US898638A - Process of casting copper and copper alloys. - Google Patents

Description

- Specific aiticuriof l'ietteirs i iatentr E PMI ET amat- Greet n fnofinss ast a wer gg g Mi I 'raeentease e. 15, 1908.

' iipplioationfiled i' rn 27 mos.- s im no. 314,086.

To all who'trt 'it my concern: I

Be it known that I, CONRAJi' GAursoH,

citizen of Germany, reslding at Munich, Bavaria, Germany, have invented certain new and useful Improvementsin) Processes for Casting Copper andCo per Alloys; andJI-do hereby declare the fo lowing to. be a full, clear, and exact description of the invention, such as will enable others skilled in the art to In casting copper; or coppertalloys, the

presence of. oxid of [cop er tends {to prevent the attainment of a er ectly eyen structure of the casting. Bot copper and its alloys remain honeycombed to a certain extent.-

For the same reason it has hitherto been im'- possible to add copper or its. alloys to iron or.

steel in very large quantities or at least in ter metals eater hardness or strength of resistance, t an that of the ordinary alloys. Q

In order to enable the addition of iron and the like, the assistance of othenmetals such as zinc aluminium or nickel has beenrequisitioned, which actto a certain extent as carriers for the iron. c

According to the resent invention bicarbonate fnf soda is ad ed to the co per, which renders itpossible to add the d sired mixtures in much greater quantities, particularly to steel, the alloy as also the pure copper being entirely free from porosity and metal alloys beingobtained (bronzes) which possess exceptional powers of resistance against wear and mechanical influences.

1- Although it is known to add hydrates and alkalies to copper, this has hitherto always been effected simultaneously with an energetic feed of oxygen and exclusively for the purpose of freeing the copper from foreign metals and more particular y arsenic.

Thus the present process consists in adding to the metal-copper or mixtures of co 45 per, tin, old metal and iron steel or t e 'ke besides the usual .gaddition ,of phosphorus (which as is known tends to reduce the copper oxid formed) a" suitable quantity of bicarbonate of soda, without any special oxygen feed, a part being advantageously added right at the commencement and a which it appertains to'*mal e and; use the closer-to that of molten copper t substances heretofore employed, the said such large quantities, as to impart to the lat-- ,part after the metal has been melted. The

amount of bicarbonate of soda added may be from one to two fifths er cent. i

, The result of the ad ition of the bicarbonate-of soda is to render the uality of the molten metal much thinner, t at is to say -m'o're fluid, or less viscous, so thatit will homogeneouslp take u the mixtures of steel or other meta s adde in very considerable quantities, thus producing alloys having eX-; ceptional hardness and of a density.hitherto unsurpassed. v

' The effect of the addition of bicarbonateof soda, as far as the same could be observed in the melting process appears to be that the same melts at a temperature approaching an do the bicarbonate decomposing to form carbonate of soda and carbonic acid and causing the mass to foam, so that a art from the intimate mixture of the mo ten metal, the oxide and protoxidsfof co per are dissolved and thus ass out of the mo ten mass into the slag. T is'eflect of the bicarbonate of soda in dissolving the oxid is proved bythe presence of considerable quantities of oxid and protoxid of copper in the slag floating on the cast metal. The particular advantage of bicarbonate of soda in the present case is'that it does not easily melt and that conse uently its activity is developed just when t e copper and other metals begin to melt. v

. I claim as my invention: v

1. In the process of casting copper and copper alloys, the ste which consists in adding to the metal bicarhonate of soda, substantially in the absence of free carbon.

2. In the process of casting copper and cop er alloys, the step which consists in adding icarbonate of soda to the metal, then 95 melting the latter and then adding more bicarbonate of soda.

3,111 the process of casting copper and copper alloys, the step which consists in adding during the melting process from one to two-fifths percent. ,of bicarbonate of soda.

4. In the process of casting copper the step which consists in adding bicarbonate of In testimony whereof I hereunto affix my 4 sodium tohmolten puref copper. h signature in the presence of two witnesses,

5. In t e process 'o casting 00 per t e i ste which consists in adding bicar onz te of v CONRAD GAUTSGH' 5 so( ium to ure cogper, then melting the lat- Witnesses;

ter, and t en ad mg more bicarbonate of i ULYssEs J. BYWATER,

sodium to the molten copper. I LOUIS F. MUELLER.