US1293117A

US1293117A - Production of metallic tungsten.

Info

Publication number: US1293117A
Application number: US179934A
Authority: US
Inventors: Frederick G Keyes
Original assignee: Cooper Hewitt Electric Co
Current assignee: General Electric Vapor Lamp Co
Priority date: 1914-02-11
Filing date: 1917-09-11
Publication date: 1919-02-04
Anticipated expiration: 1936-02-04

Description

FREDERICK G. KEYES, 0F CAMBRIDGE, MASSACHUSETTS, ASSIGNOR TO COOPER HEWITT ELECTRIC COMPANY, OF HOBOKEN, NEW JERSEY, A CORPORATION OF NEW J ERSEY.

PRODUCTION OF METALLIC TUNGSTEN.

Specification of Letters Patent.

Patented Feb. 4, 1919.

No Drawing. Original application filed February 11,1914, Serial No. 818,008. Divided and this application filed July 11, 1917.

T 0 all whom it may concern:

Be it known that I, FREDERICK G. Knms, a citizen of the United States, and resident of Cambridge, county of Middlesex, State of Massachusetts, have invented certain new and useful Improvements in the Production of Metallic Tungsten, of which the following is a specification.

The present method of obtaining metallic tungsten consists in adding to tungsten trioxid (W0 a suitable binding material, and then reducing in an atmosphere of hydrogen at a high temperature. The ingot thus produced consists of metallic tungsten cemented together by a binding material and the next step in the'process is that of subjecting the ingot to a swagin process which is also carried out at a hig temperature. The swaging is continued until the ingot is reduced to a diameter that permits of its being drawn while hot through suitable dies until the desired sizes are obtained. The binding material is so selected as to toughen the resulting wire. 7 It is a disadvantage appertaining to this process that the dies are lubricated with graphite. It is a matter of common knowled e that tungsten has a great avidity for car on, whereas it would be an advantage to prevent, if possible, any cementation. This is done in the above mentioned method of obtaining tungsten and the result is that the tungsten wire used in tungsten lamps is in reality not a pure metal, but a mixture,

chemical or otherwise, of binding material Serial No. 179,934.

used, or, preferab y it may in the early stages of the drawing be drawn through dies of a special tungsten-iron-carbon alloy. Such alloys are already known in the arts and tools made ofit hold their edge at a red heat. The pure tungsten havmg, as

stated, a superior quality of ductility when obtained by my process may be drawn through these special dies, thus avoiding the expensive dlamond dies. As a lubricatin material powdered talcum may be substituted for the deleterious graphite.

This application is a division of my application Serial Number 818,008, filed February 11th, 1914.

I claim as my invention:

1. The method of obtaining pure metallic tungsten which consists in forming a solution of tungsten in boric acid and electrolyzing the solution thus formed.

2. The method of obtaining pure metallic tungsten which consists in dissolving tungsten in boric acid at approximately 1200 to 1400 C. and electrolyzing the solution thus formed.

3. The method of obtaining tungsten, which consists in forming a solution of tungsten compound in an ionizing medium and electrolyzing the solution thus formed.

4. The method of obtaining tungsten, which consists in dissolving tungsten compound in an ionizing medium at approximately 1200 to 1400 centigrade and electrolyzing the solution thus formed.

Signed at Cambridge, in the county of Middlesex and State of Massachusetts, this 9th day of July, A. D. 1917.

' FREDERICK c. KEYEs.

Witnesses:

ALTER HUMPHREYS, Wrrmmrvr daemon.