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Preparation method of in-situ synthesized hypereutectic aluminum-silicon alloy alterant

An aluminum-silicon alloy, in-situ autogenous technology, applied in the field of in-situ autogenous hypereutectic aluminum-silicon alloy modifier and preparation, can solve the problems of poisoning, inability to achieve simultaneous modification of eutectic silicon and primary silicon, and cost increase.

Inactive Publication Date: 2015-06-17
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adding P to modify primary silicon, Sr to modify eutectic silicon, or a composite modifier of P and Sr, it is impossible to achieve a single modifier to modify eutectic silicon and primary silicon at the same time. Complex process and high cost

Method used

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  • Preparation method of in-situ synthesized hypereutectic aluminum-silicon alloy alterant
  • Preparation method of in-situ synthesized hypereutectic aluminum-silicon alloy alterant
  • Preparation method of in-situ synthesized hypereutectic aluminum-silicon alloy alterant

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preparation example Construction

[0012] The object of the present invention is to provide an in-situ self-generated hypereutectic aluminum-silicon alloy modifier and a preparation method. The mass percentage of silicon in the involved hypereutectic aluminum-silicon alloy is 18% to 22%; the modification process steps include:

[0013] (1) Put the aluminum ammonium sulfate inorganic salt in a resistance crucible furnace, stir for 5-30 minutes after it is completely melted, and then keep warm to completely dehydrate the aluminum ammonium sulfate.

[0014] (2) Melt the hypereutectic aluminum-silicon alloy and overheat it to 900°C~950°C, wrap the preheated aluminum ammonium sulfate with aluminum foil, press it into the alloy melt with a bell jar, and keep stirring to make it completely react .

[0015] (3) Cool down the melt in step (2). When the temperature of the melt drops to 700°C~750°C, use CCl 6 Casting after refining, degassing and slag removal.

[0016] The in-situ autogenous hypereutectic aluminum-silic...

Embodiment 1

[0020] (1) Using aluminum ingots and industrial crystalline silicon to prepare a hypereutectic aluminum-silicon alloy with a silicon content of 20%. (2) Put the ammonium aluminum sulfate containing crystal water into the crucible, and put it into a resistance crucible furnace with a furnace temperature of 200°C, stir it after melting, stir for 5 minutes, and then keep it warm at a furnace temperature of 200°C 1 hour. (3) Heating and melting the hypereutectic aluminum-silicon alloy, and overheating the melt to 900°C, wrapping aluminum ammonium sulfate with a preheating temperature of 160°C with aluminum foil, and pressing it into the alloy melt with a bell jar to make it completely react , micron-sized Al 2 o 3 The amount of particles generated was 0.2% of the total mass of the melt. (4) The melt is cooled to 720°C, using CCl 6 Refining and degassing, slag removal and casting.

Embodiment 2

[0022] Step (1) is the same as in Example 1. In step (2), after the aluminum ammonium sulfate is completely melted at 220°C, it is stirred for 10 minutes, and then kept at a furnace temperature of 220°C for 2 hours. In step (3), after the temperature of the alloy melt is overheated to 930°C, wrap the aluminum ammonium sulfate bell jar with aluminum foil and press it into the alloy melt to make it react completely, micron-sized Al 2 o 3 The amount of particles generated was 0.4% of the total mass of the melt. Step (4) is the same as in Example 1.

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Abstract

The invention discloses a preparation method of an in-situ synthesized hypereutectic aluminum-silicon alloy alterant, which comprises the following steps: (1) feeding a crystal water containing aluminum ammonium sulfate inorganic salt into a clay graphite crucible, putting the crucible in a resistance furnace with a hearth at a temperature of 200-240 DEG C, after aluminum ammonium sulfate is completely melted, stirring for 5-30 minutes, and carrying out heat preservation at the temperature, so that the aluminum ammonium sulfate is completely dehydrated; (2) melting a hypereutectic aluminum-silicon alloy, after the alloy is overheated to 900-950 DEG C, coating the preheated aluminum ammonium sulfate with an aluminum foil, pressing the obtained object in an alloy melt by using an immersion bell, and constantly stirring until the obtained object is completely reacted; and (3) cooling the melt obtained in the step (2), and when the temperature of the melt is reduced to 700-750 DEG C, carrying out CCl6 refining, degassing and slagging-off on the melt, and forming the obtained product by pouring.

Description

technical field [0001] The invention belongs to the technical field of hypereutectic aluminum-silicon alloy modification, and relates to an in-situ self-generated hypereutectic aluminum-silicon alloy modification agent and a preparation method. Background technique [0002] Hypereutectic aluminum-silicon alloys are widely used in aerospace and automotive fields due to their excellent casting properties, low density, low thermal expansion coefficient, excellent thermal conductivity, high strength, and good wear and corrosion resistance. . In the field of automobiles, hypereutectic aluminum-silicon alloy is used as an ideal substitute material for traditional cast iron to make wear-resistant parts such as automobile engine pistons and cylinder liners. It can not only improve the working efficiency of the engine, but also reduce the weight of the automobile and improve fuel efficiency. and reduce exhaust emissions. [0003] However, in the traditional casting of hypereutectic...

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/02
CPCC22C21/04C22C1/026C22C1/06
Inventor 李庆林兰晔峰丁万武王平波申永前
Owner LANZHOU UNIVERSITY OF TECHNOLOGY