KR101249049B1 - Thermal spray coating method using laser and thermal spray coating layer using the same - Google Patents

Thermal spray coating method using laser and thermal spray coating layer using the same Download PDF

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KR101249049B1
KR101249049B1 KR20100137225A KR20100137225A KR101249049B1 KR 101249049 B1 KR101249049 B1 KR 101249049B1 KR 20100137225 A KR20100137225 A KR 20100137225A KR 20100137225 A KR20100137225 A KR 20100137225A KR 101249049 B1 KR101249049 B1 KR 101249049B1
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South Korea
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spray coating
laser
powder
coating layer
thermal spray
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KR20100137225A
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Korean (ko)
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KR20120075178A (en
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박순홍
황순영
조남웅
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재단법인 포항산업과학연구원
주식회사 포스코
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Priority to KR20100137225A priority Critical patent/KR101249049B1/en
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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

The laser spray coating method according to the present invention may include forming a coating powder by mixing tungsten carbide powder with a metal powder, and melting and cooling the coating powder with a laser beam to form a spray coating layer on a base material. have.

Description

Laser spray coating method and spray coating layer using the same {THERMAL SPRAY COATING METHOD USING LASER AND THERMAL SPRAY COATING LAYER USING THE SAME}

The present invention relates to a laser spray coating method and a spray coating layer using the same.

In general, a uniform and wear-resistant coating layer is formed by using high-velocity oxygen coating (HVOF) or physical vapor deposition (PVD).

In particular, the thermal spray coating has a merit that the life of the coating layer can be made thicker than the physical vapor deposition method.

However, the thermal spray coating method is a method of forming a thermal spray coating layer by spraying a coating solution in a semi-melt droplet state on the base material, there is only a physical adhesive force between the base material and the thermal spray coating layer, there is no chemical reaction or thermal remelting process. Therefore, the thermal spray coating layer formed by the thermal spray coating method has a low adhesive strength with the base material, and a large amount of bubbles are formed inside the thermal spray coating layer because the coating liquid in the semi-melt droplet state is deposited on the base material.

Therefore, when the thermal spray coating layer is formed on the surface of a wear-producing component or a component requiring corrosion resistance, the thermal spray coating layer may not function properly due to the weak adhesion between the thermal spray coating layer and the base material and the bubbles inside the thermal spray coating layer, thereby causing component defects. Can be.

The present invention is to solve the above problems of the background art, to provide a high adhesion, wear-resistant and corrosion-resistant spray coating layer and a laser spray coating method for forming such a spray coating layer.

Laser spray coating method according to an embodiment of the present invention is a step of forming a coating powder by mixing tungsten carbide powder to metal powder, melting and cooling the coating powder with a laser beam to form a spray coating layer on the base material It may include.

The metal powder may be nickel, cobalt-based metal powder.

The tungsten carbide powder may be contained in more than 0wt% of the coating powder, less than 70wt% of the coating powder.

The tungsten carbide powder may have a diameter ranging from 40 to 150 μm.

The method may further include removing a part of the surface of the thermal spray coating layer.

An upper portion having a thickness corresponding to 10% of the thickness of the sprayed coating layer may be removed.

The thermal spray coating layer according to an embodiment of the present invention includes nickel, cobalt-based metal and tungsten carbide powder, the diameter of the tungsten carbide powder may range from 40 to 150㎛.

The tungsten carbide powder may be contained in more than 0wt%, less than 70wt%.

Laser spray coating method according to an embodiment of the present invention to form a spray coating layer on the base material by melting and cooling the coating powder mixed with tungsten carbide powder to the metal powder with a laser beam to form a high adhesion, wear-resistant and corrosion-resistant coating layer Can be.

In addition, by using a laser spray coating method, the coating powder may be rapidly heated and rapidly cooled to realize excellent surface adhesion characteristics and to minimize the thermal effect of the base metal.

In addition, by forming a thermal spray coating on the frictional base material with high frictional wear, it is possible to extend the life of the frictional base material by improving wear resistance and friction resistance.

In addition, it is possible to minimize defects in the quality of the base material due to poor driveability due to uneven wear of the frictional base material.

1 is a schematic diagram of a laser spray coating apparatus according to an embodiment of the present invention.
2 is a flow chart of the laser spray coating method according to an embodiment of the present invention.
Figure 3 is a cross-sectional view of the thermal spray coating layer and the base material according to an embodiment of the present invention.
Figure 4 is an electron scanning micrograph of the thermal spray coating layer according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Then, a laser spray coating method according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

1 is a schematic diagram of a laser spray coating apparatus according to an embodiment of the present invention, Figure 2 is a flow chart of a laser spray coating method according to an embodiment of the present invention, Figure 3 is a sprayed according to an embodiment of the present invention It is sectional drawing of a coating layer and a base material.

As shown in Figure 1, the laser spray coating apparatus according to an embodiment of the present invention supplies a laser generating device 10, a coating powder (2) for generating a laser (1) and focus the laser (1) Laser coating head 20 to form a thermal spray coating layer 110 on the base material 100, a control device 30 for adjusting the laser generating device 10 and the laser coating head 20, and a molten thermal spray coating layer 110. It includes a cooler (not shown) for cooling the.

The laser generator 10 may include a diode laser, a fiber laser, a CO 2 laser, a YAG laser, or the like.

The laser coating head 20 includes a nozzle 21 for supplying the coating powder 2 and a laser penetrating portion 22 to which the laser 1 is irradiated. The coating powder 2 is melted by the laser 1 passing through the laser penetrating portion 22 to form the thermal spray coating layer 110.

The adjusting device 30 controls the laser generating device 10 to adjust the intensity of the laser 1 to be irradiated, and the like, and the spray coating layer 110 is formed on the base material 100 by controlling the laser coating head 20. Adjust the coating area.

In the laser spray coating method using the laser spray coating apparatus, first, as shown in FIG. 2, tungsten carbide powder 112 is mixed with metal powder to form a coating powder 2 (S100). ).

The metal powder may be a metal powder such as nickel, cobalt or iron, the tungsten carbide powder 112 may be a spherically fused powder, and the diameter d of the tungsten carbide powder 112 may be 40 to 250 μm. Can be.

When the diameter of the tungsten carbide powder 112 is smaller than 40 μm, the tungsten carbide powder 112 is decomposed during the thermal spray coating process and thus does not play a role in wear resistance. When the diameter of the tungsten carbide powder 112 is larger than 250 μm, Since the metal powder does not sufficiently wrap the tungsten carbide powder 112, cracks may occur during the spray coating process.

The tungsten carbide powder 112 may be contained in an amount greater than 0 wt% in the coating powder 2 and in an amount less than 70 wt% in the coating powder 2.

As the content of the tungsten carbide powder 112 increases, wear resistance increases. However, when the content of the tungsten carbide powder 112 is greater than 70 wt%, cracks may occur due to a difference in the coefficient of thermal expansion of the metal 111 and the tungsten carbide powder 112.

Next, the coating powder 2 is supplied to the laser spray coating apparatus to melt and cool the coating powder 2 with the laser 1 to form the spray coating layer 110 on the base material 100 (S200).

At this time, the laser generating device 10 may have a power of 0.7 to 3.0kW.

Since the metal powder may be melted by the laser generated by the laser generating apparatus and may be wrapped around the tungsten carbide powder 112 and bonded to the surface of the base material 100, the bonding force between the surface of the base material 100 and the thermal spray coating layer 110 may be used. Can improve. Such a laser cladding process is performed to form the thermal spray coating layer 110.

As such, by using the laser spray coating apparatus, the coating powder 2 may be rapidly heated and rapidly cooled to implement excellent surface adhesion characteristics and minimize the thermal effect of the base material 100.

Next, as shown in FIG. 3, a portion 120 of the surface of the thermal sprayed coating layer 110 is removed (S300). At this time, the upper portion 120 having a thickness t2 corresponding to 10% of the thickness t1 of the sprayed coating layer 110 may be removed. As such, by removing a portion 120 of the surface of the thermal spray coating layer 110, the roughness of the surface of the thermal spray coating layer 110 may be minimized. In addition, the tungsten carbide powder 112 generated inside the thermal spray coating layer 110 due to the difference in specific gravity between the vortex generated in the thermal spray coating layer 110 by the laser 1 and the metal powder and the tungsten carbide powder 112 may be formed. The deficiency interval can be minimized.

The thermal spray coating layer formed by the laser spraying method will be described in detail with reference to FIGS. 3 and 4 below.

Figure 4 is an electron scanning micrograph of the thermal spray coating layer according to an embodiment of the present invention.

3 and 4, the spray coating layer 110 formed by the laser spraying method is formed on the base material 100.

The thermal spray coating layer 110 formed on the base material 100 includes nickel, cobalt-based metal 111 and tungsten carbide powder 112. The tungsten carbide powder 112 may have a diameter ranging from 40 to 150 μm. Tungsten carbide powder 112 may contain more than 0 wt% and less than 70 wt%. If the diameter d of the tungsten carbide powder 112 is smaller than 40 µm, the tungsten carbide powder 112 is decomposed during the thermal spraying coating process and thus does not play a role in wear resistance, and the diameter d of the tungsten carbide powder 112 is If the thickness is larger than 250 μm, the metal 111 may not sufficiently cover the tungsten carbide powder 112, and cracks may occur during the spray coating process. As the content of the tungsten carbide powder 112 increases, wear resistance increases. However, when the content of the tungsten carbide powder 112 is greater than 70 wt%, cracks may occur due to a difference in the coefficient of thermal expansion of the metal 111 and the tungsten carbide powder 112.

Table 1 below shows the amount of wear of the single shaft when the thermal spray coating layer 110 according to the embodiment of the present invention and the conventional thermal spray coating layer are formed in the water bearing unit, which is a typical wear resistant part.

Bearing part coating layer Type of bush Uniaxial wear Torque value cobalt
Tungsten Carbide Sialon 0.005mm 13Nm Conventional spray coating layer Sialon 0.1 ~ 1mm 35 Nm

As shown in Table 1, it can be seen that the amount of wear of the single shaft is reduced to within 5% compared to the case of forming a conventional spray coating layer, and the driving performance is also improved.

As such, by forming the thermal spray coating layer 110 using the laser spray coating method, wear resistance and friction resistance may be improved.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the following claims. Those who are engaged in the technology field will understand easily.

100: base material 110: thermal spray coating layer
111: metal 112: tungsten carbide powder

Claims (8)

Mixing tungsten carbide powder with the metal powder to form a powder for coating;
Melting and cooling the coating powder with a laser beam to form a spray coating layer on a base material; and
Removing the upper part having a predetermined thickness of the surface of the thermal spray coating layer
Laser spray coating method comprising a. In claim 1,
The metal powder is nickel, cobalt-based metal spray coating method characterized in that the metal powder. In claim 1,
The tungsten carbide powder is contained in more than 0wt% of the coating powder, less than 70wt% of the coating powder for the laser spray coating, characterized in that. In claim 1,
The diameter of the tungsten carbide powder is in the range of 40 to 150㎛ laser spray coating method. delete 5. The method according to any one of claims 1 to 4,
Laser spray coating method characterized in that for removing the upper portion having a thickness corresponding to 10% of the thickness of the thermal spray coating layer. delete delete
KR20100137225A 2010-12-28 2010-12-28 Thermal spray coating method using laser and thermal spray coating layer using the same KR101249049B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018111013A1 (en) * 2016-12-14 2018-06-21 주식회사 포스코 Resistance welding electrode and manufacturing method therefor
KR102414088B1 (en) 2021-11-23 2022-06-28 대동중공업주식회사 Ribbon screw maintenance method using ribbon screw maintenance device of horizontal mixer
KR102474002B1 (en) 2021-11-23 2022-12-05 대동중공업주식회사 To improve abrasion resistance, a ribbon screw of a horizontal mixer that's hard-paced

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170059523A (en) 2015-11-20 2017-05-31 삼성디스플레이 주식회사 Display apparatus, tiled display apparatus and method of manufacturing the same
KR20180061699A (en) * 2016-11-30 2018-06-08 한국생산기술연구원 Method for laminating tungsten carbide and binder through laser cladding

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070081439A (en) * 2006-02-10 2007-08-16 닛산 지도우샤 가부시키가이샤 Manufacturing method of cylindrical inner surface and member having the cylindrical inner surface
JP4083817B2 (en) * 1997-05-28 2008-04-30 インベジャイアー インコーポレーテッド Surface wear-resistant sintered machine parts and manufacturing method thereof
KR20100047705A (en) * 2008-10-29 2010-05-10 주식회사 포스코 Assembled scale breaker roll with excellent abrasion resistance
KR20120044085A (en) * 2010-10-27 2012-05-07 주식회사 포스코 Bearing part of pot roll in galvanizing line and method for coating bearing part of pot roll

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4083817B2 (en) * 1997-05-28 2008-04-30 インベジャイアー インコーポレーテッド Surface wear-resistant sintered machine parts and manufacturing method thereof
KR20070081439A (en) * 2006-02-10 2007-08-16 닛산 지도우샤 가부시키가이샤 Manufacturing method of cylindrical inner surface and member having the cylindrical inner surface
KR20100047705A (en) * 2008-10-29 2010-05-10 주식회사 포스코 Assembled scale breaker roll with excellent abrasion resistance
KR20120044085A (en) * 2010-10-27 2012-05-07 주식회사 포스코 Bearing part of pot roll in galvanizing line and method for coating bearing part of pot roll

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018111013A1 (en) * 2016-12-14 2018-06-21 주식회사 포스코 Resistance welding electrode and manufacturing method therefor
KR102414088B1 (en) 2021-11-23 2022-06-28 대동중공업주식회사 Ribbon screw maintenance method using ribbon screw maintenance device of horizontal mixer
KR102474002B1 (en) 2021-11-23 2022-12-05 대동중공업주식회사 To improve abrasion resistance, a ribbon screw of a horizontal mixer that's hard-paced

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