US1703577A - Heinrich falkenbebg - Google Patents

Description

Patented Feb. 26, 1929.

UNITED STATES l @FFlQE.

HEINRICH FALKEIZ'EEEG, OF VJEE'EZEN, NEAR HANOVER, GERMANY.

TUNGSTEN ALLQY.

No Drawing.

other r2 ther readily melting and oxidizable metals. tteinpts have been made to overcome these difficulties by the addition of a certain amount of iron, but the results were not entirely satisfactory. Now, it is the object of my invention to produce a perfectly homogeneous and nonseparating alloy of tungsten, particularly with l ad, zinc and the like which is particularly adaptable for journal bearings and as a material for ammunition, such as infantry balls, shot and the like.

The invention is based on the fact that the tungsten metal is incorporated with a comparative excess of a readily melting metal which though oxidizable at high temperature, possesses great resistibility under ordinary conditions; and of these lead and zinc have been found to be specially suitable for the purposes of this invention. In order to manufacture a tungsten alloy according to this invention, one may proceed as follows l. of metallic tungsten-p0 der is fused in a crucible with 49.5% of an alloy of lead and antimony consisting of 20 parts antimony and 80 parts lead with the addition of 0.5% of iron or less.

This mixture may be further diluted by fusing it with additional quantities of the same lead-antimony alloy, and preferably at such proportions that for each 7 kilogrs. of the alloy of tungsten-lead-antimony-andiron 2 kilogrs. of the lead-antimony-alloy are employed. If this dilution should not be sufficient, further quantities of the diluent may be added.

11. The thus diluted alloy is then fused with 13% tin and 18% antimony, 1.8% copper and 67.2% lead. By this means the entire amount of the tungsten becomes united with the lead, so as to form a perfectly homogeneous alloy.

HI. Instead of the alloying with a mixture of tin, antimony, copper, lead and iron, as set forth under I and II, a mixture of zinc, lead and iron may be used for the Application filed December 2, 1925, Serial No. 72,815, and in Great Britain December 8, 1924.

- I and I] Tungsten 0.02 to 3 Lead u 47 to 80 Antimony 15.5 to 25 tlopperuu" 0.7 to 10 Tin 0.5 to 25 l and [If Tungsten 0.02 to 3 Iron 1 to 5 Copper 1 to 2 Aluminium 1 to 3 Zinc 86 to 96 Lead 2 to 5 Variations and modifications of these percentages and constituents are admissible to a certain extent within the scope and spirit of the invention, as defined by the appended claims.

I claimv 1. The method of producing a tungsten alloy, which consists in melting metallic tungsten with ap iiroxii'nately an equal amount of an alloy of lead and antimony in the presence of small. amounts of iron, diluting the mixture by the addition of further amounts of lead-antimony-alloy and fusing the resulting mixture with a mixture of metals containing lead and a metal of a higher melting point than lead.

2. The method of producing a tungsten alloy, which consists in melting metallic tungsten with approximately an equal amount of an alloy of lead and antimony in the presence of small amounts of iron, diluting the mixture by the addition of. further amounts of lead-antimony-alloy and fusing the resulting mixture with an alloy containing lead in excess, tin and antimony and small quantities of copper.

8. The method of producing a tungsten alloy, which consists in melting metallic tungsten with approximately an equal amount of an alloy of lead and antimony in the presence of small amounts of iron, diluting the mixture by further addition of leaclanti1nony-alloy and fusing the resulting mixture with a compound containing lead, Zinc and iron.

4. The method of producing a tungsten alloy, which consists in melting metallic tungsten With approximately an equal amount of an alloy of about eighty percent of lead and about twenty percent cit antiniony in the presence of small amounts of iron, treating the n'iixture with further addition of lead-antimonyelloy and fusing the resulting mixture with a con'ipoluuil containing large amounts of an excess of Zinc With smaller quantities of iron and lead.

5. The method oil producing a tturgsten alloy, which consists in melting metallic tungsten with approximately an equal 11110111151 01 a mixture of lead and antimony in the presence of small amounts of iron, then treating the mixture with further additions of lead-antimony-miXture and tusing the resulting product with a compound containing lead, zinc and small (maturities of copper and aluminium.

6. The method of producing a tungstencontaining alloy, which consists in treating and meltin a tungsten-lead-antimony-alloy with further quantities of lead and antimony, thereby greatly reducing the amount of tungsten in the resulting product, and then combining said product With a metallic base, containing lead and iron and a large excess of Zinc.

7. A metallic alloy, con'iprising a metallic base which contains mainly lead and zinc with small additions of iron and copper, each averaging from a minimum of about one percent up to maximum of about five percent, and, from about two hundredths of one percent up to about three percent of metallic tiimgsten.

8. As a new proouct an alloy, contaiuing from about two hundredths out one percent up to about three percent of tungsten, the bulk of the lalance being composed of from about 86 to about 96 percent of zinc, with small quantities of about 2 to 5 percent of lead, about 1 to 5 percent of iron, from about 1 to 2 percent of copper, 1 to about 3 percent of aluminium, and about two hundredths to about 3 percent of antimony.

HEINRICH FALKENBERG.