SU1286638A1 - Method of producing aluminium-silicon alloys - Google Patents

Abstract

The invention relates to the field of non-ferrous metallurgy and can be used in the preparation of complex-alloyed silicoaluminum-based alloys. The purpose of the invention is to improve the properties of alloys by increasing the absorption of alloying metals. For this reason, alloying metals (copper, nickel) are introduced into hypereutectic silicon-aluminum as alloys with zinc at a temperature of 900-1400 ° C. Due to the partial evaporation of zinc, the gas content of the alloy is reduced and the absorption of doping metals is improved. 1 hp f-ly, 1 tab. with (L

Description

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Pi3o6peTeHHe relates to non-ferrous metallurgy, namely, to the production of foundry alloys based on electrothermal silicon-aluminum.

In modern engineering, casting aluminum-silicon alloys of the type AK12M2MgN, AK12MMgN GOST 2685-75, ALZOSH TU 48-5-234-83, obtained on the basis of electrothermal silicon-aluminum are widely used.

The technology of producing these alloys involves the fusion of electrothermal silicon-aluminum with electrolysis aluminum, diluting it to a silicon content of 11.7–13% (before eutectic), filtering the diluted alloy, preparing a master alloy containing copper, nickel, etc., melting the master alloy with the filtrate and casting the finished alloy.

The aim of the invention is to improve the absorption of alloying metals and improve the properties of alloys.

The invention is that you

the silicon-aluminum of the eutectic composition is melted, copper and / or nickel in the form of an alloy with zinc are introduced into the silicon-aluminum melt at 900-1400 ° C and alloyed with aluminum. An alloy of copper and / or nickel with zinc is introduced in an amount of 0.001-0.25 by weight of the silicon-aluminum melt.

The introduction of doping into hypereutectic silicon-aluminum is caused by that.

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that this allows uniformly distributing 35 IST 006, tests were carried out on the method of producing alloys. Hypereutectic silicon-aluminum composition, wt.%: Silicon 38.6; iron 2.1; titanium 0.42; Zirconium 0.23j aluminum else, melted and heated to 900-1400 ° C, were introduced into the melt Cu-Zn and / or Cu-Ni-Zn alloys, diluted with aluminum, filtered and prepared alloys of the grades AK12M2 and AK12M2MGN.

Data on the stages of production of alloys and their properties are given in the table to separate them over the entire mass of metal in subsequent processing. Zinc introduced into silicon-aluminum at 900-1400 ° C is partially sublimated, which ensures the removal of dissolved gases. The presence of copper, nickel, and zinc in a dilute alloy reduces the melting eutectic melting point, which ensures the filtration of the melt at 600–610 ° C and increases the yield of tall at a sufficiently low content

1400 ° C

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The loss of doping with filter traps is insignificant, since they do not form intermetallic clusters at the filtration temperature.

A decrease in the temperature of the hypoeutectic silicoaluminium of less than 900 C can lead to the formation of an insoluble precipitate of doping metals, and, consequently, to a loss of m.

Temperature increase more

It is impractical due to possible metal emissions from the dissolution of Cu-Zn and Cu-Ni-Zn alloys, which is accompanied by heat generation.

The amount of added additives in the range of 0.001-0.25 by weight of the melt provides refining from the gas. With an increase in the input alloying of more than 0.25 by weight of the melt, the loss of alloying in the form of sediment increases. Reducing the amount of additives less than 0.001 does not have a noticeable effect on the improvement of the technological process of refining and does not improve the performance properties of the alloy.

Due to the fact that the properties of copper-zinc and copper-nickel-zinc alloys are equivalent and they are interchangeable, it is possible to use them both together and separately.

Example. On induction furnace

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1250

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Table continuation

Content of gases, 100 g 0.28 0.25 0.08 0.05 0.10 0.12 0.10 0.12 0.12

Mastering of alloying,% 90.1 90.5 97.3 98.6 98.7 7.8 98.1 98.4 98.6

Strength, kgf / mm 12.8 16.1 19.8 19.7 20.1 10.8 21.1 20.8 20.5

Alloy hardness

HB104 100 115 120 120 115 120 120 120

Thus, the use of the method of production of alloys makes it possible to use secondary copper-nickel-zinc and copper-zinc alloys, to eliminate the operation of preparing a ligature, to increase the absorption of alloying materials by 6-7% (abs) while reducing the gas saturation of the alloys by 2-3 times , which provides a decrease in mechanical properties.

F o rmula of the invention

Claims (1)

1. The method of obtaining aluminum-silicon alloys, including the continuation of the table melting of the hypoeutectic silicon-alumina, melting it with aluminum and introducing copper and / or nickel into the melt, characterized in that, in order to improve the properties of the alloys by turning the absorption of alloying metals, copper and / or nickel are introduced into the hypereutectic silicon-aluminum at 900-1400 C in the form of an alloy with zinc. 2, the method according to claim 1, characterized in that the alloy of copper and / or nickel is introduced in an amount of 0.001-0.25 by weight of the melt of the silicon-aluminum.