JPS627847A - Hardening treatment for diffusion penetration of copper and copper alloy on surface of iron and ferrous alloy - Google Patents

Abstract

PURPOSE:To obtain desired mechanical characteristics by coating a copper-base metal on the surface of a ferrous metal and hardening the metals so that the former is diffusively penetrated into the latter. CONSTITUTION:The copper or copper alloy is coated by a plating, vapor deposition, thermal spraying or other method on the surface of a product or part consisting of the iron and ferrous alloy and is hardened. The copper or copper alloy is diffusively penetrated into the surface layer of the product or part consisting of the iron and ferrous alloy to form the double-layered alloy layers. The mechanical characteristics of the above-mentioned product or part are thereby improved. An intermetallic compd. is generated and distributed between the steel and the atoms contained in the steel by controlling the time zone of the heating temp. in the diffusion penetration process of the copper. The characteristics of the steel plus the characteristics (hardness, toughness, wear resistance, brittleness or porous condition, etc.) are thus derived as desired.

Description

[Detailed description of the invention] Conventionally, the surface treatment of steel is carried out by carburizing and nitriding,
Methods have been used to obtain strength characteristics by creating a surface coating layer using plating, vapor deposition, thermal spraying, and other methods, but the strength of an integrated metal cannot be ensured, and there are many problems such as peeling and chipping, and the surface coating layer is not in perfect condition. At present, it is difficult to maintain the quality of the product.

Conventionally, copper and copper alloys have been treated as harmful impurities to iron alloys, but in the present invention, by penetrating copper and copper alloys from the outside to create a two-layer alloy layer, on the contrary, high strength properties can be achieved. This construction method ensures that

To explain the contents in detail, when steel is made by melting method,
Copper creates an unusual distribution of hardness throughout the alloy! ! It has been treated as a very harmful impurity that makes the entire A brittle.

On the other hand, if this is heated from the surface to cause intense mutual exchange of metal atoms to create an appropriate distribution of steel atoms, the embrittlement will instead produce a strengthening effect. This technique was developed to utilize this property to improve the mechanical properties of machine parts and mold parts by applying this treatment to the necessary locations.

In addition, by controlling the heating temperature during the process of copper diffusion and permeation, intermetallic compounds are generated and distributed between the steel and the atoms contained in the steel. This is a technology that freely brings out the additional properties of steel (hardness, toughness, wear resistance, brittleness, porousness, etc.) and configures the mechanical properties necessary for the part.

[Brief explanation of drawings]

FIG. 1 shows the state of diffusion and penetration into a material by the copper/copper alloy of the present invention. ■Diffusion-infiltrated two-layer alloy layer is shown. ■Indicates intermetallic compounds that have penetrated. ■Material Figure 2 shows an example of the shape of the material Figure 3 shows the state in which copper/copper alloy is applied to the material by plating, vapor deposition, thermal spraying, or other methods.

Claims (1)

[Claims] 1. Copper and copper alloy are applied to the surface of products or parts made of iron and iron-based alloys by plating, vapor deposition, thermal spraying, or other methods, and hardening is performed. A construction method that creates a two-layer alloy layer by diffusing copper and copper alloy into the surface layer of iron or iron-based alloy products or parts, and imparts strength characteristics to this layer. 2. A method for obtaining strength properties by reacting elements in iron and iron-based alloys in the layer diffused and permeated by the method described in claim 1 to form an intermetallic compound. 3. A powder metallurgy method in which copper/copper alloy is added during press forming, and two or more alloy layers or intermetallic compound layers are formed on the surface during sintering to obtain the required mechanical properties. 4. After powder metallurgy sintering, a construction method characterized by forming two or more alloy layers or intermetallic compound layers in the method described in claim 1 to obtain required mechanical properties.