Preparation method for primary-silicon-refinement high-silicon aluminum alloy rheological slurry

A high-silicon aluminum alloy and primary silicon technology is applied in the field of preparation of high-silicon aluminum alloy rheological slurry, which can solve the problems of high-silicon aluminum alloy primary silicon coarseness, etc., and achieve excellent mechanical properties, which are beneficial to industrial production and high efficiency. Effect

Active Publication Date: 2014-07-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a high-silicon aluminum alloy rheological slurry for primary silicon refinement in view of the lack of primary silicon refinement effect of high-silicon aluminum alloys in the current industrial technology and the problem of coarse primary silicon of high-silicon aluminum alloys Preparation

Method used

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  • Preparation method for primary-silicon-refinement high-silicon aluminum alloy rheological slurry
  • Preparation method for primary-silicon-refinement high-silicon aluminum alloy rheological slurry
  • Preparation method for primary-silicon-refinement high-silicon aluminum alloy rheological slurry

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Embodiment 1

[0040] Al-18Si alloy primary silicon refinement and preparation of rheological slurry. The alloy was melted in a crucible resistance furnace, degassed and refined at 780°C, left to stand for 10 minutes, and then the temperature of the melt was lowered to 760°C. Set the inclination angle of the mechanical drum to 45°, the rotational speed to 100r / min, and preheat the inner wall of the drum to 300°C. The refined alloy melt was poured into a mechanical drum at 760°C for rheological treatment, and the treated melt was directly quenched in water for microstructure observation. figure 1 Shown is the microstructure of Al-18Si alloy directly water-quenched without semi-solid treatment, figure 2 It is the microstructure of the alloy rheological slurry after water quenching after being treated by the method of the present invention. From figure 1 , 2 It can be clearly seen that after the treatment of the present invention, the primary silicon size of the Al-18Si alloy is significan...

Embodiment 2

[0042] Al-18Si alloy primary silicon refinement and preparation of rheological slurry. The alloy was melted in a crucible resistance furnace, degassed and refined at 778°C, and allowed to stand for 10 minutes, then the temperature of the melt was lowered to 760°C. Set the inclination angle of the mechanical drum to 10°, the rotational speed to 20 r / min, and preheat the inner wall of the drum to 300°C. The refined alloy melt is poured into a mechanical drum at 760°C for rheological treatment, and the treated melt is directly die-cast to obtain high-silicon aluminum alloy castings.

Embodiment 3

[0044] Al-30Si alloy primary silicon refinement and preparation of rheological slurry. The alloy was melted in a crucible resistance furnace, degassed and refined at 880°C, left to stand for 15 minutes, and then the temperature of the melt was lowered to 860°C. Set the inclination angle of the mechanical drum to 30°, the speed to 30r / min, and preheat the inner wall of the drum to 300°C. The refined alloy melt was poured into a mechanical drum at 860°C for rheological treatment, and the treated melt was directly quenched in water for microstructure observation. image 3 Shown is the microstructure of Al-30Si alloy directly water quenched without semi-solid treatment, Figure 4 It is the microstructure of the alloy rheological slurry after water quenching after being treated by the method of the present invention. From image 3 , 4 It can be clearly seen that after the treatment of the present invention, the primary silicon size of the Al-30Si alloy is significantly refined,...

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Abstract

The invention discloses a preparation method for primary-silicon-refinement high-silicon aluminum alloy rheological slurry. The preparation method concretely comprises the steps that an aluminum alloy casting coating is smeared on the inner wall of a mechanical roller, dried and preheated; the tilt angle, relative to the ground horizontal line, of the mechanical roller is set to be 10 degrees-45 degrees, and the stirring rate is set to be 20 r / min-250 r / min; with the temperature of a high-silicon aluminum alloy melt kept at 30DEG C-50 DEG C above the liquid line, the high-silicon aluminum alloy melt is cast quickly into the mechanical roller and stirred to obtain the rheological slurry. The rheological slurry flowing out after being stirred is stored in a holding furnace, furnace temperature is kept at a superheat degree of 5 DEG C-15 DEG C above the liquid line, and immediately subsequent casting formation is performed on the rheological slurry within 10 seconds-20 seconds. The preparation method is short in treating process, high in efficiency and beneficial to industrial production. The prepared slurry can be made into castings with high surface smoothness and excellent mechanical properties by the adoption of high pressure, extrusion casting and other forming technologies, and therefore the slurry is an excellent choice for preparing high-quality high-silicon aluminum alloy and has huge market application potential.

Description

technical field [0001] The invention belongs to the field of semi-solid metal forming, and relates to a method for preparing an aluminum-silicon alloy, in particular to a method for preparing a primary silicon-refined high-silicon aluminum alloy rheological slurry. Background technique [0002] Aluminum accounts for 8.13wt% of the total crust, and is one of the most abundant elements among metal elements. Aluminum and aluminum alloys have the characteristics of low density, light weight, high specific strength, good corrosion resistance, and excellent electrical and thermal conductivity. They are non-ferrous metal materials that are widely used in reality. With the rise of crude oil prices, the requirements of social environmental protection and the rapid development of manufacturing technology, under the requirements of energy saving, weight reduction and environmental protection, the materials used in transportation, aerospace and other industrial fields have increased the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/04B22D27/20
Inventor 胡钊华吴国华魏广玲丁文江莫文飞
Owner SHANGHAI JIAO TONG UNIV
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