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Method for preparing monotectic alloy powder having shell-shaped composite constitution

A technology of composite structure and alloy powder, which is applied in the field of atomization preparation of monomorphic alloy powder with shell-type composite structure, and can solve the problem that the cause of formation is not very clear.

Inactive Publication Date: 2010-04-28
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to gain an in-depth understanding of the solidification characteristics of this type of alloy, material scientists at home and abroad have done a lot of experimental research work under ground and space microgravity conditions, and carried out extensive theoretical simulations. It was found that solidification under microgravity conditions The samples often present a layered structure, the reason for which is not very clear so far

Method used

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  • Method for preparing monotectic alloy powder having shell-shaped composite constitution
  • Method for preparing monotectic alloy powder having shell-shaped composite constitution
  • Method for preparing monotectic alloy powder having shell-shaped composite constitution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] As shown in Figure 2(a), using a common gas atomization powder making device, for the Al-7wt%Pb alloy, argon is used as the atomizing gas, and the atomizing gas pressure is 40 atmospheres, and the surface-enriched Pb phase is prepared. Atomized powder with a particle size of 10-100 μm.

[0020] Its preparation process is as follows:

[0021] The monotectic alloy melt is smelted in a vacuum induction furnace, and a uniform melt is obtained after heat preservation at 1213K; the blocking rod placed and the melting crucible guide tube is pulled up, the melt flows out from the guide tube, and is atomized by the atomizing gas to become Small droplets, the atomized droplets are rapidly cooled and solidified under the action of the atomizing gas, and become powder.

Embodiment 2

[0023] As shown in Figure 2(b), using a common gas atomization powder making device, for the Al-15wt%Pb alloy, use ordinary industrial nitrogen (containing O 2 0.5-0.6Vol%) is the atomization gas, and other atomization parameters remain unchanged, and the atomized powder whose surface is enriched with Pb phase is prepared, and the particle size is 10-100 μm.

[0024] Its preparation process is as follows:

[0025] The monotectic alloy melt is smelted in a vacuum induction furnace, and a uniform melt is obtained after being kept warm at 1300K; the blocking rod placed and the melting crucible guide tube is pulled up, and the melt flows out from the guide tube and is atomized by the atomizing gas to become For small droplets, the atomizing gas pressure is 40 atmospheres; the atomized droplets are rapidly cooled and solidified under the action of the atomizing gas, and become powder.

Embodiment 3

[0027] As shown in Figure 2(c), using a common gas atomization powder making device, for the Al-30wt%Pb alloy, use ordinary industrial nitrogen (containing O 2 0.5-0.6Vol%) is the atomization gas, and other atomization parameters remain unchanged, and the atomized powder whose surface is enriched with Pb phase is prepared, and the particle size is 10-100 μm.

[0028] Its preparation process is as follows:

[0029] The monotectic alloy melt is smelted in a vacuum induction furnace, and a uniform melt is obtained after heat preservation at 1673K; the blocking rod placed and the melting crucible guide tube is pulled up, the melt flows out from the guide tube, and is atomized by the atomizing gas to become For small droplets, the atomizing gas pressure is 50 atmospheres; the atomized droplets are rapidly cooled and solidified under the action of the atomizing gas, and become powder.

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Abstract

An atomizing process for preparing the monotectic alloy powder with shell-type composite structure includes such steps as choosing proper monotectic alloy (Al-Pb, Cu-Fe, etc) and atomizing gas (N2, N2+O2, or Ar), promoting or suppressing the heterocore forming behavior of the diffused liquid drops on the surface of atomized liquid drop in the liquid-liquid phase change procedure, and controlling the coagulation kinetics of atomized liquid drops.

Description

technical field [0001] The invention belongs to the preparation technology of monotectic alloy powder, in particular to an atomization preparation method of monotectic alloy powder with shell-type composite structure. Background technique [0002] The schematic phase diagram of a monotectic alloy is shown in figure 1 shown. This type of alloy exists in the liquid state in the immiscible temperature range of components (L 1 +L 2 ). When the homogeneous alloy melt is cooled to L 1 +L 2 region, it will undergo a liquid-liquid phase transition (L→L 1 +L 2 ). This type of alloy is very extensive, many of which have special mechanical and physical properties, and have good application prospects in industry, so their research has attracted more and more people's attention. In order to gain an in-depth understanding of the solidification characteristics of this type of alloy, material scientists at home and abroad have done a lot of experimental research work under ground a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08
Inventor 赵舜赵九洲胡壮麒
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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