectively sieving amorphous powder and a powdered NaCl pore-forming agent, proportionally weighing the two components according to a porosity requirement; after uniformly mixing the components by a material mixer, carrying out sheathing, degassing and enveloping; carrying out heating and heat preservation on the sheathed and enveloped powder in a cold liquid phase area (Tg-Tx) for 5-15 minutes; forging and molding according toa set forging ratio, maintaining pressure for 30-90s and then forging; removing sheaths by adopting a machining method; and removing the pore forming agent by a water dissolving method to obtain the porous amorphous alloy block material. The method is simple and easy to apply, the prepared porous amorphous alloy material has the characteristics of controlled porosity, opening structure, uniform pore size distribution, and the like; meanwhile, the structural behavior of the powder can also be maintained. The dissolution of the pore forming agent is environmentally friendly, and the pore forming agent can be repeatedly used after treated.

Description

Technical field [0001] The invention relates to a powder forging forming method for preparing a porous amorphous alloy bulk material. The method can prepare an open-pore structure bulk porous amorphous alloy material with controllable pore size, porosity and uniform pore size distribution. Background technique [0002] Amorphous alloys do not have long-range atomic order due to their atomic arrangement, which allows them to have the dual characteristics of general metals and glass, and has excellent physical, chemical and mechanical properties, and has received extensive attention in recent years. As a new type of porous material, porous amorphous alloy material has excellent mechanical properties, corrosion resistance and energy absorption properties. It not only has the high strength of metal porous materials, but also has the high corrosion resistance of ceramic materials. It is an ideal filter With materials for chemical separation, catalysis and energy, it has important appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08C22C45/00
Inventor 刘祖铭刘咏黄伯云朱艺添吴宏张刘杰孙沛
Owner CENT SOUTH UNIV
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