WO2004107517A1 - スパークプラグ - Google Patents
スパークプラグ Download PDFInfo
- Publication number
- WO2004107517A1 WO2004107517A1 PCT/JP2004/003821 JP2004003821W WO2004107517A1 WO 2004107517 A1 WO2004107517 A1 WO 2004107517A1 JP 2004003821 W JP2004003821 W JP 2004003821W WO 2004107517 A1 WO2004107517 A1 WO 2004107517A1
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- WO
- WIPO (PCT)
- Prior art keywords
- noble metal
- mass
- spark plug
- metal member
- consumption
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/39—Selection of materials for electrodes
-
- 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
- C22C1/0466—Alloys based on noble metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Definitions
- the present invention relates to a spark plug used for an internal combustion engine. Background technology>
- spark plugs in which the discharge part that forms the spark discharge gap protrudes into the combustion chamber in order to improve the ignitability, are often used. Is being used. In such a situation, the discharge portion of the spark plug is exposed to a high temperature, so that the side electrodes and the center electrode constituting the discharge portion are more likely to be consumed by sparks. Therefore, in order to improve the spark erosion resistance of the discharge part constituting the spark discharge gap, a spark plug of a type in which a noble metal chip mainly composed of Pt, Ir, etc. is welded to the tip of the side electrode or the center electrode is used. Many have been proposed.
- Patent Document 1 discloses a spark plug having a noble metal tip mainly composed of Ir and Rh.
- the noble metal tip in this plug suppresses spark consumption by taking advantage of the high melting point of Ir, and by adding Rh, the Ir can be oxidized and volatilized at high temperatures (about 900 ° C or higher). It can prevent the noble metal chips from being oxidized and consumed, and can improve wear resistance at higher temperatures.
- Patent Document 2 discloses a plug having a predetermined noble metal tip having a predetermined tip diameter D and a discharge portion thickness H, having Ir as a main component, and adding Rh and Ni.
- the oxidation and volatilization of Ir is prevented by adding Rh while taking advantage of the high melting point of Ir. Furthermore, depending on the operating conditions, abnormal wear that may occur on the noble metal tip with Rh added to Ir, specifically, the side of the noble metal tip is selected from one direction A plug using a noble metal tip to which Ni is further added in order to suppress an abnormal wear phenomenon that is consumed so as to be cut off is disclosed.
- the details of the mechanism of the occurrence of such a sweating phenomenon in the noble metal tip are unknown, it is considered that the Ir contained in the consumable part volatilized, then solidified, adhered, grew and became granular.
- the noble metal tip is consumed preferentially from the grain boundary part (especially, EA at the center left).
- the particulate matter 201 grows together with one another and hangs down like a mushroom mushroom portion. It has a shape as if a part of 200 is coming off. With such a configuration, the heat dissipation of the noble metal chip 200 is reduced, and the durability is further reduced.
- the present invention relates to a spark plug including a noble metal member facing at least one of a center electrode and a side electrode forming a spark discharge gap between the center electrode and the center electrode. It is an object of the present invention to provide a spark plug with high durability, which suppresses spark consumption, oxidation consumption, and abnormal consumption, and also suppresses sweating of precious metal members.
- the solution is a spark plug comprising: a center electrode; and a side electrode located at least on a side of the center electrode and forming a spark discharge gap with the center electrode. At least one of the electrode and the side electrode includes a noble metal member facing the spark discharge gap.
- the noble metal member has Ir as a main component, and 111 has a concentration of 0.3% by mass or more and 43% by mass or less.
- Ru is not less than 5.2% by mass and not more than 41% by mass
- Ni is not less than 0.4% by mass and not more than 19% by mass. This is a spark plug that contains / 0 or less and.
- the noble metal member included in at least one of the center electrode and the side electrode has good heat resistance because it has high melting point Ir as a main component. Further, since a predetermined amount of Rh is added to the noble metal member, the volatile consumption of Ir can be suppressed even at a high temperature. In addition, since a predetermined amount of Ni is also added to the noble metal member, the conventional spark plug is suppressed from generating abnormal wear even under use conditions in which the noble metal member has a scoop-like abnormal wear. .
- the noble metal member has Ir as a main component means that the content of Ir in the noble metal member is 5 °% by mass or more.
- the noble metal member may contain substances other than Ir, Rh, Ru, and Ni.
- noble metal members may contain a small amount of unavoidable impurities (eg, Si, W, etc.) which are unavoidably included when using Ir, Rh, Ru, Ni as raw materials.
- unavoidable impurities eg, Si, W, etc.
- precious metal components such as Pt, Pd, Re, O s can be included.
- the plug precious metal component
- a relatively low temperature about 600 ° C
- An oxide (including a composite oxide) of an element selected from r and H f can be included.
- the composition of the noble metal member in the spark plug within the above range, it is possible to suppress oxidative consumption and abnormal consumption while maintaining high heat resistance, and further suppress sweating phenomenon. In the durability test, the durability can be improved as the consumption amount becomes 0.15 mm or less.
- the noble metal member contains Ir as a main component, and contains 1.0 mass% or more and 31 mass% or less of Rh and 5.2 mass% / 0 of Ru. It is preferable to use a spark plug that contains not less than 31% by mass and not more than 0.4% by mass and not more than 7% by mass of ⁇ 1.
- the composition of the noble metal member in the spark plug within the above range, it is possible to suppress oxidative consumption and abnormal consumption while maintaining high heat resistance, and further suppress sweating phenomenon. In the durability test, the durability can be improved as the consumption amount becomes 0.1 Omm or less.
- the noble metal member contains Ir as a main component, and contains 6.5 to 22 mass% of Rh, and 5.2 to 24 mass% of Ru. % Or less, and 1 ⁇ 1 is 0.4% by mass or more and 3.5% by mass or less.
- the spark plug by maintaining the composition of the noble metal member in the spark plug within the above range, it is possible to suppress oxidative consumption and abnormal consumption while maintaining high heat resistance, and further suppress sweating phenomenon. In the durability test, the durability can be improved as the consumption amount becomes 0.05 mm or less. Furthermore, the spark plug according to any one of claims 1 to 4, wherein the noble metal member has a Ru of 8% by mass or more and 20% by mass. It is good to use spark plugs that include / 0 or less.
- the present invention high heat resistance is maintained, oxidation wear and abnormal wear are suppressed, and in a durability test described later, the durability becomes better as the wear amount becomes 0.3 mm or less.
- the Ru composition of the noble metal member in the spark plug within the above range, it is possible to reduce the occurrence of a sweating phenomenon that causes consumption of the noble metal member and adhesion of particulate matter, and furthermore, an occurrence of a peeling phenomenon that progresses. In this way, wear and deformation of the noble metal member due to this are effectively suppressed.
- the oxidative consumption of the noble metal member at a high temperature can be further suppressed.
- the noble metal member of the spark plug is further provided with Sr, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm. , Yb, Lu, Ti, Zr, and Hf (including complex oxides), and further, when the temperature of the noble metal member is relatively low (for example, 60 (About 0 ° C), it is possible to effectively suppress oxidation consumption and spark consumption of the precious metal member.
- the content of the oxides of the above-mentioned elements is in the range of 0.5 to 3% by mass. If it is less than 0.5% by mass, the effect of preventing the oxidation and volatilization by the addition of the oxide cannot be sufficiently obtained. On the other hand, if the oxide content exceeds 3% by mass, the heat resistance of the noble metal chip may be impaired.
- the noble metal member is a spark plug including at least one of Y2 03, La 2 O 3, Th, 2, and ⁇ r ⁇ 2.
- the noble metal member in the spark plug further, Y 2 ⁇ 3, L a 2 0 a, to include at least one of T h O2, Z r ⁇ 2.
- a center electrode, a side electrode located at least on a side of the center electrode and forming a spark discharge gap with the center electrode A spark plug comprising: a noble metal member facing the spark discharge gap, wherein at least one of the center electrode and the side electrode includes:
- the noble metal member fixed to at least one of the center electrode and the side electrode has good heat resistance because it has high melting point Ir as a main component.
- Ir melting point
- the noble metal member since Rh is added to the noble metal member, the volatile consumption of Ir can be suppressed even at a high temperature.
- Ni is added to this noble metal member, the occurrence of abnormal wear in conventional spark plugs is suppressed even under the usage conditions in which the noble metal member has scooped abnormal wear. .
- the noble metal member contains Ir as a main component means that the content of Ir in the noble metal member is 50% by mass or more.
- the noble metal member is a spark plug containing Ni in an amount of 0.4 mass% or more and less than Ru.
- abnormal consumption can be sufficiently suppressed by adding Ni to the noble metal member in an amount of 0.4 mass ° / 0 or more.
- the content of Ni is less than the content of Ru, the amount of consumption can be sufficiently suppressed.
- the spark plug according to claim 9 or 10 wherein the noble metal member is a spark plug that includes Rh in a range of 0.3% by mass or more and a content of Ru or less. Good to be.
- oxidation consumption can be sufficiently suppressed by adding 111% by mass or more to the noble metal member.
- the content of Rh is equal to or less than the content of Ru, the amount of consumption can be sufficiently suppressed.
- FIG. 1 is a sectional view of a spark plug according to the embodiment.
- FIG. 2 (a) is a partially enlarged half sectional view of the spark plug shown in FIG. 1, and FIG. 2 (b) is an enlarged sectional view of a main part thereof.
- FIG. 3 is a table showing the compositions and test results of the spark plugs according to the examples and the comparative examples.
- FIG. 4 shows the relationship between the Rh content ⁇ and the consumption amount of the plug having a composition represented by Ir-Rh-6R-1Ni among the examples and comparative examples shown in the table of FIG. Graph 1 showing the relationship.
- FIG. 5 shows the Ru content
- Graph 2 showing the relationship with
- FIG. 6 shows the relationship between the Ni content ⁇ and the amount of consumption for the plugs having the composition represented by Ir_8Rh-llRu-yN i among the examples and comparative examples shown in the table of FIG. Graph 3 showing the relationship.
- FIG. 7 is a photograph showing an example of a noble metal tip after a durability test has been performed on the spark plug according to the embodiment.
- FIG. 8 is an explanatory diagram of the noble metal tip shown in FIG.
- FIG. 9 is a photograph showing a noble metal chip after a durability test was performed on a conventional spark plug.
- FIG. 10 is an explanatory diagram of the noble metal tip shown in FIG.
- 100 is the spark plug, 100 mm is the central axis (of the spark plug), 1 is the metal shell, 1 T is the tip face, 1 1 is the male thread, 2 is the insulator, 21 is the tip End, 2 H is through hole, 3 is center electrode, 3 1 is 1st discharge part, 3 1 is 1st discharge surface,
- 3 2 is the center electrode body
- 3 2 T is the body tip surface
- 3 3 is the first noble metal tip
- 3 3 T is the first chip tip surface
- 3 3 S is the first chip side surface
- 3 4 is the first welded portion
- 3 5 is the core
- 4 is the side electrode
- 4 1 is the second discharge part
- 4 1 T is the second discharge surface
- 42 is the side electrode body
- 4 2 R is the connection
- 42 S is the inner surface
- 43 is the second noble metal tip
- 43 T is the tip of the second chip
- 43 S is the side of the second chip
- 44 is the second weld
- G is a spark discharge gap
- 5 is a terminal fitting
- 6 is a resistor
- 7 and 8 are conductive glass seal layers.
- FIG. 1 is a longitudinal sectional view of a spark plug 100 according to the present embodiment
- FIG. 2 (a) is an enlarged half sectional view of a portion near a spark discharge gap G in the spark plug 100. It is an expanded sectional view of the important section further.
- the spark plug 100 of the present embodiment is a so-called spark plug containing a resistor.
- the spark plug 100 has a cylindrical metal shell 1 and an insulator 2 fitted inside the metal shell 1 such that a tip 21 protrudes from the metal shell 1.
- the plug 100 is inserted into the insulator 2, and the first discharge portion 31 at the tip (lower side in the figure) is protruded from the tip 21 of the insulator 2. It has a center electrode 3 provided at the center.
- the center electrode 3 extends along the center axis 100 X of the spark plug 100, and surrounds a core body 35 made of a metal having good thermal conductivity such as Cu or a Cu alloy.
- a center electrode main body 32, and a main body front end surface (lower end surface in the figure) 32T of the center electrode main body 32 have a first noble metal tip 33 welded by a first welding portion 34. I have.
- the first noble metal tip 33 has a cylindrical shape of 0.6 ⁇ ⁇ . 0.8 mmt, and forms a first discharge portion 31 in which spark discharge mainly occurs in the center electrode 3.
- the first tip end face (lower end face in the figure) 3 3 T of the first noble metal tip 33 faces the side electrode 4 described below, and the first discharge face 3 1 of the first discharge portion 3 1 Make 1 T.
- the plug 100 is connected to the tip surface (lower surface in the figure) 1 T of the metal shell 1, It has a side electrode (ground electrode) 4 located on the side (left side in the figure) of the center electrode 3.
- the lateral electrode 4 is welded to the distal end face 1T of the metal shell 1 at the base end side connection portion 42R, and the distal end side becomes substantially L-shaped toward the central axis 100X (the central electrode 3).
- Side electrode body 42 bent in such a manner.
- the inner surface 42 on the side of the center electrode 3 is provided with a second noble metal tip 4 3 welded to the side electrode body 42 via the second welding portion 44.
- the second noble metal tip 43 has a disk shape of 0.7 ⁇ ⁇ X 0.3 mmt, and is arranged on the center axis 10 OX of the plug 100 as shown in FIG. 2 (b).
- the side electrode 4 forms a second discharge portion 41 in which spark discharge mainly occurs.
- the second chip tip surface 43 T (upper surface in the figure) faces the first discharge surface 31 T of the center electrode 3 (the first chip tip surface 33 T of the first noble metal tip 33 3). And forms a second discharge surface 41 T of the second discharge part 41.
- the spark discharge gap between the first discharge portion 31 of the center electrode 3 and the second discharge portion 41 of the side electrode 4 (the first discharge surface 31T and the second discharge surface 41T) is formed.
- G is formed. Therefore, the first discharge portion 3 1 (first noble metal tip 3 3) of the center electrode 3 and the second discharge portion 4 1 (second noble metal tip 4 3) of the side electrode 4 both have a spark discharge gap G. And constitutes this gap G.
- the side electrode 4 is electrically connected to an engine block (not shown) through the metal shell 1, so that the side electrode 4 is set to the ground potential.
- the metal shell 1 is made of a metal such as low-carbon steel and is formed in a cylindrical shape to constitute a housing of the spark plug 100. On the outer peripheral surface of the metal shell 1, a male screw portion 11 for attaching the spark plug 100 to an engine block (not shown) is formed.
- the insulator 2 is a cylindrical body made of, for example, a ceramic sintered body such as alumina or aluminum nitride and having a through hole 2H penetrating therein along its own axial direction (vertical direction in the figure).
- a substantially rod-shaped terminal fitting 5 is inserted into and fixed to one end (upper side in the figure) of the through hole 2H.
- the center electrode 3 is inserted and fixed to the other end side (the lower side in the figure) as described above.
- a resistor 6 is arranged between the terminal fitting 5 and the center electrode 3. Both ends of the resistor 6 are electrically connected to the center electrode 3 and the terminal fitting 5 via conductive glass seal layers 7 and 8, respectively.
- the terminal metal 5 and the center electrode 3 are electrically connected via the resistor 6.
- the center electrode body 32 of the center electrode 3 is made of a Ni-based heat-resistant alloy such as INC0NEL600 (trademark of INCO UK) or a Fe-based heat-resistant alloy. Further, of the side electrodes 4, the side electrode body 42 is made of, for example, a Ni-based heat-resistant alloy such as INCONEL600 or INCONEL601.
- a part of the center electrode main body 32 protrudes from the distal end portion 21 of the insulator, and the first noble metal tip 33 is further provided at the distal end thereof.
- the structure is welded. Therefore, the distance from the first noble metal tip 33 to the core 35 for heat drawing tends to be large. Therefore, when the plug 100 is used, the heat flowing into the first noble metal tip 33 (the first discharge portion 31) is not easily radiated, and the temperature of the first noble metal tip 33 tends to increase.
- the second noble metal tip 4 3 (second heat radiating section 41) is fixed to the side electrode body 42 made of a Ni alloy heat-resistant alloy having a lower thermal conductivity than Cu or the like.
- the second noble metal tip 43 is also hard to dissipate heat and tends to increase in temperature during use.
- a side electrode body 42 having a core body made of Cu or a Cu alloy may be used.
- the plug 100 is consumed not only by spark discharge but also by oxidative consumption due to oxidation and volatilization of Ir at high temperatures. It is required to use a noble metal tip with a composition that takes into account abnormal wear.
- the first and second noble metal chips 33 and 43 forming the first and second discharge units 31 and 41 have Ir as a main component.
- a total of 25 Ir-based alloys containing various amounts of power ⁇ Rh, Ru, and Ni were manufactured, and the same number of test plugs 100 were manufactured.
- the first noble metal tip 33 and the second noble metal tip 43 are made of the same noble metal.
- the first and second noble metal tips 33, 43 are melted or sintered depending on their composition. Formed by knotting.
- the melting method noble metal powder as a raw material is blended at a desired ratio, and once melted, cooled to form an alloy ingot.
- arc melting was used.
- melts for example, plasma beam melting, high frequency induction melting and the like can be mentioned.
- a liquid (hot water) of a noble metal alloy is prepared using a water-cooled mold or the like and is made into a quenched ingot, segregation of the alloy can be reduced, so that this method can also be employed.
- the obtained nod metal alloy INGOD is formed into a rod by hot forging, and then hot-rolled by a grooved roll, and further reduced in diameter by hot swaging, and finally hot drawn.
- a noble metal wire having a desired wire diameter Thereafter, this noble metal wire was cut to have a desired thickness to obtain first and second noble metal tips 33, 43.
- first and second noble metal chips 33, 43 from the ingot of the noble metal alloy, one or more of hot forging, hot rolling and hot wire drawing are required in addition to the above.
- the ingot of the noble metal alloy may be formed into a plate shape by hot rolling, and the plate material may be punched into a predetermined chip shape by hot punching.
- a spherical noble metal alloy is produced by a well-known atomizing method, and this is compressed by a press or a flat die into flat or cylindrical first and second noble metal chips 33, 43. it can.
- noble metal powder mixed with a desired composition and added with PVA is compression-molded by die press molding, and then calcined in a hydrogen atmosphere at about 1000 ° C. Remove the binder. After that, firing is performed at about 2100 ° C in the same hydrogen atmosphere to produce an alloy ingot.
- both calcination and main calcination were performed in a hydrogen atmosphere, they can be performed in an argon atmosphere or vacuum.
- precious metal powder can be compression molded by CIP molding.
- sintering can be performed while applying pressure by HIP molding.
- the table shown in FIG. 3 describes whether the noble metal alloy was obtained by the melting method or the sintering method. Specifically, the bras of numbers 1-22 The noble metal tip used for the plug was manufactured by the melting method, and the noble metal tip used for the plugs of Nos. 23 to 25 was manufactured by the sintering method.
- the test plug 100 was manufactured by a known method. Specifically, first, the first noble metal tip 33 is welded to the center electrode body 32. More specifically, a disc-shaped first noble metal tip 33 is superimposed on the tip end surface 32 T of the center electrode main body 32. Next, a portion of the first chip side surface 33S near the contact portion with the center electrode main body 32 is irradiated with a laser beam over one round and welded to form a first welded portion 34 in a ring shape. Thus, the first noble metal tip 33 is welded to the tip surface 32T of the center electrode body 32 (see FIG. 2 (b)).
- energy beam welding other than laser welding, for example, electron beam welding, may be used in consideration of the material, dimensions, and the like of the center electrode body 32 and the first noble metal tip 33. Further, the entire end face of the first noble metal tip 33 can be melted by electric resistance welding and welded to the center electrode main body 32.
- the center electrode 3 is inserted into the through hole 2H of the insulator 2 so that the first noble metal tip 33 and a part of the center electrode body 32 project from the tip 21 of the insulator 2. .
- the glass for sealing, the resistor 6, the glass for sealing, and the terminal fitting 5 are inserted into the rear end side of the center electrode 3 in this order and then heated. As a result, the sealing glass is melted to form conductive glass seal layers 7 and 8, and the center electrode 3, the resistor 6, and the terminal fitting 5 are fixed in the through hole 2H.
- the metal shell 1 to which the unbent side electrode 4 is welded is attached to the insulator 2, and the second noble metal tip 43 is welded to the side electrode 4.
- a second welded portion 44 is formed at a predetermined position on the inner side surface 42S of the side electrode body 42 extending straight by resistance welding.
- the side electrode 4 is bent.
- the bending state of the side electrode body 42 is adjusted so that the second tip end surface 43T faces the first tip end surface 33T and a spark discharge gap G of a predetermined size is formed.
- the plug 100 was completed.
- the second noble metal tip 43 is connected to the side electrode body 42 by resistance welding as described above, is welded by laser welding, or is further laser-welded after resistance welding. It can be connected to the side electrode body 42 by welding. Examples>
- the test plug 100 described above was subjected to the following experiment.
- the specific contents of the experiment are as follows: Spark plugs 100 were attached to a 200 cc gasoline engine (six cylinders), respectively, with the throttle fully open and the engine speed 500 000 The operation was performed for a total of 300 hours while maintaining the rpm state.
- the fuel used was lead-free gasoline, and the temperature at the tip of the center electrode was 900 ° C.
- the spark discharge gap G of each spark plug was set to 1.1 mm at the beginning of the test. After the test, the spark discharge gap G is measured, and the consumption of the first and second noble metal chips 33, 43 (hereinafter, also simply referred to as the noble metal chip 33, etc.) is calculated, and the noble metal chip 33, etc.
- the presence or absence of abnormal wear (egret) and sweating were visually inspected using an optical microscope, and the results shown in the table in Fig. 3 were obtained (see Fig. 4).
- a noble metal sample having the same composition as the above noble metal tip 33 the presence or absence of oxidative consumption was examined by the following test. That is, a noble metal sample having the same composition as the first and second noble metal tips 33 and 43 is heated to 110 ° C. in the air and left for 20 hours. Then, the weight of the precious metal sample before and after this test was measured, and the weight residual ratio was measured.
- the “Composition” column shows the composition of the first and second noble metal chips used for the test plug 100.
- the number attached to each element and oxide indicates the composition ratio (% by mass) of the element (or oxide).
- the composition of the noble metal tip number 1.. (I r -. 0 2 R h- 6 R u _ l N i) is a R h ⁇ 2 wt%, the R u 6 0 mass 0/0, N This indicates that i was contained at 1.0% by mass, and the balance was Ir.
- the “consumed amount” column indicates the amount of increase in spark discharge gap G from the beginning of the test for the spark plug.
- the spark discharge gap G is the minimum distance between the first discharge surface 31 T and the second discharge surface 41 T.
- the amount of consumption is divided into five categories, ⁇ , ⁇ , ⁇ , ⁇ , and X, as follows.
- “ ⁇ ” indicates a case where the consumption amount is 0.05 mm or less
- “ ⁇ ” indicates a case where the consumption amount exceeds 0.05 mm and 0.1 mm.
- Mouth indicates that the consumption is more than 0.1 Omm and less than 0.15 mm
- ⁇ indicates that the consumption is more than 0.15 mm and less than 0.3 Omm
- X indicates that the consumption exceeded 0.3 Omm.
- the ⁇ Oxidation '' column in the table indicates the evaluation of oxidative depletion.When the above-mentioned residual weight ratio is 90% or more, it is indicated by ⁇ , and when the residual weight ratio is less than 90%, it is indicated by ⁇ X '' .
- the “Egret” column shows the evaluation of abnormal wear in which a part of the noble metal chip side surface 33 S, 43 S is selectively worn out and becomes scooped. "X" when abnormal wear occurs.
- the column of “Sweating” indicates whether or not there is a perspiration phenomenon in which a part of the noble metal tip is generated while the other part is worn out.
- this result indicates that when the Rh content is 0.2% by mass, it is not sufficient to suppress oxidative consumption.
- the noble metal tip 33 and the like are consumed from the first and second discharge surfaces 31 T and 41 T, so that the plug No. 1 has a large consumption amount of 0.32 mm. It is also rated "X" in the evaluation of consumption.
- the Ru content is 8 to 20% by mass, the Ru content is greater than Ni, and the Ru content is greater than Rh, that is, the Ru content is in the above range.
- the sweating phenomenon is effectively suppressed by the fact that the number is large after Ir.
- Graph 1 shown in FIG. 4 shows a test using a noble metal tip 33 having a composition represented by Ir one Rh R-6 Ru-IN i among the examples and comparative examples shown in the table of FIG. This graph shows the relationship between the Rh content and the consumption of plug 100 (Nos. 1 to 9).
- the Rh content in the noble metal tip 33 etc. must be 0.3% by mass or more and 43% by mass or less. It is clear that the following is good.
- the graph 2 shown in FIG. 5 uses the noble metal tip 33 having a composition represented by Ir-8Rh- / 3Ru-INi among the examples and comparative examples shown in the table of FIG. The relationship between the Ru content] 3 and the amount of consumption was shown for the plug 100 (No. 10 to 19) This is a graph.
- the graph 3 shown in FIG. 6 uses the noble metal tip 33 having a composition represented by Ir-8Rh-llRu-yNi among the examples and comparative examples shown in the table of FIG. 9 is a graph showing the relationship between the Ni content ⁇ and the amount of consumption for plug 100 (numbers 12 and 20 to 25).
- the Ni content ⁇ in the noble metal tip 33 or the like is set to 19% by mass or more. It turns out that it is good.
- a Ni content of 0.2% by mass see No. 20
- a Ni content of 0.4% by mass see No. 21
- abnormal consumption did not occur, indicating that the content should be set to 0.4% by mass or more.
- the amount of wear of the noble metal chips 33 and the like in the durability test described above can be suppressed to 0.3 Omm or less, the durability is high, and oxidative wear, abnormal wear, and sweating can be suppressed.
- a main component I r, and 0.3 wt% or more 43 wt% or less of R h 5. 2 wt 0/0 than the 41 wt% or less and Ru of the N i of 0.4 mass 0/0 or 1 9 wt% or less, it can be seen that those containing a is appropriate.
- the noble metal tip 3 3 in order to reduce the consumption of the noble metal tip 33 or the like to 0.15 mm or less (evaluation of “mouth” or more), the noble metal tip 3 3 It can be seen that it is good to set the Rh content ⁇ in the above to 0.5 mass% or more and 36 mass% or less. It is also found that the Ru content] 3 is preferably 36% by mass or less. Here, taking into account the sweating phenomenon as described above, the Ru content j3 should be not less than 5.2% by mass and not more than 36% by mass. It turns out that the following is good.
- the Ni content is 11 mass. It can be seen that it is better to be / 0 or less.
- the Ni content ⁇ is preferably set to 0.4% by weight or more and 11% by weight or less in consideration of abnormal consumption as described above.
- the composition of the noble metal tip 33 etc. should be composed mainly of Ir, with R h of 0.5% to 36% by mass and Ru of 5.2% to 36% by mass. And, 0.4 mass. It can be seen that those containing Ni of not less than / 0 and not more than 11 mass% are suitable.
- Rh content ⁇ is 1.0 mass ° /. It is understood that it is better to set the content to 31% by mass or less. It is also found that the Ru content / 3 is preferably set to 31% by mass or less. Here, considering the sweating phenomenon as described above, it can be seen that the Ru content] 3 should be set to 5.2% by mass or more and 31% by mass or less. Also, the Ni content y is 7 mass. It can be seen that it is better to be / 0 or less. Here, it is understood that the Ni content ⁇ may be set to 0.4% by weight or more and 7% by weight or less in consideration of abnormal consumption as described above.
- the composition of the noble metal tip 33 and the like is mainly composed of Ir and contains 1.0% to 31% by mass of Rh, and 5.2% to 31% by mass of Ru. It is understood that those containing Ni and 0.4% by mass or more and 7% by mass or less are appropriate.
- the Rh content in the noble metal tip 33 and the like is reduced.
- the Ru content] 3 is preferably set to 24% by mass or less.
- the Ni content ⁇ is preferably set to 3.5% by mass or less.
- the Ni content ⁇ is 0.4% by weight or more and 3.5% by mass. It can be seen that it is better to be / 0 or less.
- the composition of the noble metal tip 33 is Ir, whose main component is 6.5 mass. / 0 and more than 2 2 mass% of Rh, 5. and 2 mass% or more 24 wt 0/0 following Ru, those containing, and N i of 0.4 mass% or more 3.5 wt% or less It turns out to be appropriate.
- FIGS. 1-10 photographs and explanatory views of the first noble metal tip 33 of the plug of No. 12 are shown in FIGS.
- the first noble metal tip 33 of the plug of No. 12 has a tip end face 33 T of the first tip (the upper surface in the figure). ) And the corners of the first chip side surface 33S are not rounded, and it can be seen that the spark consumption and oxidation consumption in the durability test are extremely small. Further, the first chip side surface 33S has a substantially cylindrical shape, and no abnormal wear that occurs in an aggressive manner is observed on the first chip side surface 33S. Furthermore, it can be seen that the adhesion of the particulate matter was very slight, and almost no sweating phenomenon occurred.
- the plug 100 in which the first noble metal tip 33 is welded to the center electrode body 32 and the second noble metal tip 43 is welded to the side electrode body 42 is used.
- the entire side electrode 4 can be made of a noble metal having a predetermined composition.
- the plug 100 in which the noble metal tip 33 and the like are provided on both the center electrode main body 32 and the side electrode main body 42 is used.
- the present invention can be applied to a plug provided with a noble metal tip in only one of the two.
- the first noble metal tip 33 and the second noble metal tip 43 are made of the same noble metal.
- the composition of the noble metal tips to be connected may be made different.
- a plug having a form in which the side electrode 4 is located forward (below in FIGS. 1 and 2) of the center electrode 3 is used as the plug 100.
- the present invention can be applied to other types of plugs having different shapes of the center electrode and the side electrodes.
- a so-called creeping discharge type or semi-creeping discharge type plug in which the side surface of the center electrode and the tip surface of the side electrode face each other, specifically, a noble metal member facing the spark discharge gap
- the present invention can be applied to the composition.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Spark Plugs (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04722429A EP1628375B1 (en) | 2003-05-28 | 2004-03-22 | Spark plug |
DE602004027028T DE602004027028D1 (de) | 2003-05-28 | 2004-03-22 | Zündkerze |
JP2005506453A JP4402046B2 (ja) | 2003-05-28 | 2004-03-22 | スパークプラグ |
US10/519,075 US7279827B2 (en) | 2003-05-28 | 2004-03-22 | Spark plug with electrode including precious metal |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003151102 | 2003-05-28 | ||
JP2003-151102 | 2003-05-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004107517A1 true WO2004107517A1 (ja) | 2004-12-09 |
Family
ID=33487207
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/003821 WO2004107517A1 (ja) | 2003-05-28 | 2004-03-22 | スパークプラグ |
Country Status (6)
Country | Link |
---|---|
US (1) | US7279827B2 (ja) |
EP (2) | EP1628375B1 (ja) |
JP (1) | JP4402046B2 (ja) |
CN (1) | CN100470975C (ja) |
DE (1) | DE602004027028D1 (ja) |
WO (1) | WO2004107517A1 (ja) |
Cited By (2)
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WO2010058835A1 (ja) * | 2008-11-21 | 2010-05-27 | 日本特殊陶業株式会社 | 内燃機関用スパークプラグ |
JP2014107128A (ja) * | 2012-11-28 | 2014-06-09 | Ngk Spark Plug Co Ltd | スパークプラグ |
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AU2005258274A1 (en) * | 2004-06-23 | 2006-01-05 | The Feinstein For Medical Research | Method of treating ileus by pharmacological activation of cholinergic receptors |
JP4430119B2 (ja) | 2006-07-25 | 2010-03-10 | Tanakaホールディングス株式会社 | スパークプラグ用の貴金属合金及びその製造加工方法 |
KR100853292B1 (ko) | 2007-01-31 | 2008-08-21 | 주식회사 유라테크 | 점화플러그 |
WO2008093922A1 (en) | 2007-01-31 | 2008-08-07 | Yura Tech Co., Ltd. | Ignition plug |
CN103229372A (zh) | 2010-07-29 | 2013-07-31 | 美国辉门(菲德尔莫古)点火系统有限公司 | 用于与火花塞一起使用的电极材料 |
JP5325201B2 (ja) * | 2010-12-27 | 2013-10-23 | 田中貴金属工業株式会社 | イリジウム含有合金からなる金属線材 |
US8471451B2 (en) * | 2011-01-05 | 2013-06-25 | Federal-Mogul Ignition Company | Ruthenium-based electrode material for a spark plug |
WO2012102994A2 (en) * | 2011-01-27 | 2012-08-02 | Federal-Mogul Ignition Company | Electrode material for a spark plug |
WO2012116062A2 (en) | 2011-02-22 | 2012-08-30 | Federal-Mogul Ignition Company | Electrode material for a spark plug |
WO2013003325A2 (en) | 2011-06-28 | 2013-01-03 | Federal-Mogul Ignition Company | Electrode material for a spark plug |
US10044172B2 (en) | 2012-04-27 | 2018-08-07 | Federal-Mogul Ignition Company | Electrode for spark plug comprising ruthenium-based material |
WO2013177031A1 (en) | 2012-05-22 | 2013-11-28 | Federal-Mogul Ignition Company | Method of making ruthenium-based material for spark plug electrode |
US8979606B2 (en) | 2012-06-26 | 2015-03-17 | Federal-Mogul Ignition Company | Method of manufacturing a ruthenium-based spark plug electrode material into a desired form and a ruthenium-based material for use in a spark plug |
JP5619843B2 (ja) | 2012-10-05 | 2014-11-05 | 日本特殊陶業株式会社 | スパークプラグ |
DE102013210453B4 (de) * | 2013-06-05 | 2018-03-15 | Robert Bosch Gmbh | Zündkerzenelektrode und Zündkerze |
DE102013210456B4 (de) * | 2013-06-05 | 2018-05-30 | Robert Bosch Gmbh | Zündkerze mit sich bildender nickelreicher Schutzschicht |
JP5750490B2 (ja) | 2013-11-08 | 2015-07-22 | 日本特殊陶業株式会社 | スパークプラグ |
JP6010569B2 (ja) * | 2014-02-24 | 2016-10-19 | 日本特殊陶業株式会社 | スパークプラグ |
DE102015115746B4 (de) | 2015-09-17 | 2017-04-27 | Federal-Mogul Ignition Gmbh | Verfahren zum Herstellen einer Zündelektrode für Zündkerzen und damit hergestellte Zündkerze |
EP3389897B1 (de) * | 2015-12-15 | 2020-10-14 | OBE Ohnmacht & Baumgärtner GmbH & Co. KG | Verbundwerkstoff, verfahren zum herstellen eines verbundwerkstoffs und entladungskomponente mit einem solchen verbundwerkstoff |
DE102018101512B4 (de) | 2018-01-24 | 2020-03-19 | Federal-Mogul Ignition Gmbh | Verfahren zum Herstellen einer Elektrodenanordnung, Elektrodenanordnung und Zündkerze |
DE112021001025T5 (de) * | 2020-02-14 | 2022-12-01 | Ngk Spark Plug Co., Ltd. | Edelmetallspitze für Zündkerzen, Elektrode für Zündkerzen, und Zündkerze |
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JPH097733A (ja) | 1995-06-15 | 1997-01-10 | Nippondenso Co Ltd | 内燃機関用スパークプラグ |
EP1231687A2 (en) | 2001-02-13 | 2002-08-14 | Denso Corporation | Spark plug and ignition apparatus using same |
JP2002359050A (ja) | 2001-03-28 | 2002-12-13 | Ngk Spark Plug Co Ltd | スパークプラグ |
JP2002359051A (ja) * | 2001-03-28 | 2002-12-13 | Ngk Spark Plug Co Ltd | スパークプラグ |
JP2003068421A (ja) * | 2001-08-27 | 2003-03-07 | Denso Corp | スパークプラグおよびその製造方法 |
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JP4283347B2 (ja) * | 1997-11-20 | 2009-06-24 | 日本特殊陶業株式会社 | スパークプラグ |
JP3796342B2 (ja) * | 1998-01-19 | 2006-07-12 | 日本特殊陶業株式会社 | スパークプラグ及びその製造方法 |
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DE10015642A1 (de) | 2000-03-29 | 2001-10-18 | Bosch Gmbh Robert | Zündkerze für eine Brennkraftmaschine |
JP4305713B2 (ja) * | 2000-12-04 | 2009-07-29 | 株式会社デンソー | スパークプラグ |
JP3702838B2 (ja) * | 2001-02-08 | 2005-10-05 | 株式会社デンソー | スパークプラグおよびその製造方法 |
WO2002080321A1 (fr) | 2001-03-28 | 2002-10-10 | Ngk Spark Plug Co., Ltd. | Bougie d'allumage |
JP2003142226A (ja) * | 2001-10-31 | 2003-05-16 | Ngk Spark Plug Co Ltd | スパークプラグ |
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JP2003317896A (ja) * | 2002-02-19 | 2003-11-07 | Denso Corp | スパークプラグ |
-
2004
- 2004-03-22 DE DE602004027028T patent/DE602004027028D1/de not_active Expired - Lifetime
- 2004-03-22 EP EP04722429A patent/EP1628375B1/en not_active Expired - Lifetime
- 2004-03-22 CN CNB2004800004064A patent/CN100470975C/zh not_active Expired - Lifetime
- 2004-03-22 JP JP2005506453A patent/JP4402046B2/ja not_active Expired - Lifetime
- 2004-03-22 US US10/519,075 patent/US7279827B2/en active Active
- 2004-03-22 WO PCT/JP2004/003821 patent/WO2004107517A1/ja active Application Filing
- 2004-03-22 EP EP10002463.7A patent/EP2197077B1/en not_active Expired - Lifetime
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JPH097733A (ja) | 1995-06-15 | 1997-01-10 | Nippondenso Co Ltd | 内燃機関用スパークプラグ |
EP1231687A2 (en) | 2001-02-13 | 2002-08-14 | Denso Corporation | Spark plug and ignition apparatus using same |
JP2002359050A (ja) | 2001-03-28 | 2002-12-13 | Ngk Spark Plug Co Ltd | スパークプラグ |
JP2002359051A (ja) * | 2001-03-28 | 2002-12-13 | Ngk Spark Plug Co Ltd | スパークプラグ |
JP2003068421A (ja) * | 2001-08-27 | 2003-03-07 | Denso Corp | スパークプラグおよびその製造方法 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010058835A1 (ja) * | 2008-11-21 | 2010-05-27 | 日本特殊陶業株式会社 | 内燃機関用スパークプラグ |
US8648519B2 (en) | 2008-11-21 | 2014-02-11 | Ngk Spark Plug Co., Ltd. | Spark plug for internal combustion engine |
JP2014107128A (ja) * | 2012-11-28 | 2014-06-09 | Ngk Spark Plug Co Ltd | スパークプラグ |
Also Published As
Publication number | Publication date |
---|---|
JPWO2004107517A1 (ja) | 2006-07-20 |
EP1628375B1 (en) | 2010-05-05 |
DE602004027028D1 (de) | 2010-06-17 |
CN100470975C (zh) | 2009-03-18 |
EP2197077B1 (en) | 2018-01-17 |
CN1698245A (zh) | 2005-11-16 |
EP2197077A3 (en) | 2015-07-15 |
US7279827B2 (en) | 2007-10-09 |
EP1628375A1 (en) | 2006-02-22 |
EP2197077A2 (en) | 2010-06-16 |
US20060043855A1 (en) | 2006-03-02 |
JP4402046B2 (ja) | 2010-01-20 |
EP1628375A4 (en) | 2007-08-01 |
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