IL30239A - Preparation of alloys on the basis of magnesium-zirconium - Google Patents

Description

Preparation of alloys on the basis MESSIER 28529 to alloys with base of having improved mechanical properties high The invention has also for its object of preparation of alloya of this It is well that ium the part of a agen o special in magnesium this properly is especially in French Patent of 19 the other it is also known two materials exoellent nuclear These two characteristics have made i possible to pure magnesium refined th as a sheath or can material in atomic Researches carried out by the Applicants on th mechanical characteristics of these alloys at temperatures comprised between and have shown that the properties in the hot state are improved in where the introduction of the zirconium in the binary system or more complex alloys such as is made wit reducible salts of This introduction of zirconium by means of chemical compounds lias alread been in the case of potassium fluozircon or zirconium in particular in British Patent of February 19th In order to reduce the risk of explosion during the reduction of the potassium numerous authors have furthermore described the utilization of agents particular potassium which leads to a reaction hou explosion Patent of May 22nd this preparation the use of the Applicants have endeavoured to obtain this improvement of the echanical properties in the hot without at the time utilise reducible salts of which are frequently difficul to handle than of in which the zirconium is in metallic Tests carried out by the Applicants have made possible to establish that the introduction of the zirconium in the metallic state results in properties in the hot which are substantially identical with those obtained by introduction from provided that the the is completed by a treatment with potassium in particular with potassium potassium fluozirconate constituting only one particular case of this family of as the utilization of a flux with high content of salt does not exclude of the fluxes for purifying the oxide and prevent oxidation of the the total quantity of the two types of flux liable to form an inert mass at the bottom the crucible containing the molten this mass adversely affects the operations of preparation and to absorb a substantial part of the molten which considerably Increases the losses for melting In a mass of liable to contaminate the alloy thus carried out by the Applicant have t at is possible to avoid these serious drawbacks by utilising one or more fluxes in vihich potassium salts represent at least by weight and preferably between 0 and of the salts introduced the bath of molten In the invention has for its object a of preparation of alloys with a base of according to which the zirconium Introduced into the alloys in the form of a of in the presence of a flux a high content of potassium especially of potassium chloride associated so desired with other alkali or this method being characterized in that the potassium salts represent at least and preferably between 70 and by weight o the salts introduced into the bath of molten According to an important feature of the the potassium salts mus preferably represent between 7 and of the weight the molten and the purifying flux should be 2 to of the weight of the molten If the flux of potassium comprises different for example a mixture of potassium chloride and potassium the relative proportions of the different salts may have absolutely any oh condition that the whole of the potassium salts represents at least by weight of the salts introduced into the It is however clear that due to the high cost of potassium potassium chloride preferably It noted that under a stress of fracture takes place at 7 minutes in first minutes in the second 17 minutes in the third improvement in behaviour under heat due to the preparation by Zr accompanied by a treatment vdth salts is thus particularly This effect is again found in the temperature range of to vnich that of the operation of It is observed in this that the limit under tension is also improved in a very substantial manner by pre vdth the completed by a treatment dth potassium An example of application is given below in the case of the mixture of KF and KC1 containing of This mixture is previously prepared by the introduction KF into molten The produot is then poured into an ingot mould and subsequently treatment by otaseiun 3alts is for example at and produces the results The curves of show the elements and indicate the results obtained with of salts ofi Barium The conditions of the tests the same insufficientOCRQuality

Claims (1)

1. Allo s with a base of conlu re are insufficientOCRQuality