SU624947A1 - Flux for melting and refining of magnesium alloys - Google Patents

Description

(54) FLUX FOR MELTING AND REFINING MAGNESIUM ALLOYS

The invention relates to non-ferrous metallurgy, it can be used in the refining of magnesium and its alloys with fluxes.

Fluxes are known for smelting and refining magnesium alloys Iji containing metal fluorides, boron oxide and borax, with the following ratio of components, wt. %:

B20a 30-60; NaaARPb 25-4O} CotP2. 0-S ABPg 20-27 or V2S g. 40-70; WOaAZFg 25-40; 7-ll; . 3-6; CaP, 45-55; AE P 12-28; 15-20; Co tz 15-20.

The flux has low protective properties, and the resulting alloys have low mechanical characteristics.

The closest to the proposed flux is the known flux | 2, soda {1) potassium fluorocirconate, chattrefluoride, zirconium fluoride and a bivalent metal fluoride in the following ratio of components, weight. %:

Ftorzyrkvnata Kali 70-88

Four fluorofluoric oyrconium, 1О-20 Vink2-10 fluoride

The flux of obaseaech vadt increase the shielding properties of abaggeable alloys, but the mechanical properties of the produced products from the flux-treated alloys is not enough ...

The goal of ionization is to increase the mechanical properties of magnesium alloy products and reduce the cost of flux. This goal is achieved using magnesium fluoride as a bivalent metal fluoride at the following ratio of components, weight. %:

Chevyfreftoris ty

zirconium 10-20

Fluoride magnesium 10-20

Fluorocirconate

Kali Else.

Preparation of the flux consists of sieving its components through a sieve with cell sizes of 0.4-0.6 mm, metering and mechanical stirring. Laboratory tests in the smelting of magnesium alloys (ML 12 and ML 5) were carried out in crucibles with a capacity of 3-5 liters in the following order: the melting of the charge under the flux being tested; heating the melt to the technologically necessary temperature (720-780 C); standing of the melt under the flux for 10–15 min or more (depending on the need)} bringing the melt temperature to the temperature of pouring it over the forms. Example. 33.4, 2 KiZ, tiPi, K ZZAZ t Y4 sifted through a sieve, mechanically stirred for 30 minutes. Get the flux of the following composition, weight. %: fA6 16 ,. , 7. Magnesium melted in the crucible, the ML-12 alloy is sprinkled with flux, they are raised (hours up to 720 Siv for 1 O min maintain gphy to this temperature. The flux easily spreads over the metal mirror. The melt temperature increases.

Alloy

Prototype Prototype

Claims (2)

ML 5 ML 12 Proposed ML 5 ML 12 Claims of the invention Flux for melting and refining magnesium alloys, containing potassium fluorozirconate, cyan tetrafluoride {divonia and bivalent metal fluoride, about l and h ay. in order to increase the mechanical properties of magnesium alloy products and reduce the cost of the flux, it contains magnesium fluoride as a divalent metal fluoride at the following ratio of components, weight. %: 6 Mechanical properties H SU, kg / mmI S,% 6.8 23.5 26.0 9.5 7 Shut up. Sunbathing is not observed. The crusting flux is easily separated from the melt. Similarly, the fluxes of the following composition are prepared and tested on ML 5 and ML-12 alloys, weight. %: 20} KaZrT 60; g; kg 4; MtfPi 10; K22t-r 7Q; 2: f r4 20; 70; ZKK lO. As a result of processing, the products obtained from alloys have improved mechanical properties in comparison with products made from alloys produced using the flux adopted as a prototype. Data on the mechanical properties of the alloys are given in the table. Replacing fluoride and nca with magnesium fluoride improves the flux refining capacity, i.e. to improve the cleaning of the melt from solid non-metallic inclusions (oxides and nitrides). Due to the higher cost of magnesium fluoride (6 rubles / kg versus 10 rubles / kg zinc fluoride), the flux is more economical. 25,68,2 27,310,4 Zirconium tetrafluoride 1О-20 Magnesium fluoride 10-20 Fluorozirconate potassium Else Sources of information taken into account during the examination: 1. Author's certificate of the USSR 114256, cl. From 22 to 9/10, 1953., 2. USSR author's certificate for application N92026314 / 02, cl. From 22 to 9/10, .05.74.