JPH01290753A - Production of amorphous alloy-coated metallic material - Google Patents

Abstract

PURPOSE:To efficiently coat the surface of a metallic material with an amorphous alloy with good adhesion by locally melting only the surface part of the metallic material traveling at high speed, injecting a molten alloy onto the molten part, and immediately dipping the material in a refrigerant. CONSTITUTION:A coating alloy 13 is melted in a crucible 12 having a nozzle, the molten alloy 13 is injected upward onto the surface of the metallic material 11 moving at high speed from a nozzle, and the surface is uniformly coated. At this time, the surface part 17 of the material 11 is irradiated with a laser beam or an electron beam 16 immediately before the application of the molten alloy 13 to locally melt only the surface part 17, and the molten alloy 13 is injected onto the part. The material 11 coated with the molten alloy 13 is dipped in the refrigerant 14 to quench and solidify the molten metal, and the material 11 is coated with an amorphous alloy 15. The material 11 and the amorphous alloy coating layer 15 are metallurgically bonded, and the adhesion is improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for continuously coating metal wires, metal plates, etc. with an amorphous alloy having excellent properties such as high strength, high hardness, and high corrosion resistance. It is related to.

[Prior art] Amorphous alloys, which have various excellent properties, are suitable as coating materials for surface modification because they can be easily obtained as thin strips. There is a risk that the properties of the amorphous alloy will be lost due to crystallization due to heat during the process. Furthermore, for example, when coating a metal wire or the like, a winding process is required, so in any case there are problems in terms of cost and mass production. On the other hand, plating methods and sputtering methods have also been attempted as methods for directly coating amorphous alloys, but these methods tend to cause defects such as pinholes and are not preferred as, for example, corrosion-resistant surface treatment methods. Furthermore, these direct coating methods are unsuitable for mass production and have problems in terms of cost and mass productivity.

Therefore, we first thought of coating the surface of the steel wire and making it amorphous at the same time, and filed an application as Japanese Patent Application No. 62-256384 for a method for efficiently manufacturing a high-performance amorphous alloy coated N steel wire. A conceptual diagram of this method is shown in FIG. The alloy 7 melted in the crucible 2 is sprayed onto the surface of the steel wire 1 from a donut-shaped nozzle 3 to coat the steel wire 1. 4 is a heater.

5 is a heat insulating material for preventing the temperature of the steel wire 1 from rising.

The steel wire 1 onto which the molten alloy 7 has been sprayed is immersed in the coolant 6. The molten alloy 7 is rapidly solidified by heat dissipation to the steel wire 1 and heat dissipation to the refrigerant by being immersed in the refrigerant 6, and becomes an amorphous alloy 8. These two heat dissipation processes are combined to increase ultra-quenching efficiency. The heat dissipation process of the molten alloy to the steel wire is similar to the heat dissipation process in the roll quenching method, and heat is dissipated to a metal with excellent heat transfer efficiency.If the steel wire is thick and has a large heat capacity, the coating thickness is about 100 μm. It is possible to make it amorphous. In addition, the heat dissipation process to the refrigerant is similar to the submerged spinning method,
Its heat dissipation efficiency depends on the surface area. In the conventional submerged spinning method, it is necessary to rapidly cool the entire system, so the wire diameter that can be made amorphous is up to about 150 μm, but in this method, it is the molten alloy coated on the surface that requires cooling. Therefore, it is possible to make the wire amorphous regardless of the wire diameter. The steel wire is kept at almost room temperature during this process, but the coated amorphous alloy shrinks due to the temperature difference between the solidification temperature and room temperature, and is tightly coated on the steel wire surface, causing the formation of an amorphous alloy and this. Coating of the steel wire is realized at the same time. This method allows the steel wire to be processed continuously, making it possible to produce an amorphous alloy-coated steel wire extremely efficiently. This method can also be applied to steel plates and the like through the steps shown in FIG. That is, the amorphous alloy can be coated by spraying the molten alloy onto the surface of the steel plate 9 moving at high speed and immersing the steel plate in a coolant.

[Problem to be solved by the invention] However, with this method, depending on the wire diameter and the critical cooling rate for amorphousization of the molten alloy, crystallization may occur during the heat dissipation process to the metal, and the excellent properties of the amorphous alloy cannot be fully utilized. There were times when I was unable to perform to my full potential. Further, since the metal surface and the coating layer are not metallurgically bonded, they may easily peel off if cracks or the like occur in the coating thickness due to processing or impact.

The purpose of the present invention is to provide a method for manufacturing high-performance amorphous alloy-coated metal materials continuously at low cost, i.e., in large quantities, by preventing the crystallization of the coating layer and metallurgically forming the metal surface and the coating layer. The object of the present invention is to provide a method of bonding and significantly increasing the reliability of the covering material.

[Means for Solving the Problems] In order to achieve such an object, the present invention locally melts only a part of the surface of a metal material moving at high speed, and sprays a molten alloy to cover the melted part. After that, the metal material is coated with the amorphous alloy by immediately immersing it in a refrigerant.

[Function] Fig. 1 shows a conceptual diagram of the present invention. In order to evenly apply the molten alloy to the metal material 11 such as a metal wire or a metal plate,
The alloy is melted in a crucible 12 having a nozzle, and the molten alloy 13 is applied from the nozzle of the crucible 12 to the surface of the metal material 11, which is moving at high speed from a high-speed feeding device (not shown) in the upper part of the figure to a high-speed winding device (not shown) in the lower part of the figure. Spray it evenly and spread it on the surface of the metal material. At this time, the molten alloy is spouted upward to form a pool in the air, and the metal material is passed through the pool. Metal material 11 coated with this molten alloy 13
is immersed in coolant 14 and rapidly solidified to obtain a metal material coated with amorphous alloy 15. The above is the basic manufacturing method, but furthermore, in the present invention, just before applying the molten alloy, only the surface portion 17 of the metal material 11 is locally melted using a laser or electron beam 16, and the molten alloy is jetted onto that portion. By coating, crystallization of the applied molten alloy is prevented, and metallurgical bonding between the metal material 11 and the coating layer formed by solidification of the applied molten alloy is achieved. In the present invention, the applied molten alloy 13 and the locally melted portions on the surfaces of the metal material 11 are rapidly solidified by heat radiation to the metal material and heat radiation to the refrigerant by immersion in the refrigerant. By combining these two heat dissipation processes, we can increase the ultra-quenching efficiency and control the thickness of the coating layer depending on the moving speed of the metal material, making it possible to form an amorphous alloy coating layer of an appropriate thickness with a wider range of alloy compositions. Therefore, the excellent properties of the amorphous alloy can be maximized. In addition, by moving the metal material at high speed, the ultra-quenching efficiency is increased, and the above steps are performed continuously and at high speed, making it possible to mass produce products.

[Example code] The present invention will be explained in detail below.

Embodiment 1 FIG. 2 is a diagram illustrating an embodiment of the present invention, with 21
22 is a 3 mmφ steel wire to be coated; 22 is a laser beam irradiation device for locally melting only the surface of the metal material 21;
23 is a crucible with a nozzle 23A for melting the alloy to be coated and spraying the molten alloy, and 24 is water as a coolant. Coating treatment was performed in an inert gas atmosphere to prevent oxidation of the molten alloy.

The steel wire 21 is passed through a high-speed feeding device 25 and a high-speed winding device 26
The surface of the steel wire 21 moving at a speed of 20 m/s from the top to the bottom of the figure is locally melted by the beam emitted from the laser beam irradiation device 22, and immediately after that, the steel wire 21 is melted at the same time. In order to apply the molten alloy evenly, the composition Fe,
5St. 815 alloy was melted and jet coated. The steel wire 21 coated with this molten alloy 27 was immersed in cooling water 24. Ultra-rapid solidification was achieved through the above steps, and the molten alloy became amorphous, making it possible to obtain a steel wire coated with about 50 μm of amorphous alloy 28. I'e75silOa+5
Tensile strength is 330 ~ due to coating with amorphous alloy
380 kg/mm2, and the elongation at break was also improved to 2 to 4%.

The tensile strength of the steel wire used was 300 kg/mm2. The elongation at break is 2%.

Example 2 Amorphous alloy coated steel wires were produced using the manufacturing method of Example 1 by changing the steel wire moving speed to obtain steel wires with different coating thicknesses. Their relationship is shown in Table 1.

When spraying molten alloy onto the surface of a steel wire moving at speed ■,
The thickness t of the obtained amorphous alloy layer is V' (n is 08 to 09
(constant of ), and ■ determines the cooling rate. In order to exhibit the excellent properties of the amorphous alloy, t may be about 10 μm, but in consideration of wear due to long-term use, it is practically desirable to obtain a 3-metal layer with a thickness of 50 to 100 μm. In order to make the molten alloy amorphous, a cooling rate of IO4/s or more is required, and for that purpose V is 5 m/s or more, and to obtain the above layer thickness, ■ is about 20 to 30 m/s. is optimal. If the moving speed is higher than this, the time during which the steel wire exists in the molten alloy becomes shorter, so the thickness t of the wire becomes smaller.

Table 1 Relationship between steel wire moving speed and coating thickness Example 3 Applying the above manufacturing method, a plurality of laser beam irradiation devices 22 and crucibles 23 with nozzles are installed in parallel in FIG.
In addition, by appropriately selecting the amorphous alloy, corrosion resistance and
It was possible to obtain a steel plate with extremely excellent wear resistance. For example, a steel plate coated with Fe45Cr25MO+oP13c7 amorphous alloy has excellent corrosion resistance, and is self-passivated and resistant to corrosion even in the extremely harsh environment of 6N hydrochloric acid at 80°C.

In addition, the Fe4oTa4ocr2o amorphous alloy NvA plate has excellent corrosion resistance and abrasion resistance, and has a rubber grinding wheel (#90
), the maximum wear depth is 17 for 5OS304.
It was 5 or less. A metal plate coated with an amorphous alloy having such excellent properties is very useful as a composite material since it can fully take advantage of each other's strengths.

[Effects of the Invention] As explained above, according to the present invention, an amorphous alloy can be efficiently and economically coated on the surface of a metal material with good adhesion, and the excellent properties of the amorphous alloy can be fully utilized. It has the advantage of being able to manufacture metal materials.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of the present invention, FIG. 2 is a schematic diagram explaining the present invention in detail, and FIGS. 3 and 4 are conceptual diagrams of the conventional method. DESCRIPTION OF SYMBOLS 1... Steel wire, 2... Crucible, 3... Donut-shaped nozzle, 4... Heater, 5... Insulating material, 6... Refrigerant, 7... Molten alloy, 8...・Amorphous alloy, 9... Steel plate, II... Metal material, 12... Crucible, 13... Molten alloy, 14... Refrigerant, 15... Amorphous alloy coating layer, 6... Laser or electron beam, 17... Melting surface, 21... Steel wire, 22... Laser beam irradiation device, 24... Coolant, 25... High speed feeding device, 26... High-speed winding device, 27... Molten alloy, 28... Amorphous alloy layer. Patent applicant Nippon Telegraph and Telephone Corporation

Claims (1)

[Claims] 1) Locally melt only a part of the surface of a metal material moving at high speed, spray and apply the molten alloy to cover the melted part, and then immediately immerse the metal material in a coolant to coat the metal material with an amorphous alloy. A method for producing an amorphous alloy-coated metal material characterized by coating.