US965485A - Article of manufacture. - Google Patents

Description

Unrtrnn STATES rarnn'r onrrcn.

GUSTAV PISTOR AND PAUL RAKOWIGZ, OF GRIESHEIM, GERMANY, ASSIGNOBS TO GHEMISGHE FABRIK GRIESHEIM ELECTRON, OF FRANKFORT-ON-THEMAIN; GER- MANY, A CORPORATION OF GERMANY.

ARTICLE MANUFACTURE.

No Drawing.

To all whom it may concern: I

Be it known that we, GUSTAV PISTOR and PAUL RAKoWIcz, Subjects of the German Emperor, and residing at Griesheim-on-the- Main, Germany, have invented certain new and useful Improvements in Articles of Manufacture, of which the following is a specification.

This invention relates 'to improvements in metal articles designed for use in the manufacture of machines and apparatus, in constructions, and broadly in the mechanical industry, in which lightness, tenacity, relative extension, elasticity, capability of being worked and resistance to influences of the atmosphere are ofimportance. The subject-matter of the invention combines the aforesaid properties which are of importance in the mechanical industries in a degree which was not attained in articles of any character heretofore in use. It has been discovered that articles of the aforesaid properties can be produced from high percentage magnesium alloys which contain from 80%.

to 99.5% of magnesium and from 0.5'to 20% of foreign metal or metals apart from themagnesium. The hi h percentage magnesium alloys can readi y be worked by means of any tool either byhand or by machine. They can be soldered, welded and forged. Casts made from the said high percentage alloys of magnesium are perfect in every respect. With a fresh polish they have a beautiful color resembling that of the silver and a good luster. As to atmospheric influences they have about the same resistance as tin or' copper. A thin layer of magnesium oxid thoroughly protects the metal against any deeper attack. By condensing processes, such for example as pressing, rolling, drawing, etc;, and also by thermic improving processes to which the metal is subjected, the properties, and particularly the tenacity, relative extension, and elasticity, are considerably improved, without materially increasing the specific gravity of the same.

Heretofore high percentage alloys of magnesium with lead, zinc and thallium have been used in pyrotechnics, as has been described in Brannt, Metallic Alloys, Henry Garey Baird & (10., Pennsylvania, 1896, page 35, lines 1 to 6. This however is immaterial as far as the present invention is concerned, whichrelates to articles of the mechanical Specification of Letters Patent.

Patented July26, 1910.

Application filed April 12, 1969. Serial No. 489,476.

industry, which have nothing to do with pyrotechnical purposes, and which involve an important progress in the art by reason of their newly discovered properties.

The properties of the articles which form the subject-matter of this invention can be modified by the quality and the quantity of the metal or metals to be alloyed with the' magnesium. For example, if great importance be attached to a low specific gravity, additions upto 20 per cent. of light metals such as calcium, or aluminium, can be used thereby improving the excellent physical properties of the magnesium. Thus, for instance, an alloy of 92 per cent. of magnesium and 8 per cent. of aluminium possesses a specific gravity of only 1.75, a strength and extensibility which are equal to those of the best gun-metal. Improvement in the physical properties of the magnesium is also obtained by the addition of heavier "metals. Thus alloys of magnesium and zinc, and magnesium and copper, produced with due regard to the aforesaid percentage limits are greatly superior. in their physical properties to the usual aluminium or its alloys. The.

applications of the said high percentage magnesium alloys are Very extensive on account of the aforenamed properties, especially their unusually small specific gravity, great density, tensile strength and toughness, giving great reduction in Wei ht and cost. They will be of great value' or many purposes in the whole mechanical industry; especially for instance for automobiles, and apparatus used in aeronautics, and navigation, and for military and sporting purposes, and generally for machinery, instruments, mountings, electric apparatiis and fine mechanical work and even for jewelry, and for bell making. The use of magnesium 1n the metal industry has hitherto been limlted'to its application as de-oxidizing agent and as a metal purifyin agent in foundries. In the latter cases t e magnesium rema ns in the resulting metals, or alloys, only in a very small proportion. An application of magnesium in the mechanical industry has been in making We claim:

1. An article of manufacture capable of resisting mechanical stresses and sultable to be used in the mechanical industry, consisting of an alloy containing not less than 80% and not more than 99.5% of magnesium.

An article of manufacture ca able of reslsting mechanical stresses and suitable to 'be used in the mechanical industry, consisting of an alloy containing not less than 80% and not more than99.5% of magnesium, and

not more than 20% or less than 0.5% of aluminum.

In testimony whereof we have signed our names to this specification in the presence of 15 two subscribing witnesses.

GUSTAV PI STOR. PAUL RAKOWIGZ.

Witnesses FRANZ HAPsLAcnnR, ERWIN DlPPEL.