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Self-breeding rod and preparation method thereof as well as preparation method of hypoeutectic aluminum-silicon alloy semi-solid slurry

A technology of semi-solid slurry and aluminum-silicon alloy, which is applied in the preparation of hypoeutectic aluminum-silicon alloy semi-solid slurry, self-inoculation rod and its preparation field, and can solve the problem that self-inoculant cannot ensure uniform dispersion and block self-inoculation Solve the problems of complex preparation of reagents and long time-consuming electromagnetic stirring, and achieve the effect of short preparation cycle, small structure and round shape

Active Publication Date: 2018-12-14
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional electromagnetic stirring to prepare semi-solid slurry has been widely used in actual production, but electromagnetic stirring takes a long time, consumes a lot of energy, and the obtained primary phase structure is relatively coarse
Although the traditional self-inoculant method can greatly shorten the slurry preparation cycle, the preparation of block-shaped self-inoculant is complicated; and once the self-inoculant is put in, uniform dispersion cannot be guaranteed, and the effect is greatly reduced

Method used

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  • Self-breeding rod and preparation method thereof as well as preparation method of hypoeutectic aluminum-silicon alloy semi-solid slurry
  • Self-breeding rod and preparation method thereof as well as preparation method of hypoeutectic aluminum-silicon alloy semi-solid slurry
  • Self-breeding rod and preparation method thereof as well as preparation method of hypoeutectic aluminum-silicon alloy semi-solid slurry

Examples

Experimental program
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Effect test

preparation example Construction

[0044] The invention provides a method for preparing a self-inoculating rod, comprising the steps of:

[0045] (1) Conduct energy spectrometer composition identification on the purchased aluminum-silicon alloy base material to determine the alloy composition;

[0046] (2) Perform differential thermal analysis on the purchased aluminum-silicon alloy base material to determine the temperature range of the solid-liquidus line of the alloy;

[0047] (3) Using a resistance furnace to heat the A356 aluminum-silicon alloy base material with a silicon content of 5% to 8% at 750°C, and after it is completely melted, pour it into a copper mold for rapid cooling;

[0048] (4) Cut the rapidly cooled metal plate into long strips with a cross section of 10mm×10mm and a length of 200mm by wire cutting; remove the surface oxide skin through sandpaper polishing, and put it in a drying oven for standby.

[0049] The present invention also provides a self-inoculating rod, which is prepared by u...

Embodiment 1

[0061]Use a resistance furnace to melt the A356 alloy base material with a silicon content of 5% to 8%. After stirring, degassing, refining, slag removal, and standing, move it to a crucible on an electromagnetic stirrer with a preheating temperature of 640°C. . When the temperature of the molten metal is stabilized at 640°C, turn off the heating function of the electromagnetic stirrer, turn on the electromagnetic stirrer with a stirring frequency of 30 Hz and a stirring power of 90%, and then insert a self-incubating glass with an initial temperature of 20°C (room temperature) into the crucible. When the temperature of the molten metal drops to 610°C, pull out the self-inoculation rod; then keep electromagnetic stirring, when the temperature of the molten metal drops to 600°C, stop the electromagnetic stirring, take a sample with a sampling spoon, put it into brine for rapid cooling, and prepare gold Phase sample observation.

[0062] Such as figure 1 As shown, in the quenc...

Embodiment 2

[0064] Use a resistance furnace to melt the A356 alloy base material with a silicon content of 5% to 8%. After stirring, degassing, refining, slag removal, and standing, move it to a crucible on an electromagnetic stirrer with a preheating temperature of 640°C. . When the temperature of the molten metal is stabilized at 640°C, turn off the heating function of the electromagnetic stirrer, turn on the electromagnetic stirrer with a stirring frequency of 30 Hz and a stirring power of 90%, and then insert a self-incubating glass with an initial temperature of 20°C (room temperature) into the crucible. When the temperature of the molten metal drops to 605°C, pull out the self-inoculation rod; then keep electromagnetic stirring, when the temperature of the molten metal drops to 600°C, stop the electromagnetic stirring, take a sample with a sampling spoon, put it into brine for rapid cooling, and prepare gold Phase sample observation.

[0065] Such as figure 2 As shown, in the que...

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Abstract

The invention discloses a preparation method of hypoeutectic aluminum-silicon alloy semi-solid slurry. The preparation method comprises the following steps: step 1, heating a aluminum-silicon alloy base material until the base material is completely melted into a metal liquid, fully stirring to ensure the alloy compositions uniform, and standing still after degassing, refining and drossing; at thesame time, preheating an electromagnetic stirrer and then keeping warm; step 2, transferring the metal liquid after standing still to a crucible on the electromagnetic stirrer for standing, and stopping heating after the temperature is stabilized; step 3, starting to perform electromagnetic stirring on the metal liquid, inserting a self-breeding rod directly into the metal liquid, maintaining theelectromagnetic stirring, and pulling out the self-breeding rod when the temperature is lowered to 605-615 DEG C; step 4, turning off the electromagnetic stirrer when the temperature is lowered to 600 DEG C, and obtaining the hypoeutectic aluminum-silicon alloy semi-solid slurry; wherein, the aluminum-silicon alloy base material used in the preparation process of the self-breeding rod used in thestep 3 is the same as the aluminum-silicon alloy base material used in the step 1. The invention further discloses the self-breeding rod and the preparation method thereof.

Description

technical field [0001] The invention belongs to the technical field of metal semi-solid slurry preparation, and in particular relates to a self-inoculating rod and a preparation method thereof, and a method for preparing a hypoeutectic aluminum-silicon alloy semi-solid slurry. Background technique [0002] Metal semi-solid rheological forming technology is one of the most promising metal forming technologies in the 21st century. [0003] In the process of semi-solid rheological deformation, through reasonable control of solidification conditions, in the solid-liquid two-phase region, the primary phase is spherical or nearly spherical, and is evenly distributed in the liquid phase. This special mixture is called semi-solid slurry material. Thanks to the lower pouring temperature, high viscosity and good fluidity of the semi-solid slurry, compared with the traditional liquid forming technology (high pressure casting, squeeze casting, etc.), the semi-solid rheological forming ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/00C22C1/03
CPCC22C1/03C22C21/02C22C1/12
Inventor 王金国王会檀姜启川闫瑞芳王慧远
Owner JILIN UNIV
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