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Deep super-cooling method for preparing directional difficult mixed dissolve Ni-Pb alloy

An immiscible alloy and deep supercooling technology, applied in the field of materials, can solve the problems of high production cost, difficulty in control, and insufficient time for separation, etc., and achieve easy solidification process, less volatile burning loss, and low supercooling degree Effect

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

AI Technical Summary

Problems solved by technology

Traditional directional solidification methods include power reduction method (PD), rapid solidification method (HRS), liquid cooling method (LMC), etc., but the use of these methods to prepare directional immiscible alloy materials requires consideration of interphase wetting, immiscibility Many factors such as the height of the zone, the slope of the liquidus line, the growth rate, the temperature gradient at the front of the solidification interface, etc., make the actual production process complex, difficult to control, and the production cost is also high
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. Process to prepare homogeneous Al-In monotectic alloy. The rapid cooling and rapid solidification technology is characterized by extremely fast solidification. Under rapid cooling, when the alloy passes through the immiscible zone, the solidification speed is so fast that the two phases do not have enough time to separate. Immiscible alloys with fine dispersed structure can also be obtained, but this method is difficult to prepare oriented immiscible alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Preparation of oriented Ni-25wt%Pb immiscible alloy material by deep supercooling

[0013] ①Put the Ni-25wt%Pb alloy material into the quartz crucible in the insulation shell, and add an appropriate amount of glass purifier on the upper and lower surfaces of the metal material; ②Inductively heat the alloy to 1173K through a high-frequency induction coil to melt the purifier Apply on the surface of the alloy; ③Heat up to 1650K, keep warm for 2 minutes; ④Heat to 1850K, keep warm for 2 minutes, and perform solidification-remelting-overheating cycle treatment. During the experiment, the temperature optical signal of the alloy is measured by the infrared probe and passed through the signal processing unit After the treatment, use the 3056 desktop recorder to continuously record the temperature change in real time and monitor the supercooling degree of the alloy. During the cooling process, when the undercooling degree reached 77K, Ni was used to artificially trigg...

Embodiment 2

[0014] Example 2: Preparation of oriented Ni-31.44wt% Pb immiscible alloy material by deep supercooling

[0015] ①Put the Ni-31.44wt%Pb alloy material into the quartz crucible in the insulation shell, and add an appropriate amount of glass purifier on the upper and lower surfaces of the metal material; ②Inductively heat the alloy to 1223K through a high-frequency induction coil to melt the purifier Coated on the surface of the alloy; ③Heat up to 1700K, keep warm for 2 minutes; ④Heat to 1900K, keep warm for 2 minutes, and perform solidification-remelting-overheating cycle treatment. During the experiment, the temperature optical signal of the alloy is measured by an infrared probe and processed After unit processing, use the 3056 desktop recorder to continuously record the temperature change in real time and monitor the supercooling degree of the alloy. During the cooling process, when the undercooling degree reached 96K, Ni was used to artificially trigger nucleation on the to...

Embodiment 3

[0016] Example 3: Preparation of oriented Ni-40wt%Pb immiscible alloy material by deep supercooling

[0017] ①Put the Ni-40wt%Pb alloy material into the quartz crucible in the insulation shell, and add an appropriate amount of glass purifier on the upper and lower surfaces of the metal material; ②Inductively heat the alloy to 1273K through a high-frequency induction coil to melt the purifier Apply on the surface of the alloy; ③heat up to 1750K, keep warm for 2 minutes; ④heat up to 1950K, keep warm for 2 minutes, and carry out solidification-remelting-overheating cycle treatment. During the experiment, the temperature optical signal of the alloy is measured by the infrared probe and passed through the signal processing unit After the treatment, use the 3056 desktop recorder to continuously record the temperature change in real time and monitor the supercooling degree of the alloy. During the cooling process, when the undercooling degree reached 110K, Ni was used to artificially...

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Abstract

A process for preparing orientated Ni-Pb alloy difficult to mix and dissolve mutural by deep over-cold features that the HF induction heater isused, and the fused glass cleaning and cyclic over-heat are combined to obtain the over-cold (77-110 deg.K). Its advantages are easy control, no need of vacuum environment, and less loss of Pb.

Description

technical field [0001] The invention relates to a method for preparing an oriented alloy material, in particular to a method for preparing an oriented Ni-Pb immiscible alloy through deep supercooling, and belongs to the field of material technology. Background technique [0002] The most notable feature of immiscible alloys is that there is a liquid phase immiscibility zone in the high temperature zone of the phase diagram. When the alloy melt drops from high temperature to this zone, the two liquid phases will automatically separate. It is easy to cause serious segregation and even form layered structure under the conditions of ground casting technology, which has no engineering practical value. If the second phase is dispersed and distributed by appropriate methods, this type of alloy has many special physical and mechanical properties. With the continuous deepening of people's understanding of the liquid-liquid phase separation mechanism of immiscible alloys, the rapid d...

Claims

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Application Information

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IPC IPC(8): B22D27/04C22C1/00C22C19/03
Inventor 马伟增郑红星季诚昌李建国
Owner SHANGHAI JIAO TONG UNIV
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