JPS624842A - Production of magnesium-lithium alloy for acoustic apparatus - Google Patents

Abstract

PURPOSE:To stably produce a thin Mg-Li alloy sheet having uniform quality at a good yield by melting and stirring Mg and Li in a high-frequency induction heating furnace in which an inert gaseous atmosphere is maintained then quickly cooling the molten metal with cooling rolls in the stage of producing the thin sheet of the Mg-Li alloy for acoustic apparatus. CONSTITUTION:Mg and Li have a large difference in specific gravity and therefore the thin Mg-Li alloy sheet having a uniform compsn. cannot easily be produced in the stage of producing the thin Mg-Li alloy sheet for acoustic apparatus. Therefore, a required amt. each of Mg and Li are put into a hermetic type crucible 2 made of a heat resisting steel having the high-frequency induction heating furnace 1 and after the inside of the crucible is evacuated to a vacuum by a vacuum discharge pipe 4, gaseous Ar is introduced therein through an inert gas introducing pipe 5. The Mg and Li are heated and melted in the furnace 1 and are, at the same time, stirred with a high frequency to form the molten Mg-Li alloy 3 having the uniform compsn. Such molten metal 3 is dropped from a nozzle 7 onto the cooling rolls 8 under high- speed rotation, by which the molten metal is quickly cooled. The cooled metal is taken up as the thin Mg-Li alloy sheet 9 having the uniform compsn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in the manufacturing method of a magnesium-lithium alloy for audio equipment.

[Conventional technology]

Conventionally, in order to obtain a thin plate of Mg-Li alloy, there is a large difference in specific gravity between Mg and Li. The alloy becomes separated and cannot be mixed with an alloy having a uniform composition. Furthermore, since Mg and Li are active metals, they can be sufficiently stirred and mixed in an inert gas. Therefore, it is possible to homogenize the alloy by producing it as an ingot with a rough composition as described above, weakening the activity of Li metal, repeating the process of melting and refining, and then casting it into a billet or the like. This is then rolled to obtain a Mg-Li alloy thin plate.

In this way, obtaining a thin plate of Mg--Li alloy requires complicated operations in the process, and the same process is repeated, resulting in the problem of increased loss of Mg or Li.

[Problem that the invention seeks to solve]

The present invention has been made as a result of extensive research in view of the current situation, and has developed a method for producing Mg-Li alloys for audio equipment through simple steps.

[Means for solving problems]

The method of the present invention is to simultaneously rapidly solidify Mg and Li molten metals by a molten metal quenching method to produce an Mg-Li alloy.

[Effect]

In the method of the present invention, the time required to solidify the molten metal of Mg and Ll is extremely short.
Since the molten metal mixed with Ll can be cooled as it is, a homogeneous Mg-Li alloy thin plate can be produced by one melting.

〔Example〕

As shown in Fig. 1, a melting furnace 2 made of heat-resistant steel is installed in a high-frequency melting furnace 1, and inside it, Mg300.9 and Li3
0. Insert ji'. Next, after removing the air in the tube 2 through the vacuum exhaust pipe 4, sialbone gas is introduced through the inert gas introduction tube 5. Replace the inside with inert gas. Next, the melting furnace 1 is turned on and heated, and Mg
, Li is dissolved to form a molten metal 3, and the molten metal is sufficiently stirred by high frequency. Due to this stirring action, Mg
-Ll becomes a uniform molten metal.

Note that the melting temperature at this time was 800°C.

Thereafter, by pulling up the stopper 6, the nozzle 7 is opened, so that the Mg-Li alloy molten metal 3 flows onto the cooling roll 8 which rotates as pressurized by argon gas, is rapidly cooled by the roll, and becomes a thin plate 9. . This Mg-Li alloy thin plate is wound up into a product by a winding machine 10.

E, PlM,
A (X-ray microanalyzer) was used to perform surface analysis and produce the organizational chart shown in Figure 2 (A).

In addition, in order to compare with the Mg-Li alloy obtained by the method of the present invention, the Mg-Li alloy obtained by the conventional casting method was subjected to the above-mentioned surface analysis using E, P, M, and A. The results are shown in Figure 2-0. The organizational chart shown in Figure 1 was obtained.

As is clear from Figures 2) and 0), the alloy made by the method of the present invention has a uniform structure, but the alloy made by the conventional method has a non-uniform structure with white spots (Ll distribution). It was seen everywhere.

Furthermore, when a corrosion resistance test was conducted on both alloys by leaving them in 100% humidity for one week, the alloy made by the method of the present invention showed almost no effect on temperature, but the alloy made by the conventional method showed a decrease in strength. did.

〔effect〕

As detailed above, according to the method of the present invention, Mg-
It is extremely useful industrially for producing Li alloy thin plates.

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram showing an example of the method of the present invention, Figure 2 (A) is a micrograph showing the crystal structure of the Mg-Li alloy obtained by the method of the present invention, and Figure 2 (B) is It is a micrograph showing the crystal structure of an Mg-Li alloy obtained by a conventional method. 1...□High frequency furnace, 2...melting rutz? , 3...M
g-L1 alloy molten metal, 4...exhaust pipe, 7...nozzle, 9...Mg-Ll foil, 10... winding machine. Applicant's Representative Patent Attorney Takehiko Suzue s1 Figure, x, 4QO 27B Figure 2 Procedural Amendment 1, Indication of Case Patent Application No. 143288/1988 2, Title of Invention Manufacture of magnesium-lithium alloy for audio equipment Law 3, Relationship with the amended person case Patent applicant (529) Furukawa Electric Co., Ltd. (1 person) 4.
Agent: UBE Building, 3-7-2 Kasumigaseki, Chiyoda-ku, Tokyo
00 Telephone 03 (502) 3181 (main representative)
7. Contents of amendment (1) In page 5, lines 10 to 13 of the specification, “
Figure 2 (A) is a micrograph of the Mg-Li alloy obtained by the method of the present invention, taken with an X-ray microanalyzer. Figure 2 (B) is a tissue diagram in which a surface analysis was performed using an X-ray microanalyzer for a Mg=Li alloy obtained by a conventional method.'' (2) In the drawings, Figures 2 (A) and (B) will be corrected as shown in the separate figures. 18> XS drunkenness (A>>!;t.;,;2 figure

Claims (1)

[Claims] 1. A method for producing a magnesium-lithium alloy for audio equipment, which comprises simultaneously rapidly solidifying molten magnesium and lithium by a molten metal quenching method to obtain a magnesium-lithium alloy.