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Deep super-cooling method for preparing big bulk homogeneous difficult mixed dissolve Ni-Pb alloy

A technology of immiscible alloys and homogeneous alloys, applied in the field of materials, can solve the problems of different In particle sizes and performance degradation, and achieve the effects of easy control and less volatilization and burning loss.

Inactive Publication Date: 2003-07-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After literature search, it was found that Liu Yuan et al. wrote the article "Microstructure of Rapidly Solidified Al-In Monotectic Alloy" in "Acta Metallica Sinica", 2000, 12, p1233-1236. The homogeneous Al-In monotectic alloy is prepared by the process, and the In particles are macroscopically evenly distributed on the entire sample section, but the In particles are of different sizes. On the other hand, if the thin strip sample is to be practical, it must be followed by powder metallurgy technology. Processing, leading to serious performance degradation after processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Preparation of large-volume Ni-25wt% Pb alloy by deep supercooling

[0013] ①Put the weighed Ni-25wt%Pb alloy material into the quartz crucible in the insulation sleeve, and add an appropriate amount of glass purifier on the upper and lower surfaces of the metal material; ②Heat the alloy to 1173K by high frequency induction, and keep it warm for 0.5 minutes; ③ Raise the temperature to about 1650K and keep it for 2 minutes; ④Heat to about 1900K and keep it for 2 minutes to perform solidification-remelting-overheating cycle treatment, and use the 3056 desktop recorder to monitor the supercooling degree of the alloy. When the subcooling degree is 308K, after the solidification, the sample is cooled to 1073K for water quenching to obtain a Ni-25wt%Pb alloy with uniform dispersion of Pb.

Embodiment 2

[0014] Example 2: Preparation of large-volume Ni-31.44wt% Pb alloy by deep subcooling

[0015] ①Put the weighed Ni-31.44wt%Pb alloy material into the quartz crucible in the insulation sleeve, and add an appropriate amount of glass purifier on the upper and lower surfaces of the metal material; ②Heat the alloy to 1223K by high-frequency induction, and keep it warm for 0.5 minutes; ③Raise the temperature to about 1700K, keep it warm for 2 minutes; ④Heat it to about 1873K, keep it warm for 2 minutes, carry out solidification-remelting-overheating cycle treatment, and monitor the supercooling degree of the alloy. When the subcooling degree is 286K, after the solidification, the sample is cooled to about 1073K for water quenching to obtain a Ni-31.44wt%Pb alloy with uniform and dispersed distribution of Pb.

Embodiment 3

[0016] Example 3: Preparation of large-volume Ni-40wt%Pb alloy by deep supercooling

[0017] ①Put the weighed Ni-40wt%Pb alloy material into the quartz crucible in the insulation sleeve, and add an appropriate amount of glass purifier on the upper and lower surfaces of the metal material; ②Heat the alloy to 1273K by high-frequency induction, and keep it warm for 0.5 minutes; ③ Raise the temperature to about 1750K and keep it warm for 2 minutes; ④Heat to about 1950K and keep it warm for 2 minutes, carry out solidification-remelting-overheating cycle treatment, and monitor the supercooling degree of the alloy. When the subcooling degree is 292K, after the solidification, the sample is cooled to about 1073K for water quenching treatment to obtain a Ni-40wt%Pb alloy with uniform and dispersed distribution of Pb.

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Abstract

A process for preparing large-volume homogeneous Ni-Pb alloy difficult to mix and dissolve mutually by deep over-cold method features that the HF induction heater is used, and the fused glass cleaning and cyclic over-heat are combined to obtain deep over-cold which is equal to or higher than 250 deg.C. Its advantages are easy control, no need of vacuum environment, and less fire and loss of Pb.

Description

technical field [0001] The invention relates to a method for preparing a large-volume homogeneous Ni-Pb alloy, in particular to a method for preparing a large-volume homogeneous Ni-Pb immiscible alloy by deep supercooling, which belongs to the field of material technology. Background technique [0002] There is a liquid-phase immiscibility zone in the phase diagram of immiscible alloys. When the high-temperature melt enters this zone, the two liquid phases with a significant difference in density will segregate seriously and even have components separated under the action of the gravitational field. layer phenomenon, so the conventional technology on the ground cannot prepare homogeneous immiscible alloys with practical value. In recent years, with the rapid development of modern material preparation technology and the requirements for special properties of immiscible alloys, this type of alloy has become a hot research topic in the field of materials science, and a variety ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/00C22C19/03
Inventor 郑红星马伟增季诚昌李建国
Owner SHANGHAI JIAO TONG UNIV
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