SU981411A1 - Flux for processing aluminium alloys - Google Patents

Description

() FLUX FOR PROCESSING ALUMINUM ALLOYS

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The invention relates to the metallurgy of non-ferrous metals and can be used in the foundry industry for the processing of aluminum alloys.

Known refining-modifying flux for the treatment of aluminum alloys, containing, by weight: hexachloroethane 18-23; potassium hexafluorosilicate 5-10; cryolite k-j; potassium hexafluorotitanate 20-26; potassium tetrafluoroborate 18-23; aluminum powder 7.5-10; potassium chloride 9-12; sodium chloride 5-8.

In terms of the composition and content of the components, this flux is intended for the simultaneous scanning of the modifying treatment of aluminum wrought alloys, which are mainly cii-solid undersaturated alumina solutions with a reduced eutectic content. Their effective modification is achieved due to the effect on the alloy of titanium and boron containing salts, which are included in the composition of the indicated flux in an increased amount (about 0-50%), and comminute the grain solution. In addition, the grinding of the Q-solution crystal grain is facilitated by the introduction of aluminum powder into the composition of the flux 7, which is an activator of the modification process in aluminum

Q alloys l.

However, the flux does not have a long modifying effect due to the insignificant content of sodium and potassium chlorides, and the absence of sodium fluoride does not allow it to be considered an effective modifier for aluminum cast alloys, resulting in a fine-grained eutectic structure.

20 The closest to the proposed technical essence is the flux for the treatment of aluminum alloys based on sodium and potassium chlorides and fluorides, which include hexafluorine calcium, hydroxylene chloride, calcium, and hexahloroethane. Due to the transition to oac: pl 1 in nat-and potassium, titanium, boron, the tax flux has a diminutive modifying effect, and the presence of hexachloroethane contributes to the deglaging of the junction, j2. However, the effect of modi fi cation using the indicated compo- sition does not exceed the C – 0 ratio due to: 3 o: - the proper degree of assimilation of titanium and boron and rapid sodium carbon monoxide. The goal of isophosphorus is to maximize the duration of the 11 n. ;; ly;: - micro effect. Set goal / joc i i i irotct (.. R.; That is in the composition of the flux for OPRA () casting, -p mini-alloys, containing; C, C; Chl;. Sodium, chloride, 1; a1: W, f. sodium, potassium hexafluorotitanag, potassium tetrafluoroborate,: eiccaxju ethane, additionally: potassium fluorosilicate and sodium i: ;; i: i lit with the following cooTr-iOiije U4i components, wt.i-i: Sodium chloride Potassium chloride Fluoride sodium Hexafluoride and sodium at potassium Tetrafluor () orat potassium Sodium cryolite Hexafluorosilicdt potassium Hexachloroethane Introduction of hexafluorozig; u1.) cal .: in the composition of the flux in the amount of 6 (.mc-v 0.5% by increases the activity of nat;: IL and exchange reactions, which is about 1 °;); s – to: the interaction of fluoride with sodium chloride, reduces the melting point. When the content of step 3 occurs, the absorption of the natris alloy reduces its plasticity. Cryo lit. reduces the oxidation of n;) modifies and reduces the waste of nari and potassium, which have Mc ,. | i; iii.iruyuschee action. In addition, the 1m-, sd :: cryolite in the amount of 5 ops 5, along with the improvement of the flux flux index, due to the formation of a superficial glossy film / n, increases the digestibility of the guitar and Go;) i, which leads to take | | to; And: P dlits -...nest modifying. The use of potassium fluorosilicate and coiolite reduces the consumption of scarce and expensive components, Decreasing ;;: h-atri below Wi .-; KCi y -iec g n of the flux. 1nC-Is: fc1iJC; - :.): .rg) dit to non-eons KJMy H-; and: llG. O ng; triem alloy / xy P,;: hr-hra rasp pawe by-; 1yr1. i oxides and water. i i iOKf.: we remove azus1STOST 11. .: 1L) And ;. i С; :; CLEAR 3 YOU: - .. T o - :, H O, C, H: .- 1 VAST 1 s,.;. ;; yy of the avant Fleu:; i :: --- a; u alus iC iOBIjLlJCM i;.; jB iijie; -i Oe COpo; L:; h; t loss:; h1 h) B) film. -le -CHi-e f -11os. ::. ;.: ХХ СЧЛОЗв. : -m / 1U Constant ne ;; .kit-yu 2500 kg: soy rasa, kg: v-7V-Ab-5,8- :. 105; Oiss OST) P08-75-MRG-0, 3 2,6; m1-m I OS 532 -68-C-l -23,8 ,. k) sglc; at coaxial r; o ;;; skzvodstSST / GB3-73.-i remaining. Alloy; a;.; M t ;.: l jHc -11l; -; ru: o: rel aratom. j, 33 fxjTKy spl; ..; for g: L ;; themselves constituting one tl per section; Chis-KLT U.; - c g 1.1 weight. backfire598

by introducing into the volume of the metal using a measuring bell at 7207 G ° C.

Processing time 10 min. After discharging technological wedge samples from the surface of the slag melt, the samples are chilled onto mechanical tests, which determine the duration of the modifying effect and gas saturation.

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A mixture of each composition is prepared by thoroughly mixing the pre-dried components. The results of the refining-modifying treatment of the alloy with a flux of the appropriate composition are given in the table. Degree and duration:, the modifier of the modification is estimated by the fracture of the technological sample, the microstructure of the cast alloy AL and the level of mechanical properties in accordance with GOST-2685-7

The table shows that the use of the proposed universal flux in comparison with the known ones makes it possible to achieve a long-term modifying

general effect (2-3 times more than when processing known fluxes).

Cast aluminum-silicon alloy treated with this flux has a typical modified macro and microstructure. The use of the proposed flux for treating aluminum alloys maintains a high level of the casting properties of a metal, the fluidity at low gas saturation (0-1 point on the BMAMJ scale. The mechanical properties of the alloy after standing in the transfer furnace for more than 1.5 hours, treated with the proposed flux, are: of,

26.9 kg / mm, g 5, U; IV 85 kg / mm without flux treatment - (j "

20.3 kg / mm; B 2.5%; IV 72 kg / mm. The universal flux of the developed composition can be used for degassing, refining and modifying alloys in the dispensing and smelting furnaces, either as a loose mixture of components or as compressed tablets.

The expected economic effect from the use of the invention is thousands of rubles.

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about about -J- .lS a. } I-tr 1 claims for fluxing aluminum alloys containing sodium chloride, potassium chloride, sodium fluoride, potassium hexafluorotitanate, potassium tetrafluoroborate, hexachloroethane, in order to increase the duration of the modifying effect, it additionally contains sodium cryolite and hexafluoryl or potassium in the following ratio, components, weightL: Sodium chloride 35,, 0 Potassium chloride 8.0-10.0 Sodium fluoride 20.0-30.0 5 O pr CL 55 Cl 10 Potassium hexafluorotitanate 3.0-7.0 Tetrafluoroborate Kali LZ - +. About Sodium Cryolite 5.0–10.0 Potassium hexafluorosilicate 0.5–5.0 Hexachloroethane Else Information sources taken into account in the examination 1. PnP NR 77698, 0 V 21/04, published. 1976. 2. Patent of Great Britain No. 963230, C 7 D, published. 19bA.

Claims (2)

Claim A flux for processing aluminum alloys containing sodium chloride, potassium chloride, sodium fluoride, potassium hexafluorotitanate, potassium tetrafluoroborate, hexachloroethane, characterized in that, in order to increase the duration of the eff Potassium hexafluorotitanate Potassium tetrafluoroborate 5 Sodium cryolite Potassium hexafluorosilicate Hexachloroethane 3.0-7.0 1.5-4.0 5.0-10.0 0.5-5.0 The rest of the modification effect, it additionally contains sodium cryolite 10 Sources of information, and potassium hexafluorosilicate, when taken into account when examining the ratio of components, wt.%: Sodium Chloride Potassium Chloride 35.0-45.0 8.0-10.0 Sodium fluoride 20.0-30.0 1. Patent NDP No. 77698, cl. 40 B 21/04, published. 1976. 2. UK patent No. 963230, CL C 7 D, published. 1964.