US721814A - Method of producing alloys of aluminium. - Google Patents

Description

UNITED STATES PATENT OFFICE.

ANTON MANHAR DT, OF VIENNA, AUSTRIA-HUNGARY.

METHOD OF PRODUCING ALLOYS OF ALUM INIUM.

SPECIFICATION forming part of Letters Patent No. 721,814, dated March 3, 1903.

Application filed October 7, 1901. Serial No- 77,867- (No specimens.)

. in the Province of Lower Austria, in the Empire of Austria-Hungary, have invented certain new and useful Improvements in Methods of Producing Alloys of Aluminium, of which the following is a specification.

This invention has relation to a method of producing an alloy of aluminium, the product having the'advantage of increased resist ance and cheapness and also having the beantiful silver color of the aluminium, which is not altered by the influence of the airi. 6., it will not oxidize.

The new alloy consists of about one hundred parts, by weight, of aluminium; 12.05

parts, by weight, of tin; 0.20 part, by weight, .of antimony; 0.09 part, by weight, of phosphorus; 7 .50 parts, by weight, of copper; 0.06 part, by Weight, of magnesium; 0.06 part, by weight, of bicarbonate of sodium; 0.04 part, by weight, of sulfur; total, one hundred and twenty parts.

This alloy is obtained in the following manner: Tin, antimony, phosphorus, copper, and magnesium in the above-mentioned proportions are first melted, and then the aluminium is melted and added little by little. After the molten mixture is thoroughly stirred the bicarbonate of sodium and the sulfur are added and the mixture heated. The bicarbonate of sodium and sulfur have the effect that impurities which may be contained in the metals are separated in the form of slag, while the alloy remains absolutely metallic pure. 1

The alloy can be molded, is very tenacious,

, not brittle, and has invariably a silver color.

It may be worked in difierent ways and after polishing shows a luster.

By slight modifications of the proportions the working qualities may be varied. For instance, the hardness can be increased by adding a little more antimony, which also increases the brittleness, while a greater quantity of copper increases the tenacity.

What I claim, and desire to secure by Letters Patent, is-

The herein-described method of producing an alloy of aluminium which consists in first melting tin, antimony, phosphorus, copper and magnesium, then adding molten aluminium, thoroughly stirring the mixture, adding bicarbonate of sodium and sulfur, and finally heating the mixture.

In testimony whereof I affix my signature in presence of two witnesses.

ANTON MANHARDT.