DE1017506B - Process for reducing the maximum required pressing pressure during extrusion molding of pyrophoric alloys made of mischmetal-iron - Google Patents

Description

GERMAN

The production of flints from pyrophoric cerium (mischmetal) -iron alloys with 4.5 to 40% Fe by extrusion requires high press pressures between 5000 and 16000 kg / cm ² at press temperatures between 400 and 500 °.

The high compression pressures are to be regarded as disadvantageous for the process. They require a high one Tool wear. To compensate for this disadvantage, it has already been proposed by Special alloy additives to the base alloy from cerium (mischmetal) - iron a reduction of the pressing to strive for pressure. For example, in German Patent 940 096, a method for reducing the Pressing pressure disclosed by adding such elements, their molar heat of formation, based on 1 gram atom of oxygen is at least 110 kcal. The elements Ca, Mg, Be, Ba, Al, Zr and Ti. These elements should be in amounts of 0.3 to 10%, but preferably 0.6 up to 1%, can be added in order to achieve the most beneficial effect.

It has now been found that this technical progress can still be improved considerably if the specified elements are combined with small amounts of copper between 0.05 and 0.45%>. In The table shows the extent to which this is possible using the example of the combined additives magnesium and Copper. By comparing the experiments 468 a and 472 it can be seen that the pressure of the binary Cerium (mischmetal) iron alloy decreases very considerably by adding 2.1VoMg. The experiments 473 to 475 illustrate the idea of the invention, according to which by adding small Copper content a very significant further reduction

Tabel

cerium Composition of Mg Cu O tH
O ®
oo .5? bo 45 5100 (Mixed Alloy in% ο .rf S 3 3900 attempt metal) S, 2.3 a 40 3050 No. - - 2650 80.6 Fe 2.1 - £ -1.2 ° 1650 50 78.5 2.1 0.1 78.49 2.0 0.19 78.51 19.4 2.0 0.31 468a 78.49 19.4 472 19.4 473 19.3 474 19.2 475

Procedure for reduction

the maximum required pressure

in extrusion molding

of pyrophoric alloys

made of mischmetal-iron

Addition to patent 940 096

Applicant:

Th. Goldschmidt A.-G.,
Essen, Heilermannstr. 15th

Dr. Walter Bungardt, Essen-Bredeney,
has been named as the inventor

generation of the pressing pressure is achieved. Copper contents above 0.45% are forbidden, because then the extrudability the cerium (mischmetal) iron alloys with 2% Mg and 0.45% Cu by partial liquefaction of the Starting cast block is lost, as has already been pointed out in German Patent 891 824.

The addition of copper also has a similar effect, as can be seen in the table Cerium (mischmetal) iron alloys, which in the sense of patent 940 096 contain the elements Ca, Be, Ba, Al, Zr and Ti can be added. Even in these cases there is a considerable economic improvement in the To achieve process by lowering the required pressure.

Claims (1)

PATENT CLAIM: Method for reducing the maximum required pressure in the extrusion deformation of pyrophoric mixed metal-iron alloys with an iron content of 4.5 to 40% Patent 940 069, characterized by the addition of copper in amounts of 0.05 to 0.45%. Considered publications:
Austrian Chem. Zeitung, 40 (1937), p. 302.