EP0721997A1 - Verfahren zur Oberflächenbehandlung eines Ventils aus Titanium oder Titaniumlegierung - Google Patents
Verfahren zur Oberflächenbehandlung eines Ventils aus Titanium oder Titaniumlegierung Download PDFInfo
- Publication number
- EP0721997A1 EP0721997A1 EP95300133A EP95300133A EP0721997A1 EP 0721997 A1 EP0721997 A1 EP 0721997A1 EP 95300133 A EP95300133 A EP 95300133A EP 95300133 A EP95300133 A EP 95300133A EP 0721997 A1 EP0721997 A1 EP 0721997A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve element
- valve
- covering layer
- layer
- nitriding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
-
- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
-
- 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
- C23C4/18—After-treatment
-
- 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
- C23C8/02—Pretreatment of the material to be coated
Definitions
- the present invention relates to a method of treating the surface of a valve element in an engine valve moulded from Ti or Ti alloy, and especially a method of treating the outer circumferential surface of a stem of the valve element to improve wear resistance thereof.
- the largest obstacle is increase in inertia mass owing to weight of a valve operating mechanism.
- the valve element is moulded from Ti or Ti alloy having low specific gravity and high heat resistance, thereby lightening the valve element.
- Ti or Ti alloy has Rockwell hardness (HRC) of about 30 to 40, thereby decreasing wear resistance of a stem which is always guided to a valve guide and slidably reciprocates at high speed, so that it is liable to cause baking or galling.
- HRC Rockwell hardness
- Japanese Utility Model Laid-Open Pub. No.4-103211 describes an engine valve in which salt bath soft nitriding is applied to the outer circumferential surface of a stem to increase wear resistance thereof.
- a nitrided layer hardened layer
- a method of treating the surface of Ti or Ti alloy valve element in an engine valve comprising a head and a stem, the method comprising the steps of forming an Fe covering layer on the outer circumferential surface of the stem which slidably contacts a valve guide; and applying nitriding to said covering layer to form a nitrided layer.
- nitriding is applied to the covering layer, so that nitrogen deeply diffuses compared with a conventional engine valve in which nitriding is applied directly onto Ti.
- relatively thick nitrided layer is formed. Accordingly, wear resistance is remarkably increased at the valve stem which slidably contacts a valve guide, thereby providing a durable engine valve.
- Fig. 1 illustrates an engine valve according to the present invention, in which a valve element 3 which comprises a head 1 and a stem 2 is integrally moulded from Ti or Ti alloy (Ti-Al-V). On the whole surface of the valve element 3 except the head, there is formed a covering layer 4 from thermal spraying material of a heat-resisting steel or alloy steel such as Fe, Ni or Co as base.
- the covering layer 4 may be made of the thermal spraying material like powder, rod or wire with thermal spraying means such as plasma and gas flame to provide thickness of 50 to 200 ⁇ m.
- the outer circumferential surface of the valve element 3 Prior to formation of the covering layer 4, the outer circumferential surface of the valve element 3 may be a rough surface 5 by blasting treatment as shown in Fig. 2, thereby increasing bond strength of the spraying material to the surface of the element to increase peel resistance of the covering layer 4.
- a nitrided layer 6 On the surface of the covering layer 4, there is formed a nitrided layer 6 with thickness of 10 to 30 ⁇ m.
- the nitrided layer 6 is easily formed by general salt bath soft nitriding (Tufftriding).
- a treating bath which contains KCN, KOCN and Na 4 [Fe(CN) 6 ] as main ingredient is heated to about 600°C, and the valve element 3 is immersed in the bath for 1 to 2 hours.
- a compound (nitrided) layer which contains very hard carbide and nitride.
- the compound layer provides excellent wear-, galling- and baking-resistance, thereby increasing wear resistance not only of a portion of the stem which slidably contacts a valve guide 7, but also of a stem face 8 which contacts a locker arm and a tappet (not shown), a valve face 9 which contacts a valve seat (not shown) and a cotter groove 10.
- the covering layer 4 made of steel is formed on the surface of the Ti valve element, soft nitriding is applied on the surface of the covering layer 4 to form the nitrided layer 6, so that diffusion of nitrogen becomes deeper than a conventional direct nitriding on the surface of Ti valve element, thereby forming a thick nitrided layer 6 for usual treating time.
- padding may be applied instead of thermal spraying, and material for thermal spraying may comprise cheaper carbon- or stainless-steel instead of the foregoing heat-resisting steel.
- Nitriding may be gas-, liquid-, ion- or gas-carburizing nitriding instead of the salt bath soft nitriding.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5268633A JPH07119420A (ja) | 1993-10-27 | 1993-10-27 | チタン又はチタン合金製エンジンバルブの表面処理方法 |
EP95300133A EP0721997A1 (de) | 1993-10-27 | 1995-01-11 | Verfahren zur Oberflächenbehandlung eines Ventils aus Titanium oder Titaniumlegierung |
CN95100732.7A CN1127801A (zh) | 1993-10-27 | 1995-01-24 | Ti或Ti合金气门元件的表面的处理方法 |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5268633A JPH07119420A (ja) | 1993-10-27 | 1993-10-27 | チタン又はチタン合金製エンジンバルブの表面処理方法 |
EP95300133A EP0721997A1 (de) | 1993-10-27 | 1995-01-11 | Verfahren zur Oberflächenbehandlung eines Ventils aus Titanium oder Titaniumlegierung |
CN95100732.7A CN1127801A (zh) | 1993-10-27 | 1995-01-24 | Ti或Ti合金气门元件的表面的处理方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0721997A1 true EP0721997A1 (de) | 1996-07-17 |
Family
ID=37102017
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95300133A Withdrawn EP0721997A1 (de) | 1993-10-27 | 1995-01-11 | Verfahren zur Oberflächenbehandlung eines Ventils aus Titanium oder Titaniumlegierung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0721997A1 (de) |
JP (1) | JPH07119420A (de) |
CN (1) | CN1127801A (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1097778A2 (de) * | 1999-10-20 | 2001-05-09 | Duroc Ab | Verfahren zur Herstellung von Werkstücken aus metallischen Materialen und mittels eines solchen Verfahren hergestellte Werkstücke |
WO2003074752A1 (en) * | 2002-02-28 | 2003-09-12 | Swagelok Company | Case hardening of titanium |
WO2016057481A1 (en) * | 2014-10-06 | 2016-04-14 | Caterpillar Inc. | Nitrided engine valve with hvof coating |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101176905B (zh) * | 2003-12-22 | 2011-11-09 | 本田技研工业株式会社 | 构件的成形方法、气门导管及其成形方法、筒状构件的成形方法 |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3111434A (en) * | 1960-08-01 | 1963-11-19 | Kobe Steel Ltd | Surface hardening of metal body consisting of or containing titanium or zirconium |
FR1453876A (fr) * | 1965-05-13 | 1966-07-22 | Ct Tech De L Ind Horlogere | Procédé de traitement de pièces à revêtements métalliques de grande dureté età forte protection contre la corrosion et pièces à revêtements métalliques obtenues selon ce procédé |
FR2148543A1 (de) * | 1971-08-09 | 1973-03-23 | Nissan Motor | |
JPS6082654A (ja) * | 1983-10-12 | 1985-05-10 | Toyota Motor Corp | 摺動部材 |
EP0248431A2 (de) * | 1986-06-04 | 1987-12-09 | Politechnika Krakowska im. Tadeusza Kosciuszki | Verfahren zur Herstellung von äusseren Decksschichten an den hitzebeständigen sowie korrosionsfesten insbesondere austenitischen Stählen |
EP0266149A2 (de) * | 1986-10-27 | 1988-05-04 | Hitachi, Ltd. | Hochverschleissbeständiges Bauteil, Verfahren zu seiner Herstellung und Ventilgetriebe zur Verwendung innerhalb einer Verbrennungsmaschine |
JPH02129467A (ja) * | 1988-11-08 | 1990-05-17 | Toyota Motor Corp | ピストンリング及びその製造方法 |
EP0456847A1 (de) * | 1987-06-26 | 1991-11-21 | Bernex Gmbh | Verfahren zur Herstellung einer Schutzschicht mit hohem Verschleiss- und Korrosionswiderstand aus einer austenitischen Eisenbasislegierung und nach dem Verfahren hergestellte Schutzschicht |
JPH0560241A (ja) * | 1991-09-02 | 1993-03-09 | Teikoku Piston Ring Co Ltd | ピストンリングおよびその製造方法 |
JPH06173079A (ja) * | 1992-12-08 | 1994-06-21 | Kobe Steel Ltd | 耐摩耗性に優れたTiまたはTi合金材およびその製法 |
-
1993
- 1993-10-27 JP JP5268633A patent/JPH07119420A/ja active Pending
-
1995
- 1995-01-11 EP EP95300133A patent/EP0721997A1/de not_active Withdrawn
- 1995-01-24 CN CN95100732.7A patent/CN1127801A/zh active Pending
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3111434A (en) * | 1960-08-01 | 1963-11-19 | Kobe Steel Ltd | Surface hardening of metal body consisting of or containing titanium or zirconium |
FR1453876A (fr) * | 1965-05-13 | 1966-07-22 | Ct Tech De L Ind Horlogere | Procédé de traitement de pièces à revêtements métalliques de grande dureté età forte protection contre la corrosion et pièces à revêtements métalliques obtenues selon ce procédé |
FR2148543A1 (de) * | 1971-08-09 | 1973-03-23 | Nissan Motor | |
JPS6082654A (ja) * | 1983-10-12 | 1985-05-10 | Toyota Motor Corp | 摺動部材 |
EP0248431A2 (de) * | 1986-06-04 | 1987-12-09 | Politechnika Krakowska im. Tadeusza Kosciuszki | Verfahren zur Herstellung von äusseren Decksschichten an den hitzebeständigen sowie korrosionsfesten insbesondere austenitischen Stählen |
EP0266149A2 (de) * | 1986-10-27 | 1988-05-04 | Hitachi, Ltd. | Hochverschleissbeständiges Bauteil, Verfahren zu seiner Herstellung und Ventilgetriebe zur Verwendung innerhalb einer Verbrennungsmaschine |
EP0456847A1 (de) * | 1987-06-26 | 1991-11-21 | Bernex Gmbh | Verfahren zur Herstellung einer Schutzschicht mit hohem Verschleiss- und Korrosionswiderstand aus einer austenitischen Eisenbasislegierung und nach dem Verfahren hergestellte Schutzschicht |
JPH02129467A (ja) * | 1988-11-08 | 1990-05-17 | Toyota Motor Corp | ピストンリング及びその製造方法 |
JPH0560241A (ja) * | 1991-09-02 | 1993-03-09 | Teikoku Piston Ring Co Ltd | ピストンリングおよびその製造方法 |
JPH06173079A (ja) * | 1992-12-08 | 1994-06-21 | Kobe Steel Ltd | 耐摩耗性に優れたTiまたはTi合金材およびその製法 |
Non-Patent Citations (4)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 14, no. 364 (M - 1007) 7 August 1990 (1990-08-07) * |
PATENT ABSTRACTS OF JAPAN vol. 17, no. 374 (M - 1445) 14 July 1993 (1993-07-14) * |
PATENT ABSTRACTS OF JAPAN vol. 18, no. 517 (C - 1254) 29 September 1994 (1994-09-29) * |
PATENT ABSTRACTS OF JAPAN vol. 9, no. 222 (C - 302) 9 September 1985 (1985-09-09) * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1097778A2 (de) * | 1999-10-20 | 2001-05-09 | Duroc Ab | Verfahren zur Herstellung von Werkstücken aus metallischen Materialen und mittels eines solchen Verfahren hergestellte Werkstücke |
EP1097778A3 (de) * | 1999-10-20 | 2002-08-21 | Duroc Ab | Verfahren zur Herstellung von Werkstücken aus metallischen Materialen und mittels eines solchen Verfahren hergestellte Werkstücke |
WO2003074752A1 (en) * | 2002-02-28 | 2003-09-12 | Swagelok Company | Case hardening of titanium |
WO2016057481A1 (en) * | 2014-10-06 | 2016-04-14 | Caterpillar Inc. | Nitrided engine valve with hvof coating |
Also Published As
Publication number | Publication date |
---|---|
JPH07119420A (ja) | 1995-05-09 |
CN1127801A (zh) | 1996-07-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE ES FR GB IT |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19951222 |