System and method for rapid solidification of large-sized metal droplets suspended in microgravity

A metal droplet and microgravity technology, which is applied in the field of space material science, can solve the problems that the temperature of falling droplets cannot be continuously and dynamically collected, and the size of alloy samples is small, so as to achieve uniform solidification structure, avoid reaction, and inhibit segregation.

Active Publication Date: 2021-09-07
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
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  • Application Information

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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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  • System and method for rapid solidification of large-sized metal droplets suspended in microgravity
  • System and method for rapid solidification of large-sized metal droplets suspended in microgravity
  • System and method for rapid solidification of large-sized metal droplets suspended in microgravity

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Effect test

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 suspending large-sized metal droplets under microgravity conditions, comprising a vacuum cavity, a suspension induction heating device, a motion detection device and a rapid liquid quenching device. The vacuum chamber includes an electromagnetic suspension chamber, a microgravity chamber and a rapid liquid quenching chamber connected from top to bottom. The suspension induction heating device has a conical suspension induction coil formed by spiral winding, the coil is arranged in the center of the electromagnetic suspension cavity, and is used for melting and suspending the alloy sample. The microgravity cavity is a hollow tube, which enables the alloy sample to acquire microgravity. The motion detection device is used to continuously and dynamically collect the temperature and morphology of the falling alloy sample. The rapid liquid quenching device is provided with a quenching cooling medium, which is used to achieve rapid liquid quenching and solidification of the alloy sample. The invention avoids the heterogeneous nucleation caused by the contact of the vessel wall when the sample is melted to obtain deep supercooling, eliminates the tissue segregation caused by the action of gravity, and realizes the rapid solidification of the millimeter to centimeter-scale metal droplets.

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 Patents(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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