KR100590941B1 - Composition of powder-alloy for thermal spray coating of cylinder block - Google Patents

Composition of powder-alloy for thermal spray coating of cylinder block Download PDF

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KR100590941B1
KR100590941B1 KR1020040095498A KR20040095498A KR100590941B1 KR 100590941 B1 KR100590941 B1 KR 100590941B1 KR 1020040095498 A KR1020040095498 A KR 1020040095498A KR 20040095498 A KR20040095498 A KR 20040095498A KR 100590941 B1 KR100590941 B1 KR 100590941B1
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powder
spray coating
cylinder block
liner
alloy
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KR1020040095498A
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KR20060056177A (en
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오중석
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현대자동차주식회사
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    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C4/00Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06Metallic material
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C4/00Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/123Spraying molten metal

Abstract

본 발명은 자동차 알루미늄 실린더 블록의 용사코팅용 분말합금 조성물에 관한 것으로서, 더욱 상세하게는 Fe-12Cr-1.0Mn-1.0Si-0.2C의 철합금분을 주재로 하고 여기에 적정량의 몰리브덴(Mo) 분말과 Cr2O3 분말을 함유시킴으로써, 기존 주철재 라이너를 대체하기 위한 알루미늄 실린더 블록의 용사코팅재로 사용하는 경우 주철재 라이너에 비해 우수한 내마모 및 저마찰 특성을 가지는 코팅층을 형성할 수 있는 실린더 블록의 용사코팅용 분말합금 조성물에 관한 것이다.The present invention relates to a powder alloy composition for thermal spray coating of automotive aluminum cylinder block, and more specifically, based on the iron alloy powder of Fe-12Cr-1.0Mn-1.0Si-0.2C, and an appropriate amount of molybdenum (Mo) By containing powder and Cr 2 O 3 powder, when used as a spray coating material of aluminum cylinder block to replace the existing cast iron liner, a cylinder capable of forming a coating layer having excellent wear resistance and low friction characteristics compared to cast iron liner The present invention relates to a powder alloy composition for thermal spray coating of blocks.

실린더 블록, 용사코팅, 분말합금, 고내마모, 저마찰Cylinder block, thermal spray coating, powder alloy, high wear resistance, low friction

Description

실린더 블록의 용사코팅용 분말합금 조성물{Composition of powder-alloy for thermal spray coating of cylinder block} Composition of powder-alloy for thermal spray coating of cylinder block

본 발명은 자동차 알루미늄 실린더 블록의 용사코팅용 분말합금 조성물에 관한 것으로서, 더욱 상세하게는 Fe-12Cr-1.0Mn-1.0Si-0.2C의 철합금분을 주재로 하고 여기에 적정량의 몰리브덴(Mo) 분말과 Cr2O3 분말을 함유시킴으로써, 기존 주철재 라이너를 대체하기 위한 알루미늄 실린더 블록의 용사코팅재로 사용하는 경우 주철재 라이너에 비해 우수한 내마모 및 저마찰 특성을 가지는 코팅층을 형성할 수 있는 실린더 블록의 용사코팅용 분말합금 조성물에 관한 것이다.The present invention relates to a powder alloy composition for thermal spray coating of automotive aluminum cylinder block, and more specifically, based on the iron alloy powder of Fe-12Cr-1.0Mn-1.0Si-0.2C, and an appropriate amount of molybdenum (Mo) By containing powder and Cr 2 O 3 powder, when used as a spray coating material of aluminum cylinder block to replace the existing cast iron liner, a cylinder capable of forming a coating layer having excellent wear resistance and low friction characteristics compared to cast iron liner The present invention relates to a powder alloy composition for thermal spray coating of blocks.

일반적으로, 실린더 블록은 엔진의 본체 역할을 하는 중요 부품으로 다양한 기능을 가지고 있으며, 그 중 가장 중요한 기능은 피스톤이 왕복운동을 하는 공간을 제공하면서 연소실을 구성하는 것이다. In general, the cylinder block is an important part that serves as the main body of the engine and has a variety of functions, the most important of which is to configure the combustion chamber while providing a space for the piston to reciprocate.

대부분의 가솔린 및 디젤 엔진의 경우 주철 주물로 제작하여 사용중이나, 최근 자동차에 대한 저연비, 배기가스 저감 등 환경친화적인 요구에 부응하기 위하여 각 자동차 메이커들은 신소재, 특히 기존의 주철재를 사용하는 대신 알루미늄 합금의 채택을 적극 추진 중이며, 향후 개발하는 가솔린 엔진은 모두 알루미늄 블록으로 개발하고 있는 추세이다. Most gasoline and diesel engines are made of cast iron castings, but in order to meet environmentally-friendly demands such as low fuel consumption and reduced emissions for automobiles in recent years, automakers are using aluminum instead of using new materials, especially cast iron. Adoption of alloys is being actively pursued, and gasoline engines to be developed in the future are all being developed with aluminum blocks.

알루미늄 블록은 경량화, 냉각성능 등의 측면에서는 주철 블록보다 훨씬 유리하여 연비나 배기가스 저감 등의 측면에서 많은 장점을 가지고 있으나, 강도나 내마모성 등이 주철과 비교할 때 불리하여, 피스톤이 왕복운동을 하는 공간은 알루미늄 합금 상태로 사용하지 못하고, 내마모성이 뛰어난 주물재 라이너(liner)를 삽입하여 사용한다. Aluminum blocks are much more advantageous than cast iron blocks in terms of weight reduction and cooling performance, but have many advantages in terms of fuel efficiency and exhaust gas reduction. However, strength and abrasion resistance are disadvantageous compared to cast iron. The space cannot be used in the state of aluminum alloy, and is used by inserting a casting material liner having excellent wear resistance.

주물재 라이너를 삽입하는 방식은 기계적으로 압입하는 방식과 주조 금형에 조립하여 일체로 주조하는 방식이 있는데, 두 방식 모두 라이너와 블록의 밀착성에 대한 신뢰성 문제가 있으며, 냉각 특성의 저하 및 주철 라이너에 의한 경량화 효과 감소 등이 문제점으로 지적되고 있다. There are two methods of inserting a cast material liner: mechanically press-fitting and assembling integrally by casting in a casting mold. Both methods have a reliability problem of adhesion between the liner and the block. It is pointed out as a problem such as a reduction in weight reduction effect.

따라서, 이러한 문제점들을 해소하기 위하여 다양한 방법들이 시도되고 있으나, 그 방법들 역시 또 다른 문제점들을 안고 있는 바, 예를 들면, 경량화 및 내마모성을 동시에 만족시킬 수 있는 고내마모성 알루미늄 합금을 개발하여 주물 라이너를 대체하려는 시도가 있었으나, 이를 적용할 경우, 우선 경제적인 측면에서 불리하고, 또한 연소시 부산물로 생기는 황화합물에 의한 알루미늄 라이너의 내식성 문제, 주물보다 강도가 떨어지기 때문에 치수를 보강함에 따라 엔진의 전체적인 사이즈가 커져 엔진룸 내의 레이 아웃(lay-out)을 조정해야 하는 문제 등이 발생하게 된다.Therefore, various methods have been tried to solve these problems, but the methods also have other problems, for example, by developing a high wear resistant aluminum alloy capable of satisfying light weight and wear resistance at the same time. There have been attempts to replace it, but if applied, it is economically disadvantageous and also the corrosion resistance of aluminum liners due to sulfur compounds generated as byproducts during combustion, and the overall size of the engine as it is strengthened due to its lower strength than castings. As a result, the problem of having to adjust the layout (lay-out) in the engine room occurs.

그리고, 알루미늄 라이너 소재 및 내경부 에칭(etching)에 따른 요소 기술의 개발 등이 제약으로 작용하는 문제점이 있다. In addition, there is a problem that the development of the element technology according to the aluminum liner material and the inner diameter etching (etching) and the like act as a constraint.

아울러, 기존 주철재 라이너를 대체하기 위하여, 실린더 블록의 보어 구성면에 코팅재 분말을 고온의 열원으로 용융시키면서 고속 분사하여 실린더 보어 구성면에 충돌시켜 피막을 형성하는 방법이 있다.In addition, in order to replace the existing cast iron liner, there is a method of forming a coating by colliding with the cylinder bore component surface by high-speed injection while melting the coating material powder on the bore component surface of the cylinder block with a high temperature heat source.

여기서, 종래 코팅재 분말로는 Fe-50%Mo의 철합금분이 사용되고 있으나, 이는 내부식성이 약하고, 특히 디젤엔진에서 황화합물에 의한 내식성이 좋지 못하다.Here, as a conventional coating material powder, Fe-50% Mo iron alloy powder is used, but it is poor in corrosion resistance, in particular, the corrosion resistance by sulfur compounds in a diesel engine is not good.

따라서, 본 발명은 상기와 같은 문제점을 해결하기 위하여 발명한 것으로서, 자동차 알루미늄 실린더 블록의 보어 구성면에 용사코팅하는 경우 기존 주철재 라이너를 대체할 수 있고, 주철재 라이너에 비해 우수한 내마모 및 저마찰 특성을 가지는 코팅층을 형성할 수 있으며, 라이너를 대체하는 상기 코팅층에 의해 라이너가 삭제되면서 라이너 삽입에 따른 종래 여러 문제점들을 해소할 수 있는 실린더 블록의 용사코팅용 분말합금 조성물을 제공하는데 그 목적이 있다.
Therefore, the present invention has been invented to solve the above problems, it can replace the existing cast iron liner when the thermal spray coating on the bore configuration surface of the automotive aluminum cylinder block, excellent wear resistance and low friction than the cast iron liner It is an object of the present invention to provide a powder alloy composition for thermal spray coating of a cylinder block which can form a coating layer having characteristics and can eliminate various problems caused by liner insertion while the liner is deleted by the coating layer replacing the liner. .

이하, 본 발명을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail.

본 발명은, 몰리브덴(Mo) 분말 30 내지 50 중량%, Cr2O3 분말 5 내지 10 중 량% 및 잔량의 Fe-12Cr-1.0Mn-1.0Si-0.2C의 철합금분을 포함하는 것을 특징으로 한다.The present invention is characterized in that it comprises 30 to 50% by weight of molybdenum (Mo) powder, 5 to 10% by weight of Cr 2 O 3 powder and the remaining amount of Fe-12Cr-1.0Mn-1.0Si-0.2C iron alloy powder. It is done.

특히, 상기 Fe-12Cr-1.0Mn-1.0Si-0.2C의 철합금분은 분말 입도 15 ~ 45㎛인 것을 사용하고, 상기 몰리브덴(Mo) 분말 및 Cr2O3 분말은 분말 입도 45 ~ 75㎛인 것을 사용하는 것을 특징으로 한다.In particular, the iron alloy powder of Fe-12Cr-1.0Mn-1.0Si-0.2C is used in the powder particle size of 15 ~ 45㎛, the molybdenum (Mo) powder and Cr 2 O 3 powder powder 45 ~ 75㎛ It is characterized by using the thing.

이하, 본 발명을 더욱 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail.

본 발명은 고내마모성과 저마찰 특성을 가지는 코팅층을 형성할 수 있는 자동차 알루미늄 실린더 블록의 용사코팅용 분말합금 조성물로서, 특히 Fe-12Cr-1.0Mn-1.0Si-0.2C의 철합금분에 적정량의 몰리브덴(Mo) 분말과 Cr2O3 분말을 혼합하여 구성된 것이다.The present invention is a powder alloy composition for spray coating of automotive aluminum cylinder block capable of forming a coating layer having a high wear resistance and low friction characteristics, in particular an appropriate amount of iron alloy powder of Fe-12Cr-1.0Mn-1.0Si-0.2C It is composed by mixing molybdenum (Mo) powder and Cr 2 O 3 powder.

여기서, 용사코팅은 주철재 블록 및 라이너 삽입 블록의 여러 문제점들을 동시에 해결할 수 있는 유일한 방안으로서, 이는 알루미늄 실린더 블록에 라이너를 삽입하는 것 대신, 실린더 블록의 보어 구성면에 엔진의 고압, 고온 등의 사용환경에 따른 여러 가지 기계적 특성을 충족하는 코팅재 분말을 고온의 열원으로 용융시키면서 고속 분사하여 실린더 보어 구성면에 충돌시켜 피막을 형성하는 방식이다.Here, the spray coating is the only way to solve the problems of the cast iron block and the liner insertion block at the same time, which is to use the high pressure, high temperature, etc. of the engine on the bore configuration of the cylinder block instead of inserting the liner in the aluminum cylinder block It is a method of forming a coating by colliding with a cylinder bore structure surface by spraying a high speed while melting the coating material powder satisfying various mechanical properties according to the environment with a high temperature heat source.

이러한 용사코팅의 방식을 적용하게 되면, 기존의 주철재 라이너 삽입 방식 대비 라이너 자체가 없어지기 때문에 경량화의 장점 제공과 함께 라이너와 블록의 밀착성 문제 등이 자연히 해결되며, 주물과 달리 부품의 요구 특성을 맞추기 위해 원하는 조성을 자유롭게 할 수 있어 내마모성 및 내식성 등에 대응이 용이하다.When the spray coating method is applied, the liner itself is eliminated as compared to the existing cast iron liner inserting method, thereby providing the advantages of light weight and naturally solving the problem of adhesion between the liner and the block. The desired composition can be freely matched to facilitate abrasion resistance and corrosion resistance.

또한, 라이너 삽입 방식의 경우 라이너의 두께와 라이너를 지지하기 위한 보어간 거리 등 최소한의 두께를 확보해야 하는데, 이로 인해 엔진룸 전체의 레이아웃에 여유가 적어지고, 심한 경우에는 엔진의 배기량 별로 실린더 블록의 길이를 달리해야 함에 따른 설비투자(블록의 길이가 달라지면 생산 가공 라인을 공용화 하지 못함) 문제 등이 발생하나, 용사코팅의 방식을 적용하게 되면 이러한 문제들을 해결할 수 있다.In addition, in the case of the liner insertion method, a minimum thickness such as the thickness of the liner and the distance between the bores for supporting the liner should be secured. As a result, the layout of the entire engine room is reduced, and in severe cases, the cylinder block for each engine displacement There is a problem of facility investment due to the different length of the block (the production length of the block cannot be shared when the length of the block is changed), but the problem can be solved by applying the spray coating method.

본 발명은 알루미늄 실린더 블록의 보어 구성면에 적용하여 기존 주철재 라이너를 대체하기 위한 용사코팅재 조성물로서, Fe-12Cr-1.0Mn-1.0Si-0.2C의 철합금분에 Mo 및 Cr2O3 분말을 적정량 첨가하여 우수한 내마모 및 저마찰 특성을 이루도록 하였다.The present invention is a spray coating material composition for replacing the existing cast iron liner by applying to the bore configuration surface of the aluminum cylinder block, Mo and Cr 2 O 3 powder in the iron alloy powder of Fe-12Cr-1.0Mn-1.0Si-0.2C Appropriate amount was added to achieve excellent wear and low friction characteristics.

여기서, 상기 Mo 분말과 Cr2O3 분말은 실린더 보어의 가장 중요한 요구 특성인 내마모성을 부여하기 위하여 첨가하는 것으로, Mo 분말의 경우 99% 이상의 순도로 30 ~ 50 중량%를 첨가하고, Cr2O3 분말의 경우 5 ~ 10 중량%를 첨가한다.Here, the Mo powder and Cr 2 O 3 powder is added to give abrasion resistance which is the most important characteristic of the cylinder bore, in the case of Mo powder is added to 30 to 50% by weight with a purity of 99% or more, Cr 2 O For powder 3 add 5 to 10% by weight.

여기서, Mo 분말의 첨가량을 30 중량% 미만으로 할 경우 충분한 내마모 특성을 얻을 수 없게 되고, 50 중량%를 초과하여 첨가하는 경우 경제적이지 못한 문제가 있게 된다.In this case, when the amount of the Mo powder added is less than 30% by weight, sufficient abrasion resistance may not be obtained, and when added in excess of 50% by weight, there is a problem in that it is not economical.

또한, Cr2O3 분말의 첨가량을 5 중량% 미만으로 할 경우 마모량이 많아지고, 10 중량%를 초과하여 첨가하는 경우 상대재 공격성이 커지므로 바람직하지 않다.In addition, when the addition amount of the Cr 2 O 3 powder is less than 5% by weight, the amount of wear increases, and when it is added in excess of 10% by weight, the relative material attackability becomes large, which is not preferable.

그리고, 상기 철합금분은 분말 입도가 14 ~ 45㎛인 것이 바람직하고, Mo 분 말과 Cr2O3 분말의 경우 분말 입도가 45 ~ 75㎛인 것이 바람직하다.In addition, the iron alloy powder preferably has a powder particle size of 14 to 45 μm, and in the case of Mo powder and Cr 2 O 3 powder, it is preferable that the powder particle size is 45 to 75 μm.

여기서, 분말 입도가 14㎛ 미만인 철합금분의 경우 용사시 비산(飛散)되어 정상적인 코팅층 형성이 어려우며, 45㎛ 초과인 철합금분의 경우 조직 치밀화에 불리한 역할을 하는 문제가 있다.Here, in the case of iron alloy powder having a particle size of less than 14㎛ scattered during spraying it is difficult to form a normal coating layer, iron alloy powder of more than 45㎛ has a problem that plays a disadvantageous role in tissue densification.

또한, Mo 분말과 Cr2O3 분말의 경우, 분말 입도 45㎛ 미만의 것은 분말 유입시 흐름성이 저하되는 문제가 있으므로 바람직하지 않고, 75㎛를 초과하는 것은 코팅층 기공 형성 및 미용융이 발생하는 문제가 있으므로 바람직하지 않다.In addition, in the case of Mo powder and Cr 2 O 3 powder, the powder particle size of less than 45㎛ is not preferable because there is a problem that the flowability when the powder inflow, it is not preferable, the exceeding 75㎛ is a problem that the coating layer pore formation and unmelting occurs It is not desirable because there is.

또한, 내식성에 도움을 주는 Cr 성분을 별도로 혼합시에 편석이 생길 수 있는 바, 이와 같이 편석이 생기는 것을 방지하기 위하여, 본 발명에서는 Cr 성분을 함유한 합금화된 분말, 즉 Fe-12Cr-1.0Mn-1.0Si-0.2C의 철합금분을 사용한다.In addition, since segregation may occur when the Cr component which helps the corrosion resistance is separately mixed, in order to prevent segregation in this way, in the present invention, an alloyed powder containing Cr component, that is, Fe-12Cr-1.0Mn Iron alloy powder of -1.0 Si-0.2C is used.

이와 같이 하여, 본 발명에 따른 용사코팅용 분말합금 조성물을 자동차 알루미늄 실린더 블록의 보어 내주면에 용사코팅하는 경우, 주철재 라이너를 삽입함에 따른 기존의 여러 문제점들을 해결할 수 있고, 특히 주철재 라이너에 비해 우수한 내마모 및 저마찰 특성을 가지는 코팅층을 형성할 수 있게 된다. In this way, when the thermal spray coating powder coating composition for spray coating on the bore inner circumferential surface of the automotive aluminum cylinder block, it is possible to solve a number of existing problems by inserting a cast iron liner, in particular compared to cast iron liner It is possible to form a coating layer having excellent wear resistance and low friction characteristics.

이러한 본 발명의 용사코팅재 조성물을 사용하여 기존 라이너를 대체하는 코팅층을 형성함에 있어서 플라즈마 용사코팅의 방법이 이용될 수 있으며, 이때 용사층의 두께는 대략 150 ~ 200㎛ 정도로 한다. In forming the coating layer to replace the existing liner using the thermal spray coating material composition of the present invention can be used a method of plasma spray coating, wherein the thickness of the thermal spraying layer is approximately 150 ~ 200㎛.

이하, 본 발명을 실시예에 의거 상세히 설명하겠는 바, 본 실시예는 본 발명을 상세히 설명하기 위한 예시이며, 실시예에 의해 본 발명이 한정되는 것은 아니 다. Hereinafter, the present invention will be described in detail with reference to Examples, but the present Examples are illustrative for describing the present invention in detail, and the present invention is not limited by the Examples.

실시예 1 내지 3 및 비교예 1 내지 4Examples 1 to 3 and Comparative Examples 1 to 4

본 발명에서 제시한 용사코팅용 분말합금을 사용하여 플라즈마 용사코팅을 실시하였으며, 용사재의 마찰 특성을 평가하기 위하여 시편으로 제작한 후 마모 시험을 실시하였다. Plasma spray coating was carried out using the powder coating for thermal spray coating proposed in the present invention, and a wear test was performed after fabricating the specimen to evaluate the friction characteristics of the thermal spraying material.

여기서, 용사코팅은 철합금분에 다음의 표 1과 같이 Mo 분말과 Cr2O3 분말의 조성을 변화시켜 Al소재에 플라즈마 방식으로 실시하였으며, 각 조성에 따른 마찰 특성의 차이를 분석하고, 이를 주철재와 비교하였다. Here, the spray coating was performed on the Al alloy by changing the composition of the Mo powder and Cr 2 O 3 powder in the plasma method as shown in Table 1 below, and analyzed the difference in friction characteristics according to each composition, and this Compared with iron.

마모 시험은 핀-온-디스크(Pin-On-Disc)방식으로 작용하중 10kgf, 회전수 500RPM, 윤활유 SAE10W30을 사용하여 3시간 시험하여 마찰계수와 마모량을 측정하였으며, 디스크 표면에 용사코팅하였고, 핀의 재질은 피스톤 링과 동일한 질화 처리한 강을 사용하였다. The wear test was carried out using a pin-on-disc method with a working load of 10 kgf, a rotational speed of 500 RPM and a lubricating oil SAE10W30 for 3 hours to measure the coefficient of friction and the amount of abrasion. The material of was made of the same nitrided steel as the piston ring.

다음의 표 1은 마모 시험의 결과를 나타낸 것으로서, Mo 양이 많아질수록 마모량은 감소하나 마찰계수가 증가하고, Cr2O3 양이 많아지면 상대 핀에 대한 공격성이 커져 마모량이 많아짐을 보여주고 있다.Table 1 shows the results of the abrasion test. As the amount of Mo increases, the amount of wear decreases, but the friction coefficient increases, and when the amount of Cr 2 O 3 increases, the amount of wear increases due to the increased aggression against the mating pin. have.

Figure 112004054142329-pat00001
Figure 112004054142329-pat00001

표 1에서와 같이, 본 발명에서 제시한 조성 및 함량의 코팅재를 사용한 실시예가 모두 기존 주철재 라이너에 비해 우수한 내마모 및 저마찰 특성을 가짐을 알 수 있었다. As shown in Table 1, it can be seen that the examples using the coating material of the composition and content presented in the present invention all have excellent wear resistance and low friction characteristics compared to the existing cast iron liner.

그리고, 비교예 1과 비교예 2의 경우 본 발명이 제시하는 것에 비하여 Mo 또는 Cr2O3의 양을 적게 사용함으로써, 실시예 보다 디스크 마모량이 현저히 많았다. In the case of Comparative Example 1 and Comparative Example 2, the amount of disk wear was significantly higher than that of the Example by using less Mo or Cr 2 O 3 than in the present invention.

또한, 비교예 3의 경우 Cr2O3의 양을 본 발명이 제시하는 것에 비하여 많게 사용함으로써, 상대 핀에 대한 공격성이 커져 핀 마모량이 현저히 많음을 알 수 있었다.In addition, in the case of Comparative Example 3, by using more Cr 2 O 3 than the present invention, it was found that the aggression against the mating pin is increased, the pin wear amount is remarkably large.

이상에서 설명한 바와 같이, 본 발명의 조성물을 기존 주철재 라이너를 대체하기 위한 알루미늄 실린더 블록의 용사코팅재로 사용하는 경우 주철재 라이너에 비해 우수한 내마모 및 저마찰 특성을 가지는 코팅층을 형성할 수 있다.As described above, when the composition of the present invention is used as a spray coating material of the aluminum cylinder block to replace the existing cast iron liner, it is possible to form a coating layer having excellent wear resistance and low friction characteristics compared to the cast iron liner.

또한, 본 발명의 조성물을 용사코팅재로 사용하여 기존 주철재 라이너를 대체할 수 있게 됨으로써, 라이너 삭제에 의한 경량화의 장점이 제공되고, 라이너와 블록의 밀착성 문제가 자연히 해결되며, 기존 라이너 삽입 방식이 가지는 실린더 블록 및 엔진룸의 레이아웃 제약 등 문제가 해결될 수 있다.In addition, by using the composition of the present invention as a thermal spray coating material to replace the existing cast iron liner, it provides the advantages of light weight by deleting the liner, the problem of adhesion between the liner and the block is naturally solved, and the existing liner insertion method Branches can be solved such as cylinder block and layout constraints of the engine room.

Claims (2)

몰리브덴(Mo) 분말 30 내지 50 중량%, Cr2O3 분말 5 내지 10 중량% 및 잔량의 Fe-12Cr-1.0Mn-1.0Si-0.2C의 철합금분을 포함하는 것을 특징으로 하는 실린더 블록의 용사코팅용 분말합금 조성물.30 to 50% by weight of molybdenum (Mo) powder, 5 to 10% by weight of Cr 2 O 3 powder and the remaining amount of Fe-12Cr-1.0Mn-1.0Si-0.2C iron alloy powder Powder alloy composition for thermal spray coating. 청구항 1에 있어서, The method according to claim 1, 상기 Fe-12Cr-1.0Mn-1.0Si-0.2C의 철합금분은 분말 입도 15 ~ 45㎛인 것을 사용하고, 상기 몰리브덴(Mo) 분말 및 Cr2O3 분말은 분말 입도 45 ~ 75㎛인 것을 사용하는 것을 특징으로 하는 실린더 블록의 용사코팅용 분말합금 조성물.The iron alloy powder of Fe-12Cr-1.0Mn-1.0Si-0.2C is used having a powder particle size of 15 ~ 45㎛, and the molybdenum (Mo) powder and Cr 2 O 3 powder has a powder particle size of 45 ~ 75㎛ Powder alloy composition for the spray coating of the cylinder block, characterized in that used.
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WO2002024970A2 (en) 2000-09-21 2002-03-28 Federal-Mogul Burscheid Gmbh Thermally applied coating for piston rings, consisting of mechanically alloyed powders

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Publication number Priority date Publication date Assignee Title
WO2002024970A2 (en) 2000-09-21 2002-03-28 Federal-Mogul Burscheid Gmbh Thermally applied coating for piston rings, consisting of mechanically alloyed powders

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100878878B1 (en) 2007-06-14 2009-01-15 주식회사뉴테크 Coating method of engine block liner outside using thermal spray technology

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