DE2052818B - Additive for liquid cast iron for the production of spheroidal graphite cast iron - Google Patents

Description

50-85 "... powdered magnesium, ^'8ü0 f \ already an admixture of Basu

10-15 "» powdered phenolic resin, Y. ° ", ^ ¹ " ¹¹ * ¹ µm and Ferrosiliz.ummagncs.um

5-10 · /. liquid phenolic resin as a binder, ^for » ^USSI f ^{s G} _K ^{uisseisen Ζ} " ^Γ , ^Ε ™ Brille, s _t n

The remainder is calcium carbide, cryolite and hexa- ^{ao m} . ¹¹ spheroidal graphite has been proposed, be. which one

Chlorethanes ^{in the form of small} particles used substances calcium silicon and ferrosil'tium magnesium

3. Additive according to claim 2, characterized in that the powdered magnesium consists of 2 to 20 facial percent calcium chloride, a grain size of 10 ⁰ O below 75 microns, 50 ⁰ O 85 and / or the chloride of an element of the rare 75 to 400 micron and 40 ° «400 to 750 micron earths and 2 to 20 percent by weight of magnesium, chloride andor one or more specially

4. Additive according to claim 3, characterized in that said alkaline earth metal halides or salts of a Seik that the liquid synthetic resin consists of a ten-earth.

Molecular proportion of formaldehyde to phenol of 30 In addition to the fact that here the substances 2.5 to 3.1 and formaldehyde to urea of 2 of the coating agent in a complex chemical reaction 1 and the proportion of the powdery functions to the reaction of the magnesium part of the fer-synthetic resin 10 to 12 ⁰ O is. rosi ' ^: ziummagnesiums must contribute and that too

follow relatively confusing conditions with regard to-35 borrowed the mode of action of magnesium itself

hen. is the production of the individually coated ferrous

silicon-magnesium particles with these coating materials are relatively complicated and expensive.

The invention is based on the object of providing

The invention relates to an additive for liquid substitutes for liquid cast iron for the production of ges cast iron for the production of cast iron with ball-graphite cast iron, which in gel graphite made of powdered magnesium and by far the easiest way to produce a homogeneous distribution Solids, the magnesium and the solids having a magnesium content and the magnesium in substances mixed with a liquid binder, the mi-form of metallic magnesium gently and without Schung formed into a shaped body and these 45 impurities or other metals that are useless is cured. and are expensive and, moreover, the thermal

It is known that the treatment of the casting process contained in cast iron can be made more difficult, lamellar graphite is introduced into the cast iron melt by treating the molten metal,
liquid iron with the help of small amounts of Ma- To solve this problem, an additional

convert magnesium into spheroidal graphite, whereby the 50 means of the type mentioned according to the invention properties of cast iron considerably improved training provided that one of the solids powdered. The difficulties lie in the fact that the synthetic resin and the binder are a bit flammable, compared to the synthetic resin that can be hardened at 250 + 20 ° C.
Molten iron has significantly lighter magnesium in an inventive additive compared to molten iron. 55 most of the additives known to date for

From the German patent application S 21937 production of cast iron with spheroidal graphite the pre-18bl / 02 an additive is already known that it does not contain any other metals that are necessary for the the, in which for this reason finely divided Ma- Production of the desired cast iron useless and Magnesium in the solid state with are also expensive and also often in not full divided, specifically heavier substances mixed and 60 visibly as impurities their own is pressed into a shaped body, with preferred shafts of the cast iron to be produced another binder in doughy or liquid rivers. It also allows the use Shape is used to evenly distribute a powdered synthetic resin along with Development of the magnesium particles in the heavy metal powder in a liquid, curable synthetic resin improve. Not only does this necessarily prepare a uniform distribution of the powdery agile pre-pressing of the powder mixture some magnesium in the resulting after hardening Difficulties, but it arises with the molded bodies, for which the powdered magnesium turned to Binding agents (water glass) in connection next mixed with the powdery synthetic resin

and only then the liquid binder is

is mixed.
A particularly advantageous additive results

in a further development of the invention in that it

in relation to the non-hardened state, consists of:

SO-SS '/. Powdered magnesium, 10-15% phenolic resin in powder form, 5-10% liquid phenolic resin as a hindrance, Remainder calcium carbide, cryolite and hexachloride

ethane.

To be particularly advantageous, it has been found here that the powdered magnesium having a grain size of 10 microns Vo under 75, 50 to 75 Vo 400Mikron and 40 »0 400 to 750Mikron.

The liquid resin can thereby further development of the ^Erf: invention a molecular portion formaldehyde to phenol from 2.5 to 3.1, and I have orrnaldehyd to urea of from 2 to i, while the proportion of the powdery resin 10 to 12 · /. loading

For producing a shaped body * from an inventive admixtures, the powdered magnesium and the other solid raw materials are first mixed with the liquid resin is then added to the powdered resin and mix until practically complete homogeneous - a A ^ rr, roman forming a shaped body , dead. Ouch. the mixture «well wännekammer

SärSafiigsss-

Sock The iSity of the reaction of magnesium

S = S powdery Kunslslcffs and the r, u _S -according to the invention are shown in the figures of Ze ₁ Ch

jSLSlbem «and with Mg the Magne _S , un, kome,

are designated.

1 sheet of drawings

Claims (2)

with the compression of the magnesium powder with patent claims: a heavy metal powder no uniform coating, so that the effective 1. Additive for liquid cast iron to melt the released magnesium in the casting process of spheroidal graphite cast iron from powdered iron not fine enough and uniform enough may be dispensed with volatile magnesium and other solids. fen, where the magnesium and the solids with Aus der Deutschen AuslegerTChrift 1 508 174 is mixed with a liquid binder, the mixture also an additive for inoculation treatment formed into a shaped body and this has become known from cast iron, in which.-in hardens, characterized in io vaccine (especially ferrosilicon) in a therdass one of the solids is embedded in powdered synthetic wax that decomposes without leaving any residue resin and the binder is on after mixing. In the case of a molded body made from such a Zu-250 Is curable resin at ± 20 ° C. The substitute, however, is uniform dispersion 2. Additive according to claim 1, characterized in that the vaccine is in the wax or a physical one indicates that it is very difficult to achieve on the uncured 15 similar substance. Zusiand bezo-in, consists of: Finally, through the German interpretative script