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Rapid solidification system and method for suspension large-dimension metal liquid drops under micro-gravity condition

A metal droplet and microgravity technology, applied in the field of space materials science, can solve the problems of small size of alloy samples and the inability to continuously and dynamically collect the temperature of falling droplets

Active Publication Date: 2020-06-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the above-mentioned problems in the prior art, the present invention provides a rapid solidification system and method for suspending large-sized metal droplets under microgravity conditions, which is used to solve the heterogeneous nucleation caused by the contact between the sample and the test tube wall in the prior art , Some active metals are easy to react with the test tube wall, the temperature of the falling droplet cannot be continuously and dynamically collected, and the size of the prepared alloy sample is small, etc. At least one technical problem

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  • Rapid solidification system and method for suspension large-dimension metal liquid drops under micro-gravity condition

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Experimental program
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Embodiment 1

[0098] The experimental steps of this embodiment are as follows:

[0099] S1: Accurately weigh raw materials according to the mass percentage of Ti-6%Al-4%V, and prepare alloy samples by arc melting method under inert gas protection conditions. The alloy sample is about 0.3 cm in diameter.

[0100] S2: Turn on the control system 40, rotate the control rod 93 of the sample feeding device 90, and put the alloy sample on the top surface of the sample feeding rod 91. A quenching medium container 61 is placed at the bottom of the vacuum cavity 80, and a quenching cooling medium 62 is contained in the container. The quenching cooling medium 62 is silicon oil. After the alloy sample is sent to the center of the suspension induction coil 71, the vacuum chamber 80 is evacuated to 2×10 by the vacuum system 10 -5 Pa. Close the vacuum system 10, and backfill the vacuum chamber 80 with inert gas to a standard atmospheric pressure. The inert gas is a mixed gas of argon and helium.

[...

Embodiment 2

[0104] The experimental steps of this embodiment are as follows:

[0105] S1: According to Co 50 Cu 50 Raw materials are accurately weighed by atomic percentage, and alloy samples are prepared by arc melting method under inert gas protection conditions. The alloy sample is about 1 cm in diameter.

[0106] S2: Turn on the control system 40, rotate the control rod 93 of the sample feeding device 90, and put the alloy sample on the top surface of the sample feeding rod 91. A quenching medium container 61 is placed at the bottom of the vacuum cavity 80, and a quenching cooling medium 62 is contained in the container. The quenching cooling medium 62 is liquid metal. After the alloy sample is sent to the center of the suspension induction coil 71, the vacuum chamber 80 is evacuated to 6×10 by the vacuum system 10 -6 Pa. Close the vacuum system 10, and backfill the vacuum chamber 80 with inert gas to a standard atmospheric pressure. The inert gas is helium.

[0107] S3: Turn ...

Embodiment 3

[0110] The experimental steps of this embodiment are as follows:

[0111] S1: According to Ni 45 Fe 40 Ti 15 Raw materials are accurately weighed by atomic percentage, and alloy samples are prepared by arc melting method under inert gas protection conditions. The alloy sample is about 2 cm in diameter.

[0112]S2: Turn on the control system 40, rotate the control rod 93 of the sample feeding device 90, and put the alloy sample on the top surface of the sample feeding rod 91. A quenching medium container 61 is placed at the bottom of the vacuum cavity 80, and a quenching cooling medium 62 is contained in the container. The quenching cooling medium 62 is silicon oil. After the alloy sample is sent to the center of the suspension induction coil 71, the vacuum chamber 80 is evacuated to 9×10 by the vacuum system 10 -7 Pa. Close the vacuum system 10, and backfill the vacuum chamber 80 with inert gas to a standard atmospheric pressure. The inert gas is helium, a mixed gas of...

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Abstract

The invention relates to a rapid solidification system for suspension large-dimension metal liquid drops under a micro-gravity condition. The rapid solidification system comprises a vacuum cavity, a suspension induction heating device, a motion detecting device and a rapid liquid quenching device, wherein the vacuum cavity comprises an electromagnetic suspension cavity, a micro-gravity cavity anda rapid liquid quenching cavity which are connected from top to bottom; the suspension induction heating device is provided with a tapered suspension induction coil which is formed by spiral winding,and the coil is arranged on the center of the electromagnetic suspension cavity for melting and suspending an alloy sample; the micro-gravity cavity is a hollow tube body, so that the alloy sample obtains micro-gravity; the motion detecting device is used for continuously and dynamically acquiring a temperature and a form of the alloy sample in dropping motion; and the rapid liquid cooling deviceis provided with a quenching cooling medium for realizing rapid liquid quenching solidification for the alloy sample. The rapid solidification system avoids heterogeneous nucleation generated by wallcontact while the sample is molten, so that the sample is deeply super-cooled, and therefore, tissue segregation caused by gravity effect is eliminated, and rapid solidification from millimeter-grademetal liquid drops to the centimeter-grade metal liquid drops is realized.

Description

technical field [0001] The invention belongs to the field of space material science and technology, in particular to a system and method for realizing rapid solidification of large-sized metal droplets under microgravity conditions. Background technique [0002] The microstructure of metal materials produced by traditional casting usually has many defects, such as coarse structure, shrinkage cavity and impurities. This greatly affects the preparation and development of high-quality materials. The rapid solidification method makes the alloy melt in a thermodynamic metastable state by means of deep supercooling or rapid cooling. At this time, there will be fierce competitive nucleation and growth between different phases in the liquid alloy, resulting in grain refinement in the final solidification structure. Solute retention, etc. [0003] The space environment has the characteristics of "ultra-high vacuum, microgravity, and no container". In the field of space material sci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08
CPCB22F9/082B22F2009/0836B22F2009/0844B22F2009/0848B22F2009/086
Inventor 阮莹李路远魏炳波
Owner NORTHWESTERN POLYTECHNICAL UNIV
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