JPH07118877A - Sintered cemented carbide coating member - Google Patents

Abstract

PURPOSE:To prevent the generation of rust by forming a rust preventive metal plated layer on the whole surface of an iron base even if a part on which a sintered cemented carbide coating layer is not formed is produced or fine gaps among the crystallites of the sintered cemented carbide are generated. CONSTITUTION:The coating layer (3) of the sintered cemented carbide is formed on the rust preventive metal plated layer (2) by forming the rust preventive metal plated layer (2) on the whole surface of the iron made base material (1) and forming at least one of a TiC layer and a Ti(C, N) layer on the rust preventive metal plated layer (2). As a result, the golden yellow colored fine appearance is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cemented carbide coating member made of an iron material that requires hardness and rust resistance, such as fishing hooks and spikes. The present invention relates to a hard alloy coating member.

[0002]

2. Description of the Related Art In conventional cemented carbide coated members,
The cemented carbide coating layer was formed by directly coating the cemented carbide on the iron substrate. As shown in FIG. 1, the cemented carbide coating method is performed by placing an iron material on a metal net in a chamber and gasifying a compound such as oxide or chloride, carbide, or nitride of the cemented carbide at a high temperature. After being converted and sent into the chamber, hydrogen gas is sent into the chamber together with nitrogen gas, carbon gas, etc., and the compound is reduced with hydrogen in the chamber to deposit the cemented carbide directly on the iron substrate and form the coating layer. The method of forming was used.

However, according to this method, the portion in contact with the wire mesh is masked, the coating layer of cemented carbide is not formed, and the iron base is exposed.
Therefore, the exposed part of the iron base becomes a soft spot on the cemented carbide coating layer and is easily corroded,
It becomes a rusting point. Further, the precipitate of the cemented carbide is a granular single crystal, and there are fine gaps in the grain boundaries of the single crystal, and moisture or the like reaches the iron base through this gap and causes rusting.

For example, parts such as fishing hooks and spikes that have a high chance of coming into contact with water and salt and are prone to rust, and in parts where hardness of the tip portion is required, the hardness of the cemented carbide coating layer alone is sufficient. Even if the surface is satisfied, it is insufficient in terms of rust prevention, and there has been a demand for a material that satisfies both of them. In addition, in the case of super hard metal members, it is not enough to simply rust or harden, and decorativeness tends to be emphasized. In particular, a super hard metal member with a luxurious golden color is desired in the sales strategy. Was there.

[0005]

Therefore, the problem to be solved by the present invention is to form a rust-preventive metal plating layer on the entire surface of an iron substrate, so that even if a portion where the cemented carbide coating layer is not formed occurs, SUMMARY OF THE INVENTION It is an object of the present invention to provide a cemented carbide coating member which can prevent the formation of rust even if a fine gap is formed between single crystals of the cemented carbide and can exhibit a beautiful golden color appearance.

[0006]

Means for Solving the Problems In order to achieve the above object, the present invention comprises: forming an anticorrosion metal plating layer (2) on the entire surface of an iron material (1), and forming an antirust metal plating layer (2) on the surface. TiC layer or Ti (C, N)
At least one of the layers is formed, and a TiN layer is further formed as the outermost layer to form a cemented carbide coating layer (3) on the rust-preventive metal plating layer (2). , Which is a technical means.

[0007]

[Function] For example, with a fishing hook, it is easy to attach "food",
The tip of the fish must be as sharp and as hard as possible in order to catch the fish that it eats. In addition, spikes often bite into the soil and lift up the soil, so it must have excellent wear resistance.
High hardness is required. At the same time, both fishing hooks and spikes often come into contact with water and salt, and high rust resistance is required. at the same time,
In order to increase the willingness to purchase, it is also necessary to have luxurious appearance, and it is very important for the sales strategy to make the surface of the member golden. Therefore, in the present invention, iron materials such as fishing hooks and spikes are used.
Since the anticorrosion metal plating layer (2) is formed on the entire surface of (1), even if the cemented carbide coating layer (3) formed on the anticorrosion metal plating layer (2) is not coated Even if the rust occurs, the rust-preventive metal plating layer (2) of the base prevents the iron base from being exposed and prevents "rust". Anti-corrosion metal plating layer for the part requiring hardness at the tip
(2) At least one of the TiC layer and the Ti (C, N) layer above is carried, and the golden color is carried by the outermost TiN layer. As a result, both rust prevention and high hardness are satisfied.

[0008]

The present invention will be described in detail below with reference to the illustrated embodiments, but the present invention is not limited thereto. The iron material (1) is required to have hardness and rust prevention, such as fishing hooks and golf spikes. First, a rust preventive metal plating layer (2) is formed as a coating base on the entire surface of the iron material (1). The types of plating are Ni, Cr, Au, Ag
A material having excellent rust resistance and heat resistance capable of withstanding the cemented carbide coating by plasma is used. Electroplating is used as the plating method. The Cr may be electroless plated. In the case of electroless plating, it is only necessary to immerse the iron material (1) in the plating solution, so it is ideal for applications such as the present invention that does not cause plating imperfections in the electrode part like electrolytic plating. is there. Further, the rust-preventive metal plating layer (2) of Ni, Cr, Au, Ag or the like may be not only one layer but also a plurality of layers.

Next, a cemented carbide coating layer (3) is formed on the rustproof metal plating layer (2). FIG. 1 is a schematic view of a CVD coating (chemical vapor deposition) apparatus (A) used in the present invention. Inside the reactor (4) is a chamber (5)
Are arranged, the wire nets (9) are installed in a plurality of stages, and the semi-finished products (10) after the plating treatment are stored. An evaporator (6) is arranged below the reaction furnace (4),
A metal compound to be supplied to the reaction furnace (4) is vaporized by a heater (8) and fed. A high-purity gas cylinder (11) for C gas, N ₂ gas, hydrogen gas, etc. is installed outside the CVD coating device (A).
It is designed to be supplied to (4). Similarly, metal compounds
A storage tank (7) (here, a metal halide) is installed outside the device (A), and is appropriately supplied to the evaporator (6). Plasma is generated in the reaction furnace (4), and the vaporized and supplied metal halide is reduced with hydrogen and simultaneously reacts with N ₂ gas or C gas to react with TiC or T
Precipitate and grow a carbide single crystal such as iN. The metal halide used above is, for example, TiCl ₄ or TiCN.

Then, the base-treated iron portion of the rust-preventive metal plating layer (2) is allowed to stand still on the wire net (9) in the chamber (5), and then the cemented carbide oxide or chloride is added. , Nitrides, carbides and other compounds are gasified at high temperature (usually 1100 ° C for 1 hr) and sent into the chamber (5) together with high-purity C gas, high-purity N ₂ gas, high-purity hydrogen gas, etc. A cemented carbide coating layer (3) is formed by reducing a cemented carbide compound with hydrogen to directly deposit and grow a hard alloy such as TiC or TiN on an iron substrate.

In the case of carbon-based gas, TiC is deposited, and in the case of nitrogen-based gas, TiN is deposited. TiC and TiN may be simultaneously deposited, or may be separately deposited to form two or more layers. As a result, for example, when the gold-colored surface layer is required, the outermost layer is TiN, when hardness is required, the outermost layer is TiC, and when an intermediate property between the two is required, Ti ( (C, N) is the outermost layer, the surface layer needs to be gold color, and when surface hardness is also required, TiN is laminated on TiC, and the characteristics of the cemented carbide coating layer (3) can be utilized. It is a thing.

The coating layer (3) is a porous single crystal grown as shown in FIG. As a result, most of the surface of the plating layer (2) is covered with the high hardness cemented carbide coating layer (3). However, as in the conventional example, the cemented carbide coating layer (3) is not formed in the portion in contact with the wire net (9), and the rust-preventive metal plating underlayer (2) is exposed.

When the iron material (1) treated with the cemented carbide is thus used, the cemented carbide coating layer (3) carries the portion requiring hardness and the portion requiring rust prevention is super The hard metal coating layer (3) and the part where the cemented carbide coating layer (3) is not formed are borne by the underlying rust-preventive metal plating layer (2), and the surface golden color is the outermost Ti layer.
By being supported by the N layer (3a), rust prevention, high hardness and luxury can be satisfied. In addition, in FIG.
The exhaust gas leaving the reaction furnace (4) is neutralized with a neutralizing agent, spray-washed, and discharged into the atmosphere. Also, the washing water is the device (A)
It is discharged outside.

Example 1 A heat-treated iron product having both toughness and hardness is sufficiently pickled to degrease its surface, and then Ni plating is performed as a first layer. Then, TiCl ₄ vapor, N ₂ gas and hydrogen gas are fed into the reaction furnace (4) to reduce TiCl ₄ with hydrogen to form a TiN layer on the surface of the Ni plating layer. Next, C gas is also supplied to form a Ti (C, N) mixed layer, and finally the supply gas is N
_A TiN layer is formed using only _two gases. Here, the outermost TiN layer (3a) (gold, 2,500Hv) and the next Ti (C, N) layer (3
b) with a thickness of about 5μ, TiC (3c) (metal color, 3,500H
v) was 2 μm and the Ni plating layer (2) was 20 μm.

When this product (fishhook) was used in sea fishing, it did not rust, and the feeding condition and the catch condition of the prey were also very good.

[0016]

As described above, the present invention forms an anticorrosion metal plating layer on the entire surface of an iron material and at least one of TiC and Ti (C, N) on the antirust metal plating layer. Since one is formed, for example, the tip of a fishing hook,
The cemented carbide coating layer carries the parts that require hardness, such as the tip of the spike, and the part where the cemented carbide coating layer is not formed prevents the iron base from being exposed by the rust-preventive metal plating layer. In addition, the outermost TiN layer can develop a beautiful and luxurious golden color, and it can add hardness, rust prevention and luxury to the iron material. There are advantages.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a CVD coating apparatus used in the present invention.

FIG. 2 is an enlarged view of a cemented carbide coating layer of the present invention.

FIG. 3 is an enlarged sectional view of the present invention.

[Explanation of symbols]

(A) ... CVD coating device (1) ... Iron material (2) ... Anticorrosive metal plating layer (3) ... Cemented carbide coating layer (4) ... Reactor (5) ... Chamber (6) ... Evaporator ( 7)… Storage tank (8)… Heater (9)… Wire mesh (10)… Semi-finished product (11)… Cylinder

Claims (1)

[Claims] 1. A rust-preventive metal plating layer is formed on the entire surface of an iron material, and at least one of a TiC layer and a Ti (C, N) layer is formed on the rust-preventing metal plating layer, and further as an outermost layer. A cemented carbide coating member, characterized in that a TiN layer is formed and a cemented carbide coating layer is formed on a rust preventive metal plating layer.