JPS6217142A - Manufacture of aluminum-lithium alloy - Google Patents

Abstract

PURPOSE:To manufacture an Al-Li alloy in which occurrence of fine cracking is inhibited by pouring Li into an Al vessel in an inert gaseous atmosphere, sealing the above, adding the resulting Al-coated Li pieces into molten Al in the air to undergo melting and carrying out alloying. CONSTITUTION:A fixing quantity of molten Li 2 is poured in the inert gaseous atmosphere into the Al vessel 1 divided by partition frames 6 into plural compartments so as to be solidified by cooling and then an Al cover 3 is welded to the open end of the above Al vessel 1 so as to be sealed by sticking. Subsequently, the above-mentioned sealed Al vessel 1 is heated to about 400-500 deg.C and rolled to be formed into a rolled plate of about 5-8mm thick, which is cut at the cutting positions 4 in the near center of the partition frames 6 into Al-coated Li pieces. After that, the above Al-coated Li pieces are added in the air into the molten Al and melted, so that the Al-Li alloy in which occurrence of fine cracking is inhibited and which is free of inclusions such as Li2O, Li2CO3, etc., can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an aluminum-lithium alloy that suppresses the occurrence of fine cracks.

The conventional method for producing aluminum-lithium alloys is to melt aluminum in a refractory crucible containing alumina, then
In order to avoid a separate reaction with the outside air, oil-soaked lithium pieces are melted into aluminum, and the atmosphere during melting is generally one in which an antioxidizing gas, such as non-sulfur gas, is blown onto the surface of the molten metal. there were.

This method is easy to handle because the entire process is carried out in the atmosphere, but it is not possible to completely cut off contact between lithium and the atmosphere, and lithium oxide is generated with interspersed compounds such as lithium carbonate. These products tend to cause minute cracks as base points or bases, which has been a problem in their application as structural materials.

The present invention eliminates the above-mentioned drawbacks. First, lithium is melted in a pure iron crucible in an inert gas atmosphere, and then a certain weight of molten lithium is placed in an aluminum container 1 shown in FIG. 2 is injected, and then cooled and solidified. Next, cover the lithium with an aluminum lid 3 and weld or braze the contacting end of the lid and the container to insulate the lithium from the outside air. After welding or brazing, the aluminum container filled with lithium was taken out into the atmosphere and
After heating at 00° C. for 1 to 2 hours, it is rolled. Thickness 5
After rolling to ~8 mm, it is cut at the frame portion as shown at 4 and 5 in FIG.

Next, separately, aluminum is melted in an alumina or other refractory crucible in the atmosphere, and the pieces of the small aluminum container containing lithium are inserted little by little until the appropriate amount is reached, and the mixture is stirred and melted to obtain the desired aluminum and lithium. Manufacture alloys.

In the present invention, in dissolving lithium into aluminum,
This makes it possible to perform the melting process in the atmosphere without the need for large-scale atmosphere conditioning equipment and without the lithium coming into contact with the atmosphere.Furthermore, it does not generate intervening axes of lithium oxide or lithium carbonate during melting. It is possible to produce an aluminum-lithium alloy that suppresses the occurrence of minute cracks based on the base point or pattern.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a lithium-filled aluminum container according to the present invention. FIG. 2 is a front view of the container 1... Aluminum container 2... Lithium 3...
Aluminum lid 4, 5...Cut surface after rolling

Claims (1)

[Claims] A certain amount of molten lithium is poured into an aluminum container, cooled and solidified, and then covered with an aluminum lid,
Weld or braze the connecting end of the lid and container to insulate the lithium from the outside air. A small aluminum container filled with lithium is created by rolling a container filled with lithium in the atmosphere, cutting it at the rear frame, and inserting this into molten aluminum, stirring and melting it to form an alloy. Manufacturing method