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A method and device for measuring the subcooling degree of rapid solidification of metal droplets

A technology of subcooling and metal particles, which is applied in the investigation stage/state change, etc., can solve the problems of inability to test the subcooling degree and the low cooling rate of the metal melt, so as to avoid heterogeneous nucleation, strong repeatability, Thermal history consistent effect

Active Publication Date: 2017-02-15
GAOYOU INST CO LTD DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, metal undercooling can usually be measured by means of differential scanning calorimetry (DSC) or thermal analyzer (DTA), but only after the material is prepared, and due to equipment limitations, the cooling rate of the metal melt All are not high, unable to test the subcooling degree of the rapid solidification process

Method used

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  • A method and device for measuring the subcooling degree of rapid solidification of metal droplets
  • A method and device for measuring the subcooling degree of rapid solidification of metal droplets
  • A method and device for measuring the subcooling degree of rapid solidification of metal droplets

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Embodiment 1

[0038] Such as figure 1 The device used in the method for measuring the subcooling degree of rapid solidification of metal droplets shown includes a vacuum system, a droplet ejection system, an image acquisition system and a droplet temperature testing system, and the droplet temperature testing system is installed Inside the vacuum system, the droplet injection system is installed directly above the droplet temperature testing system, and the image acquisition system is connected to the vacuum chamber of the vacuum system.

[0039] The vacuum system includes a vacuum chamber 7, a mechanical pump 30 and a diffusion pump 29. The diffusion pump is installed on the side wall of the vacuum chamber, the mechanical pump is connected to the diffusion pump, and the vacuum chamber is also equipped with a cavity intake pipe 31 and The crucible inlet pipe 32, before vacuuming, closes the cavity inlet pipe and the crucible inlet pipe through a valve, and the vacuum degree in the vacuum ch...

Embodiment 2

[0081] Embodiment 2 is identical with device and assay method in embodiment 1, and the different related parameters of this device and method are as follows:

[0082] (1) The aperture of the small hole 8 in the device is 0.150 mm, and the vibration frequency of the piezoelectric ceramic is 700 Hz;

[0083] (2) Step 1, in the preparation of metal microparticle droplets by the pulse micropore method (2) vacuuming: use the mechanical pump 30 and the diffusion pump 29 to vacuumize the crucible 3 and the vacuum chamber 7 to a vacuum degree of 0.0009Pa;

[0084] (3) Step 1, in the preparation of metal microparticle droplets by pulse microporous method (3) molten metal: after the metal material is completely melted, keep it warm for 20 minutes;

[0085] (4) Step 1, the pulse microporous method in the preparation of metal microparticle droplets (4) pulse jetting: pass inert gas into the crucible 3 through the crucible inlet pipe 32, so that a stable differential pressure is reached be...

Embodiment 3

[0087] Embodiment 3 is identical with device and measuring method in embodiment 1, and the different related parameters of this device and method are as follows:

[0088] (1) The diameter of the small hole in the device is 1.500 mm, and the vibration frequency of the piezoelectric ceramic is 1 Hz;

[0089] (2) Step 1, in the preparation of metal microparticle droplets by the pulse microporous method (2) vacuuming: use the mechanical pump 30 and the diffusion pump 29 to vacuumize the crucible 3 and the vacuum chamber 7 to a vacuum degree of 0.0007Pa;

[0090] (3) Step 1, in the preparation of metal microparticle droplets by pulse micropore method (3) molten metal: after the metal material is completely melted, it is kept for 30 minutes;

[0091] (4) Step 1, the pulse microporous method in the preparation of metal microparticle droplets (4) pulse jetting: pass inert gas into the crucible 3 through the crucible inlet pipe 32, so that a stable differential pressure is reached betw...

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Abstract

The invention provides a method for determining condensate depression of metal micro-drops during a rapid solidification process and a device used by the method, belonging to the technical field of metal physical performance test. The method comprises the following steps: firstly, preparing metal microparticle liquid drops by using a pulse micro-pore method; then respectively determining temperatures of the metal microparticle liquid drops dropping into oil at a starting moment and a balancing moment from different positions in a falling process; and finally, carrying out heat balance calculation to obtain liquid phase content, nucleation temperature and condensate depression of the metal microparticle liquid drops at different positions. The device used by the method comprises a vacuum system, a liquid drop spraying system, an image acquisition system and a liquid drop temperature testing system, wherein the liquid drop temperature testing system is mounted in a vacuum system; the liquid drop spraying system is mounted above the liquid drop temperature testing system; the image acquisition system is connected to a vacuum cavity of the vacuum system. The method can be used for monitoring and determining the condensate depression of the metal micro-drops during the rapid solidification process in real time; the device solves the problem of existing thermal analytical equipment that the rapid solidification process cannot be tested in real time due to low cooling speed.

Description

technical field [0001] The invention belongs to the technical field of metal physical performance testing, in particular to a method for measuring the supercooling degree of rapid solidification of metal, and also relates to a measuring device thereof. Background technique [0002] Containerless rapid solidification is a process in which metals and alloys are transformed from liquid to solid at a very fast rate at a much faster cooling rate than in conventional processes. The nucleus and the structure after solidification have a great influence, and it is expected to obtain a structure with uniform composition and fine grains. [0003] The microparticles prepared by the pulsed microporous method (POEM) have the characteristics of uniform size and high sphericity, and because the droplet landing process is rapid solidification without a container, it avoids uncontrollable factors such as heterogeneous nucleation induced by the droplet wall. This will further ensure that the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/06
Inventor 董伟许富民赵丽李颖
Owner GAOYOU INST CO LTD DALIAN UNIV OF TECH
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