US1774816A

US1774816A - Crucible for aluminothermic reactions

Info

Publication number: US1774816A
Application number: US380747A
Authority: US
Inventors: Schultz Hermann
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-08-31
Filing date: 1929-07-24
Publication date: 1930-09-02
Anticipated expiration: 1947-09-02

Description

Se t.,2, 1930. H. SCHULTZ CRUCIBLE FOR ALUMINOTHERMIC REACTIONS Filed July 24, 1929 :NVENTOR BY HIS ATTORNEY Patented Sept. 2, 1930 UNITED STATES PATENT mm v HEBMANN SCHULTZ, OF .BERLIN-LANKWITZ, GERMANY ,GBU'GIIBLE FOB ALUMINOTHERMIC REACTIONS Application filed lly 24, 1929, Serial No.

like on the one hand, and the all metal or castiron crucible on the other.

The invention is illustrated in the accompanying drawings, in which v Fig. 1 is an elevation of .a crucible embodying the invention, and

Rig. 2 is a half section of the same on line 22 of Fig. 1. p

In carrying out alumino-thermic reactions, more particularly in effecting welds by superheated alumino-thermic steel or iron, two types of crucibles have been employed, one comprising a shell ofsheet iron or the like with a thick lining of refractory clay or similar plastic material and the other consisting of a thick walled receptacle of metal, preferably cast iron. Orucibles in which the lining consists entirely of refractory clays or the like are open to the objection that they are subject to rapid erosion due to the action of the slag upon the refractory walls. This difiiculty is obviated by using a crucible made entirely of thick walls of cast iron which is not attacked by the slag and the surfaces of which, when coated with .slag, are protected from the intense heat generated in the molten metal by the alumino-thermic reaction. These cast iron crucibles however are unduly heavy and cumbersome. The present invention is designed to avoid the ob]ectionable features of both of the old types of crucibles and to utilize the salient advantages of each. To this end, the invention comprises a crucible having a lower section of refractory molded material, preferably en-' closed in a sheet metal casing, and an upper section formed of a cast metal-annulus, with suitable connecting means between the sections to form the same into a unitary structure.

Referring to the drawings, a indicates a sheet metal shell or casing, which is provided with a lining b in the form of a thick wall of plastic refractory material, such as the 880,747, and in Germany August 31,1928.

various clays and compositions used for this purpose, these two elements constituting the bottom member or section of the crucible. As indicated, the general shape of the crucible isthat of a frustum of a cone, the lower portion terminating in a pouring gate fitted with the usual renewable nipple e. Secured to the upper edge of the sheet metal shell or are spaced lugs d I The upper section of the crucible, indicated at c, is formed as a metal annulus, pref- 1 erably of cast iron, shaped to constitute an extension of the body of the crucible, the lower edge of the annulus fitting the upper edge of the refractory lining b and the annulus being provided with lugs d corresponding to the lugs d of the lower section and adapted to receive bolts 7, by means of which thetwo sections are locked together.

It will thus be seen that the composite crucible includes alower section, which will contain practically all of the metal resulting from the alumino-thermic reaction, which lower section includes the refractory lining which is not attacked by the molten metal, and an upper metal section with which the slag comes in contact-and which is protected from the heat of the reaction by the slag, the result being a crucible capable of much more extensive use and with a greatly lessened tendency toward deterioration and injury because of the fact that the refractory wall of the lower section lies below the body of the molten slag during the reaction and the metal walls of the upper section are protected from the superheat of the reaction by the slag.

What I claim is:

1. A crucible for alumino-thermic reactions comprising a lower section with a thick wall of molded refractory material, an upper section of metal, and means for connectmg said sections.

2. A crucible for alumino-thermic reactions comprising a lower section with a thick wall of molded refractory material, an upper section of cast iron, and means for connect ing said sections.

3. A crucible for alumino-thermic reactions comprising a lower section with a thick wall of molded refractory material, a sheet metal shell surrounding said lower section, v an upper section of metal, and means for connectmg the shell to the metal section. 5 4. A crucible for alumino-thermic reactions compnsmga-lower sheet metal shell, a

lining therefor of refracto material, an upper section of cast iron, an lugs on the shell and upper section for securing said elements together.

5. A crucible for alumino-thermic reac-' tions comprising a frusto-conical-sheet metal shell, a lining therefor of refractory material, an upper annular section of cast iron, registering with and forming a continuation of the body of the crucible, and perforated lugs on the shell and annular section for connectingthe parts together.

In testimony whereof I aflix my signature.

9-0 HERMANN SCHULTZ.