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Multi-mode excitation deep supercooling directional solidification device and method

A technology of directional solidification and deep undercooling, applied in the direction of improving process efficiency, etc., can solve the problems of complicated processes, inability to perform in-situ melting and directional solidification, and single excitation method, so as to achieve sufficient melting, improve material utilization and production. The effect of less defects such as efficiency and shrinkage

Active Publication Date: 2020-06-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a deep supercooled directional solidification device with multi-mode excitation, which aims to solve the problems of single excitation mode, complicated process and inability to perform in-situ melting plus directional solidification in the prior art.

Method used

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  • Multi-mode excitation deep supercooling directional solidification device and method
  • Multi-mode excitation deep supercooling directional solidification device and method
  • Multi-mode excitation deep supercooling directional solidification device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] 1. Prepare 1kg of 302 stainless steel (1Cr18Ni9) alloy raw material and put it into the crucible; according to B 2 O 3 , Na 2 B 4 O 7 The ratio is 1:1 to prepare the glass cleaner and put it into the dosing spoon.

[0103] 2. Turn on the vacuum pump 8 to pump the sealed chamber to 1×10 -6 Pa, and then fill the sealed chamber with high-purity argon to 0.8×10 5 Pa, repeat this process five times. Start the smelting device 2 and increase the heating power, observe the melting of the alloy through the thermometer 3, and keep the temperature for 30 minutes after the alloy is completely melted.

[0104] 3. Add the glass purifying agent into the crucible through the feeding device 4, heat the sample to overheat 250K and keep it for 10 minutes, then turn off the power of the smelting device 2, and repeat the above steps five times after the sample is cooled to room temperature.

[0105] 4. When the alloy temperature drops to 50K subcooling, start the power supply of the ...

Embodiment 2

[0108] 1. Prepare 5kg of Monel K500 nickel-based alloy raw material and put it into the crucible; 2 O 3 Put the glass cleaner into the dosing spoon.

[0109] 2. Turn on the vacuum pump 8 to pump the sealed chamber to 1×10 -6 Pa, and then fill the sealed chamber with high-purity helium to 1×10 5 Pa, repeat this process three times. Start the smelting device 2 and increase the heating power, observe the melting of the metal through the thermometer 3, and keep the temperature for 30 minutes after the metal is completely melted.

[0110] 3. Add the glass purifying agent into the crucible through the feeding device 4, heat the sample to overheat 300K and keep it for 20 minutes, then turn off the power of the smelting device 2, and repeat the above steps six times after the sample is cooled to room temperature.

[0111] 4. When the alloy temperature drops to 230K subcooling degree, start the power supply of the pulling device 7, pull down the crucible at a rate of 1mm / s and just...

Embodiment 3

[0114] 1. Prepare 0.01kg of metal raw material according to the atomic ratio of Ti, Ni, Al, and Cr at 14:3:2:1 and put it into the crucible; according to SiO 2 , B 2 O 3 , CaO, Al 2 O 3 , Na 2 O, K 2 The ratio of O is 5:2:2:1:1:1 to prepare the glass cleaner and put it into the feeding spoon.

[0115] 2. Turn on the vacuum pump 8 to pump the sealed chamber to 1×10 -6 Pa, and then fill the sealed chamber with a mixture of high-purity helium and argon at a ratio of 1:3 to 0.5×10 5 Pa, repeat this process three times. Start the smelting device 2 and increase the heating power, observe the melting of the metal through the thermometer 3, and keep the temperature for 10 minutes after the metal is completely melted.

[0116] 3. Add the glass purifying agent into the crucible through the feeding device 4, heat the sample to overheat 100K and keep it for 5 minutes, then turn off the power of the smelting device 2, and repeat the above steps twice after the sample is cooled to r...

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Abstract

The invention relates to the technical field of directional solidification, in particular to a multi-mode excitation deep supercooling directional solidification device and method. The multi-mode excitation deep supercooling directional solidification device comprises a reaction furnace, a smelting device, a feeding device, an excitation device, a drawing rod and a drawing device, wherein the feeding device is used for adding a purifying agent into a crucible in a hot melting process, the excitation device comprises an excitation chamber capable of being filled with liquid metal, a water cooling ring layer and a liquid level controller communicating with the excitation chamber, the liquid level controller is used for controlling the liquid level of the liquid metal in the excitation chamber, and the drawing device is capable of pulling at least a portion of the crucible into the excitation chamber at a predetermined speed range by means of the drawing rod. According to the directionalsolidification device, deep supercooling of melt is achieved through a method of combining glass purification and circulating superheating, moreover, smelting, liquid metal / water dual cooling and thedrawing device are ingeniously combined, different modes can be selected to stimulate directional solidification of the deep supercooled melt, and therefore deep supercooled directional solidificationcastings with different structures and performance characteristics can be obtained, and more research and application requirements are met.

Description

technical field [0001] The invention relates to the technical field of directional solidification, in particular to a multi-mode excitation deep undercooling directional solidification device and method. Background technique [0002] The deep undercooling method is to try to avoid the nucleation of heterogeneous crystal nuclei in the metal and alloy liquid through various effective purification methods, increase the critical nucleation work and inhibit the homogeneous nucleation, so that the liquid metal is difficult to obtain under conventional solidification conditions. The achieved supercooling is an effective way to achieve rapid solidification of three-dimensional bulk liquid metals. At present, the main methods for realizing deep and supercooling of melts mainly include droplet emulsification method, circulating superheating method, molten glass purification method and various containerless processing technologies. The supercooled melt often has its unique structure c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/04C22C1/02C22C1/06C22C33/04C21C7/076
CPCB22D27/045C21C7/076C22C1/02C22C1/06C22C33/04Y02P10/20
Inventor 阮莹李星吾魏炳波
Owner NORTHWESTERN POLYTECHNICAL UNIV
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