KR100347605B1 - Spray coating method of performance mold using high temperature wear resistant spray alloy - Google Patents
Spray coating method of performance mold using high temperature wear resistant spray alloy Download PDFInfo
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- KR100347605B1 KR100347605B1 KR1019980054787A KR19980054787A KR100347605B1 KR 100347605 B1 KR100347605 B1 KR 100347605B1 KR 1019980054787 A KR1019980054787 A KR 1019980054787A KR 19980054787 A KR19980054787 A KR 19980054787A KR 100347605 B1 KR100347605 B1 KR 100347605B1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/0006—Spraying by means of explosions
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
- C22C1/053—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds
- C22C1/055—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds using carbon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/126—Detonation spraying
Abstract
본 발명은 연주 몰드의 수명을 향상시키기 위해 고온 내마모성 폭발용사 코팅층을 형성시키도록 고인성과 고온 내마모성을 갖춘 용사합금을 사용한 연주몰드의 용사코팅 방법에 관한 것으로, 크래드 텅스텐카바이드(WC-20Co)와 Co계 용사합금을 2:8∼5:5로 혼합한 용사합금을 사용하는 것을 특징으로 한다.The present invention relates to a spray coating method of a casting mold using a thermal spraying alloy having high toughness and high temperature wear resistance to form a high temperature wear resistant explosion spray coating layer to improve the life of the performance mold. It is characterized by using a thermal spray alloy in which a Co-based thermal spray alloy is mixed at 2: 8 to 5: 5.
본 발명에 따라 크래드 텅스텐카바이드와 Co계 용사합금을 혼합하여 용사코팅을 실시함으로써 고온 내마모성이 향상되어 연주 몰드의 수명을 연장시킬 수 있다.According to the present invention, by spraying the coating by mixing the tungsten carbide and Co-based thermal spray alloy, high temperature wear resistance can be improved to extend the life of the playing mold.
Description
본 발명은 연주 몰드의 수명을 향상시키기 위하여 고온 내마모성 폭발용사 코팅층을 형성시키는 용사합금에 관한 것으로, 보다 상세하게는 고인성과 고온 내마모성을 갖춘 용사합금을 사용한 연주몰드의 용사코팅 방법에 관한 것이다.The present invention relates to a thermal spray alloy for forming a high temperature wear resistant explosion spray coating layer in order to improve the life of the performance mold, and more particularly, to a thermal spray coating method of the molten mold using a thermal spray alloy having high toughness and high temperature wear resistance.
용사코팅 기술은 아세틸렌, 산소, 프로판, 프로필렌, 석유, 수소, 플라즈마, 아크 등을 이용하여 금속, 세라믹, 초경합금 등을 반용융시켜 금속 피막에 다양한 용도의 피막을 형성시키는 기술이다.Spray coating technology is a technique for forming a film of various uses on the metal film by semi-melting metal, ceramic, cemented carbide using acetylene, oxygen, propane, propylene, petroleum, hydrogen, plasma, arc, and the like.
90년대에는 기존의 폭발 용사코팅과 유사한 성능을 가진 고속 용사(High Velocity Oxy-Fuel)코팅 기술이 잇따라 개발되면서 그 용도가 점차 넓어지고 있다.In the 90s, the application of High Velocity Oxy-Fuel coating technology, which has similar performance to that of conventional explosion spray coatings, was being developed.
오늘날 첨단산업의 발전에 따라 가혹한 조건인 마모, 부식 분위기 등에서 사용되는 설비, 기계부품, 공구류의 성능 및 수명 향상이 요구되며, 이를 위해 보호 코팅이 사용되고 있고, 그 사용분야는 항공기, 원자력, 전자부품, 석유화학 등의 산업에 광범위하게 사용될 수 있다.With the development of today's high-tech industries, the performance and lifespan of equipment, machine parts, and tools used in harsh conditions such as abrasion and corrosive atmospheres are required.For this purpose, protective coatings are used. It can be widely used in industries such as petrochemical.
특히, 연속주조 기술은 최근에 연주화 비율이 증가하고 있으며, 설비사양면에서 주편 단면의 대형화와 다스트랜드화를 통해 주조시간율을 향상시키며, 비가동 시간이 되는 준비시간과 정수시간을 단축하여 주조능력을 향상시키고 있다. 특히, 정수시간을 연장함에는 수명 연장이 필수적이다.In particular, the continuous casting technology has recently increased the ratio of performance, improves the casting time ratio by increasing the size and casting of the cross section of the equipment in terms of equipment specifications, by reducing the preparation time and water purification time to become non-operation time Improved casting capacity In particular, it is essential to extend the life time to extend the water purification time.
연속주조용 몰드는 도 1 도시와 같이, 각각 2개의 장변(3)과 단변(2)으로 구성되어 있으며, 구조상 단변의 수명이 장변에 비하여 1/2 정도로 단축되므로 단변의 수명에 맞추어 몰드 교체가 이루어진다. 따라서, 몰드의 수명을 증대시키면 정수기간을 연장시켜 연주기의 전체적인 주조능력을 향상시킬 수 있는 것이다.As shown in Figure 1, the continuous casting mold is composed of two long sides (3) and short sides (2), and since the life of the short side is shortened to about 1/2 of the long side in structure, the mold replacement is performed according to the life of the short side. Is done. Therefore, increasing the life of the mold can extend the water purification period to improve the overall casting ability of the player.
도 1 에서는 손상된 몰드의 형상이 도시되고 있는데, 몰드 내에서 주조되는 셸(Shell)은 몰드 상부로부터 100㎜ 지점부터 형성되기 시작하여 몰드 하부로 가면서 점점 두꺼워지며, 셸의 경도도 증가하며, 주편의 내부 결함을 제거하기 위하여 일정한 테이퍼를 부여하고 있기 때문에 몰드 하부로부터 코팅층의 마모부위(5)가 발생하며, 부식부위(4)도 나타난다. (1)은 폭수축부를 나타낸다.In FIG. 1, the shape of the damaged mold is shown. The shell cast in the mold starts to form from 100 mm from the top of the mold and becomes thicker toward the bottom of the mold, and the hardness of the shell increases. Since a constant taper is applied to remove internal defects, the wear part 5 of the coating layer is generated from the bottom of the mold, and the corrosion part 4 also appears. (1) shows the width shrinkage part.
이와같은 몰드의 수명을 증가시키기 위하여 Ni 전기 도금을 몰드에 적용하고 있으며, 일본에서는 Ni-Co, Ni-B 등의 공석 도금을 이용하여 수명을 증가시키고 있다.In order to increase the life of such a mold, Ni electroplating is applied to the mold. In Japan, vacancy plating such as Ni-Co and Ni-B is used to increase the life.
최근에는 용사코팅 기술이 개발되어, 일본의 미시마 고산에서는 플라즈마 용사법을 이용하여 자용성 합금을 코팅한 후에 열처리에 의하여 밀착 강도와 내열, 충격성을 향상시킨 기술을 개발하여 실용화하고 있다.In recent years, a spray coating technique has been developed, and in Japan's Mishima Kosan, a coating technique has been developed and commercialized using plasma spraying to improve adhesion strength, heat resistance, and impact resistance.
또한, 수명을 더욱 향상시키기 위하여 초경 합금, 코발트계 합금을 이용한 새로운 코팅 기술도 개발되고 있다.In addition, a new coating technology using a cemented carbide, cobalt-based alloy is also being developed to further improve the life.
그러나 연주몰드에 사용되는 용사합금으로 고온 내마모성과 열응력에 대한 고인성을 함께 구비한 용사합금을 이용한 용사코팅 기술은 제시된 바가 없었다.However, there is no suggestion of a thermal spray coating technique using a thermal spray alloy having high temperature wear resistance and high toughness for thermal stress.
따라서, 본 발명에서는 연주몰드의 수명을 향상시키기 위한 용사합금으로 고온 내마모성과 고인성을 갖춘 연주몰드용 용사합금을 사용한 용사코팅 방법을제공함에 그 목적이 있다.Accordingly, an object of the present invention is to provide a thermal spray coating method using a thermal spraying alloy having a high temperature wear resistance and high toughness as a thermal spray alloy for improving the life of the performance mold.
도 1 은 손상된 연주몰드의 형상을 개략적으로 도시한 도면,1 is a view schematically showing the shape of a damaged playing mold,
도 2 는 본 발명의 연주몰드용 용사코팅을 위한 용사합금의 기계적 특성을 나타내는 도면,Figure 2 is a view showing the mechanical properties of the spray alloy for the spray coating for the molding of the present invention,
도 3 은 발명예와 비교예의 마모 깊이를 나타낸 도면,3 is a view showing the wear depth of the invention and comparative examples,
도 4 는 종래방법과 본 발명에 의한 코팅시의 내마모특성을 나타낸 도면이다.4 is a view showing the wear resistance of the coating method according to the conventional method and the present invention.
〈도면의 주요부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>
2: 단변 3: 장변 4;부식부위 5: 마모부위2: short side 3: long side 4; corrosion area 5: wear area
상기 목적을 달성하기 위한 본 발명의 고인성과 고온 내마모성을 갖춘 용사합금을 사용한 용사코팅 방법은, 크래드(Clad) 텅스텐 카바이드와 Co 계 용사합금을 2:8 ∼ 5:5 로 혼합하여 사용하는 것을 특징으로 하는 구성이다.In order to achieve the above object, the thermal spray coating method using the thermal spray alloy having high toughness and high temperature abrasion resistance of the present invention is to use a mixture of clad tungsten carbide and Co-based thermal spray alloy at 2: 8 to 5: 5. It is a characteristic structure.
이하에서는 양호한 실시예와 관련하여 본 발명을 상세하게 설명한다.Hereinafter, the present invention will be described in detail with reference to the preferred embodiments.
본 발명에서는 용사코팅층에 대해 특허출원 제 96-71107 호(96. 12. 24)에 개시된 바와 같은 굽힘 시험에 의한 기계적 특성 측정 시험을 실시한 바, 표 1 에 나타낸 바와같이, Co 계 용사합금(Co-25Cr-10Ni-7W-0.5C)이 고온 내마모성이 우수한 점에 착안하여 크래드 텅스텐 카바이드와 이를 혼합하여 고인성 폭발 용사합금에 고온 내마모성을 함께 부여하였다.In the present invention, the thermal spray coating layer was subjected to the mechanical property measurement test by the bending test as disclosed in Patent Application No. 96-71107 (96. 12. 24), as shown in Table 1, Co-based spray alloy (Co -25Cr-10Ni-7W-0.5C) was given the excellent high temperature wear resistance and mixed with the tungsten carbide to give the high toughness explosion spray alloy together with high temperature wear resistance.
고인성 폭발용사합금에 대해서는 이미 특허출원 제 97-74922호(97.12.27)에서 탄성영률이 우수한 크래드 형태의 텅스텐 카바이드와 파단강도가 우수한 금속이나 자용성 용사합금을 혼합하여 구성할 수 있음을 개시한 바 있는 바, 이러한 고인성 폭발용사합금에 고온 내마모성이 우수한 Co 계 용사합금을 혼합하여 본 발명에서는 연속주조용 몰드의 용사 코팅에 사용하는 것이다.For high toughness explosion spray alloy, patent application 97-74922 (97.12.27) can be made by mixing tungsten carbide with excellent Young's modulus and metal with high breaking strength or insoluble thermal spray alloy. As disclosed, the Co-spray alloy having excellent high temperature wear resistance is mixed with the high toughness explosion spray alloy and used in the spray coating of the continuous casting mold in the present invention.
본 발명에서는 크래드 텅스텐 카바이드(WC-20Co)와 Co계 용사합금을 2:8∼5:5 로 혼합한 용사합금을 사용하여 연주몰드의 용사코팅을 실시하는데, 이는 상기 범위로 혼합한 용사합금이 도 2 도시와 같이 우수한 기계적 특성을 보이기 때문이다.In the present invention, the thermal spray coating of the molten alloy is carried out using a thermal spray alloy in which a crazed tungsten carbide (WC-20Co) and a Co-based thermal spray alloy are mixed at a ratio of 2: 8 to 5: 5, which is mixed in the above range. This is because it shows excellent mechanical properties as shown in FIG.
즉, 도 2 도시와 같이, Co 계 용사합금의 첨가량에 따라 파단강도와 인성이 증가하며, 영률은 전반적으로 감소하고 있다.That is, as shown in Figure 2, the breaking strength and toughness increases with the addition amount of Co-based thermal spray alloy, the Young's modulus is generally reduced.
이중에서 40 중량%의 Co 계 용사합금을 첨가한 경우에 열응력에 대한 내구성과 인성이 우수한 용사합금을 얻을 수 있음을 알게 되었다.In the case of adding 40 wt% Co-based thermal spray alloy, it was found that the thermal spray alloy having excellent durability and toughness against thermal stress can be obtained.
산화량을 줄이기 위해 마찰 표면을 제외하고는 알루미나 산화물로 코팅을 하였으며 연주몰드의 표면온도인 400℃ 보다 가혹한 600℃에서 마찰계수와 마모량을 측정하는 내마모 시험을 상기 합금에 대해 실시한 결과 다음 표 2와 같았다. 동시에 비교를 위하여 종래 사용되는 여러 용사합금에 대해서도 내마모 시험을 실시하였다.In order to reduce the amount of oxidation, the coating was coated with alumina oxide except for the friction surface, and the wear resistance test was performed on the alloy at 600 ° C, which is harsher than the surface temperature of the casting mold, 400 ° C. It was like At the same time, abrasion resistance test was also performed on several conventionally used thermal spray alloys for comparison.
또한, 도 3 은 표 2 에 나타낸 각종 시험예의 경우 시간의 경과에 따른 마모깊이를 측정하여 나타낸 것인데, 측정 조건은 온도 600℃이다.In addition, FIG. 3 shows the wear depth measured over time in the case of various test examples shown in Table 2, and the measurement condition is a temperature of 600 ° C.
상기 표로부터 알 수 있는 바와같이, 비교예 1의 크래드 텅스텐카바이드(WC-20Co)로 코팅을 실시한 경우 가장 우수한 마모 특성을 나타내나 마찰계수가 우수하지 못하며 열응력에 취약한 특성을 나타낸다. 또한, 비교예 4의 구리합금을 혼합한 용사코팅의 경우 마찰계수는 우수하나 마모량이 불량하다.As can be seen from the table, when coated with the tungsten carbide (WC-20Co) of Comparative Example 1 shows the most excellent wear characteristics, but the coefficient of friction is not excellent and exhibits properties that are vulnerable to thermal stress. In addition, the thermal spray coating of the copper alloy of Comparative Example 4 is excellent in the coefficient of friction but poor wear.
이에 대해, 발명예의 본 발명에서와 같이 크래드 텅스텐카바이드와 Co계 용사합금을 혼합하여 용사코팅을 실시한 경우는 다른 비교예에 비해 마찰계수 및 마모량 면에서 모두 우수하다.On the contrary, when the thermal spray coating is performed by mixing the tungsten carbide and Co-based thermal spray alloys as in the present invention, the friction coefficient and the wear amount are superior in comparison with other comparative examples.
도 4 는 기존의 Ni 전기도금에 의한 코팅 형성시와 본 발명에 따라 용사코팅을 실시한 경우의 마모깊이를 측정하여 나타낸 것인데, 본 발명의 경우가 휠씬 우수함을 알 수 있다.Figure 4 shows the measurement of the wear depth when the coating is formed by conventional Ni electroplating and when the spray coating according to the present invention, it can be seen that the case of the present invention is much superior.
따라서, 상기 설명한 바와같이 본 발명에 따라 크래드 텅스텐카바이드와 Co계 용사합금을 혼합하여 용사코팅을 실시함으로써 고온 내마모성이 향상되어 연주 몰드의 수명을 연장시킬 수 있다.Therefore, as described above, the thermal spray coating may be performed by mixing the tungsten carbide and the Co-based thermal spray alloy in accordance with the present invention to improve the high temperature wear resistance, thereby extending the life of the playing mold.
Claims (2)
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| KR1019980054787A KR100347605B1 (en) | 1998-12-14 | 1998-12-14 | Spray coating method of performance mold using high temperature wear resistant spray alloy |
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| KR1019980054787A KR100347605B1 (en) | 1998-12-14 | 1998-12-14 | Spray coating method of performance mold using high temperature wear resistant spray alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200048161A (en) | 2018-10-29 | 2020-05-08 | 주식회사 포스코 | Mold and casting method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04346693A (en) * | 1991-05-22 | 1992-12-02 | Nittetsu Hard Kk | Conductor roll for electroplating |
| JPH09228071A (en) * | 1996-02-23 | 1997-09-02 | Nippon Steel Corp | Method for thermal spraying to casting mold for continuous casting and casting mold for continuous casting |
| KR19990055019A (en) * | 1997-12-27 | 1999-07-15 | 신현준 | High toughness explosion spray alloy method |
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1998
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04346693A (en) * | 1991-05-22 | 1992-12-02 | Nittetsu Hard Kk | Conductor roll for electroplating |
| JPH09228071A (en) * | 1996-02-23 | 1997-09-02 | Nippon Steel Corp | Method for thermal spraying to casting mold for continuous casting and casting mold for continuous casting |
| KR19990055019A (en) * | 1997-12-27 | 1999-07-15 | 신현준 | High toughness explosion spray alloy method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200048161A (en) | 2018-10-29 | 2020-05-08 | 주식회사 포스코 | Mold and casting method |
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