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Powder extrusion forming method for preparing porous amorphous alloy block material

An amorphous alloy and amorphous powder technology is applied in the field of powder extrusion for preparing porous amorphous alloy bulk materials, which can solve the problems of destroying the bonding strength of powder particle interface, difficulty in removal, occupying material volume and weight, etc. , to achieve the effect of good designability, simple and easy method, and uniform pore size distribution

Active Publication Date: 2010-11-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 extrusion forming method for preparing porous amorphous alloy block material
  • Powder extrusion forming method for preparing porous amorphous alloy block material
  • Powder extrusion forming method for preparing porous amorphous alloy block material

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1: Preparation of a Zr with a pore size of less than 65 μm and a porosity of 30% to 40% 50 Cu 40 al 10 Bulk Porous Amorphous Alloy Materials

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

Embodiment 2

[0037] Implementation Example 2: Preparation of a Zr with a pore size of less than 38 μm and a porosity of 40% to 50% 50 Cu 40 al 10 Bulk Porous Amorphous Alloy Materials

[0038] Argon atomized Zr 50 Cu 40 al 10 Powder, after sieving to obtain Zr with a particle size of less than 38 μm 50 Cu 40 al 10 Amorphous powder, Zr measured by DSC 50 Cu 40 al 10 Tg=438° C. and crystallization temperature Tx=497° C. of the amorphous powder (inert atmosphere, heating rate 20 k / min). Select NaCl powder with a particle size of less than 38 μm (the powder is classified by sieving or other methods) as a pore-forming agent, heat in a drying oven at 100°C to 200°C for 5h to 10h, ventilate, dry and dehydrate. Calculate the weight according to the volume ratio of 6:4, weigh the powder, and mix in a V-type mixer for 90 minutes. Then prepare according to the method and step of example 1 and obtain porosity and be 40%~50% Zr 50 Cu 40 al 10 For porous materials with open pores, the ext...

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Abstract

The invention discloses a powder extrusion forming method for preparing a porous amorphous alloy block material, which comprises: sieving amorphous powder and powder NaCl pore-forming agent respectively, weighing the amorphous powder and powder NaCl pore-forming agent according to porosity requirements, mixing the powder uniformly in a mixer, and sheathing the mixed powder, exhausting air and sealing the sheath; and heating the powder packaged by the sheath in a cold liquid phase area (Tg-Tx), keeping the temperature for 5 to 15 minutes, performing extrusion forming according to a design extrusion ratio, removing the sheath by machining, and removing the pore-forming agent by using a water solution process to obtain the blocky porous amorphous alloy material. The method is simple and easy to implement. The prepared porous amorphous alloy material has the characteristics of controllable porosity, open structure, uniform aperture distribution and the like. Meanwhile, the structural state of the powder can be retained, the dissolution of the pore-forming agent is environmentally-friendly, and the pore-forming can be recycled after processing.

Description

technical field [0001] The invention relates to a powder extrusion molding method for preparing a porous amorphous alloy block material, which can prepare a porous amorphous alloy material with an open-pore structure block with controllable pore size and porosity and uniform pore diameter distribution. Background technique [0002] Due to the fact that the atomic arrangement does not have long-range atomic order, amorphous alloys have the dual characteristics of general metals and glasses, and have excellent physical, chemical and mechanical properties, and have 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 has both the high strength of metal porous materials and the high corrosion resistance of ceramic materials. It is an ideal filter Materials for chemical separation, catalysis and energy have important application...

Claims

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Application Information

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Patent Type & Authority Applications(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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