JP6546624B2 - スパークプラグ - Google Patents
スパークプラグ Download PDFInfo
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- JP6546624B2 JP6546624B2 JP2017125610A JP2017125610A JP6546624B2 JP 6546624 B2 JP6546624 B2 JP 6546624B2 JP 2017125610 A JP2017125610 A JP 2017125610A JP 2017125610 A JP2017125610 A JP 2017125610A JP 6546624 B2 JP6546624 B2 JP 6546624B2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
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- H—ELECTRICITY
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- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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Description
原料粉末として、平均粒径が0.2〜2.1μmのアルミナ粉末、SiO2粉末、及び、Ba,Ca,Mg,Laの炭酸塩粉末を準備した。これらの粉末を種々の割合で混合した原料粉末と、バインダーとしてのポリビニルアルコールと、溶媒としての水とを混合して種々のスラリーを調製した。
サンプル1〜12における焼結体の組成、即ち各成分の含有率を、ICP発光分光分析により検出した。検出された各成分の酸化物換算の質量の合計を100wt%としたときの質量割合(%)として、各成分の含有率を算出した。
サンプル1〜23,27〜29における焼結体について、STEM−EDS(日立製作所製HD−2000)を用いて組成に関する情報を得た。加速電圧は200kV、電子線のプローブ径は1.0nmとし、EDSによる元素分析、元素マッピング、電子線回折を50,000倍の倍率で行った。
サンプル1〜29における焼結体(絶縁体11)について、軸線O(図1参照)を含む断面を鏡面研磨した後、熱エッチング処理を行った。熱エッチング処理の代わりに化学エッチング処理を行っても良い。SEMを用いて、エッチング処理を行った断面を観察した。SEMの加速電圧は15kV、作動距離は10〜12mmとした。1視野の大きさを200μm×200μmとする矩形領域のSEM画像を、無作為に10視野撮影した。
図6に示す耐電圧試験装置30を用いて、サンプル1〜20,24〜26における有底筒状の試料41(アルミナ基焼結体)の800℃における高温耐電圧試験を行った。図6は耐電圧試験装置30の断面図である。
JIS R1601:2008年に基づいて、室温(5〜35℃)における3点曲げ強さを測定した。
サンプル21〜23における焼結体(絶縁体11)について、形状測定レーザマイクロスコープVK−X110/X100(キーエンス社製)を用いて、絶縁体11の先端部の軸線O方向における算術平均粗さを測定した。
サンプル21〜23における焼結体(絶縁体11)について、材料試験機を用いて、周方向における異なる3方向から絶縁体11(図1参照)の先端部に対して軸線Oと直交する向きの荷重を加え、絶縁体11に破壊が生じたときの荷重(破壊荷重)を測定した。
サンプル24〜26における焼結体に研磨処理を施した後、株式会社リガク製のX線回折装置(型式:Smart Lab)を用いて、X線:CuKα(λ1.54Å)、X線出力:40kV−30mA、スキャンスピード(計数時間):20.0、サンプリング幅:0.02deg、入射スリット:1/2deg、受光スリット(1):15.000mm、受光スリット(2):20.000mmの測定条件でX線回折分析をした。
11 絶縁体
21 結晶粒界
Claims (6)
- アルミナ基焼結体からなる絶縁体を備え、
前記絶縁体は、酸化物換算で、Al成分を90〜98wt%含有するスパークプラグであって、
前記絶縁体は、酸化物換算で、Si成分を1〜5wt%、Mg成分を0.1〜1wt%、Ca成分を2wt%以下、Ba成分を0.3〜6wt%、希土類成分を0.11〜5wt%含有し、
電子線のプローブ径が1nmの走査透過型電子顕微鏡を用いた分析において、厚さ15nm以下の結晶粒界にSi及び希土類元素が検出され、前記結晶粒界におけるアルカリ土類金属は検出限界未満であるスパークプラグ。 - 前記Ba成分の含有率は1〜6wt%である請求項1記載のスパークプラグ。
- 前記Ca成分の含有率は0.3wt以下である請求項1又は2に記載のスパークプラグ。
- 前記Si成分の含有率は1〜2.7wt%である請求項1から3のいずれかに記載のスパークプラグ。
- 前記絶縁体の相対密度は94〜99%であり、前記絶縁体の任意の断面を鏡面研磨した面内に存在する気孔のうち1μm以上の大きさの気孔の割合が1%以下である請求項1から4のいずれかに記載のスパークプラグ。
- 前記絶縁体は、酸化物換算で、Na成分を100〜2000ppm含有する請求項1から5のいずれかに記載のスパークプラグ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017125610A JP6546624B2 (ja) | 2017-06-27 | 2017-06-27 | スパークプラグ |
US16/015,967 US10586627B2 (en) | 2017-06-27 | 2018-06-22 | Spark plug |
DE102018210480.8A DE102018210480B4 (de) | 2017-06-27 | 2018-06-27 | Zündkerze |
CN201810681613.4A CN109149373B (zh) | 2017-06-27 | 2018-06-27 | 火花塞 |
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JP2017125610A JP6546624B2 (ja) | 2017-06-27 | 2017-06-27 | スパークプラグ |
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JP2019009051A JP2019009051A (ja) | 2019-01-17 |
JP6546624B2 true JP6546624B2 (ja) | 2019-07-17 |
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JP (1) | JP6546624B2 (ja) |
CN (1) | CN109149373B (ja) |
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JP6623194B2 (ja) * | 2017-06-27 | 2019-12-18 | 日本特殊陶業株式会社 | スパークプラグ |
US11870221B2 (en) | 2021-09-30 | 2024-01-09 | Federal-Mogul Ignition Llc | Spark plug and methods of manufacturing same |
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EP2259395B1 (en) * | 2008-03-27 | 2020-04-08 | NGK Spark Plug Co., Ltd. | Spark plug |
JP5017298B2 (ja) * | 2009-03-11 | 2012-09-05 | 株式会社日本自動車部品総合研究所 | アルミナ質焼結体とその製造方法及びこれを用いた点火プラグ |
CN102474080B (zh) * | 2009-07-03 | 2013-09-18 | 日本特殊陶业株式会社 | 火花塞及火花塞的制造方法 |
JP4756087B2 (ja) * | 2009-09-25 | 2011-08-24 | 日本特殊陶業株式会社 | スパークプラグ及びスパークプラグの製造方法 |
JP4651732B1 (ja) * | 2009-09-25 | 2011-03-16 | 日本特殊陶業株式会社 | スパークプラグ |
KR101352750B1 (ko) * | 2009-09-25 | 2014-01-16 | 니혼도꾸슈도교 가부시키가이샤 | 스파크 플러그 및 스파크 플러그의 제조방법 |
JP5734160B2 (ja) * | 2011-10-28 | 2015-06-10 | 株式会社日本自動車部品総合研究所 | 絶縁材料及びこれを用いた点火プラグ |
JP5211251B1 (ja) | 2012-02-27 | 2013-06-12 | 日本特殊陶業株式会社 | スパークプラグ |
JP5349670B1 (ja) * | 2012-11-08 | 2013-11-20 | 日本特殊陶業株式会社 | スパークプラグ |
JP2014187004A (ja) * | 2013-02-22 | 2014-10-02 | Ngk Spark Plug Co Ltd | 絶縁体およびスパークプラグ |
JP5775544B2 (ja) * | 2013-05-09 | 2015-09-09 | 日本特殊陶業株式会社 | 点火プラグ用絶縁体及び点火プラグ |
JP6369837B2 (ja) * | 2015-09-24 | 2018-08-08 | 日本特殊陶業株式会社 | スパークプラグ |
JP6440602B2 (ja) * | 2015-09-24 | 2018-12-19 | 日本特殊陶業株式会社 | スパークプラグ |
JP6366555B2 (ja) * | 2015-09-24 | 2018-08-01 | 日本特殊陶業株式会社 | スパークプラグ |
JP6623194B2 (ja) * | 2017-06-27 | 2019-12-18 | 日本特殊陶業株式会社 | スパークプラグ |
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US10586627B2 (en) | 2020-03-10 |
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