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Method and apparatus for preparing small metal semi-solid slurry in solidification zone

A technology of semi-solid slurry and solidification interval, which is applied in chemical instruments and methods, dissolution, mixers, etc., and can solve the problem of inability to accurately control the solid phase rate of small metal semi-solid slurry in the solidification interval

Inactive Publication Date: 2009-12-30
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the deficiency of the existing electromagnetic stirring method that "the solid phase rate of the small metal semi-solid slurry in the solidification interval cannot be accurately controlled", and provide a method that can accurately control the solid phase ratio of the small metal semi-solid slurry in the solidification interval. Preparation method and device of semi-solid slurry with phase ratio

Method used

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  • Method and apparatus for preparing small metal semi-solid slurry in solidification zone
  • Method and apparatus for preparing small metal semi-solid slurry in solidification zone
  • Method and apparatus for preparing small metal semi-solid slurry in solidification zone

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Experimental program
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Embodiment approach 1

[0027] Under the condition that the power of the electromagnetic stirring device is 10kW, the specific steps of the method for preparing aluminum semi-solid slurry in the present invention:

[0028] Step 1, prepare pure aluminum liquid, the temperature is controlled at the aluminum liquidus temperature t 液 +50=708℃;

[0029] Step 2, pour the above-mentioned aluminum liquid into the preheating temperature to be the aluminum solidus temperature t 固 In the graphite crucible 2 of =658°C, the graphite crucible 2 is preheated by the preheating heating tube 3 in its wall, and after the upper cover 9 is covered, the Ar gas is connected to prevent oxidation;

[0030] Step 3, turn off the power supply of the preheating heating tube 3, start the electromagnetic stirring device, and stir the aluminum melt;

[0031] Step 4, open and adjust the power supply of the heating tube 5 to heat the heating zone, and simultaneously open and adjust the cooling water of the cooling tube 4 to cool th...

Embodiment approach 2

[0034] The difference from Embodiment 1 is: the temperature t of the thermocouple 11 in the heating zone 热 Control the temperature t of the thermocouple 11 in the cooling zone at 666°C 冷 Control it at 648°C, and after stabilizing stirring for 15 minutes, adjust the power supply of the heating tube 5, and adjust the temperature of the thermocouple 11 in the heating zone to t 热 Control at 668°C, adjust the cooling water in the cooling pipe 4, and set the temperature t of the thermocouple 11 in the cooling zone冷 The temperature is controlled at 648° C. to obtain aluminum semi-solid slurry 6 with a stable solid phase ratio of 30%.

Embodiment approach 3

[0036] The difference with Embodiment 1 is: the temperature control t of the thermocouple 11 in the heating zone 热 At 1090°C, the temperature t of the thermocouple 11 in the cooling zone 冷 Control it at 1075°C, and after stabilizing stirring for 15 minutes, adjust the power supply of the heating tube 5, and adjust the temperature of the thermocouple 11 in the heating zone to t 热 Control at 1095°C, adjust the cooling water in the cooling pipe 4, and set the temperature t of the thermocouple 11 in the cooling zone 冷 Controlled at 1075°C, a copper semi-solid slurry 6 with a stable solid phase ratio of 54% was obtained.

[0037] attached image 3 The microstructure of the aluminum semi-solid slurry with a solid phase rate of 40% prepared by the method of the present invention, the white part in the shape of a spherical or ellipsoid in the figure is the primary solid phase particles, it can be seen that the method of the present invention can be used to prepare small metal in the...

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Abstract

The invention discloses small metal semisolid slurry manufacturing method and device in freezing range. It is based on routine electromagnetic stirring method, symmetrically distributed the cooling and heating areas along the crucible wall inner circle. The cooling area is used to derive heat quantity from the fused mass to generate nascent dendrite. The heating area is used to induct heat quantity to control fused mass crystallization latent heat releasing quantity. Thus the small metal fused mass crystallization latent heat releasing course can be controlled. Further its solid phase ratio can be controlled.

Description

technical field [0001] The invention relates to an electromagnetic stirring preparation method and device for small metal semi-solid slurry in the solidification interval. Background technique [0002] According to reports in the literature "Flemings M. Behavior of metal alloys in the semisolid state, MetallTrans, 1991, 22A: 957-981" and "Mao Weimin. Semisolid Metal Forming Technology, Beijing: Mechanical Industry Press, 2004", from the high temperature liquid state through The ideal method for preparing semi-solid slurry by cooling and stirring mainly includes the electromagnetic stirring method. The basic idea of ​​the electromagnetic stirring method is to break the primary dendrites with the help of electromagnetic stirring during the cooling and solidification process of the metal melt in the solid-liquid two-phase region, and form a semi-solid slurry in which primary solid phase particles are suspended in the liquid phase. The larger the solidification interval of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D1/00B22D27/02B22D17/30B01F13/08
Inventor 张鹏杜云慧刘汉武
Owner BEIJING JIAOTONG UNIV