KR20070112287A - Gas shuttle valve provided with an anti-corrosive layer - Google Patents

Gas shuttle valve provided with an anti-corrosive layer Download PDF

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KR20070112287A
KR20070112287A KR1020077023714A KR20077023714A KR20070112287A KR 20070112287 A KR20070112287 A KR 20070112287A KR 1020077023714 A KR1020077023714 A KR 1020077023714A KR 20077023714 A KR20077023714 A KR 20077023714A KR 20070112287 A KR20070112287 A KR 20070112287A
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valve
cone
layer
nitride
nitride layer
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KR1020077023714A
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Korean (ko)
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안야 뤼페르트
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맨 비앤드더블유 디젤 악티엔게젤샤프트
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/32—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for rotating lift valves, e.g. to diminish wear
    • 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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
    • F01L3/04—Coated valve members or valve-seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/06—Valve members or valve-seats with means for guiding or deflecting the medium controlled thereby, e.g. producing a rotary motion of the drawn-in cylinder charge
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Lift Valve (AREA)

Abstract

The invention relates to a gas shuttle valve for an internal combustion engine comprising a valve cone which substantially consists of a valve shaft projected in a valve disc in such a way that a hollow cone is formed. The valve cone or at least the shaft thereof is made of a typical valve steel consisting of a nitride forming base alloy up to the hollow cone area. The aim of said invention is to improve said gas shuttle valve in such a way that even the parts made of the typical valve steel exhibit a good anti-corrosive protection. For this purpose, the valve cone is provided at least partial area with an anti-corrosive layer in the form of a nitride layer, which is produced by the nitride forming base alloy conversion by plasma nitriding or plasma nitrocarburising in a nitrogenous atmosphere.

Description

내식층을 갖는 가스 교환 밸브{GAS SHUTTLE VALVE PROVIDED WITH AN ANTI-CORROSIVE LAYER}GAS SHUTTLE VALVE PROVIDED WITH AN ANTI-CORROSIVE LAYER}

본 발명은, 중공형 콘을 형성하고 밸브 디스크로 이어지는 밸브 샤프트로 실질적으로 형성된 밸브콘(valve cone)을 갖는 내연 기관의 가스 교환 밸브에 관한 것이다.The present invention relates to a gas exchange valve of an internal combustion engine having a valve cone which forms a hollow cone and is substantially formed by a valve shaft leading to a valve disc.

가스 교환 밸브, 즉 내연 기관의 가스 채널을 개폐하는 유입 및 유출 밸브는 큰 기계적 및 열적 변형을 일으키고 연소 가스에 의해 부식 공격을 받는다. 높은 내열성과 양호한 내(耐)스케일성의 고합금강만이 특히 유출 밸브의 변형에 대항할 수 있다.Gas exchange valves, ie inlet and outlet valves that open and close gas channels of internal combustion engines, cause large mechanical and thermal deformations and are subject to corrosion attacks by combustion gases. Only high alloy steels with high heat resistance and good scale resistance can resist the deformation of the outlet valve, in particular.

그러한 가스 교환 밸브의 작동 수명을 증가시키기 위한 여러 가지 방법이 이미 공지되어 있다. 따라서, 예컨대 밸브 디스크는 밀봉면 상에서 특히 내CrNi 합금을 사용하여 보강된다. Various methods are already known for increasing the operating life of such gas exchange valves. Thus, for example, the valve disc is reinforced on the sealing face, in particular using a CrNi alloy.

DE 43 41 811 A1에서 제안한 바와 같이, 예컨대 전술한 보강에 추가하여, 밸브 샤프트에 부착되는 프로펠러 형태의 회전 디바이스에 의해 고도로 변형되는 엔진에서 유출 밸브의 작동 수명을 몇배로 증가시킬 수 있다. 프로펠러를 작동시키는 유출 배기 가스로 인한 강제 회전에 의해, 밸브 샤프트 단부와 디스크는 침적물 이 없는 상태로 유지되고, 일면 가열이 디스크의 누설을 야기할 수 없다.As suggested in DE 43 41 811 A1, for example, in addition to the reinforcement described above, it is possible to increase the operating life of the outlet valve several times in engines which are highly deformed by means of a propeller-type rotating device attached to the valve shaft. By forced rotation due to the effluent exhaust gas actuating the propellers, the valve shaft ends and the disc remain free of deposits, and heating on one side cannot cause the disc to leak.

그러나, 가스 교환 밸브의 다른 부분은 열, 피로 및 내식성에 대한 다양한 요건을 필요로 한다.However, other parts of the gas exchange valve require different requirements for heat, fatigue and corrosion resistance.

다양한 온도 구역의 밸브콘의 열, 피로 및 내식성에 대한 상이한 요건은, 밸브 디스크가 내열성 및 내연성 재료로 형성되고, 프로펠러를 포함하는 밸브 샤프트가 낮은 노치 감도와 높은 내피로성, 즉 이 영역에서 발생하는 굴곡 응력을 상쇄시키기에 충분한 인성을 갖는 물질로 이루어진다는 점을 고려하는 것으로 알려져 있다. 통상적인 밸브 강, 또는 NiCr2OTiAl과 같은 초합금으로 이루어진 물질은 밸브 디스크를 위해 사용하는 것이 바람직하고, X45CrSi9 -3과 같은 통상적인 밸브 강으로 이루어진 물질은 프로펠러를 포함하는 밸브 샤프트를 위해 사용하는 것이 바람직하다. 이것은 부식을 방지하기 위해 사용되는 니켈을 주성분으로 하는 합금으로 이루어진 강이 매우 고가여서, 가스 교환 밸브는 허용 가능한 X45CrSi9 -3과 같은 통상적인 밸브 강으로 널리 제조되기 때문이다.Different requirements for the heat, fatigue and corrosion resistance of valve cones in various temperature zones are such that valve valves are formed of heat and flame resistant materials and valve shafts comprising propellers have low notch sensitivity and high fatigue resistance, i.e. It is known to take into account that it is made of a material having sufficient toughness to counteract flexural stress. Materials of conventional valve steel, or superalloys such as NiCr 2 OTiAl, are preferably used for valve discs, and materials of conventional valve steel, such as X 45 CrSi 9 -3 , for valve shafts including propellers. It is preferable to use. This is very expensive for steel made of nickel-based alloys used to prevent corrosion, so that gas exchange valves are conventional valves such as the acceptable X 45 CrSi 9 -3. Because it is widely manufactured in steel.

또한, 가스 교환 밸브의 다른 양태는 연소 가스의 온도가 엔진 정지중에 이슬점 아래로 하강하기 때문에 밸브 샤프트와 중공형 콘이 습식 부식(응결)에 의해 공격을 받는 것을 포함한다는 것도 이미 알려져 있다.It is also already known that other aspects of the gas exchange valve include that the valve shaft and the hollow cone are attacked by wet corrosion (condensation) because the temperature of the combustion gas drops below the dew point during engine shutdown.

그러나, 질화물 형성 강에서의 플라즈마 질화(plasma nitration) 또는 플라즈마 질화 침탄(plasma nitro-carburization) 형태의 경화 방법은 이미 공지되어 있다.However, methods of curing in the form of plasma nitration or plasma nitro-carburization in nitride forming steels are already known.

일반적으로, 플라즈마 질화/플라즈마 질화 침탄은 강제(鋼製) 표면층의 경화로 이해되며, 질소 및/또는 탄소 원자는 얇은 표면층에서 확산하고 철과 반응하여 질화물 및/또는 탄소 질화물, 즉 접합층(VS)을 형성한다. 인접 확산층(DS)에서, 질소는 우선 냉각시에 질화물로서 부분적으로 응결된 후, 경도가 증가하게 된다. 자체 경도는 질화물 타입에 좌우된다. 질화 시간과 질화층들은 질소가 강과 어떻게 반응하는지에 따라 다르다. 즉, 경도, 내마모성, 피로 강도 또는 내식성을 증가시키기 위한, 물질로 이루어진 경계층의 질소에 의한 확산 포화(diffusion saturation)가 있다. 경계층은 외부 질화물 및/또는 탄소 질화물층(접합층)과, 질화/질화 침탄후의 응결된 질화물과 질소가 농후한 혼합형 결정으로 이루어진 인접층(확산층)을 포함한다.In general, plasma nitriding / plasma nitriding carburization is understood as the hardening of a steel surface layer, where nitrogen and / or carbon atoms diffuse in a thin surface layer and react with iron to form nitrides and / or carbon nitrides, ie junction layers (VS). ). In the adjacent diffusion layer DS, nitrogen first partially condenses as nitride upon cooling and then increases in hardness. Its hardness depends on the type of nitride. Nitriding times and nitride layers depend on how nitrogen reacts with the steel. That is, there is diffusion saturation with nitrogen of the boundary layer made of a material to increase hardness, wear resistance, fatigue strength or corrosion resistance. The boundary layer comprises an outer nitride and / or carbon nitride layer (bonding layer) and an adjacent layer (diffusion layer) composed of mixed crystals rich in condensed nitride and nitrogen after nitriding / nitriding carburization.

질화 시간은 글로우 방전(glow discharge), 소위 플라즈마 질화(450 내지 550 ℃에서의 플라즈마 질화)에 의한 질소의 이온화에 의해 단축될 수 있다.The nitriding time can be shortened by the ionization of nitrogen by glow discharge, so-called plasma nitriding (plasma nitriding at 450 to 550 ° C.).

처리제가 질소뿐만 아니라 탄소를 배출하는 성분도 함유하는 질화 침탄에 있어서, 질화 침탄은 파우더, 염 욕조, 가스 또는 플라즈마(500 내지 590 ℃, 바람직하게는 약 520 ℃에서의 플라즈마 질화 침탄)에서 실시될 수 있다. In nitriding carburization, in which the treatment agent contains not only nitrogen but also carbon constituents, nitriding carburization can be carried out in powder, salt bath, gas or plasma (plasma nitriding carburization at 500 to 590 ° C., preferably at about 520 ° C.). have.

이에 기초하여, 본 발명의 목적은 초기에 설명한 전형적인 밸브 강을 포함하는 부품이 양호한 내식성도 갖게 형성된 종류의 가스 교환 밸브를 개량하는 것이다.On the basis of this, it is an object of the present invention to improve a gas exchange valve of the kind in which a component comprising the typical valve steel described earlier also has good corrosion resistance.

이러한 목적은 상기 종류에 따른 타입의 가스 교환 밸브를 위한 청구항 1의 특징을 구현하는 것에 의해 달성된다.This object is achieved by implementing the features of claim 1 for a gas exchange valve of the type according to the kind.

가스 교환 밸브의 밸브체가 일체형으로 구현되고, 밸브 디스크가 전술한 밀봉면 및/또는 안착 영역 상에서 보강되는 경우, 질화물 및/또는 탄소 질화물층이 밸브 샤프트와 중공형 콘 상에서 보강된 밀봉면까지 완전히 제공되는 것이 바람직하다.If the valve body of the gas exchange valve is embodied in one piece and the valve disc is reinforced on the sealing surface and / or seating area described above, the nitride and / or carbon nitride layer is provided completely up to the sealing surface reinforced on the valve shaft and hollow cone. It is desirable to be.

하나의 도면에 기초하여 본 발명을 설명한다.The present invention will be described based on one drawing.

도 1은 본 발명에 따른 가스 교환 밸브를 도시한 도면이다.1 is a view showing a gas exchange valve according to the present invention.

가스 교환 밸브, 특히 내연 기관용 유출 밸브(1)는 밸브 샤프트(2) 상에 배치된 프로펠러(3) 형태의 회전 디바이스를 갖는다. 밸브 디스크(4)는 그 밀봉면(5) 상에서 보강된다. 프로펠러(3)의 윙(6)은 프로펠러의 회전 형상으로 밀링된다. The gas exchange valve, in particular the outlet valve 1 for the internal combustion engine, has a rotating device in the form of a propeller 3 arranged on the valve shaft 2. The valve disc 4 is reinforced on its sealing surface 5. The wing 6 of the propeller 3 is milled into the rotational shape of the propeller.

또한, 밸브콘(1)의 다양한 온도 구역의 열, 피로 및 내식성에 대한 상이한 요건은, 밸브 디스크(4)가 높은 내열성 및 내연성 재료로 형성되고, 프로펠러(3)를 포함하는 밸브 샤프트(2)가 낮은 노치 감도와 높은 내피로성, 즉 이 영역에서 발생하는 굴곡 응력을 상쇄시키기에 충분한 인성을 갖는 물질로 이루어진다는 점을 고려하는 것으로 알려져 있다. 통상적인 밸브 강, 또는 NiCr2OTiAl과 같은 초합금으로 이루어진 물질은 밸브 디스크(4)를 위해 사용하는 것이 바람직하고, X45CrSi9 -3과 같은 통상적인 고온 성형 강으로 이루어진 물질은 프로펠러(3)를 포함하는 밸브 샤프트(2)를 위해 사용하는 것이 바람직하다. 밸브 디스크(4)는 마찰 용접부(7)에 의해 밸브 샤프트(2)에 연결된다.In addition, different requirements for the heat, fatigue and corrosion resistance of the various temperature zones of the valve cone 1 are such that the valve disc 4 is formed of a high heat resistant and flame resistant material and comprises a propeller 3. It is known to take into account that is made of a material having low notch sensitivity and high fatigue resistance, i.e., sufficient toughness to offset the bending stress occurring in this region. A material made of conventional valve steel, or a superalloy such as NiCr 2 OTiAl, is preferably used for the valve disc 4, while a material made of conventional hot forming steel, such as X 45 CrSi 9 -3 , is made of the propeller 3 It is preferable to use for the valve shaft (2) comprising a. The valve disc 4 is connected to the valve shaft 2 by friction welding 7.

본 도면에 도시한 예시적인 유출 밸브(1)에서, 밸브콘은 적어도 부분적인 영역에, 질소 또는 질소-탄소 분위기에서 질화물 형성제 합금을 플라즈마 질화 또는 플라즈마 질화 침탄에 의해 반응시킴으로써 생성되는 질화층(8) 형태의 내식층이 마련된다.In the exemplary outflow valve 1 shown in this figure, the valve cone is formed of a nitride layer formed by reacting a nitride former alloy with at least a partial region in a nitrogen or nitrogen-carbon atmosphere by plasma nitriding or plasma nitriding carburization ( 8) A corrosion resistant layer of type is provided.

바람직한 방식에 있어서, 본원의 2개 부품으로 이루어진 가스 교환 밸브의 실시예에서, 열간 가공 강재가 또한 구획되는 마찰 용접부(7)까지의 완전한 밸브 샤프트(2)에는 질화층(8)이 마련되고, 중공형 콘(11)의 영역에서는 생략된 상태로 유지된다. 물론, 일반적으로 1개의 부품으로 이루어진 가스 교환 밸브의 실시예와 또한 복수 부품으로 이루어진 가스 교환 밸브의 실시예 모두에서, 밸브 디스크(4) 및 밸브 샤프트(2) 상의 2개의 전면은 질화물 및/또는 탄소 질화물층(8)이 마련되지 않을 수도 있다.In a preferred manner, in the embodiment of the two-part gas exchange valve of the present application, the nitride layer 8 is provided on the complete valve shaft 2 up to the friction weld 7 in which the hot work steel is also partitioned, In the region of the hollow cone 11, it remains omitted. Of course, in general both in the embodiment of the gas exchange valve consisting of one part and also in the embodiment of the gas exchange valve consisting of a plurality of parts, the two front faces on the valve disc 4 and the valve shaft 2 are nitride and / or The carbon nitride layer 8 may not be provided.

그러나, 바람직하게는 단일 부품 실시예에서, 밸브 디스크(4)의 보강된 밸브 시트 영역(5)과 디스크 저부까지의 전체 밸브콘(1)과 밸브 샤프트의 전방측에도 질화물층(8)이 마련될 수 있다.However, preferably in a single part embodiment, the nitride layer 8 is also provided on the reinforced valve seat area 5 of the valve disc 4 and the entire valve cone 1 up to the bottom of the disc and on the front side of the valve shaft. Can be.

본 발명에 따른 가스 교환 밸브에서, 경질의, 내마모성 경계층을 형성하도록 표면이 개조된다. 이러한 목적을 위해, 밸브콘 블랭크(blank)는, 최종 표면 조도가 제공되고, 플라즈마 질화 및/또는 플라즈마 질화 침탄이 후속하여 실시되도록 모든 제조 단계에 걸쳐 밸브 샤프트 형태로 가공되거나, 전체가 밸브 샤프트(2)와 밸브 플레이트(4) 형태로 가공된다. 질산으로 처리된 가스 교환 밸브의 후처리가 가능하긴 하지만, 필수적인 것은 아니다(그러나, 후처리는 생성된 접합층을 제거하지 않도록 부식으로부터 보호되는 가스 교환 밸브의 영역에서는 실시되지 않음). 예컨대, 밸브콘(1)은 질화 이후에 그라인딩될 수 있다.In the gas exchange valve according to the invention, the surface is adapted to form a hard, wear resistant boundary layer. For this purpose, the valve cone blank is processed in the form of a valve shaft throughout all of the manufacturing steps so that the final surface roughness is provided and subsequent plasma nitriding and / or plasma nitriding carburization is carried out, or the whole valve shaft ( 2) and valve plate 4 are processed. Although post-treatment of nitric acid treated gas exchange valves is possible, it is not necessary (however, post-treatment is not done in the region of gas exchange valves protected from corrosion so as not to remove the resulting bonding layer). For example, the valve cone 1 may be ground after nitriding.

생성된 내식층에 대한 특성으로서, 질화층은 두께(8)(질화 경도 깊이)가 0.1 내지 0.3 mm인 확산층(9)과 이 확산층 상에 3 내지 5 ㎛로 형성된 접합층을 갖고, 750 HV(비커스)가 넘는 표면 경도를 제공하는 것을 특정할 수 있다. As a characteristic for the resulting corrosion resistant layer, the nitride layer has a diffusion layer 9 having a thickness 8 (nitriding hardness depth) of 0.1 to 0.3 mm and a bonding layer formed of 3 to 5 mu m on the diffusion layer, and 750 HV ( To provide a surface hardness of more than Vickers).

접합층을 위해 10 ㎛ 정도의 두께를 달성하고자 하는 경우, 탄소의 첨가와 함께 플라즈마 질화 침탄이 바람직하다.If it is desired to achieve a thickness of about 10 μm for the bonding layer, plasma nitriding carburization is preferred with addition of carbon.

현저히 증가된 내식성과 장기적으로 변하는 피로 강도의 증대는 플라즈마 질화 및/또는 플라즈마 질화 침탄에 의해 달성된다. 즉, 보다 긴 유지 관리 간격 및/또는 구성품의 작동 수명이 달성되고, 굴곡 변형으로 인한 크랙킹이 상쇄된다.Significantly increased corrosion resistance and long-term varying fatigue strength are achieved by plasma nitriding and / or plasma nitriding carburization. That is, longer maintenance intervals and / or operating life of the components are achieved, and cracking due to bending deformation is offset.

Claims (4)

내연 기관의 가스 교환 밸브로서, 중공형 콘(11)을 형성하면서, 밸브 디스크(4)로 이어지는 밸브 샤프트(2)로 실질적으로 이루어는 밸브콘(1)을 구비하고, 이 밸브콘(1) 또는 적어도 밸브 샤프트(2)는 중공형 콘(11)의 영역까지 질화물 형성제 합금으로 이루어진 통상적인 밸브 강으로 제조되는 것인 가스 교환 밸브에 있어서,A gas exchange valve of an internal combustion engine, comprising a valve cone (1) consisting essentially of a valve shaft (2) leading to a valve disc (4), forming a hollow cone (11), the valve cone (1) Or in a gas exchange valve wherein at least the valve shaft 2 is made of conventional valve steel made of a nitride former alloy up to the region of the hollow cone 11, 상기 밸브콘(1)은 적어도 부분적인 영역에 질화물 및/또는 탄소 질화물층 형태의 내식층(8)이 마련되고, 이 내식층(8)은 질소 분위기에서 플라즈마 질화(plasma nitration) 또는 플라즈마 질화 침탄(plasma nitro-carburization)에 의해 질화물 형성제 합금을 반응시킴으로써 생성되는 것을 특징으로 하는 가스 교환 밸브.The valve cone 1 is provided with a corrosion resistant layer 8 in the form of a nitride and / or carbon nitride layer in at least a partial region, the corrosion resistant layer 8 being plasma nitration or plasma nitridation carburizing in a nitrogen atmosphere. A gas exchange valve produced by reacting a nitride former alloy by plasma nitro-carburization. 제1항에 있어서, 1개의 부품으로 이루어진 형태에서, 밸브 디스크(4)의 보강 밸브 시트 영역은 물론 밸브 디스크의 저부 및 밸브 샤프트 전방측에 이르는 전체 밸브콘(1)에 질화층(8)이 마련되는 것을 특징으로 하는 가스 교환 밸브.The nitride layer (8) according to claim 1, wherein in the form of one component, the nitride layer (8) is formed in the entire valve cone (1) extending not only to the reinforcing valve seat region of the valve disc (4) but also to the bottom of the valve disc and the valve shaft front side. Gas exchange valve, characterized in that provided. 제1항에 있어서, 2개의 부품으로 이루어진 형태에서, 밸브 샤프트(2)에는 적어도 연소 가스와 접촉하게 되는 외면 상에, 열간 가공 강재가 구획되는 경계면(7)까지 질화층(8)이 전체적으로 마련되고, 밸브 플레이트(4)와 가능하다면 중공형 콘(11)의 영역은 질화층(8)을 생략한 상태로 유지되는 것을 특징으로 하는 가스 교환 밸브.2. The nitride layer 8 as set forth in claim 1, wherein the valve shaft 2 is provided on the valve shaft 2 at least on the outer surface which comes into contact with the combustion gas, up to the boundary surface 7 where the hot-worked steel is partitioned. And the region of the valve plate (4) and possibly the hollow cone (11) is kept with the nitride layer (8) omitted. 제1항 내지 제3항 중 어느 한 항에 있어서, 상기 질화층(8)은 두께(질화 경도 깊이)가 0.1 내지 0.3 mm인 확산층(9)과, 이 질화층 상에 3 내지 5 ㎛로 형성된 접합층(10)을 구비하며, 표면 경도가 750 HV(비커스)보다 큰 것을 특징으로 하는 가스 교환 밸브.4. The nitride layer (8) according to any one of claims 1 to 3, wherein the nitride layer (8) is formed with a diffusion layer (9) having a thickness (nitriding hardness depth) of 0.1 to 0.3 mm and 3 to 5 mu m on the nitride layer. And a bonding layer (10), the surface hardness being greater than 750 HV (Vickers).
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