JPS63171890A - Production of alloy foil - Google Patents

Abstract

PURPOSE:To easily produce alloy foil, by preparing an electrolytic bath contg. ions which deposit as a metal by electrolysis, suspending fine powder of an insoluble metal in the bath, depositing thin foil on the cathode and alloying it by heating after stripping. CONSTITUTION:An electrolytic bath contg. ions of a metal such as Cu, Fe, Ni, Zn, Sn, Pb, Co or Cr capable of depositing on the cathode by electrolysis is prepd. and fine powder of a metal or alloy which does not dissolve in the bath is suspended in the bath. The particle size of the fine powder is <=2mum. The resulting electrolytic bath is electrolyzed to form a thin film of a deposited metal contg. the suspended powdery metal on the surface of a rotating drum made of Ti or Ta having superior releasability as the cathode. The thin film is stripped from the drum and heated to a high temp. in vacuum or in an atmosphere of an inert gas such as Ar or N2 to alloy the deposited metal with the suspended metal by counter diffusion. Thus, alloy foil is stably produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing an alloy foil that can be stably performed through relatively simple steps and is therefore advantageous in terms of cost.

[Conventional technology]

Some alloy foils have properties such as strength, corrosion resistance, heat resistance, and magnetic properties that cannot be obtained with pure metal foils, and their uses are being developed in recent years.

Conventionally, methods for producing such alloy foils include a rolling method and an electrolytic method. The rolling method is a method in which an alloy ingot is made into a hot coil through blooming and hot rolling, and then cold rolling and annealing are repeated to roll it to a predetermined thickness.
Recently, it has become possible to manufacture products up to about 5. However, in addition to the economic problems of extremely low productivity and yield and high cost, this rolling method also has a fundamentally serious problem that it cannot be applied to alloys that are difficult to roll. Ta. on the other hand.

The electrolytic method is a method in which alloy foil is continuously manufactured by electrodepositing an alloy onto the rotating drum surface in an electrolytic solution containing ions of alloy components using a metal rotating drum as a cathode, and then sequentially peeling it off. This method has the advantage that thin alloy foils can be obtained at once, and currently iron-nickel, iron-nickel-cobalt, iron-chromium, and other alloy foils are manufactured using this method. However, this electrolytic method requires that the deposition potentials of two or more metal ions to be deposited as an alloy be equal over a certain range of practical current densities, and for this reason, the types of alloy foils that can be manufactured are considerably limited. There was a serious problem.

[Means for solving problems]

The present inventors solved the problems of the prior art described above.

The purpose of this study was to provide a method that is relatively simple, can be carried out stably, is cost-effective, and can produce alloy foils with a wide range of combinations of two or more metals. Result 1: The present invention has been achieved.

That is, the present invention suspends a fine powder of an insoluble metal in an electrolytic bath containing metal ions that are precipitated as a metal by electrolysis, and performs electrolysis to remove the fine powder of the insoluble metal along with the precipitated metal. Manufacture of an alloy foil characterized in that the metal foil obtained by adhering to an electrode is peeled from the electrode, and then the metal foil is subjected to heat treatment to mutually diffuse the praying metal and the insoluble metal to form an alloy. It is about the method.

[Explanation of configuration]

The present invention will be explained in detail below.

Metals that can be deposited on the cathode by electrolysis from the electrolytic bath containing metal ions include copper, iron, nickel, zinc, tin, lead, and cobalt.

There is chromium etc. In addition, such metals may include known alloys that can be electroplated.The electrolytic bath for depositing these metals or alloys used in the present invention may consist only of these metals or alloys. A known electrolytic bath for manufacturing metal foil by electrolytic method can be used. The metal components contained in such an electrolytic bath are used as the metal components of the target alloy foil, and pure metals or alloys that are insoluble in the electrolytic bath (hereinafter referred to as insoluble metals) are used as the metal components that are insufficient. Add fine powder and suspend in the bath. As a fine powder of insoluble metal,
Fine powders of pure metals or alloys that do not dissolve in the electrolytic bath of the metal to be deposited by electrolysis and are stable in the atmosphere are sufficient.The smaller the particle size, the better the particles will be dispersed in the bath, and the finer particles of pure metals or alloys with relatively high specific gravity can be used. It is preferable because even alloy powder does not sink easily. 0Usually,
Use particles with a particle size of 27j or less. This is because if the particle size exceeds 2p, the amount of insoluble metal deposited on the cathode together with the precipitated metal during electrolysis will vary greatly and will not be uniformly dispersed in the plating layer. There is no need to set a lower limit for the particle size, and particles up to particle size 1p are currently readily available.

An unalloyed metal foil is first prepared according to a known electrolytic method using an electrolytic solution to which fine powder of an insoluble metal is added as described above. i.e. titanium, for example.

When this rotating drum is rotated while performing electrolysis while supplying the above-mentioned electrolytic solution between the electrodes using a rotating drum whose circumferential surface is formed of at least a peelable metal such as tantalum as a cathode, the electrolytic solution is deposited by electrolysis. Fine powder of insoluble metal adheres to the surface of the drum along with the precipitated metal to form a metal foil, and this metal foil is continuously peeled off and wound onto a winding core.Next, the precipitated metal thus obtained is A metal foil in which fine powder of pure metal or alloy is dispersed in a matrix is heat-treated, preferably in an inert atmosphere such as argon, nitrogen, or vacuum, to diffuse the metals and form an alloy. The heat treatment conditions such as temperature for 2 hours and the type of atmosphere can be determined according to known techniques depending on the target alloy.

〔effect〕

The method of the present invention involves suspending a fine powder of an insoluble metal in an electrolytic bath for producing alloy foil by an electrolytic method, and performing electrolysis to deposit the fine powder of an insoluble metal on an electrode together with the precipitated metal. By adopting a structure in which the foil is heat-treated and alloyed after being peeled from the electrode, it is possible to apply the electrolytic method to alloys and combinations of alloy components that cannot be applied by the rolling method due to the difficult rolling method. As for alloys that do not show through, these alloy foils can be produced in a relatively simple process and cost-effectively.

〔Example〕

A rotating tantalum drum was used as the cathode, and a tantalum electrode whose surface was plated with platinum was used as the anode. Ferrous chloride (Fe(u, ・nH, O) 600 g/
Fine powder of 90% Cr-10% Ni alloy (average particle size 24) was added at a concentration of 50 g/Q to an electrolytic bath mainly composed of Q, and the suspension was heated to 100°C. While feeding, electrolysis is carried out at a current density of 30 to 50 A#d, and the metal foil formed on the rotating drum is continuously peeled off from the rotating drum and wound up to a thickness of 35 mm containing 15% by weight of the fine powder of the above alloy.
-2 A coil of metal foil having a plate width of 200 cm was obtained.Then, this metal foil was heat treated at 1100 DEG C. for 6 hours in an argon atmosphere. When the cross section of the obtained alloy foil was analyzed using an electron beam microanalyzer (EPMA), it was found that Fe-13% by weight C
It was a substantially homogeneous alloy foil containing r-2% by weight Ni.

Claims (1)

[Scope of Claims] 1. A fine powder of an insoluble metal that is insoluble in the electrolytic bath is suspended in an electrolytic bath containing metal ions to be deposited as a metal by electrolysis, and the fine powder of the insoluble metal is removed together with the precipitated metal. An alloy foil characterized in that after a metal foil obtained by adhering powder onto an electrode is peeled from the electrode, the metal foil is subjected to heat treatment to mutually diffuse the praying metal and the insoluble metal to form an alloy. manufacturing method. 2. The method for producing an alloy foil according to claim 1, wherein a pure metal is used as the insoluble metal. 3. The method for producing alloy foil according to claim 1, wherein an alloy is used as the insoluble metal. 4. The method for manufacturing an alloy foil according to any one of claims 1 to 3, wherein the insoluble metal fine powder has a particle size of 2 μm or less. 5. The method for producing an alloy foil according to any one of claims 1 to 4, wherein the heat treatment to be applied to the alloy foil is performed in an inert atmosphere.