SU1293240A1 - Inoculant of hypereutectic silumins - Google Patents

Abstract

The invention relates to the field of non-ferrous metallurgy and can be used to modify hypoeutectic silumins. The purpose of the invention is to increase the mechanical properties of silumin, to reduce harmful HbJX emissions during modification, and to simplify the modifier preparation technology. A mixture (20-60 wt.%) And AfjOj (40-80 wt.%) Is used for the modification. The use of P.S. significantly reduces the amount of harmful emissions, and slows down the decomposition of sulfide. 1 tab. with S (L. 00 ND

Description

eleven

The invention relates to the metallurgy of non-ferrous metals and alloys, in particular to the foundry industry and can be used to modify the hypereutectic silumins.

The purpose of the invention is to increase the mechanical properties of silumin, to reduce harmful emissions when processing a melt of hypereutectic silumin and to simplify the modifier preparation technology.

The invention consists in the fact that the modifier contains 20-60 wt.% Phosphorus sulfide of composition P Sj and 40- 80 wt.% Alumina,

Modification of primary silicon in hypereutectic silamins, processing

This modifier is due to the presence of phosphorus in its composition, and to increase the dispersion of the structure, the modifier contains sulfur and alumina is added.

The use for the modification of phosphorus sulfide P, S significantly reduces the amount of harmful emissions, as compared with the modifier-poMj, which contains elemental sulfur and phosphorus. This occurs not only due to the exclusion of the modifier hexa-chloroethane, but also due to the fact that phosphorus and sulfur are transferred to the melt

Magnitude

supplements

Strength at stretching, MPa (numerator), and relative elongation,% (denominated (ø)

during the decomposition of the chemical compound P.S., which occurs in the mass of the melt itself without access to oxygen from the air. When phosphorus sulphide is introduced into the melt, the decomposition of the melt occurs, which leads to the release of the zinc metal. In order to slow down the decomposition reaction of phosphorus sulphide and refine the alloy structure, alumina is introduced into the modifier.

Example, For the preparation of a modifier, three mixtures containing various amounts of the initial constituents were made of the components. The prepared modifier was introduced, wrapped in aluminum # 1 foil, with the help of a steel bell into an aluminum alloy with 15% silicon in an amount of 0.05; o, i; 0.3; 0.5 and about, 7% of

alloy weight.

To evaluate the modifying ability of the proposed modifier, the melt was also treated with a known modifier containing phosphorus 5 sulfur, hexachloroethane and aluminum powder.

The average values of the mechanical properties of the samples of the studied alloy treated with various additives are listed in the table.

176.6 2.42

173.3 2.45

ABOUT,

0.3

207.9 3.51

209.4 3.63

229.7

4.12

213.2 4.05

As can be seen from the table, when using the proposed modifier containing phosphorus sulphide P / j S and alumina, both studied mechanical properties of aluminum alloy with 15% silicon are higher than the properties of samples of the similar alloy treated with a known modifier, and the optimal addition of the proposed modifier is 0.3% by weight of the alloy.

In addition to improving the mechanical properties, the proposed modifier compared to the known modifier reduces the consumption of modifiers and simplifies the technology for preparing the modifier due to the absence of the need to prepare press grids and a decrease in the number of components; it does not contain any chlorinating components, which is about 7 times less

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Editor A.Dolinich

Compiled by V. Badovsky

Tehred L. Serdyukova Corrector I. Erdeyi

350/29

Circulation 605 Subscription

VNII1Sh State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5

Production and printing company, Uzhgorod, st. Project, 4

Spreadsheet

25

reduces the amount of harmful emissions into the atmosphere of the shop.

Claims (1)

Invention Formula  The modifier of hypereutectic silumins, containing phosphorus and sulfur, is characterized in that it additionally contains alumina to improve the mechanical properties of -silins, reduce harmful emissions and simplify the technology for producing the modifier, and phosphorus sulfide P | Sj with the following ratio of components, May. %: Phosphorus Sulfide 40 Aluminum oxide 20-60 40-80