JP6299694B2 - スパークプラグ用碍子の製造方法 - Google Patents
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- 239000012212 insulator Substances 0.000 title claims description 31
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 109
- 239000001301 oxygen Substances 0.000 claims description 109
- 229910052760 oxygen Inorganic materials 0.000 claims description 109
- 238000010438 heat treatment Methods 0.000 claims description 62
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 55
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 35
- 238000010304 firing Methods 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 14
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 12
- 229910001882 dioxygen Inorganic materials 0.000 claims description 12
- 238000000465 moulding Methods 0.000 claims description 12
- 238000011144 upstream manufacturing Methods 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 238000010926 purge Methods 0.000 claims description 9
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 5
- 238000005245 sintering Methods 0.000 description 32
- 238000002791 soaking Methods 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 7
- 238000000227 grinding Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000005485 electric heating Methods 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000012671 ceramic insulating material Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
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Description
平均粒径が2μm〜5μmのアルミナ原料粉末と成形助剤からなる成形原料をアルミナ成形体とする成形工程と、
該アルミナ成形体を焼成して、スパークプラグ用碍子となるアルミナ焼結体とする焼成工程と、を有しており、
上記焼成工程において、
上記アルミナ成形体を、加熱手段により700℃〜1600℃に加熱される加熱ゾーンを備えた連続炉に搬入し、該連続炉に酸素ガスを導入して、上記加熱ゾーン内を、酸素濃度が20モル%を上回る高酸素雰囲気に制御する、スパークプラグ用碍子の製造方法にある。
以上のごとく、上記態様によれば、焼結助剤の組成を変えることなく、長時間の焼結を必要とせずに、耐電圧特性を向上させて、高い生産性を実現可能なスパークプラグ用碍子の製造方法を提供することができる。
スパークプラグ用碍子の製造方法に係る実施形態1について、図1〜図3により説明する。図1に示すように、スパークプラグ用碍子1は、アルミナ焼結体12を基材とする所定形状の電気絶縁体であり、成形工程(A)で成形したアルミナ成形体11を、焼成工程(B)で焼成して、アルミナ焼結体12とする。焼成工程(B)には、加熱ゾーンを有する連続炉100を用い、酸素を導入することにより、加熱ゾーン内を、酸素濃度が20モル%を上回る高酸素雰囲気に制御する。得られたアルミナ焼結体12は、研削工程(C)で所定形状に研削されて、スパークプラグ用碍子1となる。以下、各工程の詳細を説明する。
次に、アルミナ焼結体12の焼成工程(B)における酸素濃度を、図4のように変更した時の耐電圧特性への影響を調べた。
まず、成形工程(A)として、アルミナ成形体11を作製した。成形原料として、平均粒径が2μm〜5μmであり、純度99.48%〜99.8%の高純度アルミナ(Al2O3)粉末を原料粉末として用い、成形助剤として適量の有機バインダを添加した成形原料に、水を加えてスラリー状とした。このスラリーを、乾燥、造粒した後、加圧成形することにより、碍子形状のアルミナ成形体11を得た。
11 アルミナ成形体
12 アルミナ焼結体
100 連続炉
401 電気ヒータ(加熱手段)
502、503、504、505 酸素導入口(酸素導入手段)
601、602、603、604 排気口(排気手段)
Z1 加熱ゾーン
Z2 冷却ゾーン
Z3 パージゾーン
Claims (7)
- 平均粒径が2μm〜5μmのアルミナ原料粉末と成形助剤からなる成形原料をアルミナ成形体(11)とする成形工程(A)と、
該アルミナ成形体(11)を焼成して、スパークプラグ用碍子(1)となるアルミナ焼結体(12)とする焼成工程(B)と、を有しており、
上記焼成工程(B)において、
上記アルミナ成形体(11)を、加熱手段(401)により700℃〜1600℃に加熱される加熱ゾーン(Z1)を備えた連続炉(100)に搬入し、該連続炉(100)に酸素ガスを導入して、上記加熱ゾーン(Z1)内を、酸素濃度が20モル%を上回る高酸素雰囲気に制御する、スパークプラグ用碍子の製造方法。 - 上記加熱手段(401)は、上記加熱ゾーン(Z1)内の酸素を消費しない加熱手段である、請求項1に記載のスパークプラグ用碍子の製造方法。
- 上記連続炉(100)は、上記加熱ゾーン(Z1)の下流側に冷却ゾーン(Z2)を備えており、上記加熱ゾーン(Z1)及び上記冷却ゾーン(Z2)に酸素ガスを導入する酸素導入手段(503、504)を設けて、上記酸素導入手段(503、504)からの酸素導入量を調整する、請求項1又は2に記載のスパークプラグ用碍子の製造方法。
- 上記加熱ゾーン(Z1)の上記酸素導入手段(503)の上流側、及び上記冷却ゾーン(Z2)の上記酸素導入手段(504)の下流側に排気手段(602、603)を設けて、上記酸素導入手段(503、504)からの酸素導入量と上記排気手段(602、603)からの排気量を調整する、請求項3に記載のスパークプラグ用碍子の製造方法。
- 上記加熱ゾーン(Z1)の上流側に、酸素導入手段(502)を備える入口部(203)を設け、上記冷却ゾーン(Z2)の下流側に、酸素導入手段(505)を備える出口部(204)を設けて、上記酸素導入手段(502、505)から上記入口部(203)及び上記出口部(204)内に酸素ガスを導入する、請求項3又は4に記載のスパークプラグ用碍子の製造方法。
- 上記入口部(203)の上記酸素導入手段(502)の上流側、及び上記出口部(204)の上記酸素導入手段(505)の下流側に、窒素ガスを導入する窒素導入手段(702、703)と排気手段(601、604)を有するパージゾーン(Z3)を設け、窒素置換した雰囲気ガスに酸素ガスを導入する、請求項5に記載のスパークプラグ用碍子の製造方法。
- 上記加熱ゾーン(Z1)内の酸素分圧を0.04MPa〜1MPaに制御する、請求項1〜6のいずれか1項に記載のスパークプラグ用碍子の製造方法。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015143199A JP6299694B2 (ja) | 2015-07-17 | 2015-07-17 | スパークプラグ用碍子の製造方法 |
CN201680042017.0A CN107851972B (zh) | 2015-07-17 | 2016-07-05 | 火花塞用绝缘子的制造方法 |
DE112016003229.3T DE112016003229B4 (de) | 2015-07-17 | 2016-07-05 | Verfahren zum Herstellen eines Zündkerzenisolators |
PCT/JP2016/069828 WO2017014038A1 (ja) | 2015-07-17 | 2016-07-05 | スパークプラグ用碍子の製造方法 |
US15/745,208 US10933559B2 (en) | 2015-07-17 | 2016-07-05 | Method of producing spark plug insulator |
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FR2201016A5 (ja) * | 1972-09-22 | 1974-04-19 | Automatisme & Technique | |
US4057702A (en) | 1973-10-31 | 1977-11-08 | Automatisme & Technique | Process and plant for the fritting of ceramic products |
JPS62260766A (ja) * | 1986-05-08 | 1987-11-13 | 東レ株式会社 | アルミナ焼結体 |
US5210458A (en) * | 1989-03-06 | 1993-05-11 | Mcdougal John A | Spark plug |
JPH03266386A (ja) * | 1990-03-14 | 1991-11-27 | Mazda Motor Corp | スパークプラグの製造方法 |
JP3088509B2 (ja) | 1991-08-29 | 2000-09-18 | ティーディーケイ株式会社 | セラミック電子部品の製造方法 |
JPH0562657A (ja) | 1991-09-04 | 1993-03-12 | Matsushita Electric Ind Co Ltd | 鉛蓄電池 |
JP3266386B2 (ja) * | 1993-11-09 | 2002-03-18 | 松下電器産業株式会社 | 光学素子成形用金型およびその製造方法 |
JP2000100546A (ja) * | 1998-09-25 | 2000-04-07 | Ngk Spark Plug Co Ltd | スパークプラグ用絶縁体の製造方法 |
JP3617345B2 (ja) | 1998-12-09 | 2005-02-02 | 株式会社村田製作所 | 酸化物系セラミック焼結体の製造方法 |
US7598661B2 (en) * | 2006-06-23 | 2009-10-06 | Federal-Mogul World Wide, Inc | Spark plug |
BRPI0903498A2 (pt) * | 2008-03-27 | 2015-06-23 | Ngk Spark Plug Co | Vela de ignição. |
JP5172016B2 (ja) * | 2009-07-03 | 2013-03-27 | 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 |
WO2011001699A1 (ja) | 2009-07-03 | 2011-01-06 | 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 |
WO2011077619A1 (ja) * | 2009-12-24 | 2011-06-30 | 日本特殊陶業株式会社 | スパークプラグ |
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 |
CN203312623U (zh) * | 2012-09-10 | 2013-11-27 | 株洲湘火炬火花塞有限责任公司 | 一种火花塞复合氧化铝绝缘体 |
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 |
CN103145406A (zh) | 2013-04-07 | 2013-06-12 | 桂林理工大学 | 一种制备耐磨性能优异的氧化铝陶瓷的方法 |
CN104529408A (zh) * | 2014-12-13 | 2015-04-22 | 宁波帝杨电子科技有限公司 | 一种氧化铝基火花塞绝缘材料及其制备方法 |
EP3043135A1 (en) * | 2015-01-08 | 2016-07-13 | Linde Aktiengesellschaft | Apparatus and method for controlling a sintering process |
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US20180272563A1 (en) | 2018-09-27 |
CN107851972A (zh) | 2018-03-27 |
JP2017027703A (ja) | 2017-02-02 |
DE112016003229B4 (de) | 2023-10-12 |
CN107851972B (zh) | 2020-04-28 |
US10933559B2 (en) | 2021-03-02 |
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