JPS63153236A - Electrode material for spark plug - Google Patents
Electrode material for spark plugInfo
- Publication number
- JPS63153236A JPS63153236A JP30508886A JP30508886A JPS63153236A JP S63153236 A JPS63153236 A JP S63153236A JP 30508886 A JP30508886 A JP 30508886A JP 30508886 A JP30508886 A JP 30508886A JP S63153236 A JPS63153236 A JP S63153236A
- Authority
- JP
- Japan
- Prior art keywords
- electrode material
- spark plug
- electrode
- internal combustion
- oxide film
- 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.)
- Pending
Links
- 239000007772 electrode material Substances 0.000 title claims abstract description 11
- 229910052706 scandium Inorganic materials 0.000 claims abstract 3
- 229910052726 zirconium Inorganic materials 0.000 claims abstract 3
- 239000000654 additive Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 8
- 239000000956 alloy Substances 0.000 abstract description 8
- 238000002485 combustion reaction Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 229910052759 nickel Inorganic materials 0.000 abstract description 2
- 229910052791 calcium Inorganic materials 0.000 abstract 2
- 229910052746 lanthanum Inorganic materials 0.000 abstract 2
- 229910052727 yttrium Inorganic materials 0.000 abstract 2
- 229910019589 Cr—Fe Inorganic materials 0.000 abstract 1
- 229910017060 Fe Cr Inorganic materials 0.000 abstract 1
- 229910002544 Fe-Cr Inorganic materials 0.000 abstract 1
- 229910052804 chromium Inorganic materials 0.000 abstract 1
- 238000005098 hot rolling Methods 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 229910052748 manganese Inorganic materials 0.000 abstract 1
- 238000005482 strain hardening Methods 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 229910052761 rare earth metal Inorganic materials 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 150000002910 rare earth metals Chemical class 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000010953 base metal Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910001026 inconel Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000002305 electric material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Landscapes
- Spark Plugs (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、主として内燃機関用点火プラグに用いる耐
久性に優れた電極材料に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates primarily to a highly durable electrode material used in a spark plug for an internal combustion engine.
自動車用エンジン等の内燃機関に用いられる点火プラグ
の電極材料としては、Ｎｉ基合金、具体的にはＮｉにＭ
、ＳＣ，、Ｓ、 、Ｔ、 、／１等を１種又は２種以上
、重量比で１−１０％程度添加した合金が一般的に用い
られている。また、近頃は、高温腐食耐久性の観点から
Ｎｉ基合金の中でも、インコネル系（Ｃ−Ｆ−Ｎｉ）合
金、例えば、ＪＩＳ ＮＣＦ６００などが使用されつ
つある。下表はＮＣＦ６００の代表的成分である。As the electrode material for spark plugs used in internal combustion engines such as automobile engines, Ni-based alloys, specifically Ni and M
, SC, , S, , T, , /1, etc., are generally used in alloys to which one or more types are added in an amount of about 1 to 10% by weight. Furthermore, recently, among Ni-based alloys, Inconel-based (C-F-Ni) alloys, such as JIS NCF600, are being used from the viewpoint of high-temperature corrosion durability. The table below shows typical components of NCF600.
上述した如き従来の電極材料は、耐高温酸化性、経済性
、熱伝導性には優れているが、ガソリンエンジンの燃焼
過程で発生する酸化雰囲気、還元雰囲気の繰り返えし、
さらには、ガソリン・エアー混合ガスの圧縮・燃焼及び
同ガスの排気・吸入による高温状態と冷却状態の繰り返
えしにより、耐高温酸層性に優れたＣ、 、Ｎｉ 、Ｆ
ａの表面酸化物が剥離し、このために、下地金属の消耗
やプラグ部分の欠損が起り、点火プラグのメンテナンス
フリー化、長寿命化が強く要求されだした最近では、そ
のことが大きくクローズアップされて解消すべき重要な
課題となってきた。Conventional electrode materials as described above have excellent high-temperature oxidation resistance, economic efficiency, and thermal conductivity, but they suffer from repeated oxidizing and reducing atmospheres generated during the combustion process of gasoline engines.
Furthermore, C, , Ni, and F, which have excellent high-temperature acid layer resistance, are produced by compressing and combusting a gasoline/air mixture gas, and by exhausting and inhaling the same gas to repeatedly cycle through high-temperature and cooling conditions.
The surface oxide of a is peeled off, which causes the underlying metal to wear out and the plug to break off.This problem has come into the spotlight recently as there has been a strong demand for maintenance-free and long-life spark plugs. This has become an important issue that needs to be resolved.
〔問題点を解決するための手段］
この発明は、上記の問題点を無くすため、ＮＣＦ００の
組成の中に、微量の添加元素（希土類金属）を含める。[Means for Solving the Problems] In order to eliminate the above problems, the present invention includes a trace amount of an additive element (rare earth metal) in the composition of NCF00.
具体的には、重量比でＮｉを７２％以上、Ｃｒを１４〜
１７％、Ｆａを６〜ｌＯ％、Ｓ、を０．５％以下、Ｍ、
を１％以下含むＮ。Specifically, Ni is 72% or more and Cr is 14 to 14% by weight.
17%, Fa 6-1O%, S, 0.5% or less, M,
N containing 1% or less.
−、Ｃ，−Ｆａ合金内に、ＹＳＣ，、Ｚ、 、ｓ、、Ｌ
ａの中から選ばれた元素を１種以上０．０１〜０．３％
の範囲で添加してＮＣＦ６００の性質をガソリン燃焼室
内で発生する酸化、還元及び高温、急冷の繰り返えしに
よっても表面酸化膜の剥離のないものに改質し、内燃機
関用点火プラグに用いても耐久性に富む電極材料を実現
している。-,C,-Fa alloy contains YSC,,Z, ,s,,L
0.01-0.3% of one or more elements selected from a
NCF600 is added in a range of We have created an electrode material that is extremely durable.
Ｙ、Ｚ、 、Ｃ，、Ｓ、 、Ｌａなどの希土類金属は、
微量に含有するだけで優先的に（積極的に）高温下で緻
密かつ微小な酸化物を形成するため、その添加によって
電極材料は酸化性高温状況下では勿論、良好な皮膜を形
成し、かつ、長時間放置しても一定以上に酸化増量が進
まないと云う特性を示すようになる。また、還元雰囲気
になっても酸化膜が全量還元されて金属層に戻ることも
なく、皮膜の増減が極めて少ないと云う特性も付与され
る。従って、電極の下地金属は、常に存在する酸化膜に
覆われて保護され、このために、下地金属の消耗が防止
されて電極の耐久性が長められる。Rare earth metals such as Y, Z, , C, , S, , La,
Even if it is contained in a small amount, it will preferentially (actively) form a dense and minute oxide at high temperatures, so its addition will allow the electrode material to form a good film even under oxidizing high-temperature conditions. However, even if left for a long time, oxidation does not increase beyond a certain level. Further, even in a reducing atmosphere, the oxide film is not completely reduced and returns to a metal layer, and the film has the characteristic that there is very little increase or decrease in the film. Therefore, the base metal of the electrode is protected by being covered with the always present oxide film, which prevents the base metal from being worn out and increases the durability of the electrode.
ここで、上記希土類金属の含有量を０．０１〜０．３重
置％に限定したのは次の理由による。即ち、その含有量
が０．０１重量％以下では改質効果が薄く緻密な酸化膜
が得られない、一方、０．３重量％以上にしても改質効
果は頭打ちとなり、逆に、優先酸化のために酸化膜厚が
過剰に厚くなって剥離し易くなり、かつ放電性能を低下
させる。特に、添加量が０．４重量％を越えると加工硬
化し易くなる傾向もあり、電極材料としては不向きなも
のになる。Here, the reason why the content of the rare earth metal is limited to 0.01 to 0.3% is as follows. That is, if the content is less than 0.01% by weight, the modification effect is weak and a dense oxide film cannot be obtained.On the other hand, if the content is more than 0.3% by weight, the modification effect reaches a ceiling, and conversely, preferential oxidation Therefore, the oxide film becomes excessively thick and easily peels off, and the discharge performance is deteriorated. In particular, if the amount added exceeds 0.4% by weight, it tends to be work hardened, making it unsuitable as an electrode material.
この希土類金属のより好ましい添加量は０．０２〜０゜
１％の範囲である。A more preferable addition amount of this rare earth metal is in the range of 0.02 to 0.1%.
なお、希土類金属の酸化を積極化する目的と、材料の加
工性（プラグ用電極となす際の冷間加工性）を向上させ
る目的から、組成中のＣ成分は可及的に低く抑えること
が肝要である。そのＣの含有量は０．０１重量％以下が
特に好ましいことが判ったが、酸化膜の耐剥離性に関し
ては０．１５％以下でも問題はなく、電極材料としての
使用は充分に可能である。Note that the C component in the composition should be kept as low as possible for the purpose of actively oxidizing the rare earth metal and improving the workability of the material (cold workability when making it into an electrode for a plug). It is essential. It has been found that the C content is particularly preferably 0.01% by weight or less, but there is no problem with the peeling resistance of the oxide film even if it is 0.15% or less, and it is fully possible to use it as an electrode material. .
〔実施例］
次表に示す成分、重量比の金属粉末を配合し、高周波溶
解炉で溶解し、熱間圧延後、成形して電１材料を得た。[Example] Metal powders having the components and weight ratios shown in the following table were blended, melted in a high frequency melting furnace, hot rolled, and then molded to obtain an electric material.
次に、この発明の効果を知るため、その材料を冷間加工
して所定寸法のプラグ電極とし、これを特性評価試験に
供した。Next, in order to find out the effects of this invention, the material was cold-worked into a plug electrode of a predetermined size, and this was subjected to a characteristic evaluation test.
特性評価試験は、大気中で１０００°Ｃに加熱してその
温度を２４時間保持し、次に急冷し、その後７００°Ｃ
に加熱されたＨ２雰囲気下で４時間還元し、放冷する工
程を１サイクルとして、そのサイクルを表に示す回数繰
り返した後の酸化増量と表面酸化物層の剥離状態を外観
検査したものである。Characteristic evaluation tests were conducted by heating to 1000°C in air, holding that temperature for 24 hours, then rapidly cooling, and then heating to 700°C.
One cycle is the process of reducing for 4 hours in an H2 atmosphere heated to , followed by cooling, and the cycle is repeated the number of times shown in the table, after which the oxidation weight increase and the peeling state of the surface oxide layer are visually inspected. .
また、耐火花消耗性は、得られた電極に対してスパーク
を飛ばし、１０００サイクル後の表面状況から判断した
。Further, the spark abrasion resistance was judged from the surface condition after 1000 cycles by blowing sparks on the obtained electrode.
なお、比較のため、従来品と、成分比を本発明品とは若
干変化させたもの（表の比較品）についても同じ試験を
行った。For comparison, the same test was also conducted on a conventional product and a product whose component ratio was slightly different from that of the present invention product (comparative products in the table).
上の表から、従来のインコネル系合金の場合、酸化、還
元の繰り返しによって酸化膜が次第に厚（なるのに対し
、希土類元素を添加すれば、その増厚が効果的に抑制さ
れることが判る。From the table above, it can be seen that in the case of conventional Inconel-based alloys, the oxide film gradually becomes thicker due to repeated oxidation and reduction, but by adding rare earth elements, this increase in thickness can be effectively suppressed. .
また、耐火花消耗性も従来より良い方向に向かうことが
判る。It can also be seen that the spark wear resistance is also better than before.
さらに、成分比の調整次第では（希土属元素の添加量次
第では）、酸化膜の耐剥離性に差が出ることも判る。Furthermore, it can be seen that depending on the adjustment of the component ratio (depending on the amount of rare earth element added), a difference appears in the peeling resistance of the oxide film.
以上述べたように、この発明は、耐高圧酸化性、経済性
、熱伝導性には優れるが、酸化、還元及び高温、急冷が
繰り返される使用条件下では、表面酸化膜が剥離して下
地金属の消耗等が起こると云う従来のＮ Ｆ Ｃ６００
の性質を、組成中に微量の希土類元素を加えることによ
って改質し、酸化増量を抑制すると共に、耐花火消耗性
も向上させたものであるから、ガソリンエンジン等の内
燃機関用点火プラグに採用しても不足の無い耐久性を発
揮し、点火プラグのメンテナンスフリー化と長寿命化に
貢献できると云う効果が得られる。As described above, this invention has excellent high-pressure oxidation resistance, economic efficiency, and thermal conductivity, but under usage conditions where oxidation, reduction, high temperature, and rapid cooling are repeated, the surface oxide film peels off and the underlying metal The conventional NFC600 is said to suffer from wear and tear.
Its properties have been modified by adding a small amount of rare earth elements to its composition, which suppresses oxidation increase and also improves fireworks wear resistance, making it suitable for use in spark plugs for internal combustion engines such as gasoline engines. Even when the spark plug is used, it exhibits perfect durability and contributes to maintenance-free spark plugs and longer lifespans.
Claims (1)
を６〜１０％、Ｓｉを０．５％以下、Ｍｎを１％以下含
むＮｉ−Ｃｒ−Ｆａ合金内に、Ｙ、Ｃｅ、Ｚｒ、Ｓｃ、
Ｌａの中から選ばれた元素を１種以上０．０１〜０．３
％の範囲で添加して成る点火プラグ用電極材料。By weight ratio, Ni is 72% or more, Cr is 14-17%, Fa
Y, Ce, Zr, Sc,
One or more elements selected from La 0.01 to 0.3
An electrode material for spark plugs containing additives in the range of %.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30508886A JPS63153236A (en) | 1986-12-17 | 1986-12-17 | Electrode material for spark plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30508886A JPS63153236A (en) | 1986-12-17 | 1986-12-17 | Electrode material for spark plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63153236A true JPS63153236A (en) | 1988-06-25 |
Family
ID=17940962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30508886A Pending JPS63153236A (en) | 1986-12-17 | 1986-12-17 | Electrode material for spark plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63153236A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01180934A (en) * | 1988-01-14 | 1989-07-18 | Ngk Spark Plug Co Ltd | Electric discharge electrode material for spark plug |
| JPH0234734A (en) * | 1988-07-25 | 1990-02-05 | Mitsubishi Metal Corp | Ni-base alloy for spark plug electrode of internal combustion engine |
| US6852177B2 (en) | 2001-12-21 | 2005-02-08 | Hitachi Metals Ltd. | Ni-based alloy improved in oxidation-resistance, high temperature strength and hot workability |
| JP2007165291A (en) * | 2005-11-16 | 2007-06-28 | Ngk Spark Plug Co Ltd | Spark plug for internal combustion engine |
-
1986
- 1986-12-17 JP JP30508886A patent/JPS63153236A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01180934A (en) * | 1988-01-14 | 1989-07-18 | Ngk Spark Plug Co Ltd | Electric discharge electrode material for spark plug |
| JPH0234734A (en) * | 1988-07-25 | 1990-02-05 | Mitsubishi Metal Corp | Ni-base alloy for spark plug electrode of internal combustion engine |
| JP2587864B2 (en) * | 1988-07-25 | 1997-03-05 | 三菱マテリアル株式会社 | Spark plug electrode material for internal combustion engines |
| US6852177B2 (en) | 2001-12-21 | 2005-02-08 | Hitachi Metals Ltd. | Ni-based alloy improved in oxidation-resistance, high temperature strength and hot workability |
| JP2007165291A (en) * | 2005-11-16 | 2007-06-28 | Ngk Spark Plug Co Ltd | Spark plug for internal combustion engine |
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