SU986948A1 - Flux for treating aluminium alloys - Google Patents

Description

C5) FLUX FOR PROCESSING ALOMINUM ALLOYS

one

The invention relates to the metallurgy of non-ferrous alloys and can be used in the foundry industry for the treatment of aluminum alloys with the use of their refining and modifying salt fluxes.

Known for refining aluminum alloys containing, in wt%:

Sodium chloride to cryolite 10-15

. Sodium fluoride 10-20 ,, Potassium chloride Else The flux has a relatively low melting point, but when processing is aluminum melt in the slag is down to the metal, and the fluidity of the melt decreases due to the increased availability of the alloy, the whole / the effect of its saturation with sodium. 20

The closest to the invention in terms of the achieved result and technical essence is flux f 2j containing sodium chloride, sodium cryolite, potassium chloride and strontium compound - strontium fluoride in the following ratio of components, wt.%: Sodium chloride Cryolite 5-10 Strontium fluoride 20 -32 Potassium Chloride Else Flux has good modifying properties, however, when it is processed, losses of metal with slag are high.

The aim of the invention is to improve the quality of the alloyed alloy and reduce its loss with the slag.

The goal is achieved by the fact that, in a flux containing sodium chloride, sodium cryolite, potassium chloride and strontium compound, strontium nitrate is introduced into the flux as strontium compound in the following ratio of components, weight,:

Sodium Chloride 30-10

Sodium cryolite 10-15 Strontium azogate 10-20 Potassium chloride Elimination The introduction of strontium nitrate into the composition of the flux increases its refining ability and reduces the metal loss in the slag due to the formation of gaseous reagent released by the nyaMpbKqs, which adsorb hydrogen and nonmetal gases during decomposition. in molten metal. An increase in the content of strontium nitrate more than 20 increases the metal loss in the slag, since this produces significant amounts of gaseous reactant, carrying additional quantities of liquid metal into the slag film, without having a significant effect on the gas saturation and fluidity of the alloy. The low content of strontium nitrate less than 10 leads to an increase in gas saturation and the number of non-metallic inclusions 8 in the alloy. A decrease in sodium chloride below 30 reduces the fluidity and modifying ability of the flux, an increase above 40% increases the metal loss in the slag. The content of cryolite 10–15% is usually recommended, ensures easy melting of the flux on the surface of the melt, reaching 700–7 ° C, and from the table it can be seen that the use of flux provides a liquid metal of improved quality.

Claims (2)

The use of the proposed flux for the treatment of aluminum alloys makes it possible to improve the casting properties of the propellant. Increasing the content of potassium chloride by more than 50 reduces the fluidity of the alloy, reducing the content below 25 increases the metal loss in the slag. Example. The Al alloy is melted in a crucible electric resistance furnace with a capacity of 30 kg according to the charge of the composition, kg: A-7 primary aluminum GOST 11069-7 3.75; Simulin CyL 1 GOST 1521-68 13.5; Mg Mg 90 GOST 0.08; manganese Mr 2 GOST 6008-75 0.46; return of own production of Al4 the rest. Pre-alloy refined Degazer tablets in an amount of 0.1 by weight of the melt. The treatment of the alloy with the fluxes of the composition shown in the table is carried out at 730-7 ° C in an amount of 1% by weight of the melt by introducing a bell into the metal volume. Min. Processing time After removal from the surface of the molten slag, samples for fluidity and gas saturation are filled. Fluxes are prepared by thoroughly mixing the components previously dried at 200250С. The obtained technological properties of the alloy and the metal content in the slag after the flux treatment of the corresponding composition is given in the table. tallow (fluidity) with a significant reduction in metal loss in the slag. In this case, a low degree of gas saturation of the alloy is achieved; (0-1 gas porosity point). The flux can be used for volumetric refining and modifying alloys in transfer and induction melting furnaces. The economic effect from the use of the invention is 40.2 thousand rubles. in year. Claims of the invention Flux for the treatment of aluminum alloys containing sodium chloride. sodium cryolite, potassium chloride and g jS. Strontium compound, characterized in that, in order to improve the quality of the alloyed alloy and reduce its loss in slag, the strontium flux compound contains strontium nitrate in the following ratio of components, wt.%: sodium chloride) Sodium cryolite 10-15 Nitric acid. strontium 10-20 Potassium chloride Else Sources of information taken into account during the examination 1. USSR author's certificate No., cl. From 22 to 9/10, 1973. 2. USSR author's certificate number 572512, cl. C 22 V E / S, 1976