KR101367702B1 - A manufacturing method of steel having multi-coating layer - Google Patents

Abstract

The present invention relates to a manufacturing method of steel including a multi-layered coating layer and more specifically, to a manufacturing method of steel including a multi-layered coating layer where a first CrN layer laminated on the surface of steel; a TiAlN layer laminated on the first CrN layer; and a second CrN layer laminated on the TiAlN layer and forming the outer surface of a multi-layered coating layer; are laminated in order. The steel according to the present invention is able to prevent damage to a film due to external impacts by including a high-hardness multi-layered coating layer; maintain excellent surface properties such as heat-resisting limit, friction coefficient, and corrosion resistance; simplify the production process and reduce the production cost, thereby improving the production efficiency; and secure reliable quality.

Description

A manufacturing method of steel having multi-coating layer

The present invention relates to a method for manufacturing a metal steel comprising a multi-layer coating layer, and more particularly, a first CrN layer laminated on a metal steel surface, a TiAlN layer stacked on the first CrN layer, and a multi-layer coating layer laminated on the TiAlN layer. It relates to a metal steel manufacturing method comprising a multi-layer coating layer sequentially formed of a second CrN layer forming an outer surface of the.

In general, mechanical structures such as automobile parts, molds required to fabricate such mechanical structures, and cutting tools required to process such components are used in the atmosphere so that the temperature rises to a high temperature in the atmosphere, and thus not only stability at high temperatures but also room temperature. High hardness and wear resistance are greatly required.

The performance of various mechanical structures, molds and cutting tools is determined by the physical properties of the surface area. The most common method of improving the physical properties of such a surface layer is to coat (coating) a film having excellent mechanical properties such as hardness, heat resistance limit, and friction coefficient at use temperature.

In general, the coating surface layer material is a physical vapor deposition method of coating the coating layer of carbide or nitride such as IV-A element such as Ti or Cr such as Cr on the base of mechanical structure, mold, cutting tool, etc. to realize complex performance. Hard films coated by PVD) or chemical vapor deposition (CVD) are generally used.

Such a hard thin film should also have excellent properties such as hardness and wear resistance, and high temperature stability is also one of the very important factors. This is because oxides formed at high temperatures significantly reduce abrasion resistance, and the TiAlN coating layer, which has been improved in hardness and oxidation resistance of the coating layer by adding Al element having excellent oxidation resistance to TiN, has recently replaced the existing coating tool. However, in the case of TiAlN-based coating material, the oxidation resistance is excellent due to the addition of Al, but the hardness is very weak, which inevitably limits the use thereof.

Domestic Publication No. 10-2007-0105614 Domestic Publication No. 10-2007-0080885

In order to solve the problems of the prior art as described above, the present invention includes a multi-layer coating layer that can effectively prevent the damage to the film due to the external impact by the hardness is significantly improved compared to the conventional coating thin film, including a high hardness multilayer coating layer. An object of the present invention is to provide a method for producing a metal steel material.

Another object of the present invention is to provide a method for manufacturing a metal steel material including a multilayer coating layer having excellent surface properties such as heat resistance limit, friction coefficient, and corrosion resistance.

In addition, an object of the present invention is to provide a method for manufacturing a metal steel material comprising a multi-layer coating layer that can increase the production efficiency, the production process is simple and can reduce the production cost, and obtain a stable quality metal steel material.

In order to achieve the above object, the present invention is a first CrN layer laminated on a metal steel surface, a TiAlN layer stacked on the first CrN layer and a second CrN layer stacked on the TiAlN layer to form an outer surface of the multilayer coating layer. It provides a metal steel comprising a multi-layer coating layer characterized in that formed sequentially.

The thickness of the first CrN layer is 1 to 2 µm, the thickness of the TiAlN layer is 3 to 5 µm, and the thickness of the second CrN layer is 2 to 3 µm.

It is preferable that the hardness of the said metal steel is high hardness of 2,500-3,300 kgf / mm <2>.

In another aspect, the present invention comprises the step of sequentially forming the first CrN layer, TiAlN layer and the second CrN layer on the surface of the metal steel by metal sputtering method of manufacturing a metal steel comprising a multi-layer coating layer to provide.

내지 15mtorr로 유지하면서, N₂ 가스를 주입하고, 상기 타겟 및 금속강재에 전압을 인가하여 수행될 수 있다.The metal sputtering is performed by using a vacuum chamber in which a target and a metal steel are installed.

While maintaining at 15 mtorr, it may be performed by injecting N ₂ gas and applying a voltage to the target and the metal steel.

The target is Cr, Ni and Al, the voltage of the target is 80 ~ 85V, the voltage of the metal steel is preferably 80 ~ 90V.

In addition, the present invention may further perform a pretreatment step consisting of cleaning the surface of the metal steel material and removing impurities from the metal steel surface before the metal sputtering.

In addition, after the metal sputtering, the gloss portion may further perform a step.

Metallurgical steel according to the present invention, including a high hardness multilayer coating layer is significantly improved in hardness compared to the existing coating thin film not only effectively prevents damage to the film due to external impact, but also heat limit, friction coefficient, corrosion resistance And excellent surface properties can be maintained continuously. In addition, according to the present invention, the production process is simple, and the production cost can be reduced, thereby increasing production efficiency, and obtaining a stable quality metal steel.

1 is a cross-sectional view of a metal steel including a multilayer coating layer in which a first CrN layer, a TiAlN layer, and a second CrN layer are sequentially stacked according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail.

Hereinafter, the metal steel described in the present invention means a mold for a vehicle body, an electric / electronic component, and the like, and the metal steel material including the multilayer coating layer of the present invention has a CrN layer-TiAlN layer-CrN on the surface of the mold as described above. This means that the layers are sequentially stacked.

In the metal steel including the multilayer coating layer of the present invention, a first CrN layer is formed on the surface of the metal steel, a TiAlN layer is sequentially stacked on the first CrN layer, and a second CrN layer is sequentially stacked on the TiAlN layer to further improve hardness. It is characterized by.

The metal steel may be subjected to a step of pretreating the surface in order to facilitate the electrodeposition of the metal during the subsequent metal sputtering process.

The pretreatment step may include cleaning the metal steel and removing impurities from the metal steel surface.

In the cleaning step, the first plasma cleaning for 10 to 20 minutes by injecting Ar gas at a temperature of 550 ~ 650V, a temperature of 350 ~ 450 ℃ using a vacuum chamber in which a metal steel is installed therein, the voltage of 650 ~ 750V Secondary plasma cleaning may be performed for 10 to 20 minutes at a temperature of 350 to 450 ° C. In this case, the metal steel may be rotated at a rotational speed of 1 to 5 rpm for even cleaning.

In addition, the cleaned metal steel was injected with N ₂ gas at a voltage of 350 to 450 V, a vacuum degree of 0.1 to 0.3 mtorr, and a temperature of 350 to 450 ° C. at 100 to 1,000 sccm, and then washed for 1 to 5 minutes. N ₂ gas was injected at 100 to 1.000 sccm at a voltage of ˜250 V, a vacuum degree of 0.1 to 0.3 mtorr, and a temperature of 350 to 450 ° C. to wash for 1 to 5 minutes to remove impurities from the surface of the metal steel. In this case, the metal steel may be rotated at a rotational speed of 1 to 5 rpm.

Then, CrN, TiAlN and CrN are sequentially coated on the surface of the pretreated metal steel as described above. That is, in the present invention, by coating CrN, TiAlN and CrN on the surface of the metal steel sequentially, the TiAlN layer significantly improves the film hardness compared to the existing coating thin film, and by forming a CrN layer on the upper and lower surfaces of the TiAl layer, lubricity and adhesion It is possible to prevent damage to the film of the high hardness TiAlN layer and further improve the coefficient of friction (wear resistance), corrosion resistance and the like of the multilayer coating layer.

Hereinafter, for convenience, the CrN layer formed on the surface of the metal steel is formed as the first CrN layer, and the CrN layer formed on the TiAlN layer to form the outermost part of the multilayer coating layer formed on the surface of the metal steel is divided into the second CrN layer. Explain.

Of course, a conventional method used in the art may be used as a deposition method for forming the multilayer coating layer.

내지 15mtorr로 유지하면서, N₂ 가스를 주입하고, 상기 타겟 및 금속강재에 전압을 인가하여 수행되는 통상의 마그네트론 스퍼터링법을 사용하여 수행될 수 있다. Formation of the multilayer coating layer of the present invention by using a vacuum chamber in which the target and the metal steel is installed, the degree of vacuum inside the chamber

It can be carried out using a conventional magnetron sputtering method, which is performed by injecting N ₂ gas and applying a voltage to the target and the metal steel while maintaining at 15 to 15 mtorr.

Specifically, the first CrN layer formed on the surface of the metal steel is formed to impart lubricity to the surface of the metal steel to prevent the adhesion strength or hardening, the metal steel voltage 80 ~ 90V, target voltage 80 ~ 85V, vacuum degree In a vacuum chamber in which N ₂ gas is injected at 100 to 1,000 sccm at a temperature of 14 to 15 mtorr and 350 to 450 ° C, Cr ions generated by applying a voltage to the Cr target collide with the surface of the metal steel to activate it. One CrN layer can be deposited. In this case, when the range of the metal steel voltage and the target voltage is outside the above-described range, the coating layer may be formed quickly, but may not be evenly formed on the surface of the metal steel. Therefore, the metal steel material and the target voltage are better to form a uniform and even coating layer in the above-described range. In addition, when forming the coating layer, it is possible to control the film thickness by adjusting the coating time as necessary.

The first CrN layer is preferably formed to a thickness of 1 to 2㎛, more preferably 1.5 to 2㎛. If the thickness is less than 1㎛ premature peeling, if it exceeds 2㎛ may increase the manufacturing cost.

Next, as a layer for imparting hardness to the multilayer coating layer of the present invention, metal steel voltage 80 ~ 90V, target voltage 80 ~ 85V, vacuum degree 14 ~ 15mtorr, injection of N ₂ gas at 100 ~ 1,000sccm at 350 ~ 450 ℃ In the vacuum chamber, the TiAlN layer is deposited by energizing Ti and Al ions generated by applying voltages to the Ti and Al targets on the first CrN layer.

The TiAlN layer is preferably formed to a thickness of 3 to 5㎛, more preferably 3.5 to 4.5㎛. Abrasion resistance is inferior when the thickness is less than 3 micrometers. If the thickness exceeds 5 µm, manufacturing costs may rise and the membrane may burst.

Finally, in order to prevent film damage of the TiAlN layer and to impart lubricity, the N ₂ gas is 100 to 1,000 sccm at a metal steel voltage of 80 to 90 V, a target voltage of 80 to 85 V, a vacuum degree of 14 to 15 mtorr, and 350 to 450 ° C. In the injected vacuum chamber, Cr ions generated by applying a voltage to the Cr target are collided onto the TiAlN layer to activate a second CrN layer which forms the outermost layer of the multilayer coating layer.

The second CrN layer is preferably formed to a thickness of 2 to 3㎛, more preferably 2.5 to 3㎛. If the thickness is less than 2㎛ may be premature peeling, if it exceeds 3㎛ the manufacturing cost rise and the film may burst.

As described above, the metal steel material including the multilayer coating layer in which the first CrN layer, the TiAlN layer, and the second CrN layer are sequentially stacked has a metal steel voltage of 80 to 90 V, a target voltage of 80 to 85 V, and a vacuum degree of 14 to 15 mtorr and 350 to 450 ° C. In the vacuum chamber in which the N ₂ gas is injected 100 ~ 1,000sccm may be further performed by adding a gloss by nitrogen gas to the surface of the multilayer coating layer while rotating the metal steel 1-5rpm times.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the metal steel formed with a multi-layer coating layer of the present invention. Metal layer formed with a multi-layer coating layer of the present invention described below can be implemented in a number of different forms, of course, here It is not limited to the metal steel in which the multilayer coating layer demonstrated by this is formed.

1 is a cross-sectional view of a metal steel having a multi-layer coating layer according to an embodiment of the present invention.

As shown in FIG. 1, the metal steel material 1 having the multilayer coating layer of the present invention includes a metal steel material 10 and a first CrN layer having a thickness of 1 μm to 2 μm on the surface of the metal steel material 10. 21), the TiAlN layer 22 is formed on the first CrN layer 21 to a thickness of 3 ~ 5㎛ and the TiAlN layer 22 is formed to a thickness of 2 ~ 3㎛ to form the outermost layer of the multilayer coating layer The second CrN layer 23 is formed.

The metal steel of the present invention, in which the first CrN layer, the TiAl layer, and the second CrN layer are sequentially stacked on the surface of the metal steel, has a high hardness of 2,500 to 3,300 kgf / mm 2, a heat resistance limit, a friction coefficient, and corrosion resistance. It has the advantage of excellent surface properties.

Hereinafter, the present invention will be described in more detail with reference to examples. These embodiments are for purposes of illustration only and are not intended to limit the scope of protection of the present invention.

Example 1

The first CrN layer, the TiAlN layer, and the second CrN layer were sequentially formed on the metal steel surface by using the vacuum chamber in which the metal steel and the target were installed.

First, Ar gas was injected at a voltage of 600 V and a temperature of 420 ° C., followed by primary plasma cleaning by Ar gas for 14 minutes (5 revolutions of metal steel), and a voltage of 700 V and 14 minutes at a temperature of 420 ° C. for 2 minutes. Primary plasma cleaning can be performed (5 revolutions of metal steel). Subsequently, N ₂ gas was injected at 300 sccm at a voltage of 400 V, a vacuum of 5 mtorr and a temperature of 420 ° C., followed by washing for 2 minutes (four revolutions of metal steel), followed by a voltage of 200 V, a vacuum of 7 mtorr, and a temperature of 420 ° C. ₂ gases were injected at 320 sccm and washed for 2 minutes to remove impurities from the metal steel surface (4 times of metal steel revolutions).

Next, in a vacuum chamber in which N ₂ gas was injected at 420 sccm at a metal steel voltage of 80 V, a target voltage of 80 V, a vacuum degree of 15 mtorr, and 420 ° C., Cr ions generated by applying the voltage to the Cr target were collided with the surface of the metal steel. After activation, the first CrN layer was deposited to a thickness of about 1.5 μm on the surface of the gold steel (metal revolutions of four times). Injecting N ₂ gas into 420sccm at a metal steel voltage of 80V, a target voltage of 80V, a vacuum degree of 15mtorr, and 420 ° C, and applying Ti and Al targets to Ti and Al ions by impinging on the first CrN layer to activate TiAlN. The layer was deposited to 4 μm thickness (4 metal steel revolutions). Finally, injecting N ₂ gas into 420sccm at a metal steel voltage of 80 V, a target voltage of 80 V, a vacuum of 15 mtorr, and at 420 ° C., applying Cr to the Cr target and impinging Cr ions generated on the TiAlN layer to activate the second CrN layer. Was deposited to a thickness of 2.5 mu m (4 revolutions of metal steel).

Example 2

In Example 1, a N ₂ gas 520 sccm in a vacuum chamber at 80 V, a target voltage of 80 V, a vacuum degree of 30 mtorr, and a 420 ° C. was fabricated using a multilayer coating layer in which the first CrN layer, the TiAlN layer, and the second CrN layer were sequentially stacked. The same procedure as in Example 1 was carried out except that gloss was further added by nitrogen gas in the injected vacuum chamber.

The physical properties such as hardness, heat resistance, coefficient of friction and the like were measured using a metal steel material including a multilayer coating layer in which the first CrN layer-TiAlN layer-second CrN layer prepared in Examples 1 and 2 were sequentially stacked, and the The results are shown in Table 1 below. In this case, for comparison, a conventional metal steel with a CrN layer, a metal steel with a TiAlN layer, and a metal steel with a TiN layer were used.

Hardness (Hv) Heat resistance limit (℃) Coefficient of friction Corrosion resistance Example 1 3,100 800 0.8 Very good Example 2 3,000 850 0.8 Very good CrN layer forming metal steel 1,900 700 0.5 Very good TiAlN layer forming metal steel 2,900 800 0.8 Great TiN layer forming metal steel 2,100 550 0.65 Great

As shown in Table 1, in the case of the metal steels of Examples 1 and 2 including a multilayer coating layer in which the first CrN layer, the TiAlN layer, and the second CrN layer were sequentially stacked according to the present invention, the metal steel having the existing CrN layer was formed. It was confirmed that the hardness was superior to that of the metal steel with the TiAlN layer and the metal steel with the TiN layer, and the heat limit, friction coefficient and corrosion resistance were also excellent.

Although the present invention has been described in terms of the preferred embodiments mentioned above, it is possible to make various modifications and variations without departing from the spirit and scope of the invention. It is also to be understood that the appended claims are intended to cover such modifications and changes as fall within the scope of the invention.

Claims (9)

delete delete delete After performing a pretreatment step of cleaning the surface of the metal steel and removing impurities from the surface of the metal steel, the first CrN layer, the TiAlN layer, and the second CrN layer are sequentially formed through metal sputtering on the metal steel surface. Including forming step,
The cleaning step is performed for 10 to 20 minutes by injecting Ar gas at a voltage of 550 ~ 650V, a temperature of 350 ~ 450 ℃ using a vacuum chamber installed inside the metal steel rotating at a rotational speed of 1 ~ 5rpm It consists of the first plasma cleaning, the second plasma cleaning performed for 10 to 20 minutes at a voltage of 650 ~ 750V, a temperature of 350 ~ 450 ℃,
The removing of impurities from the surface of the metal steel is performed by rotating the cleaned metal steel at a rotational speed of 1 to 5 rpm with a voltage of 350 to 450 V, a vacuum degree of 0.1 to 0.3 mtorr, and a temperature of 350 to 450 ° C. in the chamber. ₂ Inject gas at 100 ~ 1,000 sccm and wash it for 1 ~ 5 minutes, then inject N ₂ gas at 100 ~ 1.000sccm at the voltage of 150 ~ 250V, vacuum degree 0.1 ~ 0.3mtorr, 350 ~ 450 ℃ Method for producing a metal steel comprising a multi-layer coating layer, characterized in that the washing for 5 minutes. 5. The method of claim 4,
The metal sputtering is performed by using a vacuum chamber in which a target and a metal steel are installed.

Maintaining from 15 mtorr, injecting N ₂ gas, and applying a voltage to the target and the metal steel, characterized in that the manufacturing method of a metal steel comprising a multi-layer coating layer. The method of claim 5,
The target is a method of manufacturing a metal steel material comprising a multilayer coating layer, characterized in that at least any one selected from Cr, Ni and Al. The method of claim 5,
The voltage of the target is 80 ~ 90V, the voltage of the metal steel is a manufacturing method of a metal steel comprising a multi-layer coating layer, characterized in that 80 ~ 85V. delete 5. The method of claim 4,
After the metal sputtering method of manufacturing a metal steel comprising a multi-layer coating layer characterized in that further performing the step of the gloss.

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